PV design tools
Free calculators for solar and off-grid projects
Practical calculators for solar and off-grid projects. Free, no signup. If there's one you'd use, tell us and we'll build it sooner.
Live
Appliance load calculator
List what you need to run and get total connected load, daily energy use, and a recommended inverter capacity that accounts for motor startup surge.
Open calculator →Live
Off-grid solar system sizing
Enter your daily load, pick a region, and get a starting point for PV array size, battery bank, inverter, and charge controller.
Open calculator →Planned
PV yield estimator
Rough kWh/year for a given array size and location, useful for early conversations with a client.
Planned
Payback and ROI
System cost, expected yield, grid tariff, and export price. Payback period and internal rate of return.
Planned
Battery autonomy
How many days of storage do you need at what depth of discharge, given your load profile.
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