WATT THE HELL is an amp hour? Sailing Vessel Delos
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- Опубликовано: 4 фев 2025
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If you've ever wondered what the hell an amp hour is, how to calculate your power usage onboard, and what it means with respect to battery capacity then this video is for you! If you like this type of content and would like to see more please support us at svdelos.com/beer .
Fair winds! Capt. Brian
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Nice one Brian! We've found there's a huge demand for technical videos like these, so keep em coming! Cheers- Nick & Terysa
Agreed! I'd be really interested to see (from either or both of you!) a video on the other side of the equation - power in and how to think about wattage from solar/wind/gen compared to whats (ha) being used.
@@ianwhite1287 will definitely give some thought to how we can do a video on this subject. Thanks!
I used to teach science to middle schoolers and this is exactly the kind of math/science problem that gets kids excited. You'd be surprised how many kids would be desperate to know how long they can run their iPhone or laptop or keep their fridge cool. Practical application of electronics and basic math combined with a little introduction to more sophisticated engineering, chemistry, and physics is just the right approach. If I were still teaching I would have used this video in class and paused to have the kids guess. It's only the realness of the application of these ideas that gets most kids invested and you did it beautifully. I'm so thankful to the entire crew for doing what you do because I know that you've inspired so many people to take on board (ba-dum-tish) concerns and problems like this just as they take on board your adventures. If you didn't make videos like this alongside your adventures your overall amperage of pedagogy would be 1/2 capacity. Yep.
When you make the next move you might consider education. All of you have the right gifts and (not to diss on anyone else) Brian and Kazza you have incredible dispositions for conveying information (Brian) and personhood (Kazzaa) that could benefit even more people directly. Brady would be incredible with middle-schoolers and Alex with either elementary or college, while Lesir could handle any troops just about on her own (we're counting on you dear leader). Seriously though all of you might consider teaching as part of your next steps. You each have incredible gifts that we can all see you're glad to share. Even if you never take that plunge you've done a lot already (see last vid), so thanks from a fellow educator.
Make more of these kind of videos. After 11 years of my Bryan trying to explain how all this works to me I’m closer to understanding it than I’ve ever been. Granted he is sitting here next to me drawing diagrams of your system to help me. And I probably won’t remember tomorrow what I think I understand tonight. But I really appreciate that I can come back and watch this again.
As a low voltage technician preparing to sail like you one day, thank you so much for doing a video like this. Been watching your videos for awhile now. I'm a native Oregonian. Still here
Yes I know.... A little EE nerd humor never hurt anyone right? Ha Ha. This ones for you Steve, thanks for asking the question bro 😀. If you guys have questions or comments lemme know and I'll do my best to answer. Fair Winds- Capt. Brian
Sailing SV Delos whats the best way to ask a question?
We want to buy a amel is Delos for sale in the near future thanks
I was so inclined to write to inquire about this topic. You made me buy a boat, you SOBs! Thanks.
Actually EE nerd humor has caused plenty of damage my friend 😳
I would be super interested in a video on the recharge rate from solar/wind.
Searching "Solar power" or "Off Grid" is the reason I found you guys in the first place. I'm building an off grid cabin and searched those topics. Though since I found your RUclips page, I'm far more informed than when I first started watching (4 years ago) It's still a great Video Brian.
Hey Mark, that's very cool! Nice to know how you found us and thanks for sticking with us for so long. Brian
Very useful video! We really like the technical videos. There's definitely an audience of active sailors here for videos on seamanship, ship's systems, sail trim, comms, anchoring, etc, etc. Keep 'em comin', Brian!
Mike Adamsky ditto that, love the tech stuff 👍
Super cool adding a (dyi/behind the scenes/instructional) video short every once in a while to complement your standard length uploads. They don't have to be very polished and perfectly edited. It was refreshing. Thanks SV Delos, you can do no wrong.
Hey guys
I really like when you show this part of your life. Don't get me wrong the beaches,beer, and waterfalls are important, but this is how your able to do your adventuring. Keep up with the maintenance pieces.
As a sailor, this was definitely my favourite Delos video - thanks for all your work!
I really like this kind of videos when you explain the systems you have onboard. Also the ones where you tear down and repair things or replace/upgrade stuff. Keep them coming once in a while!
Agree.
I've been missing these tech videos. It's amazing how a bunch of random tid bits over the course of a few hundred videos add up to some proper knowledge. Please keep this type of video in your repertoire.
That was fantastic! As and engineer by training, you are a very good teacher. I enjoy the technical stuff. One thing I have noticed is that the videos depict you as essentially able to fix anything. I would like to hear your approach to fixing things - where do you start in the process of figuring out what is wrong with the thing? What is your analytical framework or approach? I think that would be an interesting video.
