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When you measure up the space you have available on your roof or elsewhere, you may find it difficult to capture the power required to run your RVâs house systems completely off of solar power. For a large motorhome, you might need 500 to 800 watts of power.
1) Sufficient Power Output. Obviously, peoplesâ wattage needs will vary depending on the size of their RV and particular creature comforts. Nevertheless, we think that the average RV user can probably live comfortably with a generator that produces about 2,000 running watts (and a few extra surge watts).