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CEG calculator

Solar panel sizing from consumption CEG

Yields used: North 1100, Centre 1300, South 1450, Islands 1500 kWh per kWp per year.

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How many panels you need

Yearly bill, zone and module power.

Enter numbers without thousands separators: write 3000. Results use English formatting, for example 3,000 W and 3.5 kW.

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Total kWh on the bill over one year. Example: 4,200 kWh.
Unit: kWh/year
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Specific yield used: North 1100, Centre 1300, South 1450, Islands 1500 kWh per kWp per year.
Estimated average yield for the zone
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Power of one module. 430 Wp is a common current size.
Unit: Wp
Have a site-specific yield estimate?
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Optional: annual yield for your actual site, in kWh per installed kWp, including estimated system losses. If entered, it replaces the regional average. Do not enter total annual production here.

Open the European Commission’s PVGIS tool

Assumptions: kWp = yearly use ÷ zonal yield. Modules = kWp × 1000 ÷ Wp, rounded up. No shading and no extra performance-ratio cut.

Understand this estimate

Panel count is rounded up. Matching annual energy does not mean daily independence: production and consumption may occur at different times. Regional yield is estimated; you can replace it with a local value.

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