When my wife and I did our circumnaviation we charged our laptops up using 12volt adapters and found we used much less power as there was no Waste from running the inverter, maybe wirth looking into. Love your posts brings back memories.
Delos crew, I love these technical videos. Understanding the inner workings of delos really helps the viewers understand the behind the scene stuff.
Keep 'em coming Brian, I liked it a lot. If I may, the 100 Amh rating is a 20 hour rating. Meaning a continuous 5% load (5 amps in your case) will take the battery from fully charged to dead in 20 hours. Doubling the load to 10 amps does not halve the life to 10 hours, more like 5. With a 1 amp load the batteries will last a lot longer than 100 hours. It isn't linear. And now you know. Thanks for sharing and fair winds.
Great to see you back doing the little boat-tech vids, Brian. Along with your talks on local history and culture, they add a certain richness to the whole Delos package. May I suggest a "Brian's docu-slot" in each or every second episode? I wonder though... with this presentation, are you leading us toward a possible Delos power-tech revolution?!
Keep up the fabulous work guys, you brighten up our weeks!
yah i'm going to ditto this comment. I really enjoy the narratives of new places and interesting historical perspectives, even if you're just reading it off of wiki or so. th.
Love the tech aspects of SV Delos. Love that. Love that, love that, love that. I first clicked a "like" button on Delos when Brian repaired an engine in Southern Africa, and found a replacement part on shore for, I think it was less than a dollar. I follow Sailing Uma as well, as they have these ingenious ideas they follow up on, their electric motor for their yacht- doesn't work so well, but the idea was great- and their repair jobs and fibreglass work. I first followed sailing videos with SLV, but they don't do much for repair and maintenance. So if you needed feedback on this one, to find out if this aspect of sailing is interesting to anyone, it is 95% of the reason I follow Delos. Muchos gracias, as they say in Southern Poland and parts of Flagstaff, Arizona.
Very informative and interesting video. Thanks for the info. Most people like me just think you jump on the boat and sail. There is so much more that must be learned to sail. Much different that driving a car. Nice to know you guys have a handle on what it takes to sail a vessel like yours. I would think solar and wind is a gold mine and would be an interesting topic. All the technology we have and they still can't make solar affordable for most people. Thanks to our electric companies. Every house built today should have some solar. Living in Northern Nevada is ideal for solar, only if you have about 50 to 100K laying around to have it installed. I had solar hot water 30years ago and that went by the wayside. Thanks again. Didn't mean to rant. Love your videos.
i LOVE the break down. Shows where the juice is being milked and where it isn't. Great video! Thanks for sharing!
As a novice "don't even have a blue water boat" I crave this type of information! I'm subscribing now in the hope that I can learn more for my eventual adventures. Fingers crossed! 😎
As a guy “born at the beach” and who has built boats too, I’d say my best advice to the novice is:
Don’t focus on the knowledge about details. That focus will keep you away from your adventure. Focus on the quite few essential items, like having a boat you like, a way to avoid bankruptcy and a date of departure. The other stuff you’ll fix as you go. If you wait with leaving until you are finished with learning important stuff, you’ll never leave, because you will never be finished learning.
Stein Varjord That sounds like sage advice. My plan is to find a carcass that I can throw all my money and the next 10 years into before I start living aboard and taking weekend trips for 3 more years until I can retire. I'll never save enough to just purchase something ready to go. But if I have a project!..... 😎
Michael Tillman, that’s a plan! Just make sure that the road towards the dream is nice too. Make it to some extent part of the dream. Fixing or building a boat sometimes turns into a life destroying nightmare. Not because it’s so bad but because the one who does it has the wrong attitude or something like that. Also, your surroundings might see it as unrealistic dreams and treat it as that, which can become demotivating. So, make sure it isn’t unrealistic. Not by aiming to low, but by having pleasure from working towards the dream and from not exaggerating the self depravation in cost and unpleasantness.
All that aside, you’d be surprised how nice boats you can get for very cheap or sometimes even free. If you have the time to look around and be curious... Don’t expect to find it in an ad. For instance, all harbours have boats lying around that are a problem because the owner has “disappeared”. Most of these are not worth your time, but some are... What you should look for is not a carcass but something that is just what you want, but that looks worse on the surface than it really is. That’s realistic to turn into a good cruiser in way less than 10 years, even with limited knowledge. A too big project can make it hard to see the end of it. Also don’t think you need a very large boat. Maybe even start with a properly small one that you can learn on and make nice so you sell it for a small profit to get started a bit bigger. You learn the core of sailing a lot better on small dinghies than on bigger boats.
