Measure sunlight, shading, tilt, and panel readiness together. Review exposure, losses, and estimated usable output. Make sharper solar sizing choices with clearer site assumptions.
The page stays in a single main column, while calculator inputs shift to three, two, or one column based on screen size.
| Scenario | Peak Sun Hours | Area (m²) | Efficiency | Shade Loss | System Loss | Notes |
|---|---|---|---|---|---|---|
| South Roof, Clear Access | 6.2 | 22 | 21% | 4% | 9% | Good orientation and low blockage. |
| East Roof, Moderate Shade | 5.1 | 18 | 20% | 12% | 10% | Morning-heavy exposure profile. |
| Flat Roof, Adjustable Tilt | 5.8 | 30 | 22% | 3% | 8% | Better seasonal tuning possible. |
| Urban Roof, High Soiling Risk | 4.9 | 16 | 19% | 7% | 11% | Frequent cleaning improves output. |
1) Raw incident solar energy
Raw Incident Energy = Peak Sun Hours × (Irradiance / 1000) × Days × Panel Area
2) Alignment adjustment
After Alignment = Raw Incident Energy × Tilt Factor × Orientation Factor × Seasonal Factor
3) Environmental reduction
After Environmental Losses = After Alignment × (1 - Shading) × (1 - Dirt) × (1 - Temperature) × (1 - Horizon)
4) Gross electrical output
Gross DC Output = After Environmental Losses × Panel Efficiency
5) Final usable electricity
Net AC Output = Gross DC Output × (1 - System Loss)
6) Effective sun hours per day
Effective Sun Hours / Day = Peak Sun Hours × Irradiance Factor × All Exposure Factors
This method estimates practical solar exposure rather than ideal laboratory production. It helps compare rooftops, layouts, and loss assumptions using one consistent framework.
It means how much usable sunlight reaches your planned panel area after tilt, direction, seasonal change, shading, dirt, temperature, and system effects are considered.
Peak sun hours convert the day’s sunlight into an equivalent number of full-power hours. Daylight duration is longer, but not every hour delivers strong solar intensity.
Tilt factor estimates how close your panel angle is to an effective angle for collecting sunlight. A poor tilt can reduce usable solar gain even on bright days.
Orientation factor adjusts for panel direction. South-facing roofs may score higher in many northern hemisphere locations, while east or west roofs may produce lower totals.
Dust, pollen, bird residue, and heat can all reduce panel performance. These losses help move the estimate closer to realistic field output.
Yes. The net AC output gives a practical energy estimate that can support early battery sizing, self-consumption analysis, and backup duration planning.
Yes. Change the days field and seasonal factor to model a month, a season, or a custom period. This helps compare winter and summer exposure differences.
No. It is a strong planning tool, but a professional survey can add exact shade studies, local weather files, structural checks, and production modeling.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.