Hey, Everyone! So, I went for an afternoon ride today and ended up completely discharging my battery due to heavy winds on a route that would normally leave me with 30% or more battery left.
When I got home to charge the battery, the charger LED remains green and does not initiate charging. I checked the charger and the battery (showed 34.1V) with a multimeter, and power seems to still be flowing.
When I turn on the board while plugged in, the battery indicator rises to 100%, and falls rapidly to 0% when I unplug the charger. Could there be something wrong with the BMS or a battery cell group?
Is there anything further I can do to diagnose or fix this problem? Thank you!
Battery: 10s6p Samsung 30Q pack with a BMS assembled by @psychotiller
Okay. So I need some help with bypassing the BMS. Do I just charge with wire coming directly from the charging port to the positive and negative ends of the battery pack?
0% would be below 25V on your pack.
I discharge mine till 2,8V per cell without issues.
So it looks like it’s just below your bms setting maybe or your charger makes some crazy stuff.
Hmmm, my negative lead from my battery goes straight to the negative of the charger. I have already cut all wires coming from the negative of the battery pack to the BMS.
Shouldn’t the charger non the less charge?
I mean it’s a simple charger not a balance charger. This charger see only measure the input voltage not the cell count or anything else.
Even if a cell in the p group is bad (or one connection is bad) the over all voltage of the pack is still 34 something volt, which should be enough to make the charger charge. No?