Build your own solar battery, fast and cheap!

This was the fastest, and least expensive, DIY battery I've built. The modules have a thick aluminum case, housing 280Ah LiFePO4 cells. These might be the best option for building out your own solar battery bank. I'm re-using an old server rack, in a server cabinet, to house my batteries.
Intro: 00:00
Wiring Harness: 01:57
BMS Installation: 04:54
Capacity Test: 06:53
Cost Breakdown: 13:55
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Battery Hookup Links:
Note, the links are not affiliate links. The affiliate program is through the discount code. Please use code DAVIDPOZ at checkout. batteryhookup.com/products/ne...
Battery:
batteryhookup.com/products/25...
Battery Hookup Home Page: batteryhookup.com/
BMS, 300A Contactor-based: batteryhookup.com/products/7s...
BMS, 100A, inexpensive option: batteryhookup.com/products/12...
Coupon code: DAVIDPOZ
--------------------------------------------------------------------------------------
Orient Power Affiliate Links:
DIY BMS: www.opsolarbattery.com/produc...
Limited Time Coupon Code for 8% off: DAVIDPOZ8
Standard Coupon Code for 5% off: DAVIDPOZ
--------------------------------------------------------------------------------------
Amazon Affiliate Links:
Washers, Fender, stainless steel, #:10x3/4": amzn.to/3riRGSQ
ICharger X8, speeds up the balancing of cells: amzn.to/3PCilTP
“As an Amazon Associate I earn from qualifying purchases.”
Server Rack batteries are a great choice if you don't want to DIY your own battery. I recommend the EG4 batteries from Signature Solar. Here is an affiliate link to the rack of batteries I use every day: signaturesolar.com/eg4-lifepo...
Schneider Inverter: The Schneider XW PRO inverter has been powering my home this year without any problems. I can recommend it. signaturesolar.com/schneider-...
Disclaimer: Some items may have been provided at a discount for the purpose of a review. However, the thoughts and opinions expressed in this video are those of David Poz, LLC. only.
Disclaimer:
My videos are in no way intended to be instructional "how-to" lessons. I am simply documenting my project for informational purposes. Property damage, personal injury, or death may result, even when following manufacturer's instructions. I cannot be held liable for such damage or injury. It is YOUR OBLIGATION to ensure that you are complying with any local and federal laws as well as code and permit requirements.
David Poz, LLC

[@vandela177]

Fantastic!!

[@thefirstmissinglink]

Bed frames seem to turn up in my life regularly. Chop saw and a cheap welder builds me all kinds of racks and mainframes.

[@DavidPozEnergy]

I've used bedframes on some projects. I remember once not being able to drill through it. Have you ran into that?

[@thefirstmissinglink]

@@DavidPozEnergy yeah it is hardened. An option is the carbide bits for concrete will work.

[@jws3925]

@@DavidPozEnergy I used to pickup bed frames from along side the road and thought I'd use it for non critical projects in place of expensive angle. Well, I found out the same as you. You can't hardly drill thru them and try driving a self tapping screw into them. Not happening. I quit picking them up and rarely use the for anything now. I wonder what they did in the process of making them that made them so hard?

[@vernt4583]

@@jws3925 high grade steel and properly annealed- heat treatment

[@jerbear7952]

I end up with bedframes too. And aluminum ladders. Its a universal constant for me.

[@SVThailand]

This is the ONLY channel that TEACHES me stuff! I sell solar(used to install) and I didnt realize how much i didnt know!

[@urbanbeeman5402]

Sweet good vid David

[@offgridwanabe]

Nice looking DIY

[@stevedutcher3875]

David, I purchased 4 of these modules, I only did a capacity test on one battery only and got 294 Ah. These are a incredible buy, I am using a smart Daly 16S 150 amp hour BMS’s on each two modules! All batteries were top balanced individually to 3.45 volt down to 2 amps with my Ztech 40 amp chargers. Yes, I did use your discount code, thanks!!

[@DavidPozEnergy]

Wow! You got great results from your test.

[@twigandroot]

awesome work David! this set up is so impressive

[@thespencerowen]

Wow what a great system. This is the cheapest system that I feel confident won't blow up my house. Thanks for sharing.

[@powerwall]

This is a much better option for DIY 18650

[@antronx7]

Nice. Proper capacity test makes me hit the like button.

