Testing a New LiFePO4 BMS, 12v Battery Build and Aliexpress Cell Test
HTML-код
- Опубликовано: 24 авг 2024
- Cells and BMS in this video: www.mobile-sol...
Design your own 12v raw cell system: www.mobile-sol...
Does off-grid solar confuse you?
Check out my DIY friendly website for solar system packages and product recommendations, and so much more! www.mobile-sola...
Join our DIY solar community!
#1 largest solar forum on the internet for beginners and professionals alike:
www.diysolarfo...
Check out my best-selling, beginner-friendly 12V off-grid solar book (affiliate link):
amzn.to/2Aj4dX4
If DIY is not for you, but you love solar and need an offgrid system, check out EnergyPal! They will price out a system and get your house offgrid: energypal.com/...
My Solar Equipment Recommendations (Constantly updated! Check here first):
12V/48V Lithium Batteries: www.mobile-sol...
Solar System Component Directory: www.mobile-sol...
Complete 48V System Blueprint: www.mobile-sol...
Plug-N-Play Systems: www.mobile-sol...
Complete 48V System Kits: www.mobile-sol...
DIY Friendly Air Conditioner/ Heat Pumps: www.mobile-sol...
My Favorite Online Stores for DIY Solar Products:
Signature Solar
Offgrid One-Stop-Shop. Best Value 48V LiFePO4, Victron and Offgrid Specific Heat Pumps:
www.signatures...
Current Connected
SOK, Victron, Mr.Cool Heatpumps and High Quality Components:
currentconnect...
Ecoflow Delta
My favorite plug-n-play solar generator:
us.ecoflow.com...
AmpereTime
Cheapest 12V batteries around:
amperetime.com...
Renogy
A classic 12V solar store that has been around for ages!
renogy.sjv.io/...
Rich Solar
Renogy's biggest competitor! Similar products, but at a better price:
richsolar.com/...
Battery Hookup
Cheap cell deals
bit.ly/2mIxSqt
5% off code: diysolar
Contact Information:
I am NOT available for personal solar system consult! If you wish to contact me, this is my direct email: williamprowsediysolar@gmail.com
Join the forum at diysolarforum.... if you wish to hang out with myself and others and talk about solar
FTC Disclosure Statement and Disclaimers:
Every video includes some form of paid promotion or sponsorship. Some links on this youtube channel may be affiliate links. We may get paid if you buy something or take an action after clicking one of these. My videos are for educational purposes only. Information is subject to change/update at any time. Electricity is DANGEROUS and can kill. Be smart and use common sense :)
DIY Solar Power with Will Prowse is a participant in the Amazon Services LLC Associates Program,
An affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com
I set my freezer to -18 degrees Celsius for this test. Tested Daly BMS for hours to ensure that my results were correct. I have found 3 other BMS on market for LiFePO4 that have cold temp cut off, but with varying cut off temperatures. so these results are unfortunately very common. And if you wish to learn about cold temperature charging and discharging, check out this battery study: www.ncbi.nlm.nih.gov/pmc/articles/PMC6126518/
Update: Also tested one more time, with salt water dropped to -20C! Did not disconnect. Other BMS triggered instantly. The Daly does not have it. For sure
~~~~~~~~~~~~~~~~~~~~~~~~~~~
Does off-grid solar confuse you? Check out my DIY friendly website for solar system packages and product recommendations, and so much more! www.mobile-solarpower.com
Join our DIY solar community! #1 largest solar forum on the internet for beginners and professionals alike: www.diysolarforum.com
Check out my best-selling, beginner-friendly 12V off-grid solar book (affiliate link):
amzn.to/2Aj4dX4
If DIY is not for you, but you love solar and need an offgrid system, check out Tesla Solar. Low prices and great warranty, and they can take your entire house offgrid with their new Powerwalls: ts.la/william57509
~~~~~~~~~~~~~~~~~~~~~~~~~
My solar equipment recommendations (Constantly updated! Check here first):
12V/48V Lithium Batteries: www.mobile-solarpower.com/solar-batteries.html
Solar System Component Directory: www.mobile-solarpower.com/solarcomponents.html
