DIY Solar Calculator: Size Panels, Batteries & Inverter
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.
The Solar Panel Calculator uses your daily energy usage, local sun hours, system efficiency, and panel wattage to estimate how many panels you'll need. This ensures you generate enough power each day—especially critical for off-grid systems. 4.
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.
Higher is better for large systems. 12 V (Small systems) 24 V (Medium systems) 48 V (Large systems, 3kW+) If your daily energy usage is 2–4 kWh/day, you'll typically need a solar array of 600–1,000W —roughly 2–3 panels rated at 350–400W. Ideal for basic off-grid needs like lights, a small fridge, and charging devices.
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.
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.
Calculate your daily Solar needs and get recommendations for panels, batteries & inverter—all in one place!
Calculate how many solar panels you need with this solar calculator. Great for estimating the solar panels needed for a solar array project.
On this page, you can calculate your solar power requirements for off-grid systems. This is our off-grid solar power calculator.
Our Complete Solar System Calculator helps you accurately calculate your energy needs and design a fully customized solar power system in seconds.
Calculate your energy needs, panel sizing, battery capacity, and inverter specs with our free off-grid solar calculator. Ideal for cabins, RVs, and tiny homes.
Use our Solar Panel Size Calculator to determine the perfect panel for charging your 12V battery. Input capacity, voltage, and sun hours for results.
Calculate load, inverter size, battery capacity and panel wattage in minutes.
Whether you need a solar panel calculator for home, a solar panel calculator 12V for off-grid systems, or a solar calculator app alternative, our free online tool provides precise calculations in
Using your daily energy usage and Peak Sun Hours, and assuming a system efficiency of 70%, the calculator estimates the Wattage required for your off-grid solar system''s solar array.
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