We've had our 2002 DSDP plugged in whenever it's not used for 9½ years now. Still have the OEM batteries for both the engine and house. Have a Freedom 458 2000 watt inverter. It must be doing something right!
2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft, HWH Active Air
Charter Good Sam Lifetime Member, FMCA, SKP
RV'ing since 1957, NRA Benefactor Life, towing '14 Jeep JKU Dragon Edition