Plug-N-Play Systems: www.mobile-solarpower.com/full-size-systems.html
Complete 48V System Kits: www.mobile-solarpower.com/complete-48v-solar-kits.html
DIY Friendly Air Conditioner/ Heat Pumps: www.mobile-solarpower.com/solar-friendly-air-conditioners.html
Complete 48V System Blueprint: www.mobile-solarpower.com/48v-complete-system-blueprint.html
~~~~~~~~~~~~~~~~~~~~~~~~~~
My Favorite Online Stores for DIY Solar and Coupon Codes:
-Current Connected: SOK, Victron and High Quality Components. Best prices and warranty around: currentconnected.com/?ref=wp
-Signature Solar: Cheap Server Rack Batteries and Large Solar Panels:
www.signaturesolar.com/?ref=h-cvbzfahsek
-Ecoflow Delta Official Site: My favorite plug-n-play solar generator:
us.ecoflow.com/?aff=7
-AmpereTime: Cheapest 12V batteries around:
amperetime.com/products/ampere-time-12v-100ah-lithium-lifepo4-battery?ref=h-cvbzfahsek
-Rich Solar: Mega site and cheaper prices than renogy! Check them out:
richsolar.com/?ref=h-cvbzfahsek
-Shop Solar Kits: Huge site with every solar kit you can imagine! Check it out:
shopsolarkits.com/?ref=will-p
-Battery Hookup: Cheap cell deals
bit.ly/2mIxSqt
10% off code: diysolar
-Watts 24/7: Best deals on all-in-one solar power systems, with customer support and distribution here in the USA:
watts247.com/?wpam_id=3
~~~~~~~~~~~~~~~~~~~~~~~~~~~
Contact Information:
I am NOT available for personal solar system consult! If you wish to contact me, this is my direct email: williamprowsediysolar@gmail.com
Join the forum at diysolarforum.com/ if you wish to hang out with myself and others and talk about solar
FTC Disclosure Statement and Disclaimers:
Every video includes some form of paid promotion or sponsorship. Some links on this youtube channel may be affiliate links. We may get paid if you buy something or take an action after clicking one of these. My videos are for educational purposes only. Information is subject to change/update at any time. Electricity is DANGEROUS and can kill. Be smart and use common sense :)
DIY Solar Power with Will Prowse is a participant in the Amazon Services LLC Associates Program,
An affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com
Hi, Will thanks for more great content, but can I give you a pointer? When testing multiple cells to see how they are balanced with each other, did you know testing them at 3 - 3.4v will not actually give you an accurate reading? Multiple cells all testing at 3.20v could actually be 10 or more % different in capacity but with the voltage curve of LFP it won't actually show up testing by voltage unless the cells are almost full or almost empty!!! Let me know if I am incorrect on this! Thanks
@@Millertechenergy Great question. So yes, charge/discharge curve is relatively flat. If you wish to top or bottom balance for your application (check out my in depth videos on this), you need the cells at an extreme soc to accomplish balancing (or putting them in parallel for a few days). But, when cells are brand new, voltages have settled, and you have not connected any loads or chargers, and the voltage difference for all cells is less than .005 (which is stated in some bms manuals), then you know that the cells are at similar SOC. This is not true if the capacity of the cells is not matched, or if you have large loads on the battery and some of the cells are damaged (aging/heat or cold exposure while heavy cycling)/have different internal resistance and not being matched properly etc.
And that's why we do a capacity test in every video. If the cells were not matched, or at different SOC, we would instantly be able to tell from our capacity test results. Watch my 120ah aliexpress battery video to see how we spot a bad, lower capacity cell. or my older videos covering this in much more depth.
@@Millertechenergy If cells are matched properly, and voltage is the same, and capacity test results are good, and battery cell temperatures are similar during testing, and wired correctly for test, then you know that the cells have similar capacity/internal resistance etc.
Why not put the entire battery etc into the freezer?
