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What size solar panel for rv battery

The general rule of thumb is that a 100-watt solar panel can produce about 30 amp-hours per day, so you can use this guideline to determine about how many panels you need. Another suggestion is to match your battery capacity in amp-hours with your solar output in watts.. The general rule of thumb is that a 100-watt solar panel can produce about 30 amp-hours per day, so you can use this guideline to determine about how many panels you need. Another suggestion is to match your battery capacity in amp-hours with your solar output in watts.. The size of solar panel you will need for your RV battery will depend on battery capacity, panel efficiency and energy use per day. At a minimum, you will likely need at least two panels of 100 watts each. [pdf]