This calculator sizes solar for businesses, industry and farms anywhere in the world. Choose your type of business: factory, textile unit, flour or rice mill, office, shop or supermarket, school, hospital, hotel or restaurant, cold storage, farm irrigation pumps, poultry farm, dairy farm, warehouse, petrol station, telecom tower, place of worship or water treatment plant. Then pick a size from 10 kW to 1 MW and your country.
You will see the kWh the system produces, the machines and equipment it can run on a working day, the number of panels, three-phase inverters, roof or ground space, and the CO₂ it avoids each year. Enter your monthly bill to see how much of it solar covers on site, what goes to the grid on weekends and holidays, and the right size for your use. Add your own unit price and installed cost to see savings and payback.
Business and industry solar calculator
Estimates use the formulas explained in this guide. Plan a complete system with the all-in-one calculator →
Why working days and daylight use matter
A business saves the full price of a unit only when it uses that unit itself. Solar made on a Sunday, a holiday or a slow afternoon is exported, stored or lost. That is why the calculator asks how many days a week you work and how much of your electricity you use in daylight. It then gives two sizes: one that covers your daytime use with almost no export, and one that offsets your whole bill if net metering is available.
Guides for businesses and farms
- Commercial solar system sizes: 10 kW to 1 MW
- Solar for factories
- Solar for offices and companies
- Solar irrigation and well pumps for farms
- Solar for schools and hospitals
- Solar for shops, restaurants and hotels
- Solar cold storage
- Solar for poultry and dairy farms
- Uses of solar energy: 30 ways solar is used worldwide