Off Grid System Size Calculator
Size an off grid solar system from daily use, sun hours and autonomy.
Compare Your Options And Get Clear Answers
Size an off grid solar system from daily use, sun hours and autonomy.
Off Grid System Size 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.
Off Quick Guide
Typical values for reference.
| Daily use (kWh) | Peak sun hours | Days of battery autonomy | Solar array size |
|---|---|---|---|
| 8 | 3.5 | 2 | 3.05 kW solar |
| 4 | 3.5 | 2 | 1.52 kW solar |
| 15 | 3.5 | 3 | 5.71 kW solar |
| 8 | 2.5 | 2 | 4.27 kW solar |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Off Grid System 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.
Winter sun hours are the limiting case.
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.