[@powerwall]

like it

[@loucinci3922]

Very good capacity for used cells. Nice build

[@powerwall]

Agree

[@Ken-wu2bf]

Thanks for the great videos David! I picked one of these up a couple of weeks ago

[@powerwall]

great, share us the experience once installation finished.

[@newagetemplar6100]

Nice wiring on the cells , what a nice setup .🇬🇧👍

[@chasmarischen4459]

Good video!

[@northidahodreaming5657]

well done! thanks for sharing this

[@yachtsteve]

I think that's a pretty good price, plus I like the fact that the batteries have fairly robust protection

[@AveRage_Joe]

Not bad of a price for 14kWh!! I like the way that plastic tray holds the wires nice and neat!👍

[@DavidPozEnergy]

Yeah, that was a nice little bonus.

[@terrya6486]

Clean simple and at a reasonable price 👌

[@powerwall]

Looks like the setup is pretty easy.

[@007slyman]

Hi David from Australia, we enjoy you sharing your knowledge and equipment. Bummer we cant get this in Aust. I'd purchase straight away. Thx anyway will continue watching you vids

[@Roll2Videos]

Wow! That is amazing, Thanks Dave 👍

[@powerwall]

Great video

[@StratRider]

excellent video - building my own with components suits my style

[@powerwall]

DIY

[@coryr6359]

really great, informative content. thank you.

[@jaspermachnik]

Thanks man, 514!!

[@riftvalley1765]

Thank you for another nice video brother

[@chuckb9867]

Thank you for your video I look forward to these you're so knowledgeable

[@powerwall]

very impressive

[@dr.projectx5142]

Nice that's great to know. Love the video ls keep it up.

[@GiC7]

Thanks

[@korishan]

I just ordered some of the SPIM08HP cells and hardware for making a battery for my UPS (not quite set up for house inverter yet) that runs my server rack and livingroom. I used your promo code, of course 😉 So now just waiting for them to pull the order and ship so I can get that online soon

[@DavidPozEnergy]

Sounds good. Thanks for using the code.

[@brianimpellizzeri325]

I would buy a 24v diy BMS if they had it available. I bought three modules thanks for the info.

[@seanathanq]

love the videos, i wanted to get one of those packs just cant justify the shipping for only one battery, and cant afford more than one hahah, but i can live vicariously through you

[@DavidPozEnergy]

Individual cells can be shipped in smaller boxes, saving money on shipping. That would probably be a better choice if you are making a single 24V battery.

[@craighansen7594]

I am trying to catch up on how to utilize the lithium batteries. I am still assembling some solar panels from individual cells I purchased year ago. They are intended to go with a small camper trailer. The way I'm approaching the shipping cost problem is getting friends interested in doing this as a joint venture.

[@EndlessBatterySolutions]

excelent.

[@clarencewiles963]

I’ve been passing to everyone. With the weight of batteries 🔋 and wall mounted hardware. Getting a engine lift to help pickup and install to he wall will save your back. The Engine Lifts are mounted on wheels and has good reach with weight abilities. And you do some heavy lifting. Thanks again for your posts.

[@rebelyell1580]

You can get a 1 ton chain hoist for less than $40 - works like a charm.

[@serverrackbatteryusa]

good suggestion

[@TheGuruStud]

step one: don't be weak LOL

[@Lana_Warwick]

Guess it makes sense to rack panel makers to place the display, switch, etc, inline with where cables, solid busbar runs. Perhaps that would be a good suggestion to them. Now to check out cost to Au.

[@majidjan3990]

Wo great battery

[@jimthvac100]

You inspired me to purchase two of Battery Hook up's Gotion 16s 51.2v 240ah 12.3kWh Lifepo4 Battery's. comes out to about 130 a kw hour when you factor in purchase of the BMS, tax, and shipping. (not counting a breaker or a disconnect.) Still waiting on them to arrive.

[@fredflintstone1428]

Brilliant video. What a shame there isn't something comparable in the UK.

[@powerwall]

Orient Power Powerwall battery is available in stock in UK.

[@robjohnston8632]

These modules look amazing and the only negative I can see is we didn’t get to see you build “stuff”, they were almost plug and play. No welding, cutting, soldering or measuring - just adding 6” of wire. That’s what I love about your channel - David Poz builds “$hit”!!! Thanks for showing these cells and I may expand my off grid system.

[@powerwall]

very easy right?

[@e6ensperception]

For the price whats better on the market?

