Finance
Financial projections, scenario modelling, and sensitivity analysis
System Configs
9
Battery + inverter combos
Tariffs
9
UK energy tariffs
Scenarios
3
Best / Likely / Worst
Projection
10-20yr
Financial models
Sensitivity
7
Variable categories
Portfolio
10-100
Homes modelled
Total CAPEX
Payback Period
10yr IRR
10yr NPV (8%)
Annual Net Revenue — Typical home revenue — RS-25 / 64kWh / single-phase
Status
16–999 months (likely: 40)
Net Revenue Over Time
Annual net revenue across three scenarios
Cumulative Cash Flow
Running total of net revenue vs CAPEX
Gross Revenue
Total revenue before costs
Battery Capacity Remaining
Degradation impact over time
NPV at Various Discount Rates (20yr)
| Discount Rate | Best | Likely | Worst |
|---|---|---|---|
| 5% | £332,291 | £81,077 | -£41,826 |
| 8% | £242,848 | £57,127 | -£37,829 |
| 10% | £200,210 | £45,497 | -£35,852 |
| 12% | £167,001 | £36,306 | -£34,265 |
| 15% | £129,772 | £25,816 | -£32,421 |
Revenue reference notes
Revenue figures above are for the selected system configuration. Typical home revenue — RS-25 / 64kWh / single-phase: Agile Arbitrage £5,600, Saving Sessions £620, ENWL Flexibility (estimate) £310, SEG Export £380. Total: £7,670/yr (likely case).
The Beeches (proof of concept) — 192kWh 3-phase generates approximately 2× typical home revenue due to 3× battery capacity, a 96kW 3-phase inverter (vs 3.68kW single-phase limit), and a 50kW ENWL-approved export limit enabling multiple daily cycles.
Revenue varies by system size and phase. The Beeches is a 192kWh 3-phase installation. Typical single-phase homes generate approximately half this revenue.