Use our Off-Grid solar calculator tool below to estimate system size. Simply follow the steps and instructions provided below. . To size your solar panel, calculate your daily energy use in watt-hours and divide it by the peak sun hours in your area. A small cabin might need a 400W panel, while a larger one could require 1200W or more. The UK and North USA get about 3-4 hours. This free DIY solar calculator makes it simple to estimate the size of your solar array, the number of panels, battery storage, and the inverter. . Check the wattage of each device and estimate how many hours per day it runs.
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