Calculator library

Solar and battery calculators

Each tool answers a different planning question. Inputs are processed in your browser, and every result lists the losses and assumptions used.

Battery sizing

Work from energy use, appliances, or a battery you already own.

Turn daily energy and backup days into nominal kWh, Ah, and an integer battery layout.

Estimate how long an existing battery bank can run an AC or DC load after real losses.

Build an appliance list and size the energy storage needed for an outage.

Check how series and parallel connections change voltage and amp-hours.

Check voltage, Ah, energy, battery count, and the shape of a series-parallel layout.

Move between energy demand, array size, and expected output.

Estimate array watts and panel count from energy use, peak sun hours, and losses.

Estimate daily, monthly, and yearly energy from an array you already have.

Combine load, storage, and solar requirements in one scenario.

Plan RV loads, battery storage, solar panels, and a controller current baseline together.