Whether a CONVERTER or an INVERTER/CHARGER, they work in conjunction with the Coach batteries. In real terms, the Converter is supplying the needed 12 volts and is trickle charging and keeping the battery/s fully charged. An Inverter/CHARGER just charges the battery bank and all 12 volt loads come from the batteries. The more 12 volt loads and the Inv/Charger may increase its charge output. An Inverter/Charger CANNOT operate without batteries connected. MOST Converters (with a few exceptions) can operate without batteries connected. Whether you can operate your Converter with or without batteries connected, it is BEST to have a battery connected to help the Converter to do its job better. Doug
