Hank, I think it's more important that your battery
bank is large enough to handle the 100+ amp draw without voltage droop. My 120v toaster and microwave can each droop my bank to 11v or less, so I generally only run them when the generator
As such, the inverter handles computer and other battery
chargers, my printer, etc. and doesn't have to work near its capacity, hopefully will last a long time. I'd go with the 1500W if you have the budget
and space. Remember that run near its max, the inverter will generate a lot of heat that needs to be dissipated or it will overheat (good ones will cut out).