Calculator
How much can your roof actually earn?
Drag the inputs to your reality. Numbers update live across the flow diagram, the per-channel ledger, and the 25-year cashflow.
Headline results
- Stack / yr
- €1,151
- From all paths
- Feed-in only / yr
- €344
- Baseline comparator
- Uplift
- 234%
- Stack vs feed-in only
- Payback
- 15.6y
- Years (simple)
Inputs
Allocation + 25-year cashflow
| Channel | kWh / yr | € / yr |
|---|---|---|
| Self-consumption | 1,680 | €534 |
| Battery arbitrage | 1,260 | €227 |
| BTC mining | 630 | €311 |
| Thermal storage | 252 | €48 |
| Feed-in tariff | 378 | €31 |
| Total | 4,200 | €1,151 |
- Self-consumption€534/yr
- Battery arbitrage€227/yr
- BTC mining€311/yr
- Thermal storage€48/yr
- Feed-in tariff€31/yr
- Monetize stack
- Feed-in only
- S&P 500 (7% CAGR)
- Break-even year 20
25-year NPV (5% discount):€3,313
| Year | Monetize stack | Feed-in only | S&P 500 (7% CAGR) |
|---|---|---|---|
| 0 | €-18,000 | €-18,000 | €0 |
| 1 | €-16,877 | €-17,664 | €1,260 |
| 2 | €-15,781 | €-17,336 | €2,608 |
| 3 | €-14,711 | €-17,016 | €4,051 |
| 4 | €-13,666 | €-16,703 | €5,594 |
| 5 | €-12,647 | €-16,398 | €7,246 |
| 6 | €-11,652 | €-16,100 | €9,013 |
| 7 | €-10,681 | €-15,809 | €10,904 |
| 8 | €-9,733 | €-15,526 | €12,927 |
| 9 | €-8,808 | €-15,249 | €15,092 |
| 10 | €-7,905 | €-14,979 | €17,409 |
| 11 | €-7,024 | €-14,715 | €19,887 |
| 12 | €-6,163 | €-14,457 | €22,539 |
| 13 | €-5,324 | €-14,206 | €25,377 |
| 14 | €-4,504 | €-13,961 | €28,414 |
| 15 | €-3,704 | €-13,721 | €31,663 |
| 16 | €-2,924 | €-13,488 | €35,139 |
| 17 | €-2,162 | €-13,260 | €38,859 |
| 18 | €-1,418 | €-13,037 | €42,839 |
| 19 | €-692 | €-12,820 | €47,097 |
| 20 | €17 | €-12,608 | €51,654 |
| 21 | €708 | €-12,401 | €56,530 |
| 22 | €1,383 | €-12,199 | €61,747 |
| 23 | €2,042 | €-12,001 | €67,330 |
| 24 | €2,685 | €-11,809 | €73,303 |
| 25 | €3,313 | €-11,621 | €79,694 |
Estimates use a 5% discount rate, 3% electricity inflation, 0.5% panel degradation per year, and LFP batteries at 6,000 cycles to 80% SoH. €18k baseline CapEx unless you change the slider. Channels rescale proportionally when surplus changes. Not investment advice.