Dick,
These coaches have inverter charger systems that should maintain the batteries when plugged in. If you are plugged in, take a DC voltmeter and measure across the house and chassis batteries and see what the voltage is. If of over 12.6, they are already being charged. The chargers you are looking at are small and meant mostly to handle small batteries like motorcycle batteries, and have less than 1 amp of output. They will not do the job, given the coach with everything you can manually turn off, in the off position, will still have more current draw than these chargers can put out. Usually there is an echo charger for the chassis batteries or a solenoid coupler, that connects the banks when the voltage is appropriate to do so. The inverter charger system keeps the House Bank charged, and the coupler or echo charger handles the chassis batteries.
Later Ed
