My boat came with 2 generators. PO ran 1 24/7. Both had glazed cylinders from running with light loads. After rebuilds, I put in a 48v inverter that outputs 240/120, 48v alts on my mains, and a battery bank that allows me to run off the inverter for 3 days. The 48v alternators keep the battery bank up while running so only rarely do I run the generators. I don't need them when running and now only run one every other day to charge, make water, and do laundry. Sometimes done under weigh w/o the generator. Everything runs thru the inverter. So there's no transition from shore power. When the power goes off the inverter takes the load. When power comes back on, either shore power or generator, the inverter charges the bank. Wiring was simple and running is simple.