[@mattgirgenti3595]

very nice!! and thank you for doing cost #2 'or 'full rack'. My first question while watching was "how many units can ship on a pallet?", which you answered. The 7 unit build is bigger than I need, but cheaper than my original plan. Very intriguing and seems more than worth it. I just need to decide on BMS size/type. Very helpful - thank you!!

[@DavidPozEnergy]

Your welcome. Good luck with your build.

[@Sustainavore]

Subbed. Love your approachable builds and looking forward to building one when we have our own place. Question: do you think something like this would be doable in a van? 14kwh would be plenty!

[@DavidPozEnergy]

Sure, this is something that can be built into a Van. I would spend a lot more time bolting things together and securing them into the frame.

[@cxsey8587]

Could you look into assembling a sodium ion bank? I’ve seen some of the cells out on the market

[@igorkvachun3572]

Yes video.👍⚡🔋💡

[@KevinGebo]

Nice work David! Good idea to ask Orient Power to sell the "DIY BMS"!

[@AGhostInTheMachine]

yeah, that is pretty cool

[@powerwall]

It is our pleasure to bring new products as per market & clients requirement.

[@powerwall]

@@AGhostInTheMachine thanks

[@jamesstoffel6835]

Thank you for posting these info / how-to's! I learn alot (and still learning). I have a wood shop that I would love to make 'off grid' that could take advantage of the sun and wind in my location. Out of curiosity, have you written a 'how to' in building, installing an 'off grid' system that incorporates solar panels and battery systems? Or is there a book you'd recommend, if not a series of books?

[@DavidPozEnergy]

I have not written a book. I've read dozens of books on the subject, but I don't recommend any of them. My favorite series to recommend is a 6-part video series from Alt-E: www.altestore.com/diy-solar-resources/off-grid-solar-system-design-video-series/

[@ToddDesiato]

The problem is that the NEC 2020 and beyond are requiring that ESS be "Listed" or field inspected for compliance to UL standards. That is expensive, so there is no savings in building a DIY battery if you're required to comply with code.

[@unionse7en]

yep, you'd have to get inspected with a minimal UL listed system then add or replace with DIY

[@JeremySpidle]

No one DIY building batteries is doing so commercially, so pretty sure that Code compliance won't become a significant issue.

[@jstaffordii]

Only matters if you're installing in your house/living space. Most building DIY large ESS do so in a separate battery shed which negates the code compliance issue. Or they are off grid and not worried about inspection. My electrical inspector only cared about the AC side of the system. Didn't even look at the DC side even when asked if he needed to see anything.

[@sspyder181]

I just purchased 8 of these modules and 4 jbd 300amp smart bms from them and since im 30 min outside philly I drove my 3500 and just picked them up. Amazing savings for 1120ah 😮

[@DavidPozEnergy]

Good deal. An hour trip is worth the savings in shipping for sure.

[@Scat.original]

I have emailed them about that BMS to see what Inverters it support but didn't get a reply. What inverter are you goint to use with that bms? Thanks

[@mistercohaagen]

I always wanted to see what the mounting hardware looked like to put these types of cells in a car.

[@APatchworkCanvas]

I’m in PA.. wonder if I could pick these up at the warehouse!

[@MRRadio-un7xn]

Hi. Thanks for your service and all information sharing with us. This BMS can configure in close loop with Schnaider? Thanks

[@DavidPozEnergy]

I think so, but I haven't tested it. I have a video setting up closed loop with a similar BMS to the Schneider Insight home. The process might be the same, but you would have to confirm with Orient Power. Like I said, I haven't tested this "DIY BMS" with Schneider. kzbin.info/www/bejne/p6SVmHhorLdmkKMsi=9TyCDVHETOtc_8Ac

[@calcook7057]

Thanks for the test and giving me more options for DIY builds! My motorhome is already set up as 24vdc with two 3kw Growatts. Could I use the Jakiper bms and just change its parameters to 24vdv pack settings?

[@DavidPozEnergy]

No. The BMS is 48V only. Battery Hookup sells 24V BMSs. Select "8s LiFePO4" from the dropdown list: batteryhookup.com/products/12v-lifepo4-smart-bms-w-low-temp-cutoff?_pos=6&_sid=be404606b&_ss=r&variant=37389087506594 Although, just now when I snagged the URL for you I see they are sold out. They usually restock quickly, but you could call and ask when they might have more.

