@fonix68 Have fun :) I built 3 of them. I don't feel like a genius lol. Note the diodes should be thermally linked to the water somehow, think of it like a heat sink. Diodes will burn if they get too hot. Some people use thermal adhesives, etc. or tabbed diodes, but whatever is most convenient
Inspired by this (and until I get a bunch of high current diodes) I used a broken space heater and used one of the 750w ac heating (resistance) coils connected directly to my 100w solar panel and it got hot! I’m an off grid guy up north with a solar panel on his roof, and I’m gonna set this up right in front of me at the base of the windshield as a free permanent windshield defrost/defog and another one to defrost the chickens waterer. Thanks!! I love community inspiration and freely shared knowledge!! Maybe later hook a 500w wind generator directly up to one of the 750w coils and stuff it in a cold corner of the trailer. Also easy to hook a 12v fan directly to the panel in parallel with the coil (diodes once I get them)
@mikekhouri3016 Glad you found this stuff useful. You understand what this channel is about :) Believe it or not, diodes can also be used to regulate resistance heaters. I am already working on that in my shop. In fact, it's the core reason why I started testing diode strings / chains - I wanted to avoid MPPT circuits in my solar electric heating system. Will make a video about this as soon as I can. Note if you push 100w into a diode chain, the object is to extract the heat. So probably need a heat sink, fan etc. to pull the heat out. Otherwise, diodes will just get hot and burn up. I am using big power diodes with a heat sink and fan, works good enough. I try to keep them below 100C, for best longevity overall. with a proper setup, one can push kilowatts through a set of diodes, as long as they don't overheat.
If you immerse the induction coil into the water too you could recover/make use of the lost heat that is being lost into the air. It could be in an outer chamber also containing water (ex: a slightly larger test tube outside the inner one) so the coil still does not contaminate the food you may be cooking.
Heat pumps move heat from one temperature zone to another which can be more efficient than converting electrical energy into heat through a heating element. Induction heating from solar is not a simple low-cost method, but it works. Thanks for your experiments and ideas. I heat water in a modified electric water directly from solar panels with DC rated circuit breaker, safety disconnect, and thermostat. 2400 watt off-grid.
having good luck with induction hot plate on the camper solar panel. 70 amp 12 volt about 300 watts AC gets 400 degree fry pan.. heats fast. no propane needed!
That looked like a lot of fun. I wonder if it would boil a little faster if you had something covering the top of the test tube (like putting a lid on a pot). I'm going to have to go back into your older videos and watch the one on the diode chain. That sounds very interesting too.
@colin8532 Hope you like the diode experiments - I think they're pretty fascinating. Whoever thought of cooking food with diodes - strange but it works well
Very well done! I actually use a 120v immersion water heater to make my tea. It comes in at about 285 watts, but wh is only about 23, I am using an Oupes Exodus 600w solar bank.
@177airhead5 Thanks... good setup you have for tea :) here's an old video of my solar tea setup - making hibiscus tea: ruclips.net/video/mStAPLu8oOE/видео.html
@@solarpoweredge Thanks for the link! I have never timed how long it takes to get my cup of water hot enough for tea, but I did this last Saturday, about 4 1/2 minutes using an inversion heater.
so in your diode chain video you talked about impedance matching the solar cell. firstly since impedance is essentially resistance of an alternating current how is impedance used in the diode chain DC circuit? also i am more interested in harnessing solar power during the day to store in batteries for heating during the night time. Does this impedance matching with diode chain become lost when running it off batteries instead of directly from solar cell? thanks
@jdscott20101 Hi, diode chains aren't actually useful with a battery. Diodes don't have resistance to current flow. In fact a battery can burn them up instantly. What we have to match is the voltage drop of the diode chain versus the volts-max-power voltage of the solar panel. If the solar panel needs to be at 17 volts for example, then use the proper number of diodes to drop 17v. Diodes aren't ohmic, so they don't have an impedance per se. Instead they drop a certain amount of voltage. But the current is whatever you want to push through. Using the previous example, if the solar panel can push 5 amps, then you get 17v at 5A. If the sun goes behind the clouds, the voltage will swing a little, but the current will down significantly - thus regulating at about 17v. Oddly, this is mimicking the behavior of an MPPT charge controller under changing solar conditions - but without smart electronic circuitry. To be clear, a resistance heating element (nichrome for example) simply cannot regulate. It is a linear relationship between resistance (impedance), voltage and current. But diodes don't change their voltage drop much at all. Their current on the other hand, can adapt to whatever the solar panel can supply at each moment. While maintaining close to the volts-max-power range. This makes them surprisingly useful for direct PV DC heating applications. Hope this makes sense, any questions please let me know
I look at power the same way I view honey bees. Ever seen a 500 pound honey bee? Me neither, but I've seen thousands of little bitty honey bees all working towards the same goal. I build wind turbines. Each one has three 18 inch Coroflute plastic blades, each sitting on a 6 inch offset, making the radius of my swept area 24". They're small, but I have lots of them - all pumping air, 6 squirts per revolution using diaphragm pumps - like little individual honey bees. I store energy as compressed air and build small air engines to use the air to do work. My air "battery" holds 2,000 gallons of air @ from 40 to 80 psig using an adjustable dump valve. If I were using electricity from PV sources, like you are, I'd look into some way to use several small applications all working towards a common goal. Edut: I also use PV panels to run tiny compressors, but one revolution of a windmill compressor does the same amount of pumping as an electric-driven gear box & pump does in about 4 minutes. Hey, I like to tinker.😂 Just a thought.
@WhatDadIsUpTo Good point on the bees. It all adds up. I am slowly gathering parts for a compressed air setup. If I was a millionaire, I'd just go straight to the industrial supply company and get the biggest air setup they had
@@WhatDadIsUpTo sounds great what you have going on... But please be careful with air tanks, I hope yours are new, there are quite a few videos showing how those handyman air compressors can explode! Really scary stuff! Apparently they sound like a bomb going off and have no trouble blowing windows and doors out! They should be mounted somewhere out of the way with a tap to release the pressure from a remote location, and for those that plug into the wall, put in a remote location switch away from the compressor! From what I've seen, there's no rhyme or reason why they explode, I have seen some really old powered compressors being cut open expecting to find a lot of rust and thinning of the walls but not the case.... Yeah I don't know.... But just be careful is all I'm saying.... I haven't put in any research into compressed air storage... Maybe because I have seen too many videos and actual leaking LPG gas cylinders from forklifts.... I will definitely keep it mind, I have too much going on with current experiments to dive into a new field....
How about as an atmospheric water collector for dry areas? If used like a propane fridge it should quite easy to use the heat as a cooler on very low power as a system support. Never need to water the garden again!
Instead of insulating the induction coil, why not put the induction coil into something that will absorb and trap the heat, then use that heat to further heat the water? The most simple solution that comes to mind is to, put the coil into water, then drop the test tube in the coil, the water in the tube is still isolated from the water used for cooling but the water from the coil will trap the coil heat and further heat the water in the tube.
