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You couch battery is charged by your converter, while on shore or generator power.
Both shore and generator power are basicly the same 120 volt AC power.
If you are driving, your couch battery is charged by the engine battery, charging system. There is a relay that connects the batteries together when the engine is running.
If your coach has a solar panel on the roof, I believe it maintains a charge on your house batteries independent of the other charging metods already mentioned.
If this is a motor home, can you clarify which batteries you mean? In the RV world, house batteries are what run the house, chassis batteries are what start the engine. I'm not sure which batteries in the coach your "coach" batteries apply to.
If you do much boondocking you may want to install a battery combiner that will send charging juice to your chassis batteries ( engine batts) when a charging source is present , I.e. Generator or solar. That way your batteries won't drop dangerously low when sitting for a few weeks. I use Magnums Smart Battery Combiner but there are less expensive units out there.
__________________ Stan & Jacquie 2007 Monaco Knight DFT 40', 750 watts Solar
2012 Equinox w/Air Force I, Blue Ox Alpha & Base.