LIVE PVGIS
Solar PV by Location
Load location-specific irradiation and PV yield, then size the array and estimate payback.
Calculate by location →Plan solar PV, solar roof, battery storage and solar water-heating projects from sizing and electrical scope through installed cost and payback.
Load location-specific irradiation and PV yield, then size the array and estimate payback.
Calculate by location →Analyze plane-of-array irradiation for any point on Earth, compare N/E/S/W, and find the best tested tilt and azimuth.
Open interactive irradiance explorer →PV modules, inverter, roof work, electrical upgrades, interconnection and complete installed scope.
Read PV cost guide →Compare solar shingles with conventional roof replacement plus separate rooftop PV.
Compare solar roof cost →Estimate system kW and panel count from electricity consumption and solar-resource assumptions.
Size a PV system →Estimate net project cost, first-year savings and simple payback.
Run payback calculator →Compare usable kWh, power, backup scope and installed price.
Read battery guide →Electrical integration, backup equipment, capacity and permitting.
Read installation guide →Battery quantity, backup architecture, electrical upgrades and site design.
Read guide →Collector, storage, plumbing, backup heating, solar fraction and simple savings.
Explore solar water heating →Turn climate concerns into a practical home-improvement plan: identify relevant hazards, review protective upgrades, estimate your own local costs and connect each action to existing WattCostLab tools.
Adaptation guides →Use these quote-based tools when you are preparing a project or comparing contractor scope.
Track tandem PV, module-efficiency records and scale-up.
Start with the pages readers are using most often for cost planning and comparisons.