Nice video! The power required to boil water is determined by the heat loss, so with perfect insulation (which isn't practically possible) the power input would just dictate how fast a given amount of water would boil, and any amount of power would make water boil, in theory. Have you tried using high temperature peltier modules for boiling water? They're technically better at heating than cooling as the power they use turns into heat. And when used for heating it should be possible to increase efficiency by stacking them, as the efficiency improves the smaller temperature difference they have to create, and the heat generated by their own power consumption adds to the overall heating. Most cheap peltier modules aren't designed to tolerate more than 70 °C, so for long term use any stage that gets hotter than that should be modules that are designed for high temperatures.
@fishyerik Good info, ty. I am testing all aspects of peltiers, including thermoelectric power generation and heating. It's a huge task, hope to make more video soon
Another idea: I live in a cold area and loose a lot of batteries due to freezing if I leave my trailer when it’s -44’C.. But, with an apx 14v Chain of diodes in series with a resistance heater cable (or not, maybe just diodes). At apx 13.3v branch off to charge the batteries. The heater cable (or diodes) lies between two insulated batteries which become thermal Mass….. Imma get more batteries again!! The panel charges up the batts and when they are full the diodes take it all. But I’m stoned and might. Be missing a detail…
@mikekhouri3016 FYI diodes can burn out when connected to batteries. Diodes have no resistance to current. They'll take whatever gets pushed through. Best to use a current-limited source to power them (solar panel). Otherwise, with direct connection to batteries a normal resistance heating element is probably a better and safer choice.
good stuff... thanks for the brain seed...... diode chain you say... I'd never thought about using them as heating elements.... I'm gonna haveta ruminate on that one
This is cool. "The edge of feasibility" is right up my alley. I was surprised you put the insulation between the coil and the test tube. Why not around both of them to trap in all the heat? I also think a cork (with a vent hole) plugging the end of the test tube would conserve heat and get things boiling faster. Finally, I don't see any problem with putting the induction coil right in the water since it has an enamel coating--or do you think that would mess with the inductive properties? Anyway, this is all just food for thought! Great stuff!
@StuffBudDuz Basically I did not want to further heat the coil, but I am sure there is plenty of heat there to be captured if I wrapped the insulation around it... good thinking!
@solarpoweredge i believe your right. With all of the experimentation, my thoughts not only go to it's success but longterm viability and reliability of the tech.
@cjdelphi Direct solar electric diode chains are more efficient than standard resistance heating elements or induction, but all 3 techniques bring different advantages to the table. Another way to look at it, we have induction cooktops and microwave ovens - both waste power, but are very capable and unique systems with different pros vs. cons
I was thinking of this for pool heater, but then saw magnet induction. Get your panel to spin the wheel of magnets under copper pipe to induce heat. I would love to see your results to that.
There's plenty of other videos that have already done this, but by all means.... It should be tried! Everyone else is doing it differently.... Someone is bound to take it to the next level...
@@solarpoweredge love the experiments by the way . I’m also doing some myself with solar panels and other methods trying to recover energy at a small scale , so this is right up my alley 😁👌
@swrekcfest Glad you like this stuff, I'm grateful for positive feedback. Hopefully will catch more projects on camera in the coming months, I'll keep chipping away at it :) :D
Wonder if thermally wrapping around the coil would be better. As that would make any heat losses in the coil contribute to the overall heating. (Ok, that is basically resistive heating). Though there might be overall losses when the whole testtube/coil assy gets up to 100degC and energy starts to leak out along the copper wires running from the coil. But as an overall efficiency, this system is never going to be as good as a straight resistive heater.
@gonzo_the_great1675 The top suggestion so far has been to wrap the coil! the main reasons I didn't are more resistance caused by higher temperature and I felt the enamel coating on the wire was questionable. I usually base my appliances on resistance or diode string heating, this experiment was prompted by several requests to play around with induction. While not as electrically efficient, induction does have very interesting applications and advantages. I learned a lot from this experiment.
I once tried boiling water with a magnifying lens (fresnel). It was only a capful of water. It totally failed. Then I dropped in a small piece of charcoal from my aquarium. When I hit it with concentrated solar power it got nice and hot to boil away the water. I'm not sure which method is more efficient. 🤔
@SciHeartJourney A piece of iron should be much better for induction, however it's also worth pointing out the solar panel could not push any harder than 10w no matter what metal is used. But it's interesting to test this kind of stuff and see what happens
if I saw correctly only water is inside, but if you put some chunk of metal (small cylinder) inside that is solid it will quickly create Eddy currents and water should boil faster, have you tried it ?
@@solarpoweredge I think what he meant was to place a metallic ring like a piece of pipe inside the test tube, the eddie currents should be able to get it hotter faster.... If I haven't misunderstood.... If anything, any metal object placed within the induction coil, if it performs better, it will draw more current.... You can see in the video when the test tube is lifted out of the coil, the current drops! It's kinda awesome how it can feel that something metal is getting closer to its coil.... I'm wondering how many watts is going to be needed to bring two cups of water to 90°c and keep it there..... I have a cordless Kettle from Amazon, it's only rated for 800W (a far cry from the 2200w models we normally have here in Australia), but I had a 3kw inverter and needed a kettle that didn't need so much power regardless of how long it takes to boil water, so I got this thing from Amazon, its a glass kettle with a metal plate, the base station has many options! Including the ability to run at different power levels... Has a temperature display! And when it gets to 90°c, it drops off the power level, once it gets 100°c it goes into hold at 100°c mode for 4 hours! Not a bad kettle, looks nice and works surprisingly good.... The glass doesn't like to hold onto its heat! Anything at 4 inches distance will feel warm... Even though it does this pwm thing, it still pulls a few hundred watts for two cups of water! I will be working on an induction kettle.... One that I can put more water in and leave it running at low power (with a temperature controller of course for safety) so that I have hot water ready for coffee at any point in time, we have available a separate hot water tap which can be installed in the kitchen sink and have coffee water ready 24/7 but they are resistive heated and could possibly use a lot of energy than I'm prepared to give for such a luxury..... Yet LoL 😂. Maybe induction can be better at it? I will find out....
@PeterMilanovski I see, I should find a solid metal ring or pipe that fits in a test tube. That kettle base sounds nice. Most have no settings or control. I have no idea how much power to hit 90c but you are headed in the right direction!