[@purelyinvinciblellc]

First off, you are strong as can an ox! I thought I was going to just pick these batteries up like you were holding it at the beginning of the video.... My back is very upset right now lol. They didn't have any of these packs as you bought them, the only option was the auction pallets. I bought some and one module had a bad cell. I figured it was no big deal, I'll find a way to take off the welded terminal and put a new one in. That was short-lived. I was able to cut and pop off the terminal so I started to unscrew the bolts but found there were rivets on the bottom so I drilled them out. I then found that the top and bottoms are also welded. It's impossible to get these out lol. I am thinking of just setting a cell on the side and connecting it 😂 I have 8 of these modules so I have some work to do! Some of them just have the welded terminals broken so I will have to drill in the cell and put a helicoil but we will see how that goes.

[@DavidPozEnergy]

If these are going in a stationary application (like I'm using), then I suspect one cell on the side isn't going to make or break your build. Keep to what's easy for you. Thanks for sharing your experience.

[@purelyinvinciblellc]

Here’s an update. I opened the module finally and I went to helicoil one of the cells. I researched that they are 6-7mm depth. I went to 5mm and went thru. I went to do another and couldn’t get enough threads even after cutting off the taper. Tried another one a little deeper and went through. I think I’m just going to replace with studded cells.

[@purelyinvinciblellc]

is there any harm in using existing balance wires and tying them to the BMS harness? I ended up drilling through 3 cells and stripped 2 because it was too shallow to grab. I accidently popped 2 welded terminals off while trying to open the case so I will have to replace those too. @@DavidPozEnergy

[@DavidPozEnergy]

I re-use existing BMS wires all the time for my new BMS. I'll point out something that is probably obvious, but here goes: BMS wires are thin, and can't carry the full current of the cell. Don't try to use the BMS wires as power wires.

[@purelyinvinciblellc]

@@DavidPozEnergy Ive got them wired up to a sweet busbar. Last question (i think) is there any way to reweld broken welds or any links you know of to do this? Trying to drill the holes has not worked and ive tko'd a few I believe that welded cells have a shallow avalible depth compared to naturally studded cells.

[@juanmacias5922]

Dang, wish I had the dough to make my own battery!

[@edseldumanig1358]

David, what's the size of the bolts in positive and negative ends? I do have these but there's no bolts included and one positive bus bar end been cut.

[@GobelPowerBattery]

If the battery cell capacity is around 280AH, it means it can provide higher current output capacity. Using a 100A BMS may result in a lower current, 200A BMS would be faster.

[@shawnd567]

Thats a really good price from battery hookup but i simply dont need that much capacity. Great video though

[@quartamile]

Thank you! Great video! What's the range of age of the batteries?

[@powerwall]

Good questions

[@jl9678]

After your last battery video, battery hookup ran out of stock on the 20s packs quick! And I missed out. The success of that video hurt me lol so I better jump on this deal stat!

[@DavidPozEnergy]

Only jump on the deal, if this battery will work for your needs.

[@jl9678]

@@DavidPozEnergy it pretty much seems perfect for my build so I ordered 6. I used your discount- thanks edit: boy am I glad I acted quickly: showing sold out on the website already.

[@alexc9388]

Than you David. Good video. Question: Does the Jakiper BMS setup work with Schneider xw pro. Is SoC available? Also, what base are you using to place the batteries?

[@powerwall]

good question, david has schneider XW PRO

[@WiSeNhEiMeR-1369]

HOWdy D-P, ... Thanks = neat DIY-BMS ! ... COOP ... the WiSeNhEiMeR from Richmond, INDIANA ...

[@reelrebellion7486]

I may have missed this in your previous videos, but have you done an estimate on how much battery you need to be totally off grid? I realize there are many ways to skin that cat, how much power you generate in winter, etc, but a case study does wonders for understanding.

[@DavidPozEnergy]

Thanks for the video idea. I'll add it to my list of future videos.

[@majid_us]

Hello, Do you have a video on top balancing procedure (or can you recommend a video)? I am trying to learn about top balancing. Did you have to take the 8S and re-wire them in 8P in order to top balance them? I have an EG4 battery (48V, 16S) with some of the individual cells not behaving and over charging when getting close to 100% SOC. I am trying to figure out if I need to re-wire them in 16P in order to top balance them. Thanks in advance for any reply...

[@DavidPozEnergy]

I don't have a dedicated video on top balancing. In this case, the cells are welded together, so I'm not re-arranging them to be parallel. Instead, I used a combination of a hobby charger (I-charger X8) and the BMS, to balance the cells. At one point, I made a video on Jakiper battery rack. It had 4 batteries. One was not performing as well, and found one cell was hitting high Voltage before the rest. I used a water heating element (big resistor) to discharge some energy from that one cell. Basically I was manually top-balancing. You could try the same thing.

