beserker786 Posted November 18, 2020 Share Posted November 18, 2020 Hi guys I came across more second hand laptop Batterries if anyone is interested. I can give them to you for R10-R15 a laptop battery, depending on how many you take. I’m based in midrand. They’re perfect for DIY powerwall and small projects! there is too many for me to add to my power wall. Quote Link to comment Share on other sites More sharing options...
beserker786 Posted November 18, 2020 Author Share Posted November 18, 2020 (edited) Hi Stok. On average , when I tested, I had usually all were good, or 4 were good, or all were bad per pack. Depends on the pack. The average Mah can vary, but I managed to make about 3x 24V packs with about 280 cells, all above 2000mah, some closer to 3000mah. I’d say a definite good yield of about 50% cells made it to my power wall. Edited November 18, 2020 by beserker786 Quote Link to comment Share on other sites More sharing options...
beserker786 Posted November 18, 2020 Author Share Posted November 18, 2020 They’re still as laptop batteries. Sell them per laptop battery . The amount of cells depend on which battery it is Quote Link to comment Share on other sites More sharing options...
Pietpower Posted November 18, 2020 Share Posted November 18, 2020 (edited) 9 hours ago, beserker786 said: The average Mah can vary, but I managed to make about 3x 24V packs with about 280 cells, all above 2000mah, some closer to 3000mah. I’d say a definite good yield of about 50% cells made it to my power wall. How did you build a battery pack? Did you use a system from someone or from scratch? Edited November 18, 2020 by Pietpower Quote Link to comment Share on other sites More sharing options...
beserker786 Posted November 18, 2020 Author Share Posted November 18, 2020 So I 3d printed cell holders for the Batterries, soldered on the fuses, hooked them together 7p, got a 24V cell meter balancer. And connected the terminals to the battery connection on the inverter. I’d say tested the cells and built the battery from scratch. Pietpower and Richard Mackay 1 1 Quote Link to comment Share on other sites More sharing options...
Richard Mackay Posted November 19, 2020 Share Posted November 19, 2020 8 hours ago, beserker786 said: So I 3d printed cell holders for the Batterries, soldered on the fuses, hooked them together 7p, got a 24V cell meter balancer. And connected the terminals to the battery connection on the inverter. I’d say tested the cells and built the battery from scratch. Please post a pic of the final battery showing the fuses and balancer. Quote Link to comment Share on other sites More sharing options...
Richard Mackay Posted December 12, 2020 Share Posted December 12, 2020 These builds interest me more than the 'second life' batteries you can buy from the local Li battery suppliers. What I understand of these is they are imported from China as 'second life' and you pay good money for them. At least with the 18650 battery packs one gets them for nothing (or close) and you can sort the good from bad. What I need to know from those who have done this and built their power wall battery is what is the important criteria when sorting: capacity, internal resistance etc. ?? Quote Link to comment Share on other sites More sharing options...
beserker786 Posted December 12, 2020 Author Share Posted December 12, 2020 Hi Quote Link to comment Share on other sites More sharing options...
beserker786 Posted December 12, 2020 Author Share Posted December 12, 2020 Quote Link to comment Share on other sites More sharing options...
Richard Mackay Posted December 14, 2020 Share Posted December 14, 2020 I reckon these builds sort the serious enthusiasts from the ouks bragging about how big their systems are.. ('my system's bigger than yours..') The only thing I'm still trying to get my head around is how to maintain the individual cells (or the banks). How do you know their capacity has dropped or cells have died..? Quote Link to comment Share on other sites More sharing options...
Abe53 Posted December 16, 2020 Share Posted December 16, 2020 Hi Beserker, Yes, I need more 18650 cells, will buy laptop batteries untested. Abe53 ohaihtooninertoosixohfiveraightfiver Quote Link to comment Share on other sites More sharing options...
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