I have two of those induction circuits, I wanted to test if I could heat water going through a copper pipe, I got up to 6v on my lab power supply which wasn't quite enough power to heat running water... There was about 60W going in and I wanted to take it to it's maximum of 12v but I noticed that the induction coil was already quite hot at 6v and it dawned on me why all the coils in the videos that I have watched (and I have seen a lot of videos) were black! I wasn't expecting a huge difference in temperature but was hoping for at least 2°c difference which would take a considerable amount of time to heat water in a large tank but I would be happy with that result... I have ordered and received new induction coils made of copper pipe which I plan to route the water through first and then pass through the pipe through the coil to absorb the coil heat and get some more efficiency out of the system instead of letting the heat from the coil evaporate.... Even if it can't heat a 100L boiler tank of water, if I set up the system in series before the main boiler tank, pre warmed water will take less time to heat to 60°c than the current situation of cold water going straight in. I already have two boilers in series, the original gas unit and the new heat pump boiler which is doing all the work since it was installed, the original gas unit gets its water already heated and just sits there waiting for the temperature to drop, it's kinda like a backup.... That induction circuit is good for 120W.... I'm interested in how much water can it heat in between hot water usage (showers, dishwashing). The heat pump boiler runs for 2.5hrs after a long shower, if this kit can reduce the run time by even half an hour, then I'm happy! Might even consider hydronic heating and going up to a 600W induction circuit.... It can build up hot water when I'm not home or overnight if I'm not using it so it doesn't need to be fast, you won't need a huge battery to keep it running overnight.... I have yet to test the new coils, I also received new water pumps but one wasn't glued together properly and has a leak, I'm in the process of getting some glue to fix it before I put together a new test circuit.... Hopefully this time I can ramp up the voltage to 12v... I also got two inline flow metre with built in temperature sensor... So I can see what sort of temperature difference I will be able to get... If not quite there, I have a second induction circuit for twice the power.... I also need to invest in another lab power supply, I need to control the speed of the water pumps and control the induction circuit independently... If the water is running to fast, I might not be able to see a difference in temperature... I have a spare 12V SMPS that I can use, maybe I might have to manually switch the SMPS on and off to move the water a bit at a time? Don't know yet, I'm always thinking and looking ahead trying to preempt anything that I can foresee taking place..... Actually, I have plenty DC to DC converters.... I will use one with the SMPS! Ahhh! Excellent, thank you for that! And just before I go digging out a suitable converter, I wanted to ask for your opinion about the series diode heater you made, is the diode setup more efficient than resistive ie nichrome wire? Like which one do you think could heat and equal amount of water faster? If you put in a bit more power into that induction circuit, that water in the test tube would have boiled so much faster, I believe that there are these things called magnetic stirrers, used in chemistry.... They are wrapped in plastic and could possibly be able to withstand 100°c (not sure at what temperature water boils in freedom units LoL). And I'm not sure if the actual magnet is the stirrers on in the base of the stirring contraption.... It probably has a name for which I haven't had the need to know yet LoL. You would prefer to have something in the water other than metal... Although stainless steel might be okay.... There is a flat pancake induction coil that I also plan on getting, I have had a good flat bottom stove top kettle for some time now waiting to be used in an induction circuit... Ohhhh I just remembered, the kettle is stainless steel and apparently doesn't work with induction circuits..... Hmmm need to find a new kettle, perhaps with a copper or aluminium base..... Actually, was that just a steal bolt in the test tube? It looked shiny like stainless steel..... I would be very interested to know, going to re-watch the video to see if you mentioned it.... Anyway, great video, as always to short! I don't mind seeing stuff being put together and listening to whatever you have to say along the way.... Sometimes it's educational and others can be funny.... Either way, keep up the great work! See you in the next video..
@PeterMilanovski Those experiments you're doing sound very interesting, keep up the good work :) I figured a lot of power would be wasted in this circuit, but just had to try it. Sure enough... coil gets pretty hot. Who knows how much power is wasted. But that's OK I love the idea of heating a piece of metal with no wires going to it! Matched diode strings, *****when driven by a solar panel***** are significantly more efficient than standard resistance heating elements. The resistance element is linear, diodes are exponential/logarithmic. I made a few videos here but hope to expand further on it: ruclips.net/p/PL8a6nRTNyF9PK7SExvQKNhN0t3RUP9pT7 There are no guarantees, but I have had some success using stainless pots on induction cooktops. The bolt is stainless steel - the idea being it cannot corrode or hopefully impart harmful substances into the clean water. Obviously other metals are better for induction, but they would probably rust too... Due to the high pressure to keep people watching, I tend to cut videos short and move along quickly. This has definitely ruined a lot of my work. If the channel ever gets to 100k (how many decades will that take?), I'll slow down and make longer more detailed videos with explanations, stats, spec sheets, etc. That's truly what I always wanted to create :)
@@solarpoweredge Hey! Thanks for the info! Okay, stainless steel somewhat works and now my induction heated stainless steel kettle idea is back on the drawing board! Thank you! I have already seen the video's with the diodes, it was the first time I was thinking how come I have never seen this before? A brilliant idea! Einstein level of intelligence right there! Possibly beyond Einstein..... He couldn't figure out what gravity is.... Anyway, you might have mentioned that the diodes were more efficient than going with resistive solutions but I think that I was to impressed that I may have missed that bit of information.... I'm currently looking for a cheap avenue for diodes in TO220 packages because they have mounting tabs and I can screw them to a heatsink for a bit more surface area and better temperature transfer! Not much luck with eBay and AliExpress, most parts on there are probably counterfeit, so I'm looking at the major electronic components suppliers for something that is quality and able to do the job.... I feel like I have a lot going on and I really need to pick something and dedicate as much time as possible! I need to finish at least one project! Could really use a boost in morale from a win ...
@PeterMilanovski Welcome :D those TO220 diodes should be great, easy to screw onto a heat sink. The axial ones are tedious to work with. Usually requiring some kind of thermal cement to attach. I know what you mean... there are 10,000 projects and only a single human (or in my case probably 1/4th) to do them. So I try to focus on no more than 2-3 things at one time. Right now I'm building a small peltier fridge prototype using some promising new ideas, it's taken months to get there :)
@@solarpoweredge I'm also in the process of doing Peltier devices, looking into diodes, the weather is slowly getting better here in Melbourne so I will be up on the roof installing panels to take advantage of the afternoon sun.... I'm also working on an idea that I can't really talk about, but if it works, it will break the second law of thermodynamics.... I have heard too many people say that it can't be done but I'm going to try something different that I haven't seen anyone else do, I have built it up in my mind and have seen it working so I'm 99.9% sure that it could work... Fingers crossed that it does... And if it works, I should be able to upscale it to provide me with all the energy I need.... But until then, it's going to be a secret... But in the meantime I have to develop an efficient solar powered personal space heater because the wife prefers to have hot air blowing directly at her even though the house has a gas central heating unit which runs day and night... Something that I really want to get away from... Which is why I'm looking at every different way to heat! To220 diodes mounted on aluminium slats with a fan from behind like a traditional fan heater might work.... It's something that I want to try... I have also thought about induction for space heating and even Peltier devices for heating which should be really good but I just need to work out how to send the cold side outside! It's a working progress.... When I get stuck on one idea I move on to the next.... It is what it is and we do what we must! It's the people like you and me who work in their garage that eventually end up turning into Apple or Hewlett Packard.... Started in a garage and had to move to a bigger garage and so on...