[@niffrig]

Maybe use a NEEY active balancer

[@valentinguillemot]

Thanks for the video ! Do you know if we can you put multiple DIY BMS modules (16S) in serie (for a 600V inverter) ?

[@DavidPozEnergy]

No, these BMSs are not rated for series connections.

[@valentinguillemot]

Ok thank you !@@DavidPozEnergy

[@johnathon007]

Is there anything like Battery Hookup on the west coast? The freight from PA is insane to out here in Oregon.

[@powerwall]

how many kwh you need?

[@aaronhope8366]

Now I'm looking at getting a small size rolling server rack for power just for radios along with a single layer (two modules) of power. Is there a way to hook this up for 12v?

[@DavidPozEnergy]

If you want to build a 12V battery, then I'd check out some other options from Battery Hookup. Here is an option with these large cells: batteryhookup.com/products/4-new-eve-3-2v-280ah-lk280k-lifepo4-prismatic Please use discount code DAVIDPOZ it helps you with a discount, and helps out the channel by tracking the affiliate.

[@outroot]

What server rack is this? What's the depth? I have those CATL modules too and I like that they fit in there!

[@DavidPozEnergy]

It says "APC Infrastruxure" on it. I'm not a computer guy, so I really don't know how to tell one thing or another. I bought it from my local recycling center for $75. The outside dimensions are 23W, 42D, 82H

[@Shadow0fd3ath24]

Signature Solar is selling EG4 server batteries brand new for $195 per KWh currently with no DIY/wiring/BMS currently. I want to go that way but the diy is so attractive tbh, think i may go this way instead

[@DavidPozEnergy]

There are pros and cons to both ways. I bought a rack of EG4 batteries about 2 years ago and it's still working well. Here is my affiliate link to Signature Solar if you decide to go that way, you would be helping the channel: signaturesolar.com/?ref=4_rHcgZ9x-TiF-

[@trickyynicky]

Link to batteries is broken

[@TheAADuke187]

Where did you get the server rack to fit the CATL packs? I got 12 of these and need to find a sturdy rack.

[@DavidPozEnergy]

My local recycling center. I bought it for $75. You can also search on craigslist and Facebook Marketplace. Use search "Server Rack" and "server cabinet". The CATL module was about 1/8" too wide, so I notched the back rail to slide it in.

[@jl9678]

Hi David. Do you have a link for that orange flexible busbar you used for connecting between the two 8s packs? Thanks!

[@DavidPozEnergy]

No, sorry. It was something I had from another battery I took apart. If I didn't have that I'd probably use a 1/0 wire with a ring terminal crimped on both ends.

[@jl9678]

Many thanks!

[@zincfive]

It seems that Battery Hook up doesn't have these packs in stock...

[@chuck4fun]

👍

[@wim0104]

if the storage capacity of these batteries is worn down to 90%, roughly how many cycles are left; 50% ?

[@jimmy4518]

behind you under the computer is a battery, the cells are separated by spacers with ventilation area. what are those and how do i find them?

[@DavidPozEnergy]

They came with the battery I bought at Battery Hookup.

[@mark33545]

Holy shit havent been on your channel in a couple years, i had to click on the thumb nail because it looked nothing like you lol

[@fredlo6935]

Hello Dave, Have you gotten your hands on the Battery hook up 51.8v 252ah 13.05kWh 14s ESS Battery Module with BMS battery for sale. Looks tempting, would love to know if we can actually use the bms and RS485, Can, and RS232 it comes with our inverters. Maybe this can be your next video. If anyone can figure it out it would be you.😂

[@DavidPozEnergy]

Hi fredlo6935, I have not tested that battery. Looks very nice.

[@davidabineri908]

how do you top balance with cells in parallel when they seem to be fixed in series?

[@DavidPozEnergy]

I left them in series. At first, I used my I-charger to do the bulk of the balancing. I hook leads from each cell to the i-charger and let it balance the cells. But, then for more fine-tuning, I do some cycles and let the BMS finish balancing them.

[@RichardLeslieWhereat]

What would we need if we live in a country with 240v?

[@MakeItAdmirable]

Is there a way to do top balancing and capacity test if I don't have all those tools?

