Solar Output Calculator

Estimate the daily energy output of a solar panel array.

Calculate

Enter your values below.

Result

Estimated daily output
0

Formula used

Output (kWh/day) = (Panel watts × Number of panels ÷ 1000) × Sun hours × Efficiency

Example: 12 panels at 400W, 5 sun hours, 80% efficiency → output ≈ 19.2 kWh/day.

How to use this calculator

  1. Enter Panel wattage (W each), Number of panels, Peak sun hours per day, System efficiency (0-1).
  2. Press Calculate to see your result instantly.

FAQ

Frequently asked questions

Is this the same every day of the year?

No, output varies with season, weather, and available sunlight — this gives a typical estimate for the sun hours entered.

How does panel wattage affect output?

Higher-wattage panels produce proportionally more energy for the same sun exposure.

What efficiency factor should I use?

0.75-0.85 is typical for a well-installed system, accounting for inverter and wiring losses.

How do I use this to check my solar quote?

Compare the installer's promised output against this estimate using your local sun hours.