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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.
3. Know how many panels you will need for you system â To get the exact number of panels you will need, you must do this: 470.55 kWh / 125 watts = 3.76. So therefore, you will need 3.76, or approximately 4, solar panels measuring 59â³ x 26â³ x 2â³ to provide enough electricity to run your entire house.