[@DavidPozEnergy]

The BMS will eventually top-balance the cells on it's own. I used the I-charger to speed up the process. Another alternative I've done sometimes. Get a water heating element, connect two wires, and drop it in a bucket of water. When you are charging the whole battery, and notice one cell is higher than the rest, put the two leads on just that cell and it will burn off some of the power. Another alternative is to get a cheap hobby charger, like this $40 option: amzn.to/3Zhlbkx which comes with a accessories. Charge each cell one at a time up to 3.65V.

[@GobelPowerBattery]

Would you like to do a capacity testing on our brand new HSEV EVE 280K cells? We have tested most of them are over 300ah! We hope you can do a test for them too…

[@jbuszkie]

@GobelPowerBattery, Send them to me! I'll test 16 or 32 of them! lol

[@user-un1om9nb1s]

David, I purchased 2 DIY BMS from Orient Power. Can you give me Software and Computer hook up direction to change 100 AH to 280 AH. Like you, I'm nervus on computer to BMS functions. Many Thanks! Really appreciate your Videos! Jay

[@chuxxsss]

Morning David, Nice day here 27 degree here in Southern Australia. I did look at the front panels. Where is your door on your server rack. lol. I got secondhand aluminium plate from a crap yard. 30 dollars au that way.

[@DavidPozEnergy]

Hi. I have a door for the server cabinet. Once I finish wiring the batteries together I'll put it on. I bought the server cabinet at my local recycling center for $75.

[@chuxxsss]

@DavidPozEnergy They have got up since I got mine at 30 dollars au, David. lol, but they are very handy.

[@hobbyguy79]

Maybe for that BMS they could use proper sized cables instead of doubling up smaller guage cables!

[@williaml2345]

I see jakiper also sells a 230 ah server rack battery. Have u asked if they will sell the front panel of that model? Better breaker and I like the terminal set-up a lot more. For safety I assume u will parallel these once hooked up to your system. Whats the Max wire lug u can get on terminals?

[@DavidPozEnergy]

I don't know if they plan to bring more BMS options to the market. I was able to fit a 1/0 ring terminal, but it was very snug.

[@powerwall]

Hi William, you can also choose to purchase our 230Ah battery directly.

[@bowbilly9080]

What size battery cable can you connect to the Jakiper BMS? Looked on the web site link but don't see it mentioned.

[@DavidPozEnergy]

I was able to squeeze a 1/0 ring terminal in there, but just barely.

[@powerwall]

@@DavidPozEnergy Thanks

[@apathy772]

But, How many years will they last. My electric bill is around 300/month x 12 thats 3600 a yearish its less in the Winter because I live in FL. spending 12k plus idk how much in panels to charge these guys, everything would have to last 5-7 years just to recoup my costs. Do you think these batteries being used daily to power a home could or would last that long?

[@michaelsilberstein]

Geat video. What charge inverter would you put on these to power whole house with the 100kw?

[@DavidPozEnergy]

I'm currently using a Schneider XW PRO 6848 inverter. And, I bought a second one to parallel for even more power. I have videos on the inverter. My favorite video is testing the overloading capacity, because It's the best I've ever tested: kzbin.info/www/bejne/pHS5YoKLp8h0l9ksi=rsaoG1UQ0sYt0pA0

[@michaelsilberstein]

@DavidPozEnergy I have an existing 14.5kw micro inverter PV system and trying to add whole house backup/off-grid battery system. I need 70-75 kw batteries to do this for the worst case days

[@DavidPozEnergy]

You may want to research a term called "AC coupling". Some inverters will allow AC coupling, and some don't. If you have this feature, then you can still use your existing solar system (with micro inverters) while the grid is down. I've tested the AC coupling feature on my Schneider and it works well. If you don't want to go Schneider, look at SMA Sunny Islands, they also do it.

[@michaelsilberstein]

@DavidPozEnergy Sol-Ark 15kW All-In-One Hybrid Inverter, can it just $7k. And well it is a lot to spend on just the inverter with no one I trust is speaking about it.

[@DavidPozEnergy]

Personally, I'm not a fan of the Sol-Ark line of inverters. If you want those types of features, then check out this one: signaturesolar.com/eg4-18kpv-hybrid-inverter-all-in-one-solar-inverter-eg4-18kpv-12lv/?ref=4_rHcgZ9x-TiF- note, this is an affiliate link.

