Free Solar & Renewable Energy Calculators

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Calculate solar panel count, system size, roof space, output, tilt angle, and shading impact.

Battery bank sizing, charge time, inverter, charge controller, and usable capacity calculators.

Payback period, ROI, monthly savings, net metering, tax credits, and LCOE calculators.

Off-grid load planning, system sizing, generator backup, solar water/pool heating, and EV charging.

Calculate how many solar panels you need based on your electricity usage and location.

Calculate how much roof area you need for solar panels and the maximum number of panels that fit your roof.

Estimate daily, monthly, and annual kWh output from your solar system based on size and sun hours.

Calculate the battery capacity needed for your solar system based on daily usage and autonomy days.

Calculate the right inverter size based on your total load and surge requirements.

Calculate total battery system cost based on capacity, chemistry, and installation.

Calculate how many years it takes for your solar system to pay for itself through energy savings.

Calculate the total return on investment for your solar system over its lifetime.

Calculate your monthly and annual electricity savings with solar panels.

Calculate your federal ITC and state solar incentives to see your true out-of-pocket cost.