Rules of Thumb ›
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Solar PV
Results are for reference only. These are estimates from climate averages, not a site survey — get a professional assessment before buying or sizing a real system.
System size it up
Location
Specify system by
Rated power (kWp)
Panel area (m²)
Orientation (which way it faces)
Equator
SE/SW
E/W
Pole
Monthly generation
drag a bar to read its month · —
Economics
Does it pay for itself?
rough estimate — assumes you use or bank every kWh at the price above
Relationships
What drives the yield
cyan markers track your current system
Field notes
How a yield estimate is built
Solar PV Estimator — annual and monthly output from the standard relation
E = A · η · H · PR, where H is the in-plane solar irradiation. Location irradiance comes from baked-in
long-run climate averages , and the monthly distribution and tilt/orientation gains are modelled from solar
geometry — not live weather, satellite, or shading data. Real output depends on local microclimate, horizon and
roof shading, soiling, temperature, inverter behaviour, and year-to-year weather, none of which are captured
here. Treat these figures as a ballpark for comparison and intuition, not a substitute for a professional
site survey and quote. Runs entirely on your device.