What is PVGIS?
A free EU tool that estimates solar panel output for any location using satellite-based solar radiation data.
Quick Answer
PVGIS is the most reliable tool for estimating solar output in the UK. It uses satellite data specific to UK weather patterns. Most UK solar installers use PVGIS to validate their output estimates. You can access it free at re.jrc.ec.europa.eu/pvg_tools. For a 4kWp south-facing system in London, PVGIS estimates approximately 3,700 kWh/year.
Fact-checked by John Rooney, Solar Energy Editor. Editorial policy
PVGIS Explained
PVGIS (Photovoltaic Geographical Information System) is a free online tool developed by the European Commission's Joint Research Centre. It provides solar radiation data and PV energy output estimates for any location in Europe, Africa, and parts of Asia. Users can input their system size, panel type, tilt, orientation, and location to get hourly, monthly, or annual production estimates based on decades of satellite measurements.
How Does PVGIS Work in the UK?
PVGIS is the most reliable tool for estimating solar output in the UK. It uses satellite data specific to UK weather patterns. Most UK solar installers use PVGIS to validate their output estimates. You can access it free at re.jrc.ec.europa.eu/pvg_tools. For a 4kWp south-facing system in London, PVGIS estimates approximately 3,700 kWh/year.
Frequently Asked Questions
How accurate is PVGIS for the UK?
PVGIS is very accurate for the UK, typically within 5–10% of actual output. It uses over 10 years of satellite solar radiation data specific to each location.
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John Rooney is the founder of Solar Info and has been covering the UK solar energy market since 2023. He researches every battery and inverter brand against manufacturer datasheets, MCS and Ofgem data, and feedback from the MCS-certified installers in our directory before publishing.