Libreng solar calculator

Build an appliance list to estimate daily electricity use and connected load.

Estimate your solar array, continuous inverter output and battery storage together.

Estimate the daily solar energy available for air conditioning.

Estimate pumping energy, flow and solar array capacity from water demand and head.

Calculate the solar energy and panels needed for your daily driving.

Turn daily energy demand into an array rating and a whole number of panels.

Estimate panel surface area and a preliminary roof-space allowance.

Get a latitude-based fixed-tilt starting point for a solar array.

Estimate electricity production from your local sun-hour assumption.

Calculate array voltage, current and power for identical modules.

Size nominal storage for your backup load, duration and usable battery depth.

Estimate how long your existing bank can run a steady average load.

Compare nominal battery sizes under editable chemistry assumptions.

Estimate charging duration between two battery charge levels.

Separate continuous power, apparent power and short starting surges.

Screen one MPPT input against temperature-adjusted string voltage and current limits.

Compare your upfront cost with projected savings over a chosen period.

Compare total spending over 5, 10 or more years, including your remaining grid bill.

Model self-consumption, grid imports and export credits using your own rates.

Add your local equipment quotes and installation expenses in one currency.

Estimate fixed monthly payments and total financing cost.

Compare added battery cost with savings from shifting surplus solar into later use.

Estimate conductor area for a chosen DC voltage-drop target.

Check cold string voltage and estimate input and battery-side current requirements.