How it works

When you order a solar energy calculation you need to submit:

  • Your place in the world
  • The energy consumption (in kWh) that you wish your solar power system to supply you with during each day
  • Which months of the year you wish your solar power system to work without problems (more solar panels and batteries are needed for it to work during winter time)
  • How many days of cloudy sun free weather you wish your system should be able to handle, without the batteries being fully discharged

You fill out these options at the page “Specify your order”, which you arrive at by clicking the basket at the top right in the meny. Your solar power system is then dimensioned by Sunny off-grid and an electrical simulation is performed in order to verify that the system works for the conditions you have specified.

Example: 2 kWh in Madrid

If you click the link below you can see an example of the PDF document that you receive, in which your dimensioned solar power system is presented. In this example an off-grid solar power system for Madrid in Spain is dimensioned, which should be able to provide 2 kWh of electrical energy per day. The solar power system should be able to provide this energy even if it the weather is cloudy for 10 days in a row, for the months May to August.

 Example calculation

Another example: 2 kWh in Mumbai

The simulation results have been verified

The simulation results of Sunny off-grid have been compared with simulations of possible solar power production around the world (see this graph), done by the World Bank. The results were almost identical, deviating only about 5 to 10 percent.