@@TheGoldeyFamily Because they will be damaged instantly. I need the sensor to trigger bms for the test and that's it. These packs cost 400-600 bucks. I do not want to waste my money destroying perfectly good cells
This is the greatest channel on RUclips. We appreciate you very much.
The more I watch your videos the more I want to build my own battery bank.
Happy new year Will.
You have never let me down with a review.
Your testing methods are consistent and well thought out.
The manufactures are the ones who let you down...... over promise and under deliver.
You are my go to guy for all things solar.
thanks Will, Happy New Year
A super big thank you Will and you are such an amazing contributor to all us who just want to build/make our own....
Really appreciate you using metric units Will.
Order up an assortment of threaded studs, washers and nuts. You will have full thread into the battery and proper length for double buss bars if you desire .
When you brought out the bag of frozen bananas, I fell off of my chair!
A can of freeze-mist would work, too, but it wouldn't be as much fun.
I tested costomized dally BMS Low cut off temperature and it worked fine. I asked them to set for cutting off in low and high temperature and fortunately both of cutting were acurate at 0 and 55 degree
Will YOU have never let us down. The manufacturers have and YOU prevent us from loosing money and you do it for FREE here on YT and on your forum. We all can’t say “thanks” enough!!
"I'm not sponsored" makes you the gold standard of solar power RUclipsrs!! :)
who knows
Please stop. If YOU were a RUclips creator and received a free product for testing would you immediately toss integrity out the window? In so doing become the enemy of truth, justice and the American way? Watching videos you can tell who is smitten and being swayed by a gift. Get real, stop assuming the worst of anyone reviewing a free product and STOP spreading the misconception that everyones' vote can be bought. Thank you very much....
@@geraldhenrickson7472 if you don't disclose that sponsorship or free product yes that makes the person a violator. It is a strike against the person for not buying the product to test even if they disclose.
Hey Will, just wanted to thank you for your excellent videos. You are an absolute natural. I'm old, senile and dumber than a bag of hair but the more I watch the more I glean even if only through rote. I wish I could sit with you for just an hour and have you design a system for my little cabin up here in the southern Sierra's. Love your passion. Love your sincerity. Thank you brother.
lookin' forward to hearing how Daly responds
Well it started out promising. Maybe next time.
Over/under on it being a unit failure. Maybe they rushed a prototype run.
lol if it turns out to be a bunk temp probe
I have a screenshot of their message and data sheet, both stating the low temp cut off, and it's ready to go. And I just tested with frozen salt water and it did not trigger. I can't wait to show this on the AliExpress dispute.
@@WillProwse optimal outcome is finding out the feature is winding through their supply chain and you just got an older firmware or something; i really doubt it'd be documented if it wasn't being deployed but theres definitely opportunities for mistakes in a rollout
def interested in their response
You dont have to worry about letting us down, dude. Just keep keeping it real and keep teaching, you doing a great job.
The Daly Spec on Ali says " [chinese] 50C [chinese] >70C [chinese] " - Then later on "Temp Protection Temp Protection NA ℃ Set as required" - I presume that the setting is firmware or trim pot? Wish I could read Mandarin -- I'll ask my neighbor what it says. ;-) - (Maybe you should have used frozen Mandarin Oranges) Also, are there other options for LTC besides the Victron? Great videos - your enthusiasm is refreshing!
No, Will, the product has let us down, but your integrity has never! When the product was NOT what they claimed, you said so up front! You are very reliable.
Fantastic option for us car stereo guys! 100ah in the size of a lunchbox? That is insane! No competition guys are doing this yet!
You should review one of these expensive BMS, for comparison. The Orion BMS Jr for instance. Also I’m interested in BMS that allow for separate port and external relays for disconnects with heavy amperage loads. It’d be cool if you could cover these types of installations as well.
Your channel has been getting better and better, and more thorough. Congrats!
have you tried to build or have someone build a low-temp cut-off? I envision a small PCB with a temp probe, to go inline between the charger and the BMS/battery
Great Channel. Quickly becoming my favorite. While I wished the Daly had worked, it reminds me that when you buy something to protect an expensive investment, there is no substitute for testing.
