Our Haier residential fridge runs fine on a Samlex 600 watt (1200 watt surge) PSW inverter with just two Group 29 batteries. The max running watts is about 240 (2 amps) and the max starting watts is about 720 (6 amps). The same two batteries run all the other 12-volt devices in our coach. The residential fridge run time is much lower than our RV fridge was. A daily 2 hour generator run tops the batteries up easily when boondocking. If we did more boondocking, I would invest in a solar system, but that's not likely at this stage of our RV'ing life. I should also mention that before I installed the fridge inverter, we had no problem driving up to 6 hours a day without the fridge temps going up significantly. Our typical drive time is usually no more than 4 hours though, so there really wasn't any need to keep it powered while underway.