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  1. DIY Powerwall with 18650 batteries

    Sure, I built a roughly 17Kwh 48v battery pack from 18650 batteries which I recovered from used battery packs , there are 14 packs in series and each pack is made up of 182 batteries in parallel. Each 18650 cell has a capacity of approximately 1800mAh. Each cell is soldered to a buss bar with a fuseable link . As soon as the budget allows I'll add a BMS but in the mean time I keep a close eye on the battery pack voltages.
  2. DIY Powerwall with 18650 batteries

    So far very well. Six months down the line the packs all stay well balanced and it hasn't burst into flames . It delivers the power I need and I couldn't ask for more
  3. DIY Powerwall with 18650 batteries

    I've seen a cellphone battery explode while being charged, the phone ended up up on one side of the room and the battery casing embedded in ceiling. And people still charge them next to their beds when going to sleep. Still there is tons of info out there on how to build your own powerwall and make it relatively safe. Recycle and reuse a stack of batteries that would otherwise have ended up in a land fill and have a relatively cheap Li ion battery pack, that suits me quite well.
  4. DIY Powerwall with 18650 batteries

    Check with companies who recycle/scrap electronics. You'll probably pay some where between R20 and R50 an old laptop pack
  5. DIY Powerwall with 18650 batteries

    It took quite some searching but I ended up getting a pile of the same cells from someonewho was scrapping some electronics. I haven't got a BMS yet but that's on my list. Fortunately as they are all of similar capacity the keep themselves quite well in balance within about 0.08v of each pack. As for the capacity and performance , I had a 48v set of batteries from a forklift and the Li-ion battery works extremely well compared.
  6. DIY Powerwall with 18650 batteries

    But your cell phone and laptop etc all with diffrent lithium battery chemistries and no fire as of yet I take it. Talking about things that go bang what about the off gassing from the lead acid batteris in a small room . There is a potential for a lot of things to catch fire and worse. If it goes wrong Li-ion cause a nasty fire and there isn't too much you can do to stop it . Use a bit of common sense , like you said don't put it in your house , don't use dodgy batteries and keep an eye on the battery packs and all should be fine
  7. DIY Powerwall with 18650 batteries

    It's doable , very time consuming breakung up packs , charging , discharging, testing , waiting and then test again. It took me about about 4 months to put together a 182p14s182p 14s 17Kwh battery pack.