@PeterMilanovski If they say it can't be done, I'm all for working on it! That's how things get invented... thermodynamics is just a model, a very useful one. I am sure there are phenomenon that operate outside its boundaries...
Why did you put insulation over the test tube? I agree you need insulation, but on the outside of the coils, to prevent loss to the air. If anything, you should try to increase conduction between the coils and test tube.
@@IragmanI In theory, you are correct, but the coil also heats up quite a bit due to the resistance of the wire. It might be worth while to try to capture that heat as well.
@@Guishan_Lingyou definitely! I replaced my coil with copper pipe so that I can run water through it, this way I can preheat the water before it goes through the main pipe to be heated via the coil.... That solid copper coil wire will turn black from how hot it gets! I touched the coil while at 6v and thought wow! So much heat going to waste, I need to get it in circuit and absorb it into the water that I'm trying to heat anyway! There's a lot of other videos that talk about induction heaters but not many of them mention that the coil also gets hot! You can tell when someone post's comments about something and hasn't actually played around with it.... You really need more than just book's.... Get a couple of these cheap things and blow one up so that you will know what it can't do! Besides, it's a lot of fun....
I was looking into getting a buck converter to charge my Ebike battery with solar. I tested the posibilties out witha small solar panel from my boat battery maintainer. it only puts out about 23 volts at peak. but it will charge my power tool 20volt batteries as is, just wont get to 100% charge.. It takes all day, at least thats how long Ii waIted before I checked the state of charge, then I plugged it into the regular tool charger, and it literally took 15 minutes to finish to full charge, so it was very close to full.
@billk9628 Cool! Only a guess but there is possibly not much current flowing once the battery hits 21V, which certainly makes charging a bit safer. Btw it's worth checking whether this charging method activate the BMS/balance circuits on the power tool battery. I ran into that issue with my Ryobi 18v power tool batteries, which is why I use a modified OEM charger with the solar panel. Otherwise, some of the solar panels I use (VOC 22-23v or so) could damage my Ryobi batteries.
It's all about surface area when it comes to induction, had the bolt in the test tube been smaller, all the induction energy would be going into something with a smaller surface area which is more difficult to transfer it's heat to the water and will therefore get hotter, in turn it will then be transferring it's hotter heat to the water effectively getting it to boil sooner.... The more mass, the more induction power needed to be useful! That's why you need at least 240V that's capable of plenty of current for an induction range (or stove)... Posts and pans have a lot of surface area and plenty of mass! It would take too long to cook anything with less power, though there's plenty applications for low power induction heaters.... If it snows where you are, and you use an AC heat pump for heating your house, 20 - 60W worth of induction power to a coil wrapped around one of the aluminium pipes going to the outside evaporator/condenser might just be enough to stop it freezing up and causing the AC unit to go into defrosting.... At 60W power consumption, you won't need a huge solar panel plus battery to keep it running day and night.... You will have to figure out how to get it to turn on and off automatically..... That's the challenge... I would probably use an off the shelf temperature controller that will turn on the induction circuit when a hot temperature is reached and measured on the inside of the house where you want the heat to be on a really cold day.... If the AC unit is running, the controller will detect the heat inside and fire up the induction circuit outside to prevent it from icing up! There! Simples! Might be a bit how ya doin, but I see no reason why it wouldn't work!
I'm almost sure, that your "screw" is not ideal induction power receiver, not all kinds of steel work equal. To bring 100 mililters of water from 25C to 100c you need about 9Wh of energy (if it is fully isolated), so with 10 W it should take about 1 hour.
@AK-vx4dy Was a bit curious to try that type of metal. Last test it took less than an hour to boil. The footage is a bit random, as it took several weeks to get all this done and recorded - lots of interruptions
Why would you insulate BETWEEN the glass test tube and the induction coil? I am not grouching, and like the work. You want THERMAL CONDUCTION there, no insulation and preferably a metallic tube. Put your insulation on the OUTSIDE of the coil to contain heat losses to the ambient air. Same experiment will do better I think. I saw where you boiled the egg in the 12v DC cup. It was probably dual wall, maybe vacuum insulated. GOOD. No better thermal insulator than vacuum. A dbl wall VACUUM insulated vessel like one of the gigantic coffee cups, with the coil in the skinny part at the bottom might be a good try THERMALLY with the cool stuff you are doing ELECTRICALLY. Also if you double-coil your induction loop, winding TWO strands instead of one, then both +/- conductor ends come out the top side by side and its easer to immerse in your vacuum cup, instead of having ONE conductor run up the side from the bottom. Keep it up with the induction because I think those can be made more efficient than other stuff.
@mrwayneright Thanks for the feedback... In my mind, I was just not interested in further heating the coil by wrapping it in insulation. Maybe will try that in a future experiment. Obviously quite a lot of heat is being wasted - that's worth improving
A simpler way to get magnetic induction heating is to run an electric motor spinning a disc with.alternating N S magnets glued. To disk. Only need enough power to run motor and alternating magnetic fields would do the heating
Glow plugs for diesel trucks are very good at boiling water on very small amounts of power.
@SolarSeeker45 I really have to try that
You are a genius! I will also build the egg cooker.
@fonix68 Have fun :) I built 3 of them. I don't feel like a genius lol. Note the diodes should be thermally linked to the water somehow, think of it like a heat sink. Diodes will burn if they get too hot. Some people use thermal adhesives, etc. or tabbed diodes, but whatever is most convenient
Inspired by this (and until I get a bunch of high current diodes) I used a broken space heater and used one of the 750w ac heating (resistance) coils connected directly to my 100w solar panel and it got hot! I’m an off grid guy up north with a solar panel on his roof, and I’m gonna set this up right in front of me at the base of the windshield as a free permanent windshield defrost/defog and another one to defrost the chickens waterer.
Thanks!! I love community inspiration and freely shared knowledge!!
Maybe later hook a 500w wind generator directly up to one of the 750w coils and stuff it in a cold corner of the trailer. Also easy to hook a 12v fan directly to the panel in parallel with the coil (diodes once I get them)
@mikekhouri3016 Glad you found this stuff useful. You understand what this channel is about :)
Believe it or not, diodes can also be used to regulate resistance heaters. I am already working on that in my shop. In fact, it's the core reason why I started testing diode strings / chains - I wanted to avoid MPPT circuits in my solar electric heating system. Will make a video about this as soon as I can.
Note if you push 100w into a diode chain, the object is to extract the heat. So probably need a heat sink, fan etc. to pull the heat out. Otherwise, diodes will just get hot and burn up. I am using big power diodes with a heat sink and fan, works good enough. I try to keep them below 100C, for best longevity overall. with a proper setup, one can push kilowatts through a set of diodes, as long as they don't overheat.
If you immerse the induction coil into the water too you could recover/make use of the lost heat that is being lost into the air. It could be in an outer chamber also containing water (ex: a slightly larger test tube outside the inner one) so the coil still does not contaminate the food you may be cooking.
