When to use this calculator
Value solar used on site at the import spending it avoids, rather than applying the export rate to all generation.
Explore the solar generation & value calculators for other questions in this topic. For a related calculation, use the Solar Battery Charging Hours Calculator: Estimate equivalent constant-power solar hours to replace a battery-energy amount.
PUTTING IT INTO PRACTICE
Solar Annual Value: a worked example
The values below are an illustrative example, not a recommendation. Replace them with measurements or assumptions that match your question.
| Input | Example value |
|---|---|
| Energy used on site (kWh) | 1,800 |
| Avoided import price per kWh | 0.3 |
| Exported energy (kWh) | 1,200 |
| Export rate per kWh | 0.08 |
| Result | 636 per year |
- Check the input labels and enter the example values above.
- Apply the relationship: Annual value = on-site use × avoided import rate + exports × export rate.
- The result is 636 per year, rounded for display.
How to interpret your result
Excludes fixed charges, maintenance, finance, degradation and time-varying tariffs.
Peak sun hours describe equivalent full-power sunlight, not total daylight. Self-consumption and self-sufficiency have different denominators. On-site use and exports may have different monetary values.
Frequently asked questions
Are self-consumption and self-sufficiency the same percentage?
No. Self-consumption divides solar used on site by solar generated; self-sufficiency divides solar supplying demand by total site demand.
When is the solar annual value calculator useful?
Value solar used on site at the import spending it avoids, rather than applying the export rate to all generation.
How do I use the solar annual value calculator?
Enter energy used on site (kwh), avoided import price per kwh, exported energy (kwh), export rate per kwh. The result updates automatically. Use the units shown beside each input; the example values illustrate the method.
Which formula does this calculator use?
Annual value = on-site use × avoided import rate + exports × export rate.
What should I check before using the result?
Excludes fixed charges, maintenance, finance, degradation and time-varying tariffs.
How are results rounded?
Scalar numbers display up to six decimal places, with scientific notation for very large or small values. Text, fraction, date and schedule outputs use the format described on the tool. Intermediate calculations use JavaScript floating-point arithmetic. Keep sensible precision for your measurements.
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