[@realeyesrealizereallies6828]

You need to put a good active balancer on those packs, (NEEY) especially with the studs on those cells, it would be simple to install, or the JK BMS with 2 amp active balancer..A passive balancer will never get those under control in the long run..Communication really isn't important, a smart shunt and the bluetooth app with the JK BMS is really more than enough..I don't even have a shunt for my different two 16s 48 volt packs..It's fine...I'm still building CATL packs I got from Battery Hookup, and I have 16 280 Ah Eve cells, but I'm getting there..Everyday somethings showing up, only need a few more pieces of the puzzle..

[@DavidPozEnergy]

I tested an active balancer a few years back and it made my pack worse. I removed it. There are more than one way to build a battery pack.

[@realeyesrealizereallies6828]

@@DavidPozEnergy Ya, you can't leave them on all the time..Only when the pack finishes charging and is settling into it's regular resting voltage..And then they work like a charm...I charge to 3.45 a cell which is 55.2 volts, and that is when the balancer kicks in, it stays on for an hour until the voltage is resting at 3.35 a cell or 53.6 and the difference between the cells is 3 to 5 millivolts...My buddy hooked me up with that system, and he said he learned it from someone who tests packs on the internet..Works very good..Even on used cells..But, if you leave the balancer on all the time, it makes the situation worse, and I can confirm that, because I tried it on two different packs..

[@FirstnameLastName-sx8ls]

This is all very intriguing, however where do you start if you don't have an electrical engineering degree? I love the DIY aspect, but it feels like this is over my head.

[@DavidPozEnergy]

Begin with what your goal is. My goal is to power my house and garage, year-round, off grid. However, you might have a smaller goal in mind. My very first solar project was to have one LED light bulb on, and charge my cell phone. There is a great video series that I recommend. It's 6 parts and worth the time to go through them all: www.altestore.com/diy-solar-resources/off-grid-solar-system-design-video-series/

[@ahaveland]

I'd get a couple of these if they were available in Europe. Also, with a bit of creativity, could parallel up the batteries and cells and use 1 BMS for 2 or more sets, but balancing current would proportionately decrease per cell.

[@FRESNEL_COOKING_SOLAR_OVENS24]

Sure you can! You can parallel each identical battery with the same age and capacity. If you are looking for best price in Europe, use grade A Fogstar from UK or choose German cells. Another good company with good price in UK, is Roamer. You can get 48v 5.4kwh battery for 1.8k with incredible good warranty 10 years which is not easy to find anywhere.

[@powerwall]

Orient Power have battery in Germany, Romania, Netherlands.

[@glossyfpv1155]

We can't even get them here in America so don't even worry about it 😂😂

[@rustusandroid]

How did you wire the batteries up for 48v? I don't see anything attaching the two batteries together.

[@DavidPozEnergy]

I used an orange copper busbar. It's semi-flexible and left over from a battery I took apart previously. I save spare parts for this reason. I show it in the chapter installing the BMS.

[@rustusandroid]

@@DavidPozEnergy Oh, I see it now. Somehow I missed it :)

[@HandfulOfTranquility]

Your discount codes aren't working for Orient Power. The 8% isn't too surprising since it was limited time, but the 5% isn't working either So glad I found this video, I had no idea this diy bms was available. That will actually let me make a professional looking battery that is nicely enclosed

[@DavidPozEnergy]

I asked them about it. If an item is already on sale (example: early black Friday) then you can't double up the discount. Sorry about that. Please still use the affiliate link, as it's how I can continue to make these videos.

[@ShuhDonk]

I am doing a diy setup, my first time doing solar. I plan to go off grid and looking for a lot of battery storage. I will be running my home and pole barn/shop off the solar/battery. If I were to purchase 4-6 (8-12 packs) of these batteries will the 100 ah bms be sufficient to run everything, air conditioners, 220v shop tools etc? Or do I need the 280ah bms you were referring too? I plan to use a eg4 18k inverter/charger.

[@DavidPozEnergy]

To answer that question, we need to look at your total loads. If you plan to purchase one EG4 18KPV inverter, it can output 12kW cont. while off grid. That could be up to 275A from the battery bank. If you plan to have 4 batteries in parallel, that's 69 Amps per battery. That's fine, no problem. However, I'd be concerned if one inverter would be enough. Reading your question, and seeing two buildings, one being a shop, there is a lot of potential. I suggest making yourself a loads list. Write down a realistic worst-case situation. For example, a table saw with dust extractor, lights, air filter, air conditioner etc. all on at the same time. If you do that for both house and shop you might find that 12kW isn't enough. If you decided you wanted 2 inverters (or at least the potential) then you are talking 550A from the battery bank. At that point you would need 6 batteries with 100A BMSs on each to make it, and it would be cutting it close. Or go with some larger Amp BMS's. The answer always comes back to your loads. BTW, if you would like to help out this channel, please consider making your Signature Solar Purchases through my affiliate link: signaturesolar.com/?ref=4_rHcgZ9x-TiF- Thank you.

