Your result
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Enter your values, then click Calculate result.How this calculator helps
Translate installed solar capacity into a planning estimate of energy production. Peak-sun-hours and whole-system efficiency are editable so the result can reflect location, season, temperature, dust and conversion losses.
How to Size a Solar System in Pakistan
Calculate solar kW, panel count, inverter capacity and realistic generation from your own electricity use.
Read the complete guide →How to use it
- 1
Enter the array's total rated DC capacity in kilowatts.
- 2
Use representative peak-sun-hours for the location and season.
- 3
Set a whole-system efficiency that includes temperature, dust, wiring and inverter losses.
Formula and methodology
Daily generation = system kW × peak-sun-hours × system efficiency. Monthly generation uses 30 days.
Uses editable energy demand, sunlight, equipment and loss assumptions. It is a planning model rather than a site survey or electrical design.
Worked calculation example
A 5 kW system receiving 5.2 peak-sun-hours with 80% overall efficiency produces an estimated 20.8 units daily or 624 units in 30 days.
How to interpret your result
Use expected monthly units to compare installer proposals and identify claims that assume perfect conditions.
Input guide
Enter DC array capacity from panel nameplates.
Use representative peak-sun-hours for location and season.
Apply a system efficiency that includes temperature, wiring and inverter losses.
Scenario comparison
| Scenario | What it demonstrates |
|---|---|
| 5 kW × 5.2 sun-hours × 80% | about 20.8 kWh/day. |
| Same array in a weaker month | lower sun-hours reduce output directly. |
| Dust or partial shade | model with a lower efficiency assumption. |
Common mistakes to avoid
- Confusing panel capacity with daily energy.
- Using annual-average sunlight for every month.
- Ignoring clipping, shade, soiling and downtime.
Compare estimates with a location-specific yield report and monitored systems nearby.
What can affect the result?
Orientation and shade
Roof direction, tilt and partial shade change production throughout the day.
Weather and season
Cloud cover and winter sun reduce output relative to clear summer periods.
Equipment limits
Inverter clipping and grid interruptions can prevent available solar energy from being used.
Limits of this estimate
This daily-average model does not use hourly irradiance, roof geometry, shade mapping, panel degradation, clipping or grid-export restrictions.
Sources and review information
Frequently asked questions
Is the solar panel output calculator free?＋
Yes. SolvePilot tools are free, work in your browser, and require no account.
Does SolvePilot store my values?＋
No. Calculations run locally in your browser and the values you enter are not sent to a server.
Should I treat the result as an exact bill or quotation?＋
No. Results are informed estimates. Final charges can vary because of taxes, tariffs, lender terms, usage patterns, or provider rules.
How can I improve the accuracy?＋
Use recent values from your own bill, statement or institution, review every assumption, and confirm important results with the relevant official source.
Why do actual daily units change?＋
Cloud, heat, shade, dust, inverter clipping, orientation and seasonal sunlight change production.