Off-Grid Solar System Sizing Calculator
Use our Off-Grid solar calculator tool below to estimate system size. Check out our video on off-grid sizing for details and more information on the design process.
Total: 1,460Wh or 1.46kWh per day Use our Solar Array Sizing Downloadable Worksheet to log your devices and automatically calculate totals. Your location's solar potential—measured in average sun hours per day —determines how much usable power your panels will produce.
For instance, if you need 5 kWh daily and receive 4 peak sun hours, the array size would be 5,000 Wh / 4 hours = 1,250 W of panels. Adjust for inefficiencies (e.g., losses from inverters, shading, wiring) by increasing the array size by around 10-20%.
Solar systems typically operate at 12V, 24V, or 48V. Ensure your panels, batteries, and inverter all work together at the same voltage. When in doubt about compatibility, don't hesitate to call us! We're here to help you build a system that works seamlessly. Try different combinations of appliances in the calculator.
Now that you know your daily energy use and sun hours, it's time to calculate how large your solar array needs to be. Formula: Total Daily Use (Wh) ÷ Sun Hours × 1.25 = Solar Array Size (W) The “× 1.25” accounts for system inefficiencies (inverter losses, shading, panel age, etc.) Example: 1,460 ÷ 5 × 1.25 = 365W
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