Calculate your annual electricity bill savings and projected 25-year ROI.
| Monthly Bill Bracket | System Array | Typical Base Cost | Offset (With Battery) |
|---|---|---|---|
| Up to £150 / mo | 3.5 kWp (~8-10 Panels) | ~£5,000 | ~70% (£1,260/yr) |
| £150 - £250 / mo | 5.0 kWp (~12-14 Panels) | ~£6,500 | ~70% (£1,680/yr) |
| £250+ / mo | 7.5 kWp (~18-20 Panels) | ~£8,500 | ~70% (£2,100+/yr) |
Stand-alone solar arrays offset ~45% of annual usage by direct daytime consumption. Combining an array with 5kWh or 10kWh battery storage (+£2,800) raises self-consumption to ~70% across evening hours.