I eagerly await your reviews and builds. You have opened up the world of solar energy for me.
Hey Will, I've enjoyed your vids. I've learned quite a bit watching them. I'm an elevator service technician and no stranger to electricity in general but not so much in the systems associated with solar, ( charge controllers, bms and such). Very good info, thanks. By the way, the bolts for the buss bars can be easily and cheaply replaced with appropriate hardware for Ace Hardware, among others. I would use a peice of threaded rod cut to length then you can use multiple nuts and washers to mount the buss bars and stack the bms leads right on top and fasten with another nut. Just me.
Sure, but the question is, what are the conductance characteristics of the typical galvanised threaded rod you buy at a hardware store?
you can use bimetal NC thermostat 0 or 5 deg C (for low temp cut) with another 60 deg C one, for high temp disconnect :) and connect it in series with random cell sense wire, and you are done.
I would like to see this
I once replaced a BMS in a 48v ebike battery pack. The BMS was smaller than a playing card and maybe 3/8 inch thick. That BMS at the start of the video was ridiculous. The problem is that you really want 48v if you are looking at running anything over 1000 watts. The ebike pack would handle 30 amps, so around 1500 watts. Easy enough to find a 48v inverter.
I think we should all chip in and buy Will a cheap dirt bike like the CSC TT250. That's what people do in Vegas, testosterone laced pleasures... Used to live there, moved up the road to Southern Utah. Glad you got out of Cal.
Thanks Will! We make our buying decisions based on Chanels like yours. Please tell Dali! WE ARE WATCHING YOU!
Hey Will, I just set up my Daly smart bms with 280ah batteries on the kitchen table for top balancing. I noticed on the Daly app that the low temp. Cutoff was set for -40C !!! Maybe this has been the problem with the Daly low temp cutoff? Thanks for all your great videos Will!
That temp sensor is a thermal resister, you could change the resistance with a potentiometer to adjust the shut off point. I think a better solution though is a heat blanket that turns on.
It seems like a better idea IMO to be vigilant about the environment and BMS cutoff would be a last resort
Id take those smaller cells over the larger ones any day of the week, I use that bms you showed at the end, its amazing, it does disconnect in low temps, witch can damage your solar system, cause your never supposed to have the solar panels connected to a charge controller with out the battery being hook up. it can kill the charge controller.
So the low-temp disconnect must interrupt the PV line (which connects to the chrg ctlr) rather than the battery line?
BTW, GOG (one of my most favorite sites ... and cites, too, I suppose), I know that you use the Midnight Solar charge cntlrs which have a BTS line ... Does that obviate a separate low-temp diconnect?
@@mikegardner9855 yes the midnte bts can be used to save the system
@@GoingOffGrid101 Thnx! (Amazed that you replied so fast! Love sharp knowledgeable folk! ... Got double value here today!)
Where did you buy it, and were you able to get a bluetooth app for a smartphone in english?
I do not feel let down at all. I am glad you did the actual test so I won't have to. Happy New Year man.
I am glad you are honest.
The problem is, you tried to cool the temp sensor with frozen bananas and you clearly have the frozen asparagus model. The spec sheet says they are not compatible with each other.
You are doing a good job Will
Will, you can make your own adjustable low temperature disconnect to your charging circuit....just glue a microswitch to a bi-metal coiled strip, and feed the leads to a relay or solenoid big enough to handle the charging amps. The bi-metal coil can have an adjustable knob to rotate in both directions to tweak the temperature cutoff requirements. cheers and happy new years!
I like this man he explains everything so well,,,in my mind he knows all about solar,and he teaches me everything i need to set up my own system,thanks,Will,,,,,,
when i meet Will i will give him a $100 bill so he can go buy him a hamberger for lunch,
Having just had a frozen banana and berry smoothie, I fully endorse the appearance of frozen bananas being utilised for BMS validation testing purposes. Good stuff Will.
