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diy solar

diy solar

REPT CB56 from NKON problem

skibidipop

New Member
Joined
Jan 12, 2025
Messages
2
Location
Croatia
I bought 16 cells for diy battery.. REPT CB56 100Ah from NKON. And a Jiabaida SP17S005 100A BMS from aliexpress.

I didn't top balance the pack all the way because I don't have a low voltage high power source.. I can only push about 30W with my charger and it would take 8 days for it to charge.. But I had to go to my off grid house this weekend so I thought I'd just charge the pack with my solar hybrid inverter charger.. I have set it all up and started charging with a gasoline generator through the inverter and one cell was constantly going into overvoltage

Is this just bad luck and I got one bad cell.. Did I do something wrong?

I did compress the cells before charging.. I have used this BMS once before and it worked fine..
 

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That doesn't look good at that low of voltage. You don't usually see one that bad unit the pack voltage gets higher into the knee. 3.7V is BAD Mojo to be at.
 

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