Going solar doesn't have to be confusing. 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 capacity you'll need. Whether you're powering a cabin, RV, tiny home, or just want backup energy, this tool gives you a solid starting point.
Controller A ≈ array W ÷ system V × 1.25. Estimates for planning only. Always verify against equipment datasheets and local codes. Enter your daily energy use in kWh. Add your peak sun hours (look this up for your location). Adjust efficiency, panel wattage, battery autonomy, and DoD as needed. Click Calculate to see the results.
Below is a combination of multiple calculators that consider these variables and allow you to size the essential components for your off-grid solar system: The solar array. The battery bank. The solar charge controller. The power inverter. Simply follow the steps and instructions provided below.
Select the nominal voltage of your battery bank. Select the lowest temperature that you expect your solar panels to be exposed to in daylight. Enter the number of solar panels wired in series. If you have multiple strings in parallel, enter the number of series-wired solar panels in each string.
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