Stein Varjord thanks for the advice. I've heard all this from several different sources and am looking for a trailer queen for starters. However I have found that the more I know before I dive in head first on anything, the better it turns out for me. Do I want all electric? I don't need a good engine. Do I mind fiberglass work? Deck issues may be a bargain maker. I know that I can't weld so steel is out. I like to tinker, so replacing hoses and wiring would be a nice hobby that I can get lost in. Same thing with wood working. I can easily see all new custom cabinetry throughout. I just hope it'll still float under the double and triple systems I'll probably wind up installing. And replacing when they are outdated before completion. Again thank you for the advice and it's well taken as i figure that if I hear something once, it's something to think about. If I hear something from different sources I had better pay close attention.
I'm cruising next year, first time not chartering.. so these videos are exactly what I'm looking for. Been following you for years, but it's always these sort of instructional videos that I like the most. Would love to see more of these. Engine maintenance would be another great one.
Yes more tech spec vids please, thanks! I started following the Delos story last year, now I find myself about to take ownership of my first sailboat. Need all the help I can get!!!
same here
Three
Yes, definitely keep them coming! My husband and I watch your videos for insight and education about the cruising life!
We are planning on our own adventure in two years and this helps (at least me) a bunch! 👍👍👍 Fair winds!
The most amped up video yet. Thanks Capt!
i wasnt interested in sailing until i saw your video 1 year ago and since then i check everyday of your latest vids_i enjoyed watching all of you DELOS!! be safe always.
now this was a very different delos video..........but different in a good way - we are waiting for the solar/wind vid now, it should be very interesting to learn since many out here need that info. for other related fields........fare winds.
At last a decent relatively simple and clear explanation of how amp hours work. Thanks for that Capt Brian.
The electrician arrives home at 3am.
His wife asks him, "Wire you insulate?"
He replies, "Watt's it to you? I'm Ohm, aren't I?"
ha ha nice!
now THAT is funny
shocking
I use to build houses, but when it came to the electrical stuff I'm lost & leave the work to electricians. I have followed Delos for years & always enjoy your video's. Keep stuff like this coming.
Jerry
Things better to be understood than neglected, and unexpectedly revealed.
I love the technical stuff. One of my favorite series of videos were you guys re-rigging the boat.
As an engineer myself, I think you guys did a great job explaining this. Of course I am a nerd about stuff like this. :)
As another 35+ years as an EE nerd I did some of the same calculations because I rent sailboats often and I try to understand how often I need to run an engine to make sure we can start the engine in the morning, most rentals do not come with more than 2 batteries, so I bring my own Honda 2000 for emergencies. This was really cool thank you, more tech stuff would be great for us nerds!
I'd love to see a passaging making electrical demand requirement video, including when/why you're running the generator and/or tow-generator (if you even bother with it anymore). Including data from average power inputs from the panels and wind generators. Also, any general purpose provisioning videos with a breakdown of how much food/water is used per person per day including fuel requirements both propane and diesel both at anchor in the middle of nowhere, as well as passage making.
YES Cameron, some excellent points here. Thank you so much for the comment and ideas!
I'd be happy to volunteer my time to help with these calculations during a passage! I promise I won't drink my weight in beer every day!
I'm more of a wine and "scoth" kinda guy... so running that distiller would have to be included!
Thanks a lot professor breeyan! What I like watching delos is that I'm not only entertained by the beauty of nature and thrills and adventures but also the full-stack of knowledge that Brian, Brady and the rest of the crews collaborate makes the video content very fruitful and contextual.
Enjoyed the video....recently performed the same math drill determining solar needs for my cat. However, your tech episode(s) are a nice change from the drone videoing the videographer videoing a videographer videoing someone for the “project”. Old style Delos....Buying you a beer today.
love seeing the technical side of what you guys are doing. There is so much more to just sailing around the world and drinking beers that we normally don't get to see.
He's a very valuable Captain.
Interesting video, and educational .
Are you going to be testing the crew ?
LOL"
Thanks for sharing
Big fan of the technical videos Brian! To be fair, all Delos videos are sick but as someone who recently bought a boat with the aim to take her blue water with limited technical knowledge the educational vids are super helpful!! Keep up all the great work you guys are doing, huge love for the Delos Crew. If you find yourself in the UK it'll be my pleasure to hook you guys up. Andrew, Faversham UK
Great video Cap,how about one with all systems going ,nav,auto,radar, charts etc. Where u off to next
I love the "behind the scenes" technical videos. I LOVE ALL the videos you guys make. Keep them coming. I think a really cool subject would be to give description of the different sailing techniques for us landlubbers. Kinda like an advanced "Sailing for Dummies", I am saying not a how to video, but just enough so we can more understand what you are doing. Like how to sail into the wind, jibbing or why you use the side pole, IDK, that make sense? Some pics or some graphics to help some of us understand what you are doing. I love you guy's and your channel, been living vicariously through ya'll for a long time, but I have no desire to sail around the world.
