Formula
- Use the units shown beside each field.
- Results update automatically whenever you change an input.
- Displayed values use up to four decimal places, or scientific notation for very small or large numbers. Calculations use standard floating-point arithmetic; exact integer and fraction tools identify their own precision rules.
- User-supplied yield and prices; simple undiscounted payback excludes financing, tax, degradation and major replacements.
Example Calculation
- Rated capacity: 10 kW
- Assumed capacity factor: 25 %
- Value per generated kWh: 0.15 currency/kWh
- Annual operating cost: 500 currency
- Initial investment: 20000 currency
10 kW at 25% capacity factor generates 21,900 kWh; value 0.15/kWh less 500 annual cost leaves 2785.
Frequently asked questions
How do I use this calculator?
Enter rated capacity, assumed capacity factor, value per generated kwh, annual operating cost, initial investment. The result updates automatically. Use Reset to restore the example values.
What method does it use?
annual kWh=rating ×8760 ×capacity factor; cash margin=energy ×value−operating cost.. User-supplied yield and prices; simple undiscounted payback excludes financing, tax, degradation and major replacements.
Why might a rounded result differ?
The calculation keeps full numeric precision internally, then rounds the displayed result. Rounding intermediate steps by hand can produce a slightly different answer.
Are my inputs saved online?
No. This calculator processes your inputs in your browser. A recently used list stores only calculator names on this device, not your entered values.
Check the assumptions and units before using this result. Read about calculation methods.