Originally Posted by meridian28
Iíve got 4 6-volt 200amp batteries
set up as 2 12-volt units tied together for a total of 400 amps. One battery has failed and will not hold a charge. Iíve taken that battery off-line and want to connect the good battery to one of the other two, pos to pos, neg to neg. what will happen when I go to charge? Will they be balanced? Iím in the Bahamas
and canít get a replacement battery
The pair linked together will take a lot more time to charge than the single
6v it is in series with, so it will always be behind in voltage when charging
and the single
battery will see much higher charge voltages, tearing it up. Your charger
will not know and see that the whole bank is low on voltage and will keep charging
, overcharging the single battery and under-charging the double one continuously.
The single battery is still limited in the AH it has so adding that 3rd battery on half the series circuit is not going to bump your overall bank AH much at all. If you try and utilize that tiny bit of extra AH its going to draw that single way down below the optimal 50% level before the double battery gets even close.
You will be better off just using two batteries.