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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.
Letâs take another example using a little more complicated way of getting to how large you need to make your solar array. Take your monthly kWh number (900kWh) / 30 days / month = 30kWh/day. What size array makes 30kWh/day? Now you know that this depends on peak sun, and we will again use for this example five hours. Depending on your location, 30kWh/day/ 5 peak sun hours = 6kW array, or 6,000 watts.