Will, thanks for all you do to educate us about these batteries and solar systems. I will be building a system for my RV soon and these cells look great, but without the proper safety in place looks like I'll be using Battleborns. Can't have my home burn down ! or throw money away on crap that doesn't work....or last.
Have you tried glass fiber tape? Use e tape first for a little clamping pressure and then some glass tape for a rock solid build.
It doesnt stretch so it should keep the cells all in line.
Happy New Year Will! Wishing you the best in 2020! Love your channel and the info you give. Rock on!
I wonder which is more damaging to the internal structure of the battery, to confine any would be expansion and subject the cells to the inevitable mechanical pressure that causes, or to lengthen the bus bars so a dense foam can be inserted between them, allowing the expansion to reduce internal pressure.
"... So the temperature sensor is in frozen banana water..." LMAO!!!
That should go down in the annals quest for scientific knowledge.
This is why I love learning from you.
Thank you for just being you!
O.o thanks for saving many folks a sheet-ton O'Grief.
I would certainly have been devistated with the loss of batteries.
Looking forward to your review on the new 280ah cells that are now available! Keep up the great work!
NOW I CAN GO INTO THE NEW YEAR !!
No let downs from you brother youre great
Happy New Year Will👍 and all. Looks like solar in our future will improve sharply.
Happy New Year - still enjoying your energy and info
Bummer on the BMS tell them their losing business from your followers on your channel and your website if they could come through.
give them hell buddy!
I found some 60 AH 4 Lifepo4 cells. With bus bars and frame around them with handles for $250. I got 2 for total of 24 volts. Checked the cells and they were very close to the same voltage. I am replacing 4- 12v 17AH batteries that were connected 2S2P in an UPS! I have not found a BMS that even looked good paper. 3.75 volts for High voltage cut off I think is high. And 2.2 volts is lower than I want to go. That times 8 cells is 30 volts. I have been looking for a chart to go by for the best cell voltage for high and low for the best battery life. I am sure that the Lifepo4 cells will work better than the gel cells that were in it to start. I don't think the UPS will over charge them but may over discharge them. Just need to add a battery discount.
I really enjoy and appreciate your videos, I learn so much from them. Happy New Year!
Try over temp cut out
Great, thorough, honest review- as always. Keep up the great work.
Best new year's gift. A video from you
Will, Do a video on how to charge LifePO4 batteries with a adjustable bench top power supply.
You Rock Will!! Always Calls them hows you sees them!!!I love that!!!
On the -5 degree celsius cut off: I have come across several Chinese Lifepo4 batteries that can be charged at -5 degrees C. It may be designed specifically for those batteries.
I’m getting ready to build a battery, but waiting on your review of the BMS you mentioned at the end.
Yeah me too! and where o get an app for it in english!
If you are worried about stripping out the threads, I would suggest using a stud and a nut.
Until a better solution is found, I will warm my batteries with a heating mat. I use a Tesla battery and that is the only limiting factor. Thanks! And Happy New Year!
If you want to use thicker buss bars, find longer screws/bolts...
Simple solution.
Thanks. BTW you have never let us down. Great channel!
"frozen banana water" this dudes' pretty cool.
Thanks for doing this vid!! I've got a 4x pack of these exact 105ah cells coming that I bought way back during the Aliexpress black friday sale. FedEx finally confirmed shipping them last Saturday.
how much were they at that time?
@@scottf4277 less than $400 shipped!
So my 105ah LiFePO4 cells came today and I can confirm Will's appraisal of them. While they are top quality cells, they have laughably light duty M4 terminal screws. You will have to mount these together extremely well because any movement that would cause stress on the terminal screws would likely cause them to strip.
Hi Will. Low temp cut off doesn’t really worry me (Sydney Australia). Probably more concerned with high temp cut off - LOL - 45degC under my pergola yesterday. Anyway it should be pretty simple to install a low/high temp cutoff. A simple circuit with a thermistor. The only issue is you don’t want to switch high current so it makes more sense to me to switch the charger on and off rather than the BMS. A lot of chargers come with an external temp port anyway. Not sure if you can program low temp cutoff though.