You forgot charging your phones, cameras, drones, etc. Great interesting video though! More of this different content every so often is really appreciated for us Patrons!
Yeah so true... Will hit that topic up in a follow up :)
And when your chargers are pluged-in they pull power. Phantom power is a drain on the system.
Jade Traveler plus if your batteries or any part of the system has a ground, it pulls some current. Where I work, we check for grounds in our battery systems for safety reasons because we can’t have anymore than a 2mA ground or greater.
I think having left a few amp draws off the list in no way detracts from the value of the video in terms of getting the concepts across. There's always going to be some electrical load you didn't plan for, which is why you have to allow for some excess capacity in the system, as I am sure Brian has.
Using the closed caption option on this video because my earbuds broke. They keep calling Delos - Dulles, or Donuts, haha. Very clear explanation of amp x hrs and that whole formula I needed to relearn from high school physics Brian, Thanks!
On the subject of electrical systems, do you use or plan to use any type of cell repeaters, such as the Yagi antenna that you 'aim' at the inland GSM, CDMA, UMTS, LTE, et cetera, that connect (usually via a 10 meter cable), to a booster/repeater then to an booster-mounted or central located 'indoor' antenna connected to the booster/repeater via a given length of coaxial cable? Both cables usually are 5D-FB Coaxial Cable OD7.5 ( High transmission speed, High quality). I have seen/used these on land many miles from my carriers nearest tower, and it works wonders at a cabin cut off from everything where it is either fly-in to a lake or a long days hike in.
Absolutely love these kinds of videos from you guys! I've been sailing for >40yrs and I'm on my 10th keelboat transiting from racing yachts to our first offshore cruising yacht and I'm still learning about this stuff so anything you can share is, of course, very welcome. Keep them coming! SO much more interesting than how someone is feeling and all that emotional crap. You're blue water sailors! Let's talk about what it takes to run a blue water yacht! Thanks again. Cheers, from Singapore.
I say you do a dingy comparison ... aluminum vs aluminum bottom vs gift bottom etc.
Or
How you balance your boat so the auto pilot works efficiently
Or
Your lithium battery install
Or
revisit how the new electronics r working
Or
better yet how u made it transmit on WiFi
Well done!! When I did the solar for my RV-life, I had to learn all of this too. It turned out that I was moving a LOT, so I only got a 200watt system, with a big 12v battery. It lasted the night to power my furnace and LEDs, and if the day was a sunny one, I could make it without running the engine to charge; and that’s with us running half of the computers you guys are for a couple of hours.
My good friend asked me recently about solar for his trailer, I’ll send him the link to this vid. Thanks for sharing, capt. Brian and crew!!!
Good Video Bryan..... I would like to see a video on at sea security.
I'm packing on my boat ...legal or not. Rather be judged by 12 than carried by 6......lol
Brian you are correct on the low end of cycle rate of battery ! There is degradation on the upper half of battery life also ! AH usage and storage are much harder to equate . To many factors . Good job ! Keep up the good work , and Thanks
Wh or kWh as units for energy storage capacities make more sense to me since the battery voltage fluctuates.
100W can draw between 3.45 A and 4.76 A on your system depending on the state of charge.
Now thats gonna confuse people who thought they got it :D
NotnaRed throw some peurqart theory in there to trigger everyone:-)
I’m no electro technician, but as far as I see, Amp hours is a pretty exact unit. Kinda like Liter or Kilo. With liquid lead/acid batteries, the battery drain will be much more for a rapid draw when compared to the same Amp hours taken out slowly. (The Peukert Effect.) But this is the same with Watt Hours if measured in result at the consumer end. However, the important observation in this case is that with Lithium batteries of the LFP / LiFePo4 type, the voltage will be pretty close to unchanged at the whole battery cycle, almost no matter how fast the draw is, and there is no noticeable Peukert effect at any realistic consumption level. Actually the batteries can happily supply 200 Amps at steady 26,6 Volt (nominal 24V) sustained, and much more, (level 0,5 C), with close to full capacity. Lead batteries would not be able to supply that much current, have a big voltage drop and either way be completely empty after supplying maybe one tenth of rated capacity. LFP is a new world...
I love solar and wind energy. I am amazed by the prospect of renewables. I like that Delos (and a lot of other live aboards) use renewable energies. Thank you for this video. I always enjoy things that teach and show me something new.
