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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.
Factors such as battery size, converter output rating, amps and battery discharge level determine the power requirement for an RV battery. For example, a 100A battery charger with a battery bank size of 600 and an 80 percent discharge level requires approximately 1.8 hours of power to fully charge. That number increases drastically if the discharge level drops to 20 percent, in which case the battery requirement is approximately 7.8 hours.