Canned air will cool down sensor or electronics cleaner.
I wish you a happy new year, Will!
...how about a complete instruction on 24v DIY solar set up with everything that you recommend including panels, cables, controller, bms, lifepo4 cells etc etc, a complete set up you tested and recommend? Yea I learn more from your videos and I get more lost lol
Y K You know he wrote a book on that and you're now asking him to give the info to you for free?
Bent Nickel
I don’t mind buying book but would it be up to date? Like he’s changed his thoughts on some batteries here n there from what I’ve watched.. I just don’t wanna think which one to get
@@30-06 The book only has 12v systems for safety reasons. This channel and my website, I cover more advanced topics. The book is great if you are new to solar. Covers the fundamentals for sizing/building a system.
@@30-06 www.mobile-solarpower.com/2000-watt-24v-solar-system.html is a 24v system package you can build at home
DIY Solar Power with Will Prowse
Thank you very much for your reply! I’ll order your book to support you and learn more about solar! Also I’ll look up the linked page, thank you!
@Will Prowse
Have you ever thought of making your own "Low Temp Disconnect"?
Example. You get a temp sensor(s) + Rasberry pi + an inline on/off switch connected to the battery
Do a small amount of coding.
Bada bing bada boom. You got your own Low and High temp disconnect.
Easy to programme your profile of choice for disconnecting the charge.
Can you connect only 4 out of 8 balance leads if I have a BMS with 8 leads but only 4 battery cells?
Most informative channel! Always love your videos, Greeting from Malaysia, Happy new Year Will!
Those are M6 -1.00 x10, 12 or 16 gives extra length, trick is to get as close to bottom(without touch) with Bus and BMS connectors and washer and lock washer.
Quick question, how long is the shipping taking when you order through ali express??
Surprisingly fast. Most come in less than two weeks, some take a month. Lto BMS is taking forever, but it's a very rare product, so
I understand why. Calb cells took same time as Amazon order. It was couple days.
those blue prismatic cells are case negative, and they only have that little thin blue wrapper around them. You need some kind of separator in between them or you're going to get a big fire
Dude, a video where you would explain, how you select products for example battery cells on alibaba, for what to look out for, which shippinng method you choose, ect would be awesome and very helpfull! Im a Big Fan of your content!
Why you do not want to charge when below LiFePO4 data sheet temp specs:
With the complex material system used in LIBs, the performance degradation at low temperatures can be attributed to several different sources. First, the low temperature will affect the property of electrolyte. With the decrease of temperature, the viscosity of the electrolyte will increase, which will reduce the ionic conductivity. The internal resistance will subsequently rise due to the increase in the impedance of the directional migration of chemical ions. To counter such effect, electrolytes with low freezing point were explored, and different electrolyte additives were studied [51], [71], [72], [73], [74]. Bugga et al. [51] presented a guideline for developing formulations of low temperature electrolytes during their research of LIBs for space applications. The improved electrolytes can be used in an extended operating temperature range (Fig. 2A) and were proved to be effective in aerospace batteries. Li et al. [75] also reported an optimized electrolyte formulation of 1.0 M LiPF6 in ethylene carbonate(EC)−propylene carbonate(PC)−ethyl methyl carbonate (EMC) (1:1:8 by wt) with 0.05 M CsPF6. Such formulation enabled a capacity retention of 68% for the batteries tested at −40 °C, while the ones with conventional formulation only showed a capacity retention of 20% (Fig. 2B). Specific electrolyte additives, such as lithium difluorophosphate (LiPO2F2), were also proved to be effective in improving the performance of LIBs at low temperature (Fig. 2C) [74].
