A typical roof here lands around 6.0 kW, with most eligible homes comfortably fitting within 3–6 kW. Each kilowatt of panels produces roughly 878 kWh per year on a south-facing roof. We value self-used electricity at 25.8p and exported surplus at a baseline 10p via SEG. Use the calculator above for your exact tariff.
Browse the scenarios below. Each battery size has its own expand — open the one that matches your plan (or just explore). For each system size (2–8 kW) we show annual output, how much you use directly, what gets exported, annual benefit, upfront cost, break-even, and a 20-year net. Negative numbers are possible — that’s the honest trade-off when adding more battery than your usage profile justifies.
No battery 5 kW example → Annual benefit: £717, Upfront: £10,173, Break-even: 14.2 yrs
| System | Annual output | Self-use | Exported | Bill saving | Export income | Annual benefit | Upfront cost | Break-even | 20-year net |
|---|---|---|---|---|---|---|---|---|---|
| 2 kW | 1757 kWh | 703 kWh | 1054 kWh | £182 | £105 | £287 | £4,069 | 14.2 yrs | £1,670 |
| 3 kW | 2635 kWh | 1054 kWh | 1581 kWh | £272 | £158 | £430 | £6,104 | 14.2 yrs | £2,505 |
| 4 kW | 3513 kWh | 1405 kWh | 2108 kWh | £363 | £211 | £574 | £8,138 | 14.2 yrs | £3,340 |
| 5 kW | 4392 kWh | 1757 kWh | 2635 kWh | £454 | £263 | £717 | £10,173 | 14.2 yrs | £4,176 |
| 6 kW | 5270 kWh | 2108 kWh | 3162 kWh | £545 | £316 | £861 | £12,207 | 14.2 yrs | £5,011 |
| 7 kW | 6148 kWh | 2459 kWh | 3689 kWh | £635 | £369 | £1,004 | £14,242 | 14.2 yrs | £5,846 |
| 8 kW | 7026 kWh | 2811 kWh | 4216 kWh | £726 | £422 | £1,148 | £16,276 | 14.2 yrs | £6,681 |
Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 2,035, battery £/kWh = 700.
3 kWh battery 5 kW example → Annual benefit: £857, Upfront: £12,273, Break-even: 14.3 yrs
| System | Annual output | Self-use | Exported | Bill saving | Export income | Annual benefit | Upfront cost | Break-even | 20-year net |
|---|---|---|---|---|---|---|---|---|---|
| 2 kW | 1757 kWh | 1054 kWh | 703 kWh | £272 | £70 | £343 | £6,169 | 18.0 yrs | £683 |
| 3 kW | 2635 kWh | 1581 kWh | 1054 kWh | £409 | £105 | £514 | £8,204 | 16.0 yrs | £2,075 |
| 4 kW | 3513 kWh | 2108 kWh | 1405 kWh | £545 | £141 | £685 | £10,238 | 14.9 yrs | £3,466 |
| 5 kW | 4392 kWh | 2635 kWh | 1757 kWh | £681 | £176 | £857 | £12,273 | 14.3 yrs | £4,858 |
| 6 kW | 5270 kWh | 3162 kWh | 2108 kWh | £817 | £211 | £1,028 | £14,307 | 13.9 yrs | £6,250 |
| 7 kW | 6148 kWh | 3689 kWh | 2459 kWh | £953 | £246 | £1,199 | £16,342 | 13.6 yrs | £7,641 |
| 8 kW | 7026 kWh | 4216 kWh | 2811 kWh | £1,089 | £281 | £1,370 | £18,376 | 13.4 yrs | £9,033 |
Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 2,035, battery £/kWh = 700.
5 kWh battery 5 kW example → Annual benefit: £926, Upfront: £13,673, Break-even: 14.8 yrs
| System | Annual output | Self-use | Exported | Bill saving | Export income | Annual benefit | Upfront cost | Break-even | 20-year net |
|---|---|---|---|---|---|---|---|---|---|
| 2 kW | 1757 kWh | 1230 kWh | 527 kWh | £318 | £53 | £370 | £7,569 | 20.4 yrs | £-160 |
| 3 kW | 2635 kWh | 1844 kWh | 790 kWh | £477 | £79 | £556 | £9,604 | 17.3 yrs | £1,510 |
| 4 kW | 3513 kWh | 2459 kWh | 1054 kWh | £635 | £105 | £741 | £11,638 | 15.7 yrs | £3,179 |
| 5 kW | 4392 kWh | 3074 kWh | 1317 kWh | £794 | £132 | £926 | £13,673 | 14.8 yrs | £4,849 |
| 6 kW | 5270 kWh | 3689 kWh | 1581 kWh | £953 | £158 | £1,111 | £15,707 | 14.1 yrs | £6,519 |
| 7 kW | 6148 kWh | 4304 kWh | 1844 kWh | £1,112 | £184 | £1,297 | £17,742 | 13.7 yrs | £8,189 |
| 8 kW | 7026 kWh | 4919 kWh | 2108 kWh | £1,271 | £211 | £1,482 | £19,776 | 13.3 yrs | £9,859 |
Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 2,035, battery £/kWh = 700.