@dans381 That's a good idea, the coil gets pretty hot
I like the MMPPT.... Manual max power point tracking, but adjusting the converter.
@gonzo_the_great1675 Yes pretty neat... could also call it "human" MPPT
Heat pumps move heat from one temperature zone to another which can be more efficient than converting electrical energy into heat through a heating element. Induction heating from solar is not a simple low-cost method, but it works. Thanks for your experiments and ideas.
I heat water in a modified electric water directly from solar panels with DC rated circuit breaker, safety disconnect, and thermostat. 2400 watt off-grid.
@sagecoach Solar electric hot water is awesome
having good luck with induction hot plate on the camper solar panel. 70 amp 12 volt about 300 watts AC gets 400 degree fry pan.. heats fast. no propane needed!
@solarforfuture Nice! Some months back, I bought a tiny 300w induction plate out of curiosity. It worked extremely well and makes good coffee....
great video Sir!
@ehvway Thank you very much Sir, I appreciate the positive feedback!! :)
That looked like a lot of fun. I wonder if it would boil a little faster if you had something covering the top of the test tube (like putting a lid on a pot). I'm going to have to go back into your older videos and watch the one on the diode chain. That sounds very interesting too.
@colin8532 Pretty cool setup for tinkering :) I did try covering with a cork but didn't record that part
@colin8532 Hope you like the diode experiments - I think they're pretty fascinating. Whoever thought of cooking food with diodes - strange but it works well
@@solarpoweredge Pew!
@pyrojason Worth pointing out, the diodes are never in contact with the food at any time :)
@@solarpoweredge
I'm vapourising weed with an induction coil watching your video :)
Very well done! I actually use a 120v immersion water heater to make my tea. It comes in at about 285 watts, but wh is only about 23, I am using an Oupes Exodus 600w solar bank.
@177airhead5 Thanks... good setup you have for tea :) here's an old video of my solar tea setup - making hibiscus tea:
ruclips.net/video/mStAPLu8oOE/видео.html
@@solarpoweredge Thanks for the link! I have never timed how long it takes to get my cup of water hot enough for tea, but I did this last Saturday, about 4 1/2 minutes using an inversion heater.
@177airhead5 No problem :) wow that's pretty fast
Good job, interesting experiment.
@evil17 Thank you :) 👍
so in your diode chain video you talked about impedance matching the solar cell. firstly since impedance is essentially resistance of an alternating current how is impedance used in the diode chain DC circuit? also i am more interested in harnessing solar power during the day to store in batteries for heating during the night time. Does this impedance matching with diode chain become lost when running it off batteries instead of directly from solar cell? thanks
@jdscott20101 Hi, diode chains aren't actually useful with a battery. Diodes don't have resistance to current flow. In fact a battery can burn them up instantly. What we have to match is the voltage drop of the diode chain versus the volts-max-power voltage of the solar panel. If the solar panel needs to be at 17 volts for example, then use the proper number of diodes to drop 17v.
Diodes aren't ohmic, so they don't have an impedance per se. Instead they drop a certain amount of voltage. But the current is whatever you want to push through. Using the previous example, if the solar panel can push 5 amps, then you get 17v at 5A. If the sun goes behind the clouds, the voltage will swing a little, but the current will down significantly - thus regulating at about 17v. Oddly, this is mimicking the behavior of an MPPT charge controller under changing solar conditions - but without smart electronic circuitry.
To be clear, a resistance heating element (nichrome for example) simply cannot regulate. It is a linear relationship between resistance (impedance), voltage and current. But diodes don't change their voltage drop much at all. Their current on the other hand, can adapt to whatever the solar panel can supply at each moment. While maintaining close to the volts-max-power range. This makes them surprisingly useful for direct PV DC heating applications.
Hope this makes sense, any questions please let me know
This channel rocks!
@djisolated4968 Thank you!!! :) :D 👍
I look at power the same way I view honey bees.
Ever seen a 500 pound honey bee?
Me neither, but I've seen thousands of little bitty honey bees all working towards the same goal.
I build wind turbines. Each one has three 18 inch Coroflute plastic blades, each sitting on a 6 inch offset, making the radius of my swept area 24".
They're small, but I have lots of them - all pumping air, 6 squirts per revolution using diaphragm pumps - like little individual honey bees.
I store energy as compressed air and build small air engines to use the air to do work.
My air "battery" holds 2,000 gallons of air @ from 40 to 80 psig using an adjustable dump valve.
If I were using electricity from PV sources, like you are, I'd look into some way to use several small applications all working towards a common goal.
Edut: I also use PV panels to run tiny compressors, but one revolution of a windmill compressor does the same amount of pumping as an electric-driven gear box & pump does in about 4 minutes. Hey, I like to tinker.😂
Just a thought.
@WhatDadIsUpTo Good point on the bees. It all adds up. I am slowly gathering parts for a compressed air setup. If I was a millionaire, I'd just go straight to the industrial supply company and get the biggest air setup they had
@@solarpoweredge
Baby steps . . .
@@WhatDadIsUpTo sounds great what you have going on... But please be careful with air tanks, I hope yours are new, there are quite a few videos showing how those handyman air compressors can explode! Really scary stuff! Apparently they sound like a bomb going off and have no trouble blowing windows and doors out!
They should be mounted somewhere out of the way with a tap to release the pressure from a remote location, and for those that plug into the wall, put in a remote location switch away from the compressor!
From what I've seen, there's no rhyme or reason why they explode, I have seen some really old powered compressors being cut open expecting to find a lot of rust and thinning of the walls but not the case.... Yeah I don't know.... But just be careful is all I'm saying....
I haven't put in any research into compressed air storage... Maybe because I have seen too many videos and actual leaking LPG gas cylinders from forklifts.... I will definitely keep it mind, I have too much going on with current experiments to dive into a new field....
Did you post a video?
just discovered your channel! amazing! I will now proceed to watch all your videos.
@dominictarrsailing I am thankful you found it :) hope the videos are useful :D
How about as an atmospheric water collector for dry areas?
If used like a propane fridge it should quite easy to use the heat as a cooler on very low power as a system support. Never need to water the garden again!
@mikekhouri3016 The sky is the limit! Good ideas!
Instead of insulating the induction coil, why not put the induction coil into something that will absorb and trap the heat, then use that heat to further heat the water?
The most simple solution that comes to mind is to, put the coil into water, then drop the test tube in the coil, the water in the tube is still isolated from the water used for cooling but the water from the coil will trap the coil heat and further heat the water in the tube.
@xxpr0nag3xx92 Good idea to extract heat from the coil. It was getting too hot to touch, lots of wasted power
Always good information. Thanks
@alhumble8175 Welcome!! :)
Great video, great topic.
@create54321 Thank you :) 👍
copper pipe would be more effective in relation to induction, or a could be inside test tube, great video, like it..
