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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.
- 1 x 20W 12V water pump, used not more than 30min a day. Based on the above, the average daily power consumption will be 4*10W*3 + 40W*2 + 20W/2 = 210W/h (watt-hours). Once this estimate is available, it's very easy to decide on the size of 12 volt solar panel required for your caravan or motorhome.ur customers always ask us about the right size of solar panel to charge 12V leisure batteries in vehicles and boats. Unfortunately, based on our experience, there's no single right answer to this question. Solar panels for caravans, motorhomes and boats can all be very different.