Calculate your roof price by entering only the total square meters of the roof and the desired production Watt Peak (Wp).
Production in Watt Peak should roughly correspond to 60-80% of the total kWh consumption per year. Example: If you use 10,000 kWh of power per year, you should dimension the production to 6000-8000 Wp (6-8 kWp solar cells) at the low end, if you have an electrically heated house, as you have more consumption outside the solar production seen during the year. Higher for other heating installation, or for electric car and or battery solution connected.
1000 Wp provides approximately between 800-950 kWh per year, depending on direction and slope.
The roof complete with installation, will usually be paid for by the solar cells electricity production within 18-22 years. The solar cells will be paid for after 4.7-10.5 years depending on country, electricity price and so on.
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