confused about my RV house batteries

Modern converter chargers have quicker recharge and maintenance modes but will not recharge a discharged house battery in a few hours. The engine's alternator charges the house battery(s) more quickly while driving some distance, but running the engine for an hour won't do much. How long recharging takes will vary with the converter charger, condition of batteries, and amount of miles/driving time. Stock house battery setups will usually power interior lights and appliance controls for up to 3 days without running the furnace blower. RV's are designed to work on shore power in RV parks, not set up/equipped for off grid camping.