Energy needs calculator
Estimate how much electricity you use in a year — at home, in an office, a shop, a factory or on a farm — and find out what size solar system you actually need. Results update as you fill in the form.
What are you sizing?
It is not only how much you use, but when. A business that runs during the day uses far more of its own solar power than a household that consumes in the evening, and for the same annual figure the right system is a different one.
Where it is
Estimated system yield
1.400 kWh/kWp
Your consumption
Always on
Kitchen and laundry
Entertainment and work
Climate and hot water
Additional loads
Your energy needs
2,3 kW
This is the share of your consumption the system covers at the moment you need it, without a battery. The rest of the production goes to the grid, where it is worth less than the energy you use yourself.
Take this size into the simulator to see costs, incentives and payback.
An indicative estimate, not a quote. For an analysis of your specific case get in touch
Where this consumption comes from
The items at the top are the ones worth tackling first — cutting a load is often cheaper than producing the energy to run it.
How we get to these numbers
Each item with its own model
A fridge is measured in kWh per year, a washing machine in cycles per week, an air conditioner in cooled square metres and months of season. Working them all out as «watts times hours per day times 365» is the fastest way to credit a fridge with half a household's consumption.
From consumption to system size
The recommended size is your annual consumption divided by your roof's yield, with a margin that brings production to about 125% of consumption: not all the energy produced is used the moment it leaves the panels. It is the same calculation the simulator and configurator use.
How much you would actually use
Every item declares how much of its consumption falls in sunlight hours and on how many days a year it runs. An office consumes during the day, but only 250 days: on Sundays the system just produces. That difference is what decides whether a battery is worth it.
These results are an indicative estimate, meant as a starting point. Your roof's yield depends on shading, actual tilt and local climate; consumption depends on habits and on how efficient your appliances are. A final design needs the building's real data.