@aidenjohns8248 Ty! Good thinking, there are lots of ways to improve efficiency
Nice video! The power required to boil water is determined by the heat loss, so with perfect insulation (which isn't practically possible) the power input would just dictate how fast a given amount of water would boil, and any amount of power would make water boil, in theory.
Have you tried using high temperature peltier modules for boiling water? They're technically better at heating than cooling as the power they use turns into heat. And when used for heating it should be possible to increase efficiency by stacking them, as the efficiency improves the smaller temperature difference they have to create, and the heat generated by their own power consumption adds to the overall heating. Most cheap peltier modules aren't designed to tolerate more than 70 °C, so for long term use any stage that gets hotter than that should be modules that are designed for high temperatures.
@fishyerik Good info, ty. I am testing all aspects of peltiers, including thermoelectric power generation and heating. It's a huge task, hope to make more video soon
Another idea: I live in a cold area and loose a lot of batteries due to freezing if I leave my trailer when it’s -44’C..
But, with an apx 14v Chain of diodes in series with a resistance heater cable (or not, maybe just diodes). At apx 13.3v branch off to charge the batteries. The heater cable (or diodes) lies between two insulated batteries which become thermal
Mass…..
Imma get more batteries again!!
The panel charges up the batts and when they are full the diodes take it all.
But I’m stoned and might. Be missing a detail…
@mikekhouri3016 FYI diodes can burn out when connected to batteries. Diodes have no resistance to current. They'll take whatever gets pushed through. Best to use a current-limited source to power them (solar panel). Otherwise, with direct connection to batteries a normal resistance heating element is probably a better and safer choice.
Small heat source works for absorption refrigerators.
@kelimike Absorption fridges are really neat. Been looking for a used one to experiment with
@@solarpoweredge That would be fun to watch too. I hope you find one.
GREAT IDEA KEEP THEM COMING
@anthonymarino4260 Thanks, working on more stuff :) 👍
good stuff... thanks for the brain seed...... diode chain you say... I'd never thought about using them as heating elements.... I'm gonna haveta ruminate on that one
@joepeppers1920 Thanks :) food for thought... here's my videos on diode chains / strings
ruclips.net/p/PL8a6nRTNyF9PK7SExvQKNhN0t3RUP9pT7
You can make a water distiller with that.
@kaletsugas Great idea, I was thinking of doing that :)👍
This is cool. "The edge of feasibility" is right up my alley. I was surprised you put the insulation between the coil and the test tube. Why not around both of them to trap in all the heat? I also think a cork (with a vent hole) plugging the end of the test tube would conserve heat and get things boiling faster. Finally, I don't see any problem with putting the induction coil right in the water since it has an enamel coating--or do you think that would mess with the inductive properties? Anyway, this is all just food for thought! Great stuff!
@StuffBudDuz Basically I did not want to further heat the coil, but I am sure there is plenty of heat there to be captured if I wrapped the insulation around it... good thinking!
Nice job. Did the mosfet or mosfets get hot on your buck converter?
@mr.makeit4037 They warmed up some, a small fan kept them from getting too hot. I don't think the buck converter was designed for anything boiling :D
@solarpoweredge i believe your right. With all of the experimentation, my thoughts not only go to it's success but longterm viability and reliability of the tech.
Isn't it more efficient to simply short a coil directly from the solar panel?
By that i mean a submersion heater style coil
@cjdelphi Direct solar electric diode chains are more efficient than standard resistance heating elements or induction, but all 3 techniques bring different advantages to the table. Another way to look at it, we have induction cooktops and microwave ovens - both waste power, but are very capable and unique systems with different pros vs. cons
I was thinking of this for pool heater, but then saw magnet induction. Get your panel to spin the wheel of magnets under copper pipe to induce heat. I would love to see your results to that.
@rubixrj7074 The spinning magnets machine is on the list, it's too fascinating to ignore :)
There's plenty of other videos that have already done this, but by all means.... It should be tried! Everyone else is doing it differently.... Someone is bound to take it to the next level...
If you’re powering that fan as well with the solar panel you might be losing another potential 2-3 watts maybe .
Thanks for the nice video !
@swrekcfest You're welcome :) that's true, I could unplug the fan to see what difference it makes
@@solarpoweredge love the experiments by the way . I’m also doing some myself with solar panels and other methods trying to recover energy at a small scale , so this is right up my alley 😁👌
@swrekcfest Glad you like this stuff, I'm grateful for positive feedback. Hopefully will catch more projects on camera in the coming months, I'll keep chipping away at it :) :D
Wonder if thermally wrapping around the coil would be better. As that would make any heat losses in the coil contribute to the overall heating. (Ok, that is basically resistive heating). Though there might be overall losses when the whole testtube/coil assy gets up to 100degC and energy starts to leak out along the copper wires running from the coil.
But as an overall efficiency, this system is never going to be as good as a straight resistive heater.
@gonzo_the_great1675 The top suggestion so far has been to wrap the coil! the main reasons I didn't are more resistance caused by higher temperature and I felt the enamel coating on the wire was questionable. I usually base my appliances on resistance or diode string heating, this experiment was prompted by several requests to play around with induction. While not as electrically efficient, induction does have very interesting applications and advantages. I learned a lot from this experiment.
I once tried boiling water with a magnifying lens (fresnel). It was only a capful of water.
It totally failed.
Then I dropped in a small piece of charcoal from my aquarium. When I hit it with concentrated solar power it got nice and hot to boil away the water.
I'm not sure which method is more efficient. 🤔
@SciHeartJourney A piece of iron should be much better for induction, however it's also worth pointing out the solar panel could not push any harder than 10w no matter what metal is used. But it's interesting to test this kind of stuff and see what happens
if I saw correctly only water is inside, but if you put some chunk of metal (small cylinder) inside that is solid it will quickly create Eddy currents and water should boil faster, have you tried it ?
@aleksandar7393 Right, that's actually what I did. There is a piece of metal in the test tube to accept the induction power
@@solarpoweredge I think what he meant was to place a metallic ring like a piece of pipe inside the test tube, the eddie currents should be able to get it hotter faster.... If I haven't misunderstood....
If anything, any metal object placed within the induction coil, if it performs better, it will draw more current....
You can see in the video when the test tube is lifted out of the coil, the current drops! It's kinda awesome how it can feel that something metal is getting closer to its coil....
I'm wondering how many watts is going to be needed to bring two cups of water to 90°c and keep it there.....
I have a cordless Kettle from Amazon, it's only rated for 800W (a far cry from the 2200w models we normally have here in Australia), but I had a 3kw inverter and needed a kettle that didn't need so much power regardless of how long it takes to boil water, so I got this thing from Amazon, its a glass kettle with a metal plate, the base station has many options! Including the ability to run at different power levels... Has a temperature display! And when it gets to 90°c, it drops off the power level, once it gets 100°c it goes into hold at 100°c mode for 4 hours! Not a bad kettle, looks nice and works surprisingly good.... The glass doesn't like to hold onto its heat! Anything at 4 inches distance will feel warm...
