diy solar

diy solar

Bench charger spark when connecting to battery

JJJJ

Aspiring apprentice
Joined
Feb 25, 2021
Messages
1,026
I have been using a 10 amp bench charger to top off my battery packs.

I recently charged a bank that was depleted per the bms settings. When I hooked it up, there was no spark and the charge went as expected.

Later I hoped to top off a bank that is riding at about 80 percent per the bms. When I went to attach the second lead there was a spark. The bms continued to function. The bench charger was turned off but plugged in in order to keep it grounded.

I tried unplugging the charger to deenergize it but still got a spark.

In both cases I also tried a resistor, however no luck.

Any suggestions?
 
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