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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.
As battery capacity is measured in A/h (amp-hours), you need to know the solar panel current to estimate how quickly it will charge your battery. For example, A 100W motorhome solar panel normally produces 4-5A per hour in bright sunshine.If you have a 100A/h battery, this will take approximately 100/5 = 20-25 hours of sunshine to charge from 0% to 100%. The current of 12 volt solar panels or charging kits is typically proportionate to their wattage.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.