I would take a long hard look at the condition of your batteries and the quality of your inverter. Seems like combining the amps of both the inverter and house bank if you were replacing batteries and the inverter would make for a very nice, much simpler setup. Obviously, this requires making the inverter and it's batteries 12 volt. On my boat (single engine) I now have a 900 amp golf cart battery back, 30 amp inverter / 160 charger, and a second alternator (Leece Neville 220 amp with 3 stage regulator) for house and inverter bank. The engine and genset have their own batteries and alternators. If I'm running the genset, I can easily take the extra capacity of the genset to charge the battery bank through the inverter/ charger. Also have a battery switch that allows combining of the house and engine battery, to either jump start the engine or charge either battery in the event of an alternator failure.
Ted
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