Even though it does this pwm thing, it still pulls a few hundred watts for two cups of water!
I will be working on an induction kettle.... One that I can put more water in and leave it running at low power (with a temperature controller of course for safety) so that I have hot water ready for coffee at any point in time, we have available a separate hot water tap which can be installed in the kitchen sink and have coffee water ready 24/7 but they are resistive heated and could possibly use a lot of energy than I'm prepared to give for such a luxury..... Yet LoL 😂. Maybe induction can be better at it? I will find out....
@PeterMilanovski I see, I should find a solid metal ring or pipe that fits in a test tube.
That kettle base sounds nice. Most have no settings or control. I have no idea how much power to hit 90c but you are headed in the right direction!
I have two of those induction circuits, I wanted to test if I could heat water going through a copper pipe, I got up to 6v on my lab power supply which wasn't quite enough power to heat running water... There was about 60W going in and I wanted to take it to it's maximum of 12v but I noticed that the induction coil was already quite hot at 6v and it dawned on me why all the coils in the videos that I have watched (and I have seen a lot of videos) were black!
I wasn't expecting a huge difference in temperature but was hoping for at least 2°c difference which would take a considerable amount of time to heat water in a large tank but I would be happy with that result...
I have ordered and received new induction coils made of copper pipe which I plan to route the water through first and then pass through the pipe through the coil to absorb the coil heat and get some more efficiency out of the system instead of letting the heat from the coil evaporate....
Even if it can't heat a 100L boiler tank of water, if I set up the system in series before the main boiler tank, pre warmed water will take less time to heat to 60°c than the current situation of cold water going straight in.
I already have two boilers in series, the original gas unit and the new heat pump boiler which is doing all the work since it was installed, the original gas unit gets its water already heated and just sits there waiting for the temperature to drop, it's kinda like a backup....
That induction circuit is good for 120W.... I'm interested in how much water can it heat in between hot water usage (showers, dishwashing). The heat pump boiler runs for 2.5hrs after a long shower, if this kit can reduce the run time by even half an hour, then I'm happy! Might even consider hydronic heating and going up to a 600W induction circuit....
It can build up hot water when I'm not home or overnight if I'm not using it so it doesn't need to be fast, you won't need a huge battery to keep it running overnight....
I have yet to test the new coils, I also received new water pumps but one wasn't glued together properly and has a leak, I'm in the process of getting some glue to fix it before I put together a new test circuit.... Hopefully this time I can ramp up the voltage to 12v... I also got two inline flow metre with built in temperature sensor... So I can see what sort of temperature difference I will be able to get... If not quite there, I have a second induction circuit for twice the power....
I also need to invest in another lab power supply, I need to control the speed of the water pumps and control the induction circuit independently... If the water is running to fast, I might not be able to see a difference in temperature... I have a spare 12V SMPS that I can use, maybe I might have to manually switch the SMPS on and off to move the water a bit at a time? Don't know yet, I'm always thinking and looking ahead trying to preempt anything that I can foresee taking place.....
Actually, I have plenty DC to DC converters.... I will use one with the SMPS! Ahhh! Excellent, thank you for that!
And just before I go digging out a suitable converter, I wanted to ask for your opinion about the series diode heater you made, is the diode setup more efficient than resistive ie nichrome wire?
Like which one do you think could heat and equal amount of water faster? If you put in a bit more power into that induction circuit, that water in the test tube would have boiled so much faster, I believe that there are these things called magnetic stirrers, used in chemistry.... They are wrapped in plastic and could possibly be able to withstand 100°c (not sure at what temperature water boils in freedom units LoL). And I'm not sure if the actual magnet is the stirrers on in the base of the stirring contraption.... It probably has a name for which I haven't had the need to know yet LoL.
You would prefer to have something in the water other than metal... Although stainless steel might be okay....
There is a flat pancake induction coil that I also plan on getting, I have had a good flat bottom stove top kettle for some time now waiting to be used in an induction circuit... Ohhhh I just remembered, the kettle is stainless steel and apparently doesn't work with induction circuits..... Hmmm need to find a new kettle, perhaps with a copper or aluminium base.....
Actually, was that just a steal bolt in the test tube? It looked shiny like stainless steel..... I would be very interested to know, going to re-watch the video to see if you mentioned it....
Anyway, great video, as always to short! I don't mind seeing stuff being put together and listening to whatever you have to say along the way.... Sometimes it's educational and others can be funny.... Either way, keep up the great work! See you in the next video..
@PeterMilanovski Those experiments you're doing sound very interesting, keep up the good work :)
I figured a lot of power would be wasted in this circuit, but just had to try it. Sure enough... coil gets pretty hot. Who knows how much power is wasted. But that's OK I love the idea of heating a piece of metal with no wires going to it!
Matched diode strings, *****when driven by a solar panel***** are significantly more efficient than standard resistance heating elements. The resistance element is linear, diodes are exponential/logarithmic. I made a few videos here but hope to expand further on it: ruclips.net/p/PL8a6nRTNyF9PK7SExvQKNhN0t3RUP9pT7
There are no guarantees, but I have had some success using stainless pots on induction cooktops. The bolt is stainless steel - the idea being it cannot corrode or hopefully impart harmful substances into the clean water. Obviously other metals are better for induction, but they would probably rust too...
Due to the high pressure to keep people watching, I tend to cut videos short and move along quickly. This has definitely ruined a lot of my work. If the channel ever gets to 100k (how many decades will that take?), I'll slow down and make longer more detailed videos with explanations, stats, spec sheets, etc. That's truly what I always wanted to create :)
@@solarpoweredge Hey! Thanks for the info!
Okay, stainless steel somewhat works and now my induction heated stainless steel kettle idea is back on the drawing board! Thank you!
I have already seen the video's with the diodes, it was the first time I was thinking how come I have never seen this before? A brilliant idea! Einstein level of intelligence right there! Possibly beyond Einstein..... He couldn't figure out what gravity is....
Anyway, you might have mentioned that the diodes were more efficient than going with resistive solutions but I think that I was to impressed that I may have missed that bit of information....
I'm currently looking for a cheap avenue for diodes in TO220 packages because they have mounting tabs and I can screw them to a heatsink for a bit more surface area and better temperature transfer!
Not much luck with eBay and AliExpress, most parts on there are probably counterfeit, so I'm looking at the major electronic components suppliers for something that is quality and able to do the job....
I feel like I have a lot going on and I really need to pick something and dedicate as much time as possible! I need to finish at least one project! Could really use a boost in morale from a win ...
@PeterMilanovski Welcome :D those TO220 diodes should be great, easy to screw onto a heat sink. The axial ones are tedious to work with. Usually requiring some kind of thermal cement to attach. I know what you mean... there are 10,000 projects and only a single human (or in my case probably 1/4th) to do them. So I try to focus on no more than 2-3 things at one time. Right now I'm building a small peltier fridge prototype using some promising new ideas, it's taken months to get there :)
@@solarpoweredge I'm also in the process of doing Peltier devices, looking into diodes, the weather is slowly getting better here in Melbourne so I will be up on the roof installing panels to take advantage of the afternoon sun....
