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)
Recalculated. Stack revenue: €1,151 per year. Uplift over feed-in only: 234%.
Inputs
Allocation + 25-year cashflow
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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.