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r/diybattery

▲ 2 r/diybattery

Large Battery setup help

Hello all. I plan to setup an very large battery for my solar system.

I have found a pallet of these 628 Ah LiFePo4 cells and i wanted to setup a 16s4p setup to give me a 51.2 v nominal and roughly 128kw battery for my offgrid home. I only wanted to use one bms and my question is how do i wire this. I was thinking of having the paralell connections as one cell wired to the bms all the way for the 16 s setup. If that makes sense. Is there a better or more propper way to do this?

I can of course just have 4 bms and treat each as their own back the paralell them together but if i could save the money and use one bms i would like too since the ballet of batteris is already $10,000.00.

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u/njor54 — 4 days ago
▲ 4 r/diybattery+2 crossposts

How to test used batterypacks+inverter, Solax

Hi there!

I have a very basic understanding og electrical systems. I trust myself to solder basic things and use standard basic connectors, but thats about it.

I am looking at aquiring a few battery modules and an inverter from the Solax brand for a new project. All the units are pre owned and I need to test them asap after purchase.

How do I best go about doing this? Preferably with the use of 1-phase power socket, but I understand that this might not be possible.

Inverter: x3-15.0p-t-d

Batterypacks (two units): hv10063

Also, for the the actual install I will aquire the help of professionals since I understand that its a high voltage system and I want my insurance to cover.

Thank you!

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u/Frosty_Dish_5213 — 7 days ago
▲ 2 r/diybattery+1 crossposts

What can I do to make any of this useful?

https://imgur.com/a/2LlyjtV

What I have that I don't know what to do with

  • 64x 18650 cells (3.7V, 2.2Ah, 8.14Wh each, 520.96Wh total).
  • 2x https://www.amazon.com/dp/B09S3LZN2Q?th=1
  • 1x https://www.amazon.com/dp/B09S3JRFDF?th=1
  • Daranener NEOZ with a bad BMS (won't charge, blinking blue LED on the board inside), but the battery cells seem good.
    • Outside of Power Station, the pack is reading around 18V
    • The batteries are 14x 26700 cells (3.2V, 14.4Wh each, 201.6Wh total) in what looks like a 7s2p configuration.

I'd like to make use of these cells in a cost effective manner.

I have a Pecron F3000LFP which is possible to add a 3rd party expansion battery to, if you build a custom terminals-breaker-XT120 cable to connect the battery and Pecron.

Ideas with limitations

  • I could buy two more snap-in PCBs and make one large 12V Power Bank, that I don't really have a use for. ~$40
  • I could buy two more snap-in PCBs and three more BMSes to create 4x 12v packs, put them in series for 48v, and connect to the Pecron. Super Jank. ~$120-$140
  • For 2x the price of doing the above, I could just buy a 48V 25Ah battery for the Pecron. Doesn't actually solve the above issue. ~$225+
  • I could just buy a spot welder. But then I'd have all these cells and a spot welder and still not have a use for the cells. $50+
  • Build new power station with the 26700 cells, but the rest of the components are usually the more expensive aspect.
    • Either the components of the Daranener aren't salvageable (custom PCB with everything on it), or I'm not knowledgeable enough to reuse them.

What I don't need them for

  • I already have 6-10 more 18650 cells for headlamps, Raspberry Pi projects, ESP32 projects
  • I already have a server UPS that is the backup for my modem+server rack
  • I already have too many power banks so don't need to make another.

Or do I just sell off the cells + PCBs?

I feel like I'm in between having too few cells to justify a spot welder for a bigger battery project and having too many cells for just making a simple power bank to charge my phone/laptop.

Thanks in advance

u/bigrjsuto — 11 days ago
▲ 1 r/diybattery

Looking for a suitable bms

I'm attempting to build a battery out of gen 2 nissan leaf modules and I'm having trouble finding a bms that would work. the battery will be made up of 10 modules in series (each module is 2 ~4v cells in series) so a 20s configuration will hopefully give me around 76v nominal and 55ah. The bms also needs to be able to handle around 200a continuous discharge. I'm new to battery building so any information or recommendations would be much appreciated.

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u/FlyFlicka — 14 days ago