I have been collecting and processing cells for a diy powerwall for a while and I recently scored 100 4p4s 5.6Ah packs - 8kwh!. They have unbranded cells but are in mint condition as they were backup batteries from emergency signage that require replacement every 2years, so barely a cycle on them.
Background: This is a long term project with the intention of finishing it to coincide with renovating my house and finally getting solar hopefully by xmas. So I don't have an inverter yet (or anything else).
So now I have these 4s batteries (and the possibility of getting more of the same) it feels a bit mental to break them all down and process them. Should I:
A. Just harvest the cells
B. Put them all in parallel for a giant 4s battery
C. Build a 12 or 16s battery
My first instinct is C, but would this even work with the existing bms's? B would certainly be the easiest and neatest but that is going to be a huge amount of amps if I end up with 20kwh.
Any suggestions? It's a good problem to have I know
Cheers,
Pete
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Background: This is a long term project with the intention of finishing it to coincide with renovating my house and finally getting solar hopefully by xmas. So I don't have an inverter yet (or anything else).
So now I have these 4s batteries (and the possibility of getting more of the same) it feels a bit mental to break them all down and process them. Should I:
A. Just harvest the cells
B. Put them all in parallel for a giant 4s battery
C. Build a 12 or 16s battery
My first instinct is C, but would this even work with the existing bms's? B would certainly be the easiest and neatest but that is going to be a huge amount of amps if I end up with 20kwh.
Any suggestions? It's a good problem to have I know
Cheers,
Pete
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