Perhaps you have done it in the past (mebbe before I was prepared to comprehend)... can you comment or make a video about your solar and wind generation capacity, please? The large capacity panels consume huge space. Is there an issue charging a 12V starter battery and the 24V battery banks? What is the primary reason to choose a 12V, 24V, 36V or 48V battery bank? How are wind and solar (multiple) chargers connected to/prioritized for charge input? Does your system include a galvanic isolator? Thanks.
The main criteria to choose the voltage of your DC system is the maximum current you will pull out of the batteries. If you have systems that, all together use like 1200W, it means you will draw 100A from your batteries if the voltage of the system is 12V. That is a very high current to manage. You'd need very thick wires and would still loose too much energy as heat. If you increase the voltage of your system to 24V, you lower the current to 50A, which is far better manageable. As a rule of thumb you should try to keep your maximum current values below 70A or so.
Thanks for your contribution to my growing understanding.
Excellent explanation Delos. Easy to understand for us non electrical sailors.
Great info! We aren't on a boat, but boon dock in our camper.
I really appreciate you guys making this video. I watch all kinds of DIY and how-to videos on RUclips and SO many Tubers take the popular position of "aww, I don't wanna do math," "nobody likes math," "math is hard," etc. But I like knowing how to be best positioned to stand on the shoulders of giants in order to get the most out of information / life in general, and math is a very good way of communicating repeatable physics in the real world. Watching you guys work this out step-by-step and scribbling the results down really helped me understand this concept. Cheers!
What I find interesting is how through careful choices of our electronics, and frugal use of the power hungry devices, we can replenish our power draw with even a simple solar system. I had two 100w solar panels on my last boat which was sufficient to power my simple systems without the use of supplemental electricity, with only two 110ah AGM deep cycle batteries. Granted the power draw was limited to LED interior and nav lights, nav equipment, vhf, assorted sensors, pressure pump, inverter and computers, but for an old dog like me the fact I could generate the electricity to run this stuff just blew me away.
Now "Mr. Science" please tell us how leading edge battery technology changes the math? :-)
Check the current draw of your various motors like anchor winch, etc. Record the info. On your preventative maintenance schedule check again every few months or other appropriate interval. If current draw starts going up the motor or something connected to it may need some TLC like lubrication or cleaning.
Seems like a lot things to maintain on a boat of that size. You do a good job. There are some folks that should not be allowed to hold a screwdriver. They have to get someone else to help them. It's good that you can do it your self as there is no one to call when you are on passage many days away from shore.
I enjoy your videos. It is great winter entertainment. Keep it up.
...how many amp hours does the homemade alcohol take?
They'll have to do some drinking for that one in order to have empty bottles to fill during a distillery test run LOL
He He! Well now that we have installed Lithium and can run it off the inverter we will need to make that video :)
Our brew master would say almost nothing
Hey Guy's I just realized that I don't comment very often due to the Constant quality of information the beauty of nature and the oceans and top notch Crew from Delos,,,You guys are the Best F' the rest...P.S. I always hit the tumbs up...Many tanks....
Excellent explanation, Breeeeeeeyaaawwn.
I love the technical and boat stuff the most, but your balance between stories, history, personalities, adventure, tourism, culture, etc doesn't suck at all! And SAILING!
Sooo watt is the length of a piece of halyard again??
I love these videos as it shows us the technical side of sailing apart from the blue sky! Thank you delos!
-Singapore
Obviously, would rather watch naked ladies swimming but I liked this video and would like to see more like it.
HAHAHA we haven't seen Nakies for a few seasons, Must have to do something with RUclips monetization. SOO , Battery math it is lmaoo
patprop74 yes, math is totally sexy!!
This was a very educational video! Not every boat is set up to know exactly how much power is being consumed & when. This is a feature that we should all look into, if you are serious about cruising for any period of time longer than a day. I know that I have had issues with my batteries in the past & that it is not an expense that I look forward to. Replacing batteries can be expensive & knowing how to properly maintain them is very important. Thanks for the knowledge! I know that when I purchased new batteries there were many options to choose from...
Have you considered going to lithium? Have seen several vids on them, seems the way to go
that's what confused me because i thought he had lithium, and they made this example for led. and there's less of a problem running the battery low on lithium right?
It is a terrible idea to take 8 points of failure and turn them into 7,000 points of failure. They have already made the move to lithium batteries but I believe it is an absolutely terrible idea. Lead acid batteries *may* have a shorter lifespan when they are run too low. If Lithium batteries are run too low they may never take a charge again or may explode or may catch fire. As usual it is important to not trust the salesman.
You can go lower and you get more cycles: win win
No they don't have lithium.
I thought they had gone to lithium too, maybe this was shot a while ago?
