My boat has been out of the water
for a year. I've noticed recently that the battery
bank 1 is quite low, it's normally charged by a small solar
panel but that doesn't seem to be working. The solar
panel feeds into a solar regulator
with dual outputs to battery
banks 1 and 2. Battery bank 2 was registering nearly 14 volts in the daylight today but I don't know why battery bank 1 isn't charging
. Maybe the solar output for battery bank 1 shorted out, or maybe battery bank 1 is just too big--it's about 280 Amps, whereas battery bank 2 is perhaps 90 Amps.
So I thought I'd plug
the boat in and charge it. There are no boat size outlets but I used an orange 100ft extension cord plugged into a regular household style outlet on one side, and with the help of an adapter, into the boat's 30A socket at the stern. When I flipped the switch on the permanently installed battery charger
(I don't remember the make/model, probably the original one that came on my 1987 Beneteau), battery bank 1 came up to about 12.5 Volts from about 10.5 where it was in the morning. But it never went higher than 12.5V. Does that mean the charger
is not working properly? Could the fact that I'm not giving the charger 30amps make it malfunction
? (I think the adapter limits it to 15amps). Once I unplugged the boat after about 5 hours, the voltage immediately dropped to around 11.8V. Battery bank 1 contains two group 31 batteries that are each about 1 year old.