Question about Onan Generator
Something I have never understood about generators (I have an Onan 6.5 Emerald III.) A 12-volt DC battery is used to start the generator, which then produces 120V AC. The battery supplies the energy ...
Forum Discussion
Many RV's have an "AUX BAT" or auxiliary battery switch somewhere on the dash. The purpose of this switch is to temporarily connect the house batteries to the chassis battery(s). When you press this momentary contact switch, provided there is adequate voltage/current available somewhere in the system to operate the relay, you now have the benefit of ALL the system batteries linked together for the purpose of starting the coach engine, or the generator. Often this is enough "juice" to get you out of a jamb.
As others have said, the generator will automatically charge the house batteries through the battery charger built into the converter when running, but generally, it will not charge the chassis battery unless the "AUX BAT" switch is pressed. (not recommended for long term charging)
That said, I often hook up a separate 12 volt (automotive type) battery charger to one of the house 120 Volt outlets to top off the chassis battery if/when the generator is running.
When you start the chassis engine, generally, a few seconds after starting, you will hear another relay engage which now connects the chassis and house batteries together so that you can charge all the batteries while underway using the main engine alternator. (it takes a long time/drive to do this if the house batteries are low)
Chum lee
As others have said, the generator will automatically charge the house batteries through the battery charger built into the converter when running, but generally, it will not charge the chassis battery unless the "AUX BAT" switch is pressed. (not recommended for long term charging)
That said, I often hook up a separate 12 volt (automotive type) battery charger to one of the house 120 Volt outlets to top off the chassis battery if/when the generator is running.
When you start the chassis engine, generally, a few seconds after starting, you will hear another relay engage which now connects the chassis and house batteries together so that you can charge all the batteries while underway using the main engine alternator. (it takes a long time/drive to do this if the house batteries are low)
Chum lee
