Estimated monthly generation
624 units
30-day planning estimateHow 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 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 ร peak-sun-hours ร system efficiency. Monthly generation uses 30 days.
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.
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.
Frequently asked questions
Is the solar panel output calculator free?๏ผ
Yes. SolvePilot tools are free, work in your browser, and require no account.
Does SolvePilot store my values?๏ผ
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?๏ผ
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?๏ผ
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?๏ผ
Cloud, heat, shade, dust, inverter clipping, orientation and seasonal sunlight change production.