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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.
Here's how NREL describes it: 1  A large fixed tilt solar PV plant that generates 1 gigawatt-hour (GWh) per year requires, on average, 2.8 acres for solar panels. 2  This means that a solar plant that provides all the electricity for 1,000 homes would require 32 acres of land.nswer: About 32 acres of solar PV. That's one of many nifty facts in a National Renewable Energy Lab (NREL) analysis of how much land is required for various kinds of solar technologies.