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trotline · 12-05-2020, 12:49 PM

From an electrician...

Some people refer to the coach battery as the house battery. Whatever. It is simply NOT the engine battery. The coach is whatever is built on the chassis for living space.

Coach battery is the 12v system for the Coach. Its battery is connected to the CONverter for 110v converted to 12v for charging. That means shore(110v ac) or generator (110v ac) power will charge the 12v coach battery. Note: The generator or shore power does not charge the engine battery.

INverters do the opposite. They convert 12v battery to 110v AC. I carry one to operate a 100v CPAC at night when we are not on shore or generator power.

Engine battery is the engine battery. Period. It is like your car. Jump it off if the engine won't start. When the engine is running it will charge the Coach battery the same as it charges its own engine battery. Some Rvs have a switch that will connect the coach battery to the engine battery to assist (jump) off for starting.

I hope that helps.

12-05-2020, 12:49 PM	#11
trotline Member Join Date: Mar 2019 Location: On Road Posts: 40	Batteries explained by electrician From an electrician... Some people refer to the coach battery as the house battery. Whatever. It is simply NOT the engine battery. The coach is whatever is built on the chassis for living space. Coach battery is the 12v system for the Coach. Its battery is connected to the CONverter for 110v converted to 12v for charging. That means shore(110v ac) or generator (110v ac) power will charge the 12v coach battery. Note: The generator or shore power does not charge the engine battery. INverters do the opposite. They convert 12v battery to 110v AC. I carry one to operate a 100v CPAC at night when we are not on shore or generator power. Engine battery is the engine battery. Period. It is like your car. Jump it off if the engine won't start. When the engine is running it will charge the Coach battery the same as it charges its own engine battery. Some Rvs have a switch that will connect the coach battery to the engine battery to assist (jump) off for starting. I hope that helps.