The increase of charge-transfer resistance in LIBs is also an important factor that contributes to the performance degradation at low temperatures. The charge-transfer resistance of LiFePO4-based cathodes at −20 °C was reported to be three times higher than that at room temperature [76]. Such high charge-transfer resistance largely affects the kinetics in batteries. The study of LIB performance at low temperatures by Zhang et al. [77] demonstrated that the charge-transfer resistance significantly increased when the temperature decreased. The charge-transfer resistance of a discharged battery normally is much higher than that of a charged one. Charging a battery at low temperatures is thus more difficult than discharging it. Additionally, performance degradation at low temperatures is also associated with the slow diffusion of lithium ions within electrodes. Such slow down can be countered by altering the electrode materials with low activation energy. For example, Li3V2(PO4)3 (LVP), which has an activation energy of 6.57 kJ mol-1, showed a 200x improvement of apparent chemical diffusion coefficient of lithium ions over LiFePO4 (LFP) with an activation energy of 47.48 kJ mol-1 at −20 °C [78].
Another typical effect that occurs at low temperatures is lithium plating [79], [80], [81]. The cold condition will trigger the polarization of anodes and lead to the approach of the potential of graphite and other carbon based anodes to that of lithium metal, which would slow down the lithium-ion intercalation into the anodes during charging process [82]. The aggregated lithium ions are thus deposited on the surface of the electrodes, which causes the reduction of the battery capacities. Furthermore, the lithium plating exists in the form of dendrite, which may penetrate the separators, and result in the internal short-circuit [83].
Hey Will, you are amazing at all of this. Im sure this has been asked, but Im new to your channel and looking into off grid RV living. So..is there a system..or 2..that can be setup with solar/batteries and all, that can totally run everything in an RV? Im sure I would need several panels/batteries and all, to run everything from fridge, ac, microwave, tv..etc. Im sure It would run several thousand $$. Im looking to be completely off grid and use solar with batteries, propane, and a large fuel genni. Is this too much of a long shot?
Yes, most of the energy for RV living can be supplied with solar but very few accomplish it. First take the A/C off the roof and install a 5000 btu window mount unit. Then use the roof space the roof A/C unit was using for as many solar panels as you can. And a big panel on the roof of your truck too. It takes about 1350 watts of solar to run the 5000 btu A/C and other loads.
Unfortunately RVs need to be modified for a quality solar energy system. There’s too much junk littering the roof is a main issue (antennas, skylights, vents, A/C, etc).
Consider buying a coach that has lots of roof space.
A lot of people have some solar panels placed on the ground to supplement the roof solar.
I wonder if the temp sensor is for over temperature? Maybe they mistranslated something?
Thanks for the great tests Will!
Best videos on the Net. Happy new year.
If you put some ice cubes in a cup of water with salt you can get the temperature down below 32. Just having iced in a cup might not push the sensor past its cut off point. The BMS with the Bluetooth I've been using a few of them and have had my ups and downs like no manual but I work through the problems one was the wrong computer program I need Windows 8 or older you can click on my profile picture and find my video on them. I enjoy your enthusiasm
Ruins the taste of your banana smoothie though, thanks for the lesson in high school physics. Useful for those who didn't listening in school or who were never lucky enough to have a decent schooling. But somehow I doubt if many of them are reading your comment.
@@johnrhodes3350 your brother Fender makes one of the best piano, the doors Rider on the Storm would be nothing without his piano.
Brilliant channel.
Unfortunately its called returning custom if the bms had every fail safe and buikt like tanks they would sell alot less product.
Mahalo for all the good info, I am building a solar electric boat on Kauai and will be building my own battery so I am very interested in what you are learning... keep up the good work and aloha!
🤣My freezer drawers are full of frozen bananas since I got them from FOOD SHARING for my pigs for free. I had a good laugh for what they can be used too.
Greetings from Germany 🇩🇪 and Happy new year
You do know they make temp controlled circuit boards that can be used to cut off anything thats plugged in right and turn back on once it reaches a temp you set for it to turn back on so in essence making all of them temp controlled
You should take that Daly BMS apart and make sure they just did not miss a solder or something
2 things:
1- why does the webpage listing for these batteries imply charging below freezing is ok “Charging Temperature：-5~60°C“?
2- does the data sheet for these type of batteries have recommended torque values? If so, why not invest in a torque wrench - you’ve made such a nice tool collection in the last year. You can get a gauge that attaches to a standard socket wrench as well.
