Use this handy calculator to estimate PV Wattage needs for your off grid RV activities and don't worry about electrical hook-ups.
The Amps listed below are estimates for typical electronic gear and appliances. You may alter the amp number to suit your actual appliances and equipment. Then, enter the number of hours, or fraction thereof as a decimal, that you estimate using those items during a typical day out on the water. Scroll down to "calculate" your estimated solar panel watt requirements.
The default below is set to 5 hours of direct peak sunlight per day, and you may also edit this data field as needed. You may get more or less direct sunlight, depending on your geographic location.