Advanced Solar Flux Input Form
Example Data Table
| Input |
Example Value |
Purpose |
| Measured irradiance |
1361 W/m² |
Base solar flux before losses |
| Atmospheric transmittance |
72% |
Corrects sky clarity and air mass |
| Incidence angle |
25 degrees |
Adjusts beam strength on tilted panels |
| Panel efficiency |
21% |
Converts flux into DC power |
| System losses |
Soiling, shade, heat, wire |
Estimates practical field output |
Formula Used
Front flux = Solar input × Transmittance × cos(incidence angle).
Rear flux = Front flux × Albedo × Rear capture factor.
Gross flux = Front flux + Rear flux.
Effective flux = Gross flux × Soiling factor × Shading factor.
DC power = Effective flux × Total panel area × Panel efficiency × Temperature factor.
AC power = DC power × Wiring factor × Inverter efficiency.
Energy yield = AC power ÷ 1000 × Peak sun hours × Days.
How to Use This Calculator
Enter solar irradiance or keep the standard solar value.
Add local atmospheric transmittance and incidence angle.
Enter panel count, area, and module efficiency.
Add rear gain values when using bifacial modules.
Enter soiling, shading, temperature, wiring, and inverter losses.
Press Calculate to show output above the form.
Use CSV or PDF buttons to save your result.
Solar Flux Reborn Electrical Planning Guide
Solar flux describes incoming solar power on a surface. In electrical work, it helps estimate how much energy a panel field can receive before conversion losses. A simple value can mislead a designer. Real panels face angle loss, dust, shade, temperature rise, wire drop, and inverter loss. This calculator combines those factors into one practical workflow.
Why Corrected Flux Matters
The sun may deliver strong radiation above the atmosphere. Yet a roof array receives less. Air mass, clouds, humidity, and pollution reduce beam strength. Panel tilt also changes the effective beam. The cosine adjustment handles this angle effect. A panel facing the sun directly receives more useful flux than one mounted at a poor angle.
Electrical Output Estimate
After corrected flux is found, the tool multiplies it by panel area. It then applies module efficiency. This gives a DC power estimate. Temperature loss is applied because hot modules usually produce less power. Wiring and inverter settings convert the result into AC power. That value is easier to compare with loads, bills, and site demand.
Advanced Loss Inputs
Soiling and shading are separate inputs. This helps compare clean and dirty site conditions. Rear reflected gain is also included. It is useful for bifacial panels, light roofs, or reflective ground surfaces. The albedo and rear capture fields should be used with care. They can improve output, but only when site geometry supports reflection.
Using Results in Design
The daily and period energy estimates support early electrical planning. They are not a final guarantee. A full design should still review local weather files, equipment datasheets, mounting layout, conductor sizing, protection, and utility limits. Use the export buttons to keep a clear record of assumptions. This makes design checks easier during review.
FAQs
What is solar flux?
Solar flux is the solar power arriving on a surface area. It is usually shown in watts per square meter.
Can this calculator estimate panel output?
Yes. It estimates corrected flux, DC power, AC power, and energy yield using panel and loss inputs.
What does incidence angle mean?
It is the angle between sunlight and the panel normal. Smaller angles usually give higher useful flux.
Why include atmospheric transmittance?
Atmospheric transmittance adjusts solar input for sky clarity, air mass, humidity, and general atmospheric reduction.
What is rear reflected flux?
Rear reflected flux is extra light reaching the back of bifacial panels from ground or roof reflection.
Why does temperature reduce output?
Most solar modules lose voltage as temperature rises. This reduces practical DC power during hot operation.
Is this suitable for final design approval?
Use it for planning and comparison. Final approval should use local standards, datasheets, and professional review.
What do the export buttons save?
They save the calculated result table as a CSV file or a simple PDF report for records.