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Running a microwave, refrigerator, or air conditioner off battery power takes an inverter that can handle real startup loads, not just steady draw. The Go Power! GP-3000HD delivers 3000 watts of continuous output with a 6000-watt surge rating and a modified sine wave output, plus four AC outlets so you can power several devices at the same time.
Size your battery bank and wiring to match the inverter's draw, and add the optional transfer switch if you want it wired into your RV's existing electrical system.