Timing could not have been better for the release of this video. I’m thinking through this very formula right now for our boat and trying to decide if we need more storage and/or more solar. I currently have 4 lead acids for house with 122 AH capacity each, 200W of solar and a wind gen. Seems to be enough for what we are running but we flat lined the other day so I’m rethinking it. I haven’t actually done the math yet so this was perfect at showing me how to do that. Thank you and 1000 likes👍.
In my Yidish Papa Voice: "And after Eight Years your JUSt Figureing that out?"
I have been curious about this subject for some time now. However, I never thought Brian would be the one to clear it up for me! Thanks!!
Depending on what was running at the time, that Mac power usage could really spike upwards. With Windows, the hardware drivers are just written by... Whoever got stuck doing it at the HW company, so they don't always turn themselves off or scale their voltage as needed.
Since Apple controls all the drivers however they want, they make sure to turn things off and modify their power draw as needed.
I'd be interested to see the draw when both are actively rendering a video!
Yeah good call James, when we get back to Delos will run that comparison. Brian
I think the asus notebook is a more powerful computer than the mac's. Although you must make shure that both are completely charged and are working on a normal load.
Those ASUS probably have external GPUs in addition to the embedded Intel. They alone can consume 150W. (6Ah@24V), then you have a bigger display, and if the laptop battery is charging at a higher rate can pull more current.
yea, i believe that laptop of brians is a Rog. ( Royal order of Gamers Addition ) which is a gaming Laptop / Beast and Will definately Have a Dedicated graphics card. it Should also Render Faster than the Mac If it Has a intel cpu , The Mac's are a Much more Fuel efficient machine by design standards & build quality.
These are both GAMING laptops, it should be born in mind. They use FAR more powerful hardware, and are generally far higher performance than the Macs. So it's really not a fair comparison.
Great info Brian. I knew most of it, but its always nice to hear it from somebody else. I always need a refresher, when you get older, things slip out of the mind. If we don't use it, or maybe I should say, if I don't use it, I tend to forget it. Or my brain just forgot where it stored it. Stay safe and fair winds.
Watt's up. Love that title. Will you be breaking down the power benefits on the new battery system and electric loads in the new galley set up mentioned a little while back? I have been trying to fathom how a battery powered electric stove compares to propane. I started thinking about the new Delos system after watching a recent Sailing Uma video on "Propane vs Alcohol".
Assuming electric induction cooking, one would expect an induction stove burner to consume 44 Amps. Is this what Delos is expecting? Or is the new stove system much more efficient than standard induction cooking? I'm guessing the cooking time probably reduces by 50% too, so if one normally used a propane stove for a total of 2 continuous hours a day, then that would be reduced to one hour with induction cooking. This would imply 44 A*hr of daily use for stove top cooking. Which I'm guessing is reasonable with other high loads and a new high tech battery system. But I'm at a loss to see how an electric oven would be feasible. Is the new system an electric/propane combo?
The 44 Amp load is based on an equivalent standard gas stove burner out of 7,000 BTU/hr. Which can be expressed in term of Amps as 7000 BTU/hr * (1055 J/BTU) = 7.4 MJ/hr = 7.4 MJ/hr * (1 A*hr / 0.0936 MJ) = 79 A. Only about 50% of the heat from a gas stoves goes into cooking whereas an induction stove is likely 90% efficient. This reduces the current load to 79 A * 0.5/0.9 = 44 A. Note the Amp*hr conversion assumes a 26V battery (1 A*hr = 3600 C of charge Q or in term of Energy E = Q*V = 26V*3600C = 0.0936 MJ).
Now comparing to propane:
44 A*h/day = 44 A*h/day * 0.0936 MJ/(A*h) = 4.1 MJ/day
A 20 lb tank of propane has 422 MJ of energy of which 50% is lost heat. So 422 MJ * 0.5 / (4.1 MJ/day) = 51 days. This implies that every 51 days of induction stove use saves a 20 lb tank of propane.
I'm assuming that Delos is keeping some propane for a grill (or combo range?). Got to have a BBQ.
Ha Ha, glad you appreciate my attempt at a little nerd humor :) . So you are actually pretty spot on with your thinking and calculations. The next video (next Weds) will cover some of this, but I can give you some numbers now. The Induction HOB is rated at 1800 watts for both elements. We found that when on max power one element pulls about 47 amps @ 24V, so about 1,200W. On this model you cannot run both at full power.... So far we haven't used it very much but I did cook a curry dinner for 15 people (big curry pot, big rice pot) and found the entire meal used 66 AH @24V. And I think simmering curry and cooking a big pot of rice is quite a work out for any stove. I would have been boiling in the galley but it actually did put off way less waste heat.