I’ve really only worked with lead acid in large facility UPS systems but those batteries have very specific torque requirements.
I'm pretty concerned about your treatment of the bananas. I heard a banana scream when I put it in the fridge, then when I pulled it out it was black, really really black, like it was possessed. :)
All the best for 2020 Will and for all your viewers. These tests you do for us are brilliant, informative and entertaining, so thank you. It looks like you are also helping steer many manufacturers towards developing and selling better products, so double thank you!
Will, please keep hacking away at that Bluetooth capable bms. Sounds very promising and would be cool to have a dali alternative if you can get it to work!!
I love he keeps saying he's using electrical tape just for the test and just leaves them that way.
Bookmarked.
I like these cells better than the calB
Hello. I watch your movies with LiFePo4 batteries and I noticed that you have a lot of knowledge about them. Can you tell me what happened to the BMS because I don't want to connect via bluetooth? Is it possible to restart it somehow? Maybe I accidentally made a short circuit. I have made the connection to the cells correctly. when I connect the LED lamp it barely lights up. Please help and thank you in advance.
thanks for your very helpful video's
there seem to be new daly generation 4 smart bms on the market with integrated cooling fan. they promise a lot.
also with low temp disconnect
maybe you can test one of those please.
Happy New Year!
I've just gone through my local hardware store got went to the stainless steel screw section in the boxes on the wall and got the metric screws I wanted in 10 mm socket and there's multiple thread dips it's no big deal to get the longer bolts
I really appreciate your body of work. I'm an avid watcher, but seldom do I interject. What I'm looking for is an answer on whether it's ok to build a 100 AH 12 volt LiFePo4 battery assembly, then start using it with my solar set up, then, as I can afford to buy the components, build another assembly exactly the same, but two months later. By this time the first assembly has 60 cycles on it. I would then balance out the first 12 volt assembly with the second, that I wired in parallel. Now I have a 200 AH 12 volt LiFePo4 battery assembly. Two months later, do the same thing again, now I have 300 AH 12 volt LiFePo4 battery assembly, and continue this until my battery bank is built out. My question is at what point does this become a bad idea, because now I have a 12 volt parallel assembly of 12 volt batteries with an advancing cycle count on the first to the second, third, and forth, and so on. I want to do this, but I'm hesitant. Any thoughts on this?
Great video! I have an idea to improve your temperature measurements. You cannot use an IR temperature measurement reliably on water or other reflective surfaces (metal). As the surface emissivity changes, IR measurement cannot measure accurate absolute temperature. Instead you should use a temperature sensor that has direct contact. You can get cheap thermocouple sensors from AliExpress. They are small, and have low thermal mass. Not the most accurate sensors, but should be fine here. If you want to check their calibration it's easy. Prepare an ice bath with clean water, and you will get exactly 0°C. Then boil water and you will get exactly 100°C. For even more accuracy than thermocouples, look into PT100 sensors (aliexpress).
Cool video, please where did you get the battery from, is not in the description.
is there an video how to build a proper Case for it?
I'd like for you to stick a toothpick into the cell's terminal, and report it's depth. That would give an idea of how many threads are available in the cell.
Will. Your videos are awesome! Why don’t you crack the case on the BMS and see if the LTC sensor lead is actually connected to the PCB? I suspect that there is not a temp sensor built onto the PCB itself since sticking the whole BMS in the freezer didn’t yield positive results but unless the temp sensor leads are soldered onto the PCB, the connector could have come off in shipping? You could also measure the sensor by cracking the case too. Just giving the manufacturer the benefit of the doubt and I’m curious.
Is there a BMS with a low temp cutoff, that instead of switching charging off, dumps the charging into a heater, to heat the batteries?
The screws should be standard M4 threads, easily available in different lengths
if you fiddling with those batteries and power electrics just buy a torque wrench, that way you can always tie to spec the terminal bolts...
I cant find them for sale but if the temp is lower that might be what is happening id try something colder like the duster upside down would probably be easiest but you could probably use like a TEC or something too