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. This RV solar sizing guide walks you through every step — from estimating your daily energy needs to choosing the right panels, batteries, and charge. . An off-grid solar system's size depends on factors such as your daily energy consumption, local sunlight availability, chosen equipment, the appliances that you're trying to run, and system configuration. Below is a combination of multiple calculators that consider these variables and allow you to. . How many solar panels and batteries do you need? What size inverter and charge controller does your camper setup need to function properly? Use this solar calculator to size your campervan or RV camper solar setup. (And unless you're the luckiest camper in the world or have discovered a way to control the weather, we guarantee you won't always have perfect conditions. For example, if your LED lights use 10 watts. .
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