[BusNit]

I used a 2400 watt (overkill) buck converter to drop 60v to 13.8 for all the 12v house. I kept the merge switch and solenoid which now separates two engine start batteries and two generator start batteries. I maintain a redundant fail safe for generator and engine. Two or all four will crank the engine if needed. Sure wakes up that old iron quickly on 4! Buck transformer is aluminium finned device in pic. Maintenance charging of 4 12v engine batteries is handled by Victron 120v auto charger which is powered by inverter/solar/48v battery or shore.