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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.
A 12 Volt, 60 Watt panel makes 5 Amps of electricity, because Volts times Amps equals Watts. So it depends on how many Amp-Hours capacity your battery has. The Sears DieHard Marine Deep Cycle/RV Battery, Group Size 24M has a capacity of 80 Amp Hours.80 divided by 5 is 16. That means that at 100% efficiently a 5 Amp 12 volt solar panel could charge a 12 Volt, 80 Amp-Hour battery in 16 hours.But it is never 100% efficient. You can usually count on using maybe 25% more electricity to charge a battery than you can get back out of it.So count on 20 hours.0 divided by 5 is 16. That means that at 100% efficiently a 5 Amp 12 volt solar panel could charge a 12 Volt, 80 Amp-Hour battery in 16 hours. But it is never 100% efficient. You can usually count on using maybe 25% more electricity to charge a battery than you can get back out of it.