Our normal propane usage on Delos is one 5KG bottle per month, given we have so many tea drinkers onboard :) We'll keep track and figure out what the conversion is but your numbers seem pretty reasonable. You know what, they actually gave us an electric BBQ as well. I'm not sold just yet but we will give it a shot...... Fair Winds! Brian
I am looking forward to your discussion on the induction HOB. If one has the spare amp-hours in the bank then I see many potential advantages. It is great to see Delos leading the way.
Here are some values which may be useful for future comparisons. Energy density of propane = 46.5 MJ/kg. A monthly 5kg propane bottle is theoretically equivalent to 46.5 MJ/kg * 5 kg/month * 1 A*h /(0.09 MJ) = 2,583 A*h/month at 25V. Taking cooking efficiencies into account gives a more realistic amp*hr equivalent of 2,583 A*h * 50%/90% * 1month/30days = 48 A*hr/day @25V which is also 1,200 W*h/day.
That was the easiest explanation I have heard. Great job! Looking forward to the follow-up "voltage input" session :)
Excellent. Delos is a big boat but you have a pretty reasonable power draw considering how many people are on board. You didn't mention the power on the water maker?
Need to run gen set or engine to produce enough ams to power the high pressure pumps. Guess at least 1 horse power motor to pump the salt water up to 800psi
Scott W ,correct
Yea, i think i remember them saying that too. i think whenever they run yhe generator to fill scuba tanks they run the Heavy stuff , watermaker etc.
ScubaTony Anschutz or the power draw on the distiller, assuming its using electricity over fire.
Phil The Farrier we run our watermaker off the batteries along with air con😘
Loved this one. As a physics teacher and sailor, I can say you really explained the concepts clearly and understandably. Keep em coming!
Good vid ! An Easier to understand formula is Amp x volts = Watts. and Watts Devided by either amps or volts will give u the other. The P = i x e junk formula is not helpful. just alkways driven me nuts. Volts are measurable with a volt meter. Amps are Measurable with a Voltmeter that has a amp clamp on it ( around $100.00 us ) and once u have the measured amps and volts = The wattage. Also Remember as Load increases so do Amps. So , If u Take a Serious Dump , That Little Shit dumper motor can draw alot of Amps up to 4 times more than Just a Water Flush. So, remember to eat your fruits & veggies.
Brian is so smart! I would not go out to sea with ANYONE else!! I would trust the Delos Crew with my life. TAKE ME WITH YOU😍
i Don't Know if u Guys Have ever thought about it, But u could Build a Beast Rendering Desktop computer or Server on board to speed up Your Rendering. You could just find a Place to Bolt down a Motherboard somewhere, Put in a Beast Graphics card ( maybe like a 1080ti ) it would not need to be in a Case & take up all that Room. Or u could buy one Allready Made and Take it apart and Spread the pieces out to save room.
Boats get pretty wet at times - wouldn't that mean things would forever be shorting out?
Great info Bryan you are a nerd, my son is just like you,
I love watching your channel, Im fighting cancer for the las 2 years and 3 months, I found you and I ve been watching you guys for the last two years, I bought stickers a hat and a shirt beautiful thanks and keep up traveling showing us the world, cant wait to see your next video, God bless you all,
Wishing you all the best, and sending good vibes your way Jesus. Brian
Why use amp hours when it is misleading if you don’t know the voltage? Many people use amps instead of watts or kilowatts because they assume the voltage is 12 but your battery system is 24 volts. So any amps you use would be 1/2 the power you are actually using if people assume 12 volts instead of the 24 volts you actually have. My suggestion is just use watts and watt hours and then the voltage doesn’t matter and watts is actually the correct unit not amps. Appliances are normally rated in watts and with just a small deduction for conversion the watts will work whether AC or DC. I know many people use amps and amp hours incorrectly but if a few people influential boats only say watts and kilowatts maybe we can get people to use the right units.
If you use only the top 50% of your battery bank, why not just say you have 9.6 kilowatts instead of the 19.2 kilowatts you actually have. Use your useable watts rather than your rated watts that you can’t get without damaging your batteries.
Cause deep cycle lead acid batteries are rated in amp hours and that's what he is talking about here.
Don't assume
that would be kWh and not kW to measure the "size" of batteries (mixing power and energy units is also all over the place ...)
Yes you are correct, I think that measuring in WH is a much better way, but alas all batteries and meters sold measure AH....
I think it might change with the electric cars getting more popular : the batteries voltage are very varied, so it looks like the usage of Wh or kWh to define their capacity is generally used, also the case for torqeedo, see for instance : www.torqeedo.com/en/products/batteries
A very informative and accurate explanation. I'm very impressed that you understand the subject matter that well. I'm not easily impressed. I've worked professionally in Electronics and all the other things that go with it since graduation from college in 1970. Most people I run into just don't understand the mystery of electricity and electronics so when I find someone like you who understands and is even able to explain it as well as you do, I get very happy and impressed.
