LLLEILANY LABS
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SolarCalc.

Your roof. A brighter possibility.

Start with the energy you use.
See what the sun could help you build.

Make it yours

Example values to get started. Use your own bill and site assumptions.

kWh
50 kWh3,000 kWh

Your bill tells us how much energy solar needs to replace. Larger values can be entered directly.

%
h/day
W
Quick panel choices
What are peak sun hours?

Equivalent hours of full-strength sunlight per day, not daylight hours. Use a value appropriate to your location, season, and panel orientation; 5.2 is an example, not a local forecast.

Estimate from a locationUse a long-term annual solar average, then adjust it if needed.

Average daily horizontal solar irradiation, used here as a peak-sun-hours approximation. Country and city data from GeoNames via countries.dev; solar climatology by NASA POWER. This is not a roof-specific forecast.

Solar & roof assumptions80% performance · 30 days
%
days

Performance ratio combines system losses into one factor. This simplified estimate applies it once.

m²
%

The example uses 3 m² per panel plus 20% layout allowance. Replace these with module dimensions and a site-specific allowance; wattage alone does not determine panel size.

m²
YOUR SOLAR SYSTEM5.2 peak sun hours / day
Estimated installed capacity

6.88 kWp

Schematic rooftop. Not an installation layout.
11solar panels
625 Wper panel
6.49 kWpcalculated target

Whole panels, a little extra possibility. Installed capacity rounds your target up to complete modules.

Preliminary estimate, not a final engineering design. Weather, shading, orientation, equipment, and installation conditions affect real production.