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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 'D' size battery has a 12,000 mAh or 12 Ah capacity. If you wire the batteries in series you'll have your 12 volts but a winch usually takes a lot of current. The bigger the load on it the more current it will take. Even a small winch such as for an ATV is rated at 0.71 horsepower.This equals about 530 watts and would need 44 amps at full load. cell batteries are about 4 amp, 8 will make 12 v this is 48 watts of available power. for a crane to lift a 1 tonnie load at 1ms-2 it must exert a force of 10810 newtons (M (a + g)).