[@ShuhDonk]

@@DavidPozEnergyThanks for the reply, I appreciate it. My worse case total load would be 10-12k watts and I think that would be super rare between the house and pole barn, that is with all 4 1 ton mini splits running (~700 watts each maybe?), 220v table saw, 220v dust collection and several thousand additional watts for misc., I think the typical usage would be 4-6k watt load. I am open to suggestions for other inverters I just wanted something somewhat simple that can connect to solar panels, batteries, grid power and backup generator and switch between them automatically. If need be I can always add another inverter for the barn too of course down the road. I used your discount code for the 4 modules, I am pretty sure I used the link from your video too, you able to see if you got credit, I just purchased the batteries a few hours ago., Thank again!

[@Dw-ux1ez]

Hi David. Just got both of my battery modules yesterday. Noticed 3 of 4 main battery posts cut off. Any idea why they’re missing? Or next best lug attachments? Thanks

[@DavidPozEnergy]

What!? That's crazy. I don't know why they would be cut off. I'm guessing it wasn't Battery hookup, probably the company that removed them from their previous application. You can reach out to Battery Hookup and see if they will do anything. As for your question. Sometimes, I've had cut tabs on batteries. I bend the tab up (even if It's just 3/4") then I drill a hole in it. Using a nut and bolt to attach the ring terminal of my wire.

[@Dw-ux1ez]

Thanks for your answer. I reached out to them and they said they’ve separated those modules out now. I thought of trying the prying up method but don’t want to break the busbar completely. They offered a return and I’m going to try to take them up on it.

[@DavidPozEnergy]

I'm glad to hear they are taking care of you.

[@gg-gn3re]

Would the BMS eventually balance all of them, that's it's just right? Is the method you used just to speed it up or something (you mention small cycling of them)? Do you have a video on the methods and differences of it? I always thought it just balances them behind the scenes but they are quite off balance still for days in your video. My only experience is 18650 DIY and they take a few minutes at most to balance.

[@DavidPozEnergy]

The BMS will eventually balance the cells, but the cells have to be above a certain Voltage (I think 3.4V). When the cells are resting they will drop below 3.4V, so the BMS won't balance if they are just sitting there. I don't have a dedicated video on balancing cells, but I'll add it to my list of ideas.

[@gg-gn3re]

@@DavidPozEnergy ah I see thanks. I always thought they were actively keeping them balanced, not letting some drop off in voltage =[ maybe more expensive ones do

[@phillipleekit9463]

Where did you get the batteries

[@TrackGeeks]

You may be costing me some money with this video. I thought we were friends!! :D

[@DavidPozEnergy]

LOL

[@worskaas]

Does the BMS come with active balancer? Would it make a difference?

[@DavidPozEnergy]

The BMS has a balance function built in. This BMS uses resistors for balancing, which is usually referred to as "passive balancing". The BMS will eventually balance the cells on it's own, but I sped up the process with an I-charger.

[@sujaybhakat2548]

High Voltage dc batter and inverter video please

[@seanathanq]

i would love to see this because i have to use high voltage with my SMA inverter, sadly there is almost no info out there on them.

[@jl9678]

Hi! How is the plywood mounted to the server rack? Thanks

[@DavidPozEnergy]

I used 2" angle iron as shelf brackets.

[@jl9678]

Thanks!

[@tiloalo]

90% capacity, but if they're 8 years old you might only have a few years left in them. Also 10% loss is already a big degradation, would indicate that the cell already went through a lot of cycle or are already quite old. Woul be good to see if the original qr code is still on the cell to see when they were made (there is an android app to decode them). Unfortunately might be hard since they're soldered, which also make it impossible to replace a single cell should one go bad.

[@ericklein5097]

Yep that was my thought. These things will pull 290'ish amp hours new.....so at least 1000 cycles?

[@rustuslandon5612]

They were more than 99% of the capacity.

[@offgridprep]

Link is not working says page not found on the batteries

[@phillipleekit9463]

Where did you purchase thr xatl battery