I heard from Capt Rick Moore of Sophisticated Lady that you have switched from lead acid batteries to lithium-ion batteries. A word of caution as I explained to Rick, lead acid batteries have a typical life span that is 2 - 3 times of lithium-ion batteries which makes lithium-ion a very expensive trade off. Also because of the massive power storage of lithium, lithium-ion batteries are a serious fire danger if they become too hot. I would recommend using a combination of lead acid and lithium-ion batteries and put the lithium-ion batteries some place where they can cause minimum damage if the do catch fire. Also keep a fire extinguisher that is capable of putting out all types of fire some place it can be quickly accessed and near the batteries. At least a 5 pound and possibly a 10 pound extinguisher would be recommended.
Mac rules!
When they work. When not... see: ruclips.net/user/rossmanngroup
If you think so , DONT watch Louis Rossmann's RUclips channel lmaoo he will burst your Mac bubble in a hurry.
actually Brian forgot that the mac uses the battery not the power from the outlet ... and they probably have very different specs as well , he probably has a i7 and her an i5 or i3
That's a good point, only way to really test is to remove the battery from both. Can you remove the battery from a Mac?
there is a difference of idle and on load for computers. Idle on a desktop could be under 100w, but under load could be 500w.
So much of an easier explanation/class than most ever do. Its like it has "real world" stuff in this class. Made a heck of a lot more sense to me out of that 12 minutes. Thanks Brian!
Time for a lithium upgrade
Ha I see Battle Born has the following kit, looks like you are getting an upgrade soon,
SV Delos 400ah 24V LiFePO4 Bundle
Thanks for continually brightening my day ....Peace and fair winds Delos ....
Great video. Very informative. You'd make a great school teacher Brian. I never tire of seeing you and Karin and of course, Mr Brady and Blue. Take care.
Enjoy Delos and was just pondering this exact question as I piece together a system for a solar powered trolling motor on a small launch. Thanks Capt Brian!
Yup, this was a nice surprise. The mechanic engineer in me perked up. Thanks for the video Capt. Sure the rest of the crew benefited too😁
Great job guys!! It certainly is a question we get a lot and you've explained it very well!!
Paul & Sheryl
SV Distant Shores III - Gibraltar
Thanks guys, so good to hear from you :) I would love to pick your brain about your experience with shallow draft keel options. I'll try to send you a FB message and see if we can connect that way. Fair Winds! Brian
Like hearing about the practical nuts & bolts hardware real life concerns of making it work for your needs. I think these kinds of things help novices or those less familiar with tech backgrround help to grasp these important concepts. Also, making dedicated videos for these topics is good, that way of you're not interested you can skip, and if you are, the info is concentrated and easy to find. I like that you link a lot of this stuff at your "about the boat" area too, a logical way to find it. Thanks Brian!
Your water usage analogy made this clearer to me than it has ever been - excellent and easy-to-understand example. We're in the process of acquiring a boat and thanks to you I'll be doing a power usage analysis hopefully soon...
I am impressed with your knowledge of the equipment you use. Your explanation of AH's and what they are was the easiest to understand definition I have ever heard. Very well done Crew, cause I know Brian didn't do it alone, and thank you for the video. I like the craziness of your series, but it's nice to see the maturity, and understanding of what surrounds you. I like it, Iike it a lot! ;) fair winds.
Thanks for doing a technical one, I came to this channel when you were doing lots of work on the boat and have missed these sort of videos.
Brian = Smart! It was an awesome comprehensive lesson. Felt like being back in first year electrical in engineering school. Well done and very helpful.
Way to go captain Breyyawn! Do more of these short videos. The main videos are a lot of editing and require a significant amount of time to make, but there are lots of interesting short bits you could share that would be interesting to your fans. Thanks!
If there's anyone I want to be taking advise from, it's you guys! Thanks for making this informative video. Hope you'll talk about your solar and wind power generation, in your next one.
I love to hear the technical aspects of the boat as much as seeing the evading places. If it's all "fantasy" world then it doesn't seem real. I know there are issues to solve on boats if we're to live the dream so knowing how to solve them helps immensely. More of these please, they help bring it a little closer
Thanks so much. These are the videos I enjoy most from you guys. You are getting amazing with your cinematography but I will always enjoy these the most. Brian's background in engineering and Brady's diving experience are something I would like to see more of. I love watching Brian make these sorts of videos packed full of information but maybe Brady could do some as well. Maybe he could throw out some tips to make us better divers or go over your scuba setup that you have on the boat. Thanks for sharing all the wonderful information, love you guys!
That was great, Brian. The level of detail and explanations was excellent. Thanks!