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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.
Select a Size. How much power you'll need will determine what size of RV generator to choose. Start by looking around your RV for appliances that run on 120 volts. The RV air conditioner is usually the largest power requirement.WATTS = VOLTS X AMPS. You've established that you want your RV generator to run on diesel fuel, but you aren't finished yet. The next important factor in selecting an RV generator is figuring out how much power you'll need to generate.tart by looking around your RV for appliances that run on 120 volts. The RV air conditioner is usually the largest power requirement. WATTS = VOLTS X AMPS. You've established that you want your RV generator to run on diesel fuel, but you aren't finished yet.