7.5 kWh battery 5 kW example → Annual benefit: £947, Upfront: £15,423, Break-even: 16.3 yrs
| System | Annual output | Self-use | Exported | Bill saving | Export income | Annual benefit | Upfront cost | Break-even | 20-year net |
|---|---|---|---|---|---|---|---|---|---|
| 2 kW | 1757 kWh | 1282 kWh | 474 kWh | £331 | £47 | £379 | £9,319 | 24.6 yrs | £-1,743 |
| 3 kW | 2635 kWh | 1923 kWh | 711 kWh | £497 | £71 | £568 | £11,354 | 20.0 yrs | £10 |
| 4 kW | 3513 kWh | 2565 kWh | 949 kWh | £663 | £95 | £758 | £13,388 | 17.7 yrs | £1,763 |
| 5 kW | 4392 kWh | 3206 kWh | 1186 kWh | £828 | £119 | £947 | £15,423 | 16.3 yrs | £3,517 |
| 6 kW | 5270 kWh | 3847 kWh | 1423 kWh | £994 | £142 | £1,136 | £17,457 | 15.4 yrs | £5,270 |
| 7 kW | 6148 kWh | 4488 kWh | 1660 kWh | £1,160 | £166 | £1,326 | £19,492 | 14.7 yrs | £7,023 |
| 8 kW | 7026 kWh | 5129 kWh | 1897 kWh | £1,325 | £190 | £1,515 | £21,526 | 14.2 yrs | £8,777 |
Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 2,035, battery £/kWh = 700.
10 kWh battery 5 kW example → Annual benefit: £961, Upfront: £17,173, Break-even: 17.9 yrs
| System | Annual output | Self-use | Exported | Bill saving | Export income | Annual benefit | Upfront cost | Break-even | 20-year net |
|---|---|---|---|---|---|---|---|---|---|
| 2 kW | 1757 kWh | 1317 kWh | 439 kWh | £340 | £44 | £384 | £11,069 | 28.8 yrs | £-3,382 |
| 3 kW | 2635 kWh | 1976 kWh | 659 kWh | £511 | £66 | £577 | £13,104 | 22.7 yrs | £-1,573 |
| 4 kW | 3513 kWh | 2635 kWh | 878 kWh | £681 | £88 | £769 | £15,138 | 19.7 yrs | £236 |
| 5 kW | 4392 kWh | 3294 kWh | 1098 kWh | £851 | £110 | £961 | £17,173 | 17.9 yrs | £2,045 |
| 6 kW | 5270 kWh | 3952 kWh | 1317 kWh | £1,021 | £132 | £1,153 | £19,207 | 16.7 yrs | £3,854 |
| 7 kW | 6148 kWh | 4611 kWh | 1537 kWh | £1,192 | £154 | £1,345 | £21,242 | 15.8 yrs | £5,663 |
| 8 kW | 7026 kWh | 5270 kWh | 1757 kWh | £1,362 | £176 | £1,537 | £23,276 | 15.1 yrs | £7,472 |
Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 2,035, battery £/kWh = 700.
13.5 kWh battery 5 kW example → Annual benefit: £975, Upfront: £19,623, Break-even: 20.1 yrs
| System | Annual output | Self-use | Exported | Bill saving | Export income | Annual benefit | Upfront cost | Break-even | 20-year net |
|---|---|---|---|---|---|---|---|---|---|
| 2 kW | 1757 kWh | 1353 kWh | 404 kWh | £350 | £40 | £390 | £13,519 | 34.7 yrs | £-5,721 |
| 3 kW | 2635 kWh | 2029 kWh | 606 kWh | £524 | £61 | £585 | £15,554 | 26.6 yrs | £-3,856 |
| 4 kW | 3513 kWh | 2705 kWh | 808 kWh | £699 | £81 | £780 | £17,588 | 22.6 yrs | £-1,992 |
| 5 kW | 4392 kWh | 3381 kWh | 1010 kWh | £874 | £101 | £975 | £19,623 | 20.1 yrs | £-127 |
| 6 kW | 5270 kