"If you can't explain it simply, you don't understand it well enough." Will I ever make a DIY battery? probably not, but your teaching on this subject is phenomenal. The way you can so easily communicate what is going on is incredible and had me watching the whole video. Great work sir

@DavidPozEnergy

4 ай бұрын

Thank you for the kind comment.

@dethmaul

Ай бұрын

YES i noticed that a LONG time ago!! I haven't seen someone put my brain into words yet out in the wild lol. If you thoroughly understand it, you can find any number of different paths to dumb it down.

Oh man, 72kwh sounds really awesome, that's the realm of solar-only winter survival, pretty nice.

@PsRohrbaugh

9 ай бұрын

Or air conditioning a McMansion on southern nights 😢

@kusnezoff8705

9 ай бұрын

Now you're talking my language. It's about time you made a real diy battery pack.

@joakimcarlsen71

7 ай бұрын

quite weak winters you have there then, unless you are using gas/wood for heating. I regularly consume over 70kwhs per day on the winters, I am using geothermal heatpump. The most consumed in a single day was 140kwh, but that was with some heat fans on in the garage and a 15kwh charge of my car.

@tobiasobermayr501

2 ай бұрын

in a well insulated house you can go about 4-5 days on that yeah.

@ifyoudisagreeyouarewrong

14 күн бұрын

@@joakimcarlsen71 you wasting electricity isn't the flex you think it is

I’m a software engineer and formally a mechanical engineer and I’m super impressed. The way risks are mitigated and everything is handled shows an insane amount of skills. I love it. Really nice to see

@DavidPozEnergy

7 ай бұрын

Thank you.

"Video killed the radio star", and "server rack batteries killed the DIY battery". There will always be a few folks that still want to do it themselves for cheap :) Great job...

@DavidPozEnergy

9 ай бұрын

Good analogy.

@PsRohrbaugh

9 ай бұрын

I have had DIY lithium in my Sprinter van for 4 years and have been very happy. But now I'm doing a home setup, and want my BMS to communicate with my inverter. This is plug and play with server batteries and something like a sol ark. That's actually why I'm watching this video - trying to see comms options for DIY batteries. I need something that can work reliably with no intervention. Still making up my mind.

@JasperJanssen

8 ай бұрын

Yeah, if these modules came as 16S instead of 20S, maybe. But this is a lot of work for minor cost savings. (And I suspect the supply of these things at the current price is hardly infinite.)

Giving me ideas, Dave. My wallet isn't going to like this at all.

@billykulim5202

9 ай бұрын

when the title of video come out, i though he was going to teach us making our own lipo4 battery, i was wrong,

@KP-sg9fm

9 ай бұрын

​@@billykulim5202 wouldn't be surprised if that's the next video. Guess I should go buy a pickaxe.

@simonlinser8286

8 ай бұрын

Wouldn't it be a thing you'd be buying anyways if you need it? It's not like you're buying a video game or something you shouldn't. And if you are getting energy you'll save money paying for it, if you don't have a battery you'll need one anyways, and if you do need one buy it sooner than later because the price isn't going down anytime soon. And build your own.

@brofessormex

8 ай бұрын

That's my problem too😊

@leukota

4 ай бұрын

On the contrary your wallet will love you if you go Solar. Assuming you are grid-tied, hybrid battery backup allows for on-peak power use (outside of heavy 240V loads). You sell back more to the grid during peak, whilst running house on battery, alleviating peak rates. If you don’t have solar idk what to tell you, you either don’t fully understand the financial benefits, or you don’t qualify.

David, I don't understand why you don't have more subscribers. You are one of the top 5 battery DIYers on KZread. I have learned a helluva lot about building batteries from watching your videos. I'm not building them at the scale that you are, but I am building them nonetheless and enjoying the process.

@DavidPozEnergy

9 ай бұрын

Glad to hear the videos are helping you out.

@solarcabin

9 ай бұрын

20+ years off grid with solar, wind and batteries and I would NEVER recommend people try to build their own batteries. That requires a high level of electrical engineering knowledge and if the soldering is bad you could end up with a massive house fire risking lives. Commercial LIFEPO4 batts have a BMS matched specifically for those cells and a low and high temp sensor to prevent charging issues and fires. When you calculate all the engineering and safety measure involved in a commercial battery that has a warranty you are not saving money and could be taking huge risks!

@hansdenotter7376

9 ай бұрын

⁠@@solarcabindo you sell batteries by any chance??

@CLRH2O

9 ай бұрын

@@hansdenotter7376 HA - Nailed it!

@kameljoe21

9 ай бұрын

@@solarcabin you must be one of those people who want people to buy their stuff. Take a hike. People have been building stuff longer than you have been alive. This stuff is simple to build and do.

Thanks David. Always a pleasure to watch you complete a project.

These are the type of videos I like from Poz. Was missing them. Well explained easy for most to build their own DIY pack. Even easier if the new CATL cells are purchased unassembled. They can be had for the same money.

@Ozzy3333333

9 ай бұрын

singles showed sold out just now

@dandriscoll692

8 ай бұрын

@@Ozzy3333333 where does one commonly by the CATL cells?

Also, you've earned my subscription. You are speaking honestly, clearly learning and teaching at the same time and you're actually being very helpful in the information you've created here. Thank you for taking the time to record and share this, I can't wait to get closer to electrical freedom, it has always been a dream of mine.

@DavidPozEnergy

8 ай бұрын

Your welcome. Thanks for watching.

I recognise these modules, they are used in industrial grid connected battery storage sites. There would be multiple containers with banks of these modules. I always wondered what cells were in them!

@christopherleubner6633

3 ай бұрын

That and large UPS systems for servers and cell site transmitters. Replaced a 60v string of lead acid batteries. Those were heavy beasts... 2V and like 60 pounds a pop. 😮

Thx a lot DTG, this was awesome. It always amazes me the length at which you go to test very complicated things. You're one of the kind. Thx

@DavidPozEnergy

9 ай бұрын

Your welcome. I'm glad you appreciate the extra time it takes to make a good review.

As usual, great video David. It's a pleasure watching your DIY projects. Thanks!

@DavidPozEnergy

9 ай бұрын

Thanks for watching

David, thank you for this video specifically. I just finished a DIY 14.5kw system on my house. I wanted batteries next. I was going to do a 6pack of EG4's for roughly 8500$ I was budgeting for it for next year....then this video came along. I watched and stared at that listing on battery hookup for half a day, entered your discount code and purchased 4 of these modules. The discount code was good for 10%, which was huge considering the price. Basically I got free shipping on 1400lbs of batteries. I just recently finished building 2 heavy duty carts for the 4 packs. So per your comment in the video, I am leaving the batteries in place, and wiring up 5x 48v modules to my Sol Ark. Like you said, a little bit of work saved thousands. It's twice the storage for the same price as the 6pack of EG4's.

@DavidPozEnergy

8 ай бұрын

Sounds awesome. Thanks for sharing.

@MikeG-js1jt

5 ай бұрын

if you got "Free Shipping" that just shows how much we are being ripped by the Chinese.......

@stecder2470

5 ай бұрын

then instead of paying 9k , how much you ended up paying?

@nickfirst7249

13 күн бұрын

​@@MikeG-js1jt do the product domestically then maybe?

Your videos and skill sets have greatly grown great job sir.❤

Bought a crate plus an additional 8 cells for my solark 15k back in May, used the 300amp bms from battery hookup. Adjusted the settings in the BMS and solark. They have been running flawlessly everyday for almost a month no issues. The BMS will time out if the batteries sit for more than a day without any charge or discharge, but I load shed everyday so doesn't matter for me. Cells were top balanced and discharge and charge within 0.010 of eachother without an active balancer. $6.5k all in for 45kwh at 8 to 10k cycles what a deal.

@jl9678

9 ай бұрын

Does it accurately measure charge/discharge compared to say a victron shunt?

@michaellarosa384

9 ай бұрын

The BMS is a little off only one of the three banks is close, the solark does the SOC well and matches the amps in vs out even when I just top balanced again after 3 weeks

@GenXMade

5 ай бұрын

Would u be willing to share your BMS settings? I have a 10.2 POWMr with these bat packs. My BMS is open/closing the contacter non stop. Cannot figure out why. Any insight into how you programmed your BMS parameters would be awesome.

@michaelvanzyl8749

Ай бұрын

Where do you buy these batteries

Loved the video David. Clear explanations. Keep up the good work.

Hell of a lot better than the cost of a Powerwall!!

Well done David your content is a great help for newbies like myself to understand and see how to do set-up, cheers from Australia

Awesome Dave I'm very much inspired . The way you explain is not confusing compared to some of the other KZreadrs

David, thank you for quality content

The problem our society has going forward is we don’t have enough people like you that have the knowledge or skills to do this

@jaredlarson2810

8 ай бұрын

It’s not as much knowledge as courage, curiosity and very little fear of failure to acquire the knowledge.

@lexpox329

4 ай бұрын

@@jaredlarson2810 expendable income is also an issue for many. You can't spend money trying things that might fail if every dollar is needed for something else. Yes I know most people also don't manage their money well at all but still I just in the last year have had any extra money to buy things like tools so I can even attempt to make things myself.

$170 per kWh is what I recently paid for 64 280Ah Eve Cells, four stackable DIY metal cases (no, not made by Seplos), Seplos BMS, active balancer, busbars, breakers, fuses, wiring, tower base trolley, including shipping and taxes. All brand new kit, I had to assemble it. I did make a few mods to improve the design, which took a couple of hours per case, but then the assembly was less than an hour per case.

@gruetoo1

9 ай бұрын

Did same using Seplos case NeeeeeY Smart balancer, and cell directly from Eve. A bit more, but easier to repair if needed. I love the concept, but a bit too DIY bordering on designed by. In order to maximize the savings you gotta go for the 4 pack. But at 8k and no box no BMS I have to consider the 50ish dollar increase (per KW) to be small. I personally would do this if the price difference was at least 1,500. more. Also the server rack he is using is not cheap. So if you get some warehouse racks you can add another 500. Last note would be moving them into the racking. I don't have the lifting tables he uses. I guess I can get a cherry picker. All this to say the savings would be eating up quickly. Great Video David.

@thefirstfootprint

9 ай бұрын

If not Seplos, who did you go with? .....and was everything from the same supplier?

@KoiAquaponics

8 ай бұрын

Now this is what I want to know more of. Where do you get everything for $170kw assembled. These catl cells are amazing though. But buying everything else also adds more. Can you show me where you shopped?

@abhishekkushwaha2455

8 ай бұрын

@@gruetoo1do you have link for eve battery shop? how did you bought them directly?

@richardmarkham8369

Ай бұрын

Trevor, who did you buy from? Fogstar?

Your content is some of the best sir- thank you for doing what you do. I personally would like to see the batteries together and hear your commentary.

I’m sooo tempted to grab a set of these module after watching this video. So much knowledge in this video and presented in a fun way. Thank you for sharing, David!

@DavidPozEnergy

8 ай бұрын

Glad you enjoyed it. Thanks for watching.

I'd love a video on paralleling different types of 48V batteries! I thought it could only be done if the packs were identical?

@DavidPozEnergy

9 ай бұрын

Thanks for letting me know. It helps me plan future videos.

@PsRohrbaugh

9 ай бұрын

It's an advanced configuration, but it's absolutely possible. Your parallel banks will discharge at slightly different rates and you have to keep an eye on the charge states. The big problem is different battery chemistries in parallel - like lifepo4 and lead acid. That can be done in very specific circumstances (like a few minutes while switching between banks) but owing to the massive difference in charge states per volt, you can't leave it connected long term.

@pigbag79

8 ай бұрын

Yes, please do a video about paralleling banks of LiFePo4's. I already have a closed circuit of LifePower4's - but always wondered if I could build my own battery, parallel it in without confusing the inverters in the closed system, or if one bank would spend most of its energy recharging an adjacent parallel bank...

@johnwehunt4305

8 ай бұрын

Indeed, I purchased 2 48v 16S Paralleling BMS.

These are nice modules for sure! I would buy 4 of them to connect in series for 260V dc and run 240v heating loads like stove, tankless water heater, clothes dryer direct on DC via solid state relays.

@DavidPozEnergy

9 ай бұрын

That would be pretty awesome. If you do that, please send me a link. I'd love to see it.

@clarke6436

9 ай бұрын

Would love to see the wiring diagram for that set and all the parts.

Excellently articulated explantion, a true pleasure to learn from you. Thank you for sharing your talents.

Thank you for doing this! You are a great teacher and i enjoyed the info! That said i now have a great understanding of what’s involved in doing this! I will keep following your site and when i am ready for solar I will find someone as skilled as you to help me install a system like yours! Electricity is deadly and i do know my limitations! Keep up the good work you’re the best!

Love your content David! I didn't see an anti oxidizing compound put on between the copper and aluminum. You will need to take that apart and put some on if you don't want these two dissimilar metals to corrode.

@brainwater

8 ай бұрын

Unless that's nickel plated, not aluminum.

@mlindholm

8 ай бұрын

⁠the terminals on those batteries are aluminum, with aluminum bus bars laser welded to the terminals.

@shodanxx

8 ай бұрын

@@mlindholm Yes, you can see inside the cut that they are not copper at 14:19 i.imgur.com/9NYH3It.jpg Probably not solid nickel either. So, are standard lifepo cells normally using aluminium terminals ?

@janosszabo98

7 ай бұрын

@@brainwater It didn't throw any sparks when he cut it, so it's not steel for sure, and the whole cross section silver colour. Also it bent easily, so aluminium is a pretty safe bet.

"I love doing capacity tests" lol, so many things to like about Dave👍🏾

@DavidPozEnergy

9 ай бұрын

Lol, I get excited over silly things, I guess.

@whereserik

9 ай бұрын

@@DavidPozEnergy nah, Not silly. You love your work, and that's why we value your channel.

AY I JUST BOUGHT ONE OF THESE PALLETS A WHILE AGO. I'm very glad I can see someone else tackle this type of project! Thanks for the video :)

Thanks David. I got wiser about this BMS, Following you from now on. Have a great weekend. 😀

34:00 you can switch the breaker on while the pre-charge resistor is still connected - that's even gentler on the capacitors in the inverter. In fact, in an EV pack, for example, the pre-charge resistor is always present but switched in and out using another switch (aka a relay) while the main contactor (your breaker) is operated..

Would love to separate the 12v (4s) and 48v (16s) sections but leave them secured in place. Can’t help but think the 12v 280AH side would be great for a couple 12v heat mats so the entire thing can be used below freezing! Lots of good uses for this!!

@DavidPozEnergy

9 ай бұрын

For sure, leaving it glued in place e makes a lot of sense.

@kmschwem

7 ай бұрын

If you’re going for 4 shelves you could just run a second set of lugs and make the series connections with cables. Lots less work than cutting them out.

Thank you for your time and effort David.

@DavidPozEnergy

8 ай бұрын

Your welcome. Thanks for watching.

Loved your video, I saved it and I can watch it again and again, thank you for doing that. Awesome for sure.😊

Yes dave lets get into paralleling different capacity lithium batteries in a main system. Alot of people I know are looking to upgrade capacities.

Great video! I bought 8 of the two-for packs of these 280 Ah CATL cells. Way better value than the $130 for each 100Ah I was paying. Glad one of the makers made a video using these cells. Keep up the great work! We're learning a lot from you.

@local378

8 ай бұрын

I saw those how were you planning on connecting them, just drilling and adding a small bus bar?

@martiruda

6 ай бұрын

where from???? I want to import to NZ

I watch it whole, without skipping. Excelent job. I am not educated in electronics and its really hard to me orient in much more simplier things, but this is crystal clear. I dont know how other countries but in our, we are limited to connect anything more then 50kW without license, used to be last year max 10kW.

Great Video David. Informative for a future system and since the discount expired I will be more attentive. Thank you again…

Better choice for banding is Harbor Freight's banding clamp witch is 15 foot in length and would easily fit around the cells. It uses a ratchet to tighten it. It comes with 4 corner pieces to provide protection at the corners. It is $6.99 plus tax and shipping. That's what I used on my lfp prismatic cells. I used two pieces of 2x6 at the ends slightly longer than the cell width. My cells look identical you those you purchase in that pack. EVE and CATL sell the cells individually with M6 threaded studs. for low price. I bought the 230 a/h one's for $100 each including shipping.

@DavidPozEnergy

9 ай бұрын

That's a good idea. Thanks.

@rob2950

8 ай бұрын

Where did you get those cells… sounds like a deal. 😊

@sinamos3945

19 күн бұрын

Where did you buy?

That 16S wiring diagram is a new one to me. That 7 wire tie in at 14+ and two wires to 16+ is unique. They are all different, gotta pay attention for sure

What an awesome rig. Great video man 👍👍

Talk about the coolest DIY project I've seen so far on your Channel

@DavidPozEnergy

9 ай бұрын

Thanks, I appreciate that.

The timing of this video is perfect! I just purchased 50kwh of these for an EV. Thanks David!

@easypowerwall

9 ай бұрын

Have 4x 16S too, works like a charm. Have fun.

@restfulplace3273

9 ай бұрын

Now I’m curious what your ev project is. Please do tell

Here’s a tip for measuring the voltage of the first cell via the BMS JST connector and the pin for the first cell is uncomfortable close to the common/ground pin: Measure the voltage (potential) for a series of cells, ie. 16V from 4 cells when measuring from Pin 1 (Common) to Pin 5 (4th cell) and then subtract from that the voltage (potential) you measure between Pin 2 (2nd cell) to Pin 5 and that will give you the voltage (potential) between Pins 1&2.

Excellent video! Very well documented, great video, audio, and lighting as well as your step by step instructions/explanations. You made a subscriber out of me! :)

Thanks David great job dude, love you and your content.

Wow ! Way totally off the change . 🤗🤙All I can say David . May the solar be with you .😉🔋🔋🔋🔋🔋

@DavidPozEnergy

9 ай бұрын

Thanks.

David, this is another great video. Thanks for putting this out there for all us LifeP04 nuts. Certainly something to consider. I actually have a remote cabin just as talked about with 12v lights and small on demand water pump! Presently only have a small system with 385AH LifeP04 battery I built from raw cells. I do have a Samlex 1500 watt inverter that is only minimally used but if we were to go big and have a larger battery and inverter we would "find" more use for 120v AC. This Solar/LifeP04 stuff is addiction. It just makes one want to build more batteries and put up more panels! Where does it end???! Is there a LifeP04 rehab center in the US yet? Perhaps you and Andy could start one!!

@DavidPozEnergy

9 ай бұрын

That's awesome you have a small cabin with 12V lights. Yes, the addiction is strong.

Very insightful seeing this car battery tear down. Air vents between batteries & ripples in the battery connectors to allow movement

Another great battery setup David

Nice job, very interesting to watch. Love projects like this. Curious to see how you rack and connect the rest of the units. One question what did the original battery assembly weigh before you took it apart?

@DavidPozEnergy

9 ай бұрын

I think the shipping weight was 700 ponds for the pallet, so maybe 330 ponds per module?

Very well done presentation David! It was detailed but not confusingly so. Thank you!

David always does great video's !

Thank's David ! Your vid's always awesome !

@DavidPozEnergy

9 ай бұрын

Thanks for watching.

When you did the precharge, you would have been safer to attach the first clip to the inverter side. As it was you had a floating lead on your table unfused with full voltage/amps for longer than necessary.

@DavidPozEnergy

9 ай бұрын

Good call, thanks.

I've wanted move entirely to solar and battery with propane gen backup but cost has been the barrier. I've also never done anything like this before but I'm pretty good at working through things and think I can do this safely. It's tempting at this price.

This is amazing skill transfer thank you so much for the detailed content

Thanks David. I got a nice discount on the 2 module purchase. Helped to not hurt so much!

Great content, so how would we go about leaving the battery as is ( as much as possible) and using a step down / appropriate bms to handle the voltage up and down….

@peterwest323

9 ай бұрын

Had the same thought. Seems like it would be a lot less work.

Awesome video as usual 👍 You have great patience and clear explanations😇 I've spent the last year buying various cells from different mainly chinese sources. I presently have 120, 200, and 280 x 2 ah packs all in parallel and 2 more in testing. They all work fine. I've tried various BMSs Jk 2amp active balancing is the way to go or JBD with an extra 5a active balancing board added . Definitely not Daly absolutely crap at balancing. Despite spending weeks parallel top balancing; passive balancing is no good with different capacities unless you reduce the maximum charge voltages to suit the weaker cells , which reduces your overall capacity. Its been a vertical learning curve. You seem to have more and cheaper options for solar materials than we do in the UK.

A very clear and informative post. I found your channel by accident and it caught my interest as i DIYed a Caravan and 4WD with Solar (with 12v deep cycle batteries) for our round Australia trip.Subcribed as i want now to do my house..

@DavidPozEnergy

8 ай бұрын

That trips sounds awesome.

Seriously loved this video! enjoied the whole ride!

@DavidPozEnergy

8 ай бұрын

Glad you enjoyed it!

Don't cut that second pack! You should work out a deal with battery hookup to get you 3 more modules so you can wire them as 5 x 48V packs as you describe without more cutting. Then you will have 6 x 48V strings total + extra 12V battery. You could sell your EG4 rack to help pay for that.

@DavidPozEnergy

9 ай бұрын

Good idea. Battery Hookup gave me a discount on these packs already. They are a small company and I don't want to take advantage of them.

I like your video's. Would be very interesting to see how you could parallel batterypacks with same voltage (ofcourse) but different capacities. Especially for people who already have a battery pack, but want to extend it and can't get the same capacity cells anymore.

@DavidPozEnergy

9 ай бұрын

Thanks for expressing interest. It helps me plan future videos.

@ambersmith6517

9 ай бұрын

Yep that would be a good video!

@dancampbell167

9 ай бұрын

I would be interested as well. Makes future planning much easier with the great information David gives.

@chimpo131

9 ай бұрын

@@DavidPozEnergy if only these weren't laser welded together I'd bite. hate the idea of not having easy access to reconfigure them or have the ability of quickly replacing a bad cell.

@Ozzy3333333

9 ай бұрын

@@chimpo131Hmmmm, laser welded? I did not see that in the video, what time?

Where to begin? 1. Super Nerdy yet very engaging. 8.0 2. Production quality is excellent for this type of video. 9.5 3. VERY informative. 10.0 4. Can be used as step-by-step instructions. 10.0 5. Helped me decide to just spend the money and buy a Powerwall from Tesla. (But that's me). You sir have a new sub.

@DavidPozEnergy

8 ай бұрын

Thanks. I'll take that score.

That puddy looks like what we put in between a computer processor and a cooling tower. It helps with heat

Great Inspiration, particularly liked the realization that 4x 20S = 5x 16S hack to standard 48v system. Pre-fab structure is a plus. My only real concern is what happens when a single cell needs replaced. Your experience of disassembly does not seem easy for long term maintenance. Thanks for the effort and sharing.

@onlylettersatozornum

7 ай бұрын

I think that concern is part of the reason for even DIY to start from a very robust product, as David selected here from BatteryHookup, and I think both the original design and David's approach to keep it similar take failure somewhat into account. As long as the failure mode is just more severe degradation than other cells, that single cell worst case would only drop that 16S string voltage to 15/16th, that's still nearly 94% (95% for original design 20S). Even if over 6% capacity loss seems severe, the 5x parallel arrangement brings that down to just 1.25% capacity loss overall, as the other 4 strings would level out power for/into the degraded 5th string. Now if you're concerned with an Open-Circuit cell failure, which I assume would be extremely rare, and if you consider it too difficult to remove/replace a single cell, your repair might consist of disconnecting/bypassing that OC failed cell with the aforementioned same result of nearly 94% capacity still on that string and nearly 99% overall pack capacity. Assuming a static installation for off-grid rather than EV, you could even extend a cell outside the pack, if the original enclosure/geometry didn't leave room for spares.

I didn't see you apply antioxidant paste between your fabricated copper terminal and the original aluminum busbar. This is essential to preventing corrosion and increasing resistance (and fire!) at this critical junction.

@gruetoo1

9 ай бұрын

Conductive paste.

This is a fantastic video dave thank you

Thank you for your description of voltage needs. I wasn't understanding at first why you weren't using them as-is, and adding resistance. Charging voltage is a good reason. I have a lot to learn, and will watch your videos closer. My solar system has micro-inverters, and may require rectifiers, and transformers to work with batteries, but Idaho is trying to change how they charge people with solar to make sure they pay more for grid-tied solutions, so I might have to do something soon. Thanks for teaching a bit. The site for sure doesn't have those batteries anymore.

@DavidPozEnergy

5 ай бұрын

Your welcome. If you want to add battery backup to a micro-inverter system, then you need an inverter with a feature called "grid forming" and "AC Coupling". I'm using a Schneider XW PRO inverter that has this. I have some videos on that inverter.

If you have large cells, one should consider an active balancer. It has made a big difference in my system. Did you ever consider using them as a 60V system? I wonder if the included BMS can be used. There are components that function at that level. I am waiting on a check to buy a pallet of these along with a pallet of panels. I am most likely going to use 2 - 48V units and combine the 8 extra as a 24V system. I am 24V right now and had a LOT of trouble getting 16 working cells for a 48V system. Bad used batteries sold as new grade A are everywhere.

@DavidPozEnergy

9 ай бұрын

There are a lot of sellers on places like Alibaba selling Grade B (or worse) cells and calling them Grade A. I stayed away from it. At least with these cells you know you are getting high quality. There are some 60V systems, but if I was to keep to the original configuration, it would be for 120V systems (two in series). But I'm pretty happy with my current 48V system and don't want to change everything else just for one battery deal.

@ABaumstumpf

9 ай бұрын

@@DavidPozEnergy "There are a lot of sellers on places like Alibaba selling Grade B (or worse) cells and calling them Grade A." and specially amazon nowadays.

I like seeing this option for A quality LiFePO4 cells. Also wonder what specific EV these might fit into (as they seem like they were made for such).

@JasperJanssen

8 ай бұрын

The module doesn’t look EV at all. It looks like stationary units. Possibly the grid scale storage systems. Edit: energy storage systems (grid scale) is indeed one of the things CATL is into.

@michellelester243

8 ай бұрын

Wind farm was my first thought

Very descriptive with your instructions. Your teaching abilities should be exposed to most teachers in High School. I had absolutely no issues following everything you presented. All was coming in clear as pristine glass. Kudos David.

@DavidPozEnergy

7 ай бұрын

Glad it was helpful!

Thank you Dave!

2:57 shows dangerous damage on the edge of the cell with no more wrappping, no protection. And I wondered how that could have happened and if there is even more if you look closely enough. Best cells on the market based on specs, but for sure not the delivery state

@DavidPozEnergy

9 ай бұрын

I just looked at the time stamp and I see what you are talking about. Then, I checked it in real life. It turns out that is some of the thermal paste that oozed out at the factory. I pealed some back and the blue wrap is still fully intact and there are no dents. Thanks for watching.

I'm surprised you didn't try using a paint remover heat gun to heat the base plate and loosen the glue. I suspect it would have worked perfectly. Also another hint. If you're worried about sorting when testing those connectors with tightly spaced wires, use a piece of solid wire that fits in the connector hole and test one pin that way and the negative side go to the side like you did. This way the probes are separated with no chance of a short.

@DavidPozEnergy

9 ай бұрын

I tried a few things, including a heat gun. I edited out my failed attempts to remove the glue. The video was sooooo long! Lol. This is about 1/2 inch thick epoxy.

@billmiller4800

9 ай бұрын

@@DavidPozEnergy Oh WOW that's a lot of glue!! So a blowtorch wasn't a good idea either 😁

@billmiller4800

9 ай бұрын

@@DavidPozEnergy I wonder then if a piece of piano wire might have worked. Still a great video!

@I4got

8 ай бұрын

​@@billmiller4800 We use to take hot fence wire (depending on what length that we needed) and connect each end to battery cables to cut though like butter on plastic, styrofoam, glue, and many other things...

I'd love to have one of these for my skoolie.

I've been waiting for you to do a video on these modules. You were the first person I thought of when I saw these. So tempting to buy 2 modules with how cheap these CATL cells are. I'd like to see someone AC IR test them (and maybe load test a random cell) first

Very interesting that they don't compress the cells much. Apparently the datasheets mention that the cells are guaranteed for a certain cycle life if they're under a certain amount of pressure.

@michaellarosa384

9 ай бұрын

CATL made these they would know proper compression I would think. Everyone else probably does way more than necessary

@chris_mk5supra

9 ай бұрын

you don't really need to compress them for solar energy storage, you don't push them hard at all, at least if your systeme is correctly sized, i NEVER compress my battery for solar storage, no probleme

The thermal putty looks like the same thing they use for CPU's in PC's. In case you didn't know, the overkill solar app works with JBD BMS's as well. I prefer it over the regular one. Great video as usual!

@billyboy969

5 ай бұрын

That's what I thought too. In computer class they teach to not forget the dope (paste)

Thanks David, very informative!

thank you for this very clear and details desciption great video

Awesome video man, appreciate the share! I have used SLAs for a very long time. I have worked with Li-Ion, but only for small projects. Was absolutely not a fan of such a potential hazard (in the case of unexpecteds). The ideal of a 1000+ Li-Ion cell fire, no thanks! I've been looking to go Lifepo4, and came across these modules a couple weeks ago. Already an amazing deal, but your discount code set me going haha! Not to mention it was awesome seeing the teardown and what to expect inside. Unfortunately as much as I'd love to have the module in its entirety, LTL is expensive and they cannot even come to my location. Postage was less then half by just sticking to the removed cells. Budget ofc also always sticks it's finger at me, so for now I just ordered enough for a 16s build. Unsure on BMS, the 300A was out of stock. Went with 100A smart + the 500A relay for now. Unsettled, on the fence about an REC BMS, depends on how the 100A turns out. Same with balancing. I may also look into designing a custom BMS from scratch, maybe controlled by a Raspberry Pi. The concepts seem straight forward for how the cells are to be managed. I sent an email to see what they do with the module parts once they strip the cells out... I too really like that orange safety disconnect, and the overall build quality of those modules (wire tracks, fan cooling, etc). Would love to at least get the front panel, wire tracks, and aluminium plates between the cells. I still will have to think on how I will connect the cells and deal with busbars. Nickle plated copper is my first thought. Granted, it would be much less work just having the whole module and leaving as much in its original condition as you did. Thanks again for sharing!

This seems like a lot of effort. You mentioned some equipment that would work with the native voltage? What were you referring to if you don't mind?

Very excellent video and explanation of what is to be done and what your plan.

Just building the same using scrapped BMW I3 packs. Pre-charge is to protect the contactors from welding not the capacitors. I really admire the detail and time you have spent making this video, well done.

The thermal pads between the batteries and also the ends is actually easy to acquire. They use pads 'thermal pads' on PC components, it's quite inexpensive, you can get sheets of it for not much money and it dissipates heat REALLY well. Might be worth looking into getting a bunch of it for the ends and between any battery packs you end up creating. It's good stuff. edit: I made this comment before you continued to find some and use it. Honestly it's just electronic thermal pads, they use it in GPU (graphics processor units) between the heat sink and the memory chips, well really under any heat sink that's not a CPU (we use liquid thermal paste for that) but yeah those pads are super easy to find you really just need to know the density and the depth of the pad, you can get it in rolls or as pre-cut pads or just big pieces. You probably already know this, this is a 10 day old video, but I don't really read comments and figured my 2c is just as well as the next guy's. Nice work here, I'm going to subscribe to you, I am super interested in learning all there is to know about renewable energy and getting away from buying government power. Thank you.

Always love your videos.

Thanks David.. U truly inspired me with this video.. I hope to build like you considering that i hope to go into battery building as a business

Excellent demonstration!

i was just considering doing this. thanks.

I love this channel so informative

@DavidPozEnergy

9 ай бұрын

Thanks, glad you like it.

Magnifique boulot ! merci de toujours partager tes superbes idées et initiatives David. 💫👍💯

I think this is aa very well-done video. I really enjoyed watching it and look forward to more. You're giving me ideas. :) Thank you.

Thx!! Now I have some good ideas!

I bought one JBD contactor based BMS. I ran into the same glitch as you ran into and more. All JK BMS’s from 18650 now. Finally no more Aliblabla to buy cells and BMS’s.

Using a bmw i3 battery ( from bmw cold storage) I went 14kwh ( usable) with my second battery at 4.1v nominal on a 64 volt system I run the victron and bms on 60.2 volts for solar, and the generator runs to 58.6 on backup. Year 3 now on a sungold 18kw inverter switched to a 12kw inverter. Total cost of the bmw battery was 2800 with 00 wire for all the leads. Love it saving for 2 more. Battery never heats up because of the monster heat sinks built in. Tyty David for setting me off on my adventure. You Chevy volt battery inspired me!

Great video David. They would work great as is with my Sun 1000 grid tied inverters as they have a large voltage range then Just AC coupled to the main inverter, just need to bms and adjust the charge controller.