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Solar PV return Calculator
Estimate self-consumption benefit, export income and payback. This free solar pv return calculator shows the calculation and its assumptions so you can compare your own figures.
Your results
Estimate self-consumption benefit, export income and payback.
Calculated outcomes
- Generation KWh
- 4,500 kWh
- Self Consumed KWh
- 2,025 kWh
- Exported KWh
- 2,475 kWh
- Avoided Import Cost
- €607.50
- Export Income
- €371.25
Assumptions and estimates
- Method: Generation = kWp × specific yield. Benefit = self-use × import tariff + export × export tariff − maintenance.
- Yield and prices are editable estimates. Excludes tax treatment, finance, degradation, inverter replacement and grants unless already deducted from installed cost.
Useful next steps
- Check the payback period against how long you will keep the vehicle.
- Use Compare options to test an alternative side by side.
- Copy, print or download a record of this calculation when you need one.
Reports open your email app addressed to s@s1.ie with the public page address only. Your inputs are never added.
How the solar pv return calculation works
Generation = kWp × specific yield. Benefit = self-use × import tariff + export × export tariff − maintenance.
Yield and prices are editable estimates. Excludes tax treatment, finance, degradation, inverter replacement and grants unless already deducted from installed cost.
Using this calculator
- Enter your own figures in the labelled inputs. Keep the currencies, units and time periods consistent.
- Choose any applicable rate profile, pattern or assumption shown for this tool. Open additional inputs when relevant.
- Review annual net benefit and simple payback years, then read the stated assumptions and eligibility conditions before using the result.
Worked example
This is a static example using illustrative inputs, not facts about you or today’s date. The displayed eligibility selections and assumptions apply only to this example.
See example inputs
- PV system size (kWp)
- 5
- Annual generation per kWp (kWh)
- 900
- Self-consumed generation (%)
- 45
- Avoided import price (€/kWh)
- 0.3
- Export payment (€/kWh)
- 0.15
- Net installed cost (€)
- 8500
- Annual maintenance (€)
- 100
- Annual Net Benefit
- €878.75
- Simple Payback Years
- 9.67 years