Monetize your watts
Your roof is a power plant. Treat it like one.
Eight ways to turn surplus kWh into income. Each watt is sold once — self-use first, then the next-best buyer takes what's left.
Monetize stack at a glance
- Total / yr (full stack)
- €3,212
- All 8 paths active
- Paths
- 8
- Pick any subset
- Payback range
- 2.8–12y
- Years to break even
- Core rule
- One kWh, sold once
- Never double-counted
Eight ways to monetize a watt
Self-use first, then by best € / kWh
- Risk: LowPayback: 4.2 yearsPer year: €612
Battery arbitrage
Charge cheap, discharge peak.
- Risk: MediumPayback: 2.8 yearsPer year: €720
BTC mining
Run a low-power ASIC on surplus.
- Risk: LowPayback: 6.1 yearsPer year: €240
Thermal storage
Surplus → hot-water tank.
- Risk: MediumPayback: 8.5 yearsPer year: €380
V2H / V2G
Discharge the EV during peak.
- Risk: LowPayback: 12.0 yearsPer year: €340
Feed-in tariff
Sell residual to the grid.
- Risk: MediumPayback: 5.8 yearsPer year: €280
EV peer charging
Sell to a neighbour's EV.
- Risk: HighPayback: 3.2 yearsPer year: €460
DePIN compute
Helium, Storj, Akash — earn tokens.
- Risk: LowPayback: 9.4 yearsPer year: €180
Community share
Share surplus with neighbours.
Want exact numbers for your roof? Open the calculator →
Where the power and the money go
Solar → inverter → buyer → € back
How it works
Step 1
Generate
Your solar array produces kWh during the day. Self-consumption takes priority — what you use at home is the most valuable kWh.
Step 2
Route surplus
What you don't use is routed by the inverter / energy manager to the next-best paying channel: battery arbitrage, mining, V2H, thermal, feed-in, etc.
Step 3
Earn € back
Each channel returns € to the household. Stacking 3 – 5 channels typically delivers 4–6× the income of feed-in-only.
Frequently asked
Does each kWh get sold twice across these channels?
No. Each kWh is routed to exactly one buyer in sequence — self-consumption first, then the next-best paying channel (battery arbitrage, BTC mining, V2H, thermal storage, feed-in, etc.). The rule is one kWh, sold once.
Is BTC mining surplus solar actually profitable in 2026?
Profitability depends on hashprice ($ per TH/day), local retail electricity rates, and how many surplus hours your system produces. At hashprice $55–$70 and a low-power ASIC (BitAxe, Apollo, Antminer S21 Hyd at low-watt mode), surplus-only mining typically returns €0.04–€0.09 per kWh — better than feed-in tariffs in most EU markets.
What is V2H and how does it pay back?
V2H (Vehicle-to-Home) discharges your EV battery during peak grid hours to power the house, then recharges off-peak or from solar surplus. Payback depends on your daily peak-spread (€/kWh peak minus off-peak). Currently practical with bidirectional Type-2 chargers and EVs that support DC bidirectional charging (Nissan Leaf, Ford F-150 Lightning, BYD Han, Polestar 3, etc.).
What is DePIN compute?
Decentralized Physical Infrastructure Networks — Helium, Storj, Akash, Filecoin, and similar — pay token rewards for contributing storage, bandwidth, or compute to a distributed network. Run them on a low-power mini-PC or storage device powered by solar surplus. Token volatility makes returns variable; treat as a higher-risk path.
Does the calculator account for panel degradation and electricity inflation?
Yes. The 25-year NPV chart applies 0.5% annual panel degradation and 3% annual electricity-price inflation, discounted at 5%. LFP batteries are modelled at 6,000 cycles to 80% State of Health. Adjust your assumptions via the sliders.