I'm also working on an idea that I can't really talk about, but if it works, it will break the second law of thermodynamics.... I have heard too many people say that it can't be done but I'm going to try something different that I haven't seen anyone else do, I have built it up in my mind and have seen it working so I'm 99.9% sure that it could work... Fingers crossed that it does... And if it works, I should be able to upscale it to provide me with all the energy I need.... But until then, it's going to be a secret... But in the meantime I have to develop an efficient solar powered personal space heater because the wife prefers to have hot air blowing directly at her even though the house has a gas central heating unit which runs day and night... Something that I really want to get away from... Which is why I'm looking at every different way to heat! To220 diodes mounted on aluminium slats with a fan from behind like a traditional fan heater might work.... It's something that I want to try... I have also thought about induction for space heating and even Peltier devices for heating which should be really good but I just need to work out how to send the cold side outside!
It's a working progress.... When I get stuck on one idea I move on to the next....
It is what it is and we do what we must!
It's the people like you and me who work in their garage that eventually end up turning into Apple or Hewlett Packard.... Started in a garage and had to move to a bigger garage and so on...
@PeterMilanovski If they say it can't be done, I'm all for working on it! That's how things get invented... thermodynamics is just a model, a very useful one. I am sure there are phenomenon that operate outside its boundaries...
you need to warm water up in a kettle for tea or coffee
@colingreene7359 Will have to work on that!
Why did you put insulation over the test tube? I agree you need insulation, but on the outside of the coils, to prevent loss to the air. If anything, you should try to increase conduction between the coils and test tube.
@jodaboda1 To retain heat. After adding the insulation, it boiled quite vigorously
@@IragmanI In theory, you are correct, but the coil also heats up quite a bit due to the resistance of the wire. It might be worth while to try to capture that heat as well.
@@Guishan_Lingyou definitely! I replaced my coil with copper pipe so that I can run water through it, this way I can preheat the water before it goes through the main pipe to be heated via the coil....
That solid copper coil wire will turn black from how hot it gets! I touched the coil while at 6v and thought wow! So much heat going to waste, I need to get it in circuit and absorb it into the water that I'm trying to heat anyway!
There's a lot of other videos that talk about induction heaters but not many of them mention that the coil also gets hot! You can tell when someone post's comments about something and hasn't actually played around with it.... You really need more than just book's.... Get a couple of these cheap things and blow one up so that you will know what it can't do! Besides, it's a lot of fun....
Link for that constant current buck converter? It's not in the "parts" notes/links.
@chrome98 Hi, sorry forgot about that, link added! Thanks!
or use a battery to buffer power. yep you can charge a battery very long at low input power.
@gsestream Good idea
I was looking into getting a buck converter to charge my Ebike battery with solar. I tested the posibilties out witha small solar panel from my boat battery maintainer. it only puts out about 23 volts at peak. but it will charge my power tool 20volt batteries as is, just wont get to 100% charge.. It takes all day, at least thats how long Ii waIted before I checked the state of charge, then I plugged it into the regular tool charger, and it literally took 15 minutes to finish to full charge, so it was very close to full.
@billk9628 Cool! Only a guess but there is possibly not much current flowing once the battery hits 21V, which certainly makes charging a bit safer. Btw it's worth checking whether this charging method activate the BMS/balance circuits on the power tool battery. I ran into that issue with my Ryobi 18v power tool batteries, which is why I use a modified OEM charger with the solar panel. Otherwise, some of the solar panels I use (VOC 22-23v or so) could damage my Ryobi batteries.
Wouldn't a metal "test tube" work better?
@Scaliad I don't have one, but certainly worth a try
It's all about surface area when it comes to induction, had the bolt in the test tube been smaller, all the induction energy would be going into something with a smaller surface area which is more difficult to transfer it's heat to the water and will therefore get hotter, in turn it will then be transferring it's hotter heat to the water effectively getting it to boil sooner....
The more mass, the more induction power needed to be useful! That's why you need at least 240V that's capable of plenty of current for an induction range (or stove)... Posts and pans have a lot of surface area and plenty of mass! It would take too long to cook anything with less power, though there's plenty applications for low power induction heaters....
If it snows where you are, and you use an AC heat pump for heating your house, 20 - 60W worth of induction power to a coil wrapped around one of the aluminium pipes going to the outside evaporator/condenser might just be enough to stop it freezing up and causing the AC unit to go into defrosting....
At 60W power consumption, you won't need a huge solar panel plus battery to keep it running day and night.... You will have to figure out how to get it to turn on and off automatically..... That's the challenge... I would probably use an off the shelf temperature controller that will turn on the induction circuit when a hot temperature is reached and measured on the inside of the house where you want the heat to be on a really cold day.... If the AC unit is running, the controller will detect the heat inside and fire up the induction circuit outside to prevent it from icing up!
There! Simples!
Might be a bit how ya doin, but I see no reason why it wouldn't work!
I'm almost sure, that your "screw" is not ideal induction power receiver, not all kinds of steel work equal.
To bring 100 mililters of water from 25C to 100c you need about 9Wh of energy (if it is fully isolated), so with 10 W it should take about 1 hour.
@AK-vx4dy Was a bit curious to try that type of metal. Last test it took less than an hour to boil. The footage is a bit random, as it took several weeks to get all this done and recorded - lots of interruptions
Why would you insulate BETWEEN the glass test tube and the induction coil? I am not grouching, and like the work. You want THERMAL CONDUCTION there, no insulation and preferably a metallic tube. Put your insulation on the OUTSIDE of the coil to contain heat losses to the ambient air. Same experiment will do better I think.
I saw where you boiled the egg in the 12v DC cup. It was probably dual wall, maybe vacuum insulated. GOOD. No better thermal insulator than vacuum. A dbl wall VACUUM insulated vessel like one of the gigantic coffee cups, with the coil in the skinny part at the bottom might be a good try THERMALLY with the cool stuff you are doing ELECTRICALLY.
Also if you double-coil your induction loop, winding TWO strands instead of one, then both +/- conductor ends come out the top side by side and its easer to immerse in your vacuum cup, instead of having ONE conductor run up the side from the bottom. Keep it up with the induction because I think those can be made more efficient than other stuff.
@mrwayneright Thanks for the feedback... In my mind, I was just not interested in further heating the coil by wrapping it in insulation. Maybe will try that in a future experiment. Obviously quite a lot of heat is being wasted - that's worth improving
সোলার প্যানেল লাগবে খুলনাতে পাওয়া যাবে মোবাইল নাম্বারটা একটু দেন
Hello, best wishes to you and your projects
A simpler way to get magnetic induction heating is to run an electric motor spinning a disc with.alternating N S magnets glued. To disk. Only need enough power to run motor and alternating magnetic fields would do the heating
@miken7629 Really need to try that, very interesting!