Hello everyone,
I'm new in this forum and i've got i question about the exide A602 solar batteries:
I've installed a multi plus II 3kVA with 12 single cell batteries to reach 24 volts.
I set the absorption voltage to 28,2V (2,35V/Cell) and the float voltage to 27,6V
In absorption phase, one cell reached 2,5V-2,55V, so i stopped charging, because i'm scared do damage the cells.
Does anyone know if this is normal, should i continue charging the cells?
Thanks
Regards, Dominik
Guessing these aren't lithium, but a lead based chemistry. Ideally they should be fully or equally charged before installation.
Small imbalances will even out at float voltage. But not ideal here. I guess you have no suitable charger for the individual cells. Suggest you connect a load like a light bulb across the high cell, lower it's voltage. Then restart the charge. But check voltage after the cell has rested for a while. You may need to do this with other cells. It's going to take a while, sorry.
Hey,
Yes, i don't have a charger for charging them seperatly. If I check the Cell Voltage, when it's idle (not charging\not discharging) for a while , there is almost no difference between the cells (<0,01V).
I also think there ist a small im balance between the cells.
Now, i plan to do the following:
-> charge the batteries in float mode for a longer timer period to even them out.
-> if one cell is to high, i will discharge them with a small resistor like you described.
i also found in a Victron Mppt manual some interesting information:
theres an "equalization mode", where the cell voltage is up to 2,65V/cell (31,8V)
So in conclusion, my cell with a voltage of 2,55V should be fine or am i wrong?
Regards
Dominik
Only use equalisation if recommended by the battery maker. It raises the voltage a lot and will lead to premature battery ageing.
@dominikmp The Victron absrop and float voltages above seem to match up with this Sonnenschein manual. Seek advice before equalizing your batteries above the recommended bulk / boost / absorp voltage.
