How many panels fit on 100 m² of roof?

With the calculator’s starting assumptions (60% usable, 450 W panels of 2 m²), 30 panels, or 13.5 kWp. A real roof may take fewer, because of shade and obstacles.

How much energy does 1 kWp make in a year?

It depends on the location, the orientation and the tilt. PVGIS gives you the value for your location. The calculator starts from 1,200 kWh, an assumption you can change.

Can I do the calculation by address?

Yes, in baseray: the building shows the panels already installed and, where the roof has been modelled, the number of panels, the power and the yearly yield.

Solar panel calculator by roof area.

Type the roof area and see how many panels fit, the installed power and how much energy they make in a year.

Check an address Open the live map

Existing solar panels5th Avenue 120, Brașov

Verdict: None seen
Photo date: 8 Sep 2022
Model confidence: 0.988

Roof analysisPark Lane 12, București

Max panels: 224
Capacity (kWp): 89.6
Yearly energy (kWh): 108,025
Usable roof (m²): 439.8
CO₂ avoided (kg a year): 25,278

Analysis confidence0.95

Calculate. The result changes as you type.

Result

30 panels

Installed power (kWp): 13.5
Energy a year (kWh): 16,200

The starting values are typical assumptions. The result is an estimate, not a quote: it does not account for shade, orientation or the roof’s structure. PVGIS gives the monthly yield for your location, free.

The same calculation, on the real roof. Without climbing up.

What is already on the roof

A model reads a dated aerial photo of each roof and answers: detected, none seen or unclear, with the date of the photo.

Panels, power and yield

Where the roof has been modelled: the maximum number of panels, the power in kWp, the yearly energy and the usable area, marked as estimates.

The largest roofs first

Sort the buildings in your area by footprint, so the large roofs come first.

The company at the address

For commercial buildings, the companies registered at exactly the building’s official address.

From a roof to a quote. Three steps.

01

Find the building

By address or straight on the map.
02

Read the roof

The panels already there, with the date of the photo, and the yield, where the roof has been modelled.
03

Check the site

For a quote, PVGIS gives the yield for the real orientation and tilt, and the installer measures the shade on site.

Solar panel questions. What the record holds, and what it does not yet.

How many panels fit on 100 m² of roof?: With the calculator’s starting assumptions (60% usable, 450 W panels of 2 m²), 30 panels, or 13.5 kWp. A real roof may take fewer, because of shade and obstacles.
How much energy does 1 kWp make in a year?: It depends on the location, the orientation and the tilt. PVGIS gives you the value for your location. The calculator starts from 1,200 kWh, an assumption you can change.
Can I do the calculation by address?: Yes, in baseray: the building shows the panels already installed and, where the roof has been modelled, the number of panels, the power and the yearly yield.

Bring baseray to your territory. Tell us your regions and what you sell. We load the data and build your first segments with you.

Open 5 buildings free Open the live map

No card needed. After that, plans from €39 a month.