Energy & home
Solar & PV Economics Calculator
Model PV generation, self-consumption, export, payback and the optional economic difference of storage.
PV system
Model PV generation, self-consumption, export, payback and the optional economic difference of storage.
Advanced assumptions
Result
Modelled payback
11.4 years
Until modelled payback
First-year energy flow
Economic breakdown
Cumulative cash-flow milestones
| Year | Cumulative cash flow |
|---|---|
| 1 | -12,776.40 € |
| 5 | -7,882.00 € |
| 10 | -1,764.00 € |
| 15 | 4,354.00 € |
| 20 | 10,472.00 € |
What if
| Assumption | Year-1 net benefit | Modelled payback | Modelled net result over the period | Modelled ROI over the period | |
|---|---|---|---|---|---|
| Baseline | 950.00 kWh/kWp | 1,223.60 € | 11.4 | 10,472.00 € | 74.8 % |
| Scenario A | 800.00 kWh/kWp | 1,030.40 € | 13.6 | 6,608.00 € | 47.2 % |
| Scenario B | 1,100.00 kWh/kWp | 1,416.80 € | 9.9 | 14,336.00 € | 102.4 % |
Model assumptions and limits
This is a deterministic economic model based on your inputs. Weather, shading, orientation, downtime, price and feed-in rules, degradation, maintenance, tax treatment, financing, grants and battery ageing can materially change actual results. It does not calculate roof design, support programmes, tariffs or taxes and is not investment advice.
The system model produces 7,600.00 kWh in year 1.
Of this, 2,280.00 kWh are modelled as directly self-consumed.
Modelled payback occurs after about 11.4 years.
Frequently asked questions
What is the difference between self-consumption and self-sufficiency?
Self-consumption is the share of PV generation used directly. Self-sufficiency is the share of household demand covered by that self-consumed PV energy.
How is payback calculated?
The model starts with net investment and adds annual net cash flows. It interpolates inside a year when cumulative cash flow crosses zero.
How is storage compared?
Storage uses a separately entered self-consumption share and added investments. Its payback uses only the incremental difference versus PV without storage.