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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.
2) How much electricity your household uses. The size of a solar PV system is typically described by its solar PV peak output (in Watts or kW) i.e. how much electricity it will produce on a perfectly sunny day, when the sun is at its strongest. So, a 1.5kW solar PV system will produce 1.5kW peak or 1500W peak.