SolarScope
PVGIS

Location-specific irradiance · 25-year projection · Transparent formulas

Turn sunlight into a measurable investment.

SolarScope estimates your rooftop solar capacity, electricity production, financial savings, payback time, and environmental impact using location-specific solar data from the European Commission's PVGIS service.

Analyze My RoofSee the methodology

What you will get

Preview — no values yet
  • System SizekWp
  • Annual ProductionkWh / year
  • Payback Periodyears

Values appear only after a successful calculation with live PVGIS data for your selected location.

Solar calculator

Search your location, enter your roof and tariff details, and SolarScope pulls live irradiance data for those exact coordinates.

Project inputs

Enter your roof and tariff details. Monetary values use the currency selected below.

Currency

Enter your bill, electricity price, and installation cost in the selected currency. SolarScope does not convert exchange rates.

Powered by the Open-Meteo Geocoding API. Pick a result to lock in coordinates.

Shade-free area available for panels.

Average across the year, energy cost only.

Your all-in unit tariff.

Turnkey installed price per kilowatt-peak.

Methodology

Every number in the dashboard comes from these steps. Assumptions are editable in the calculator so you can test different scenarios.

  1. 1

    Electricity consumption

    Monthly kWh = monthly bill ÷ electricity price · Annual kWh = monthly kWh × 12

    Your bill and unit tariff are converted into an annual energy demand.

  2. 2

    Roof capacity limit

    Max panels = ⌊(roof area × utilization) ÷ panel area⌋ · kWp = panels × panel power ÷ 1000

    Utilization leaves room for walkways, shading and mounting geometry.

  3. 3

    Location-specific yield

    Annual yield per kWp from PVGIS, at optimal tilt and azimuth, with your system loss

    PVGIS returns monthly and annual production for a 1 kWp reference system at your coordinates.

  4. 4

    Recommended system size

    Panels = min(⌈demand ÷ yield ÷ panel kW⌉, max panels)

    The system is sized to your demand, then capped by what the roof can physically hold.

  5. 5

    Savings and payback

    Savings = min(production, consumption) × price · Payback = project cost ÷ first-year savings

    Savings use a simplified annual energy balance. Production beyond annual consumption is not credited; hourly self-consumption, export tariffs, and tiered electricity pricing are not modelled.

  6. 6

    25-year projection

    Production(year n) = production × (1 − degradation)^(n−1)

    Electricity prices are held constant in real terms; savings accumulate year over year.

  7. 7

    Environmental impact

    CO₂ avoided = production × grid emission factor · Trees = CO₂ ÷ 21 kg

    The tree equivalent is an illustrative comparison, not a certified offset.

Data sources