Number of Solar Panels Needed Calculator
Estimate the number of solar panels needed to cover your yearly electricity use.
Compare Your Options And Get Clear Answers
Estimate the number of solar panels needed to cover your yearly electricity use.
Number of Solar Panels Needed Estimator
Enter your numbers below for an instant estimate.
How It Works
Key concepts behind this calculator
Enter Values
Fill in each field with your own numbers.
Calculate
Results update as you change the inputs.
Review
Read the breakdown and the explanation.
Adjust
Change values to compare scenarios.
Number Quick Guide
Typical values for reference.
| Annual use (kWh) | Panel size (W) | Yield (kWh per kWp per year) | Panels needed |
|---|---|---|---|
| 3500 | 400 | 900 | 10.0 panels |
| 2500 | 400 | 900 | 7.00 panels |
| 6000 | 400 | 900 | 17.0 panels |
| 3500 | 450 | 900 | 9.00 panels |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Number of Solar Calculator FAQ
Answers to common questions about this calculator.
It uses the formula shown with your inputs. Real conditions vary, so treat it as a guide.
Get a site survey.
It is an estimate based on the inputs you enter. Check real quotes, labels or official guidance for important decisions.
Yes. Replace each input with your own figures and the result updates instantly.