I used to get by with a 650 watt XANTREX PSW in my old 37' fiver with 4 Trojan T-105's. You are right, that you have to turn off the converter breaker and don't forget to change the fridge and water heater to gas. Just have to keep in mind where your limitations lie. Items like the microwave, toaster, crock pot, electric skillet and electric coffee pot are items I would sure try to avoid. Use only what you need and turn off any tv or lights when you really don't need them. It may surprise you how little you can get by with if everybody cooperates.