Annual solar generation calculator
Enter your postcode and up to three arrays to see monthly and yearly generation for your exact location, worked out from long-term satellite solar data for that spot.
Where these numbers come from
Each array is worked out separately, using its own size, tilt, orientation and shading, then added together. The figures come from long-term satellite solar data for your exact location, the same source Wattlas uses for a connected system's own estimates.
Common questions
Where does the generation figure come from?
From long-term satellite solar data for your exact location, run for your panel size, tilt and orientation. It's worked out for where you live, so it isn't a national average.
Can I model more than one roof or array?
Yes - add up to three arrays, each with its own size, direction, pitch and shading, and the results break generation down by array as well as showing the combined total.
What does the System Power Loss setting mean?
A combined allowance for losses in cabling, inverter conversion, dirt and general wear. It starts at 14%, the standard figure. Newer, more efficient inverters can justify a lower one, so only change it if you know what you're adjusting.
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