use batteries while charging or no??

[hunterdave29]

Is it OK to run lights and forced air furnace on deep cycles while plugged into onboard (boat) charger? Will batteries be fine (not freeze) sitting in my icehouse if hooked to charger/maintainer?

[David Anderson]

It's ok to keep it hooked up but you should add up the power needed to run the lights and furnace. My friend has a onboard charger but his batteries kept discharging. His was a 6 Amp charger but adding the batteries and lights, it was taking over 10 amps of current. I suggest a 25 amp converter/charger, enough current to supply the house while plugged in and enough to keep the battery charged when you really need it. Your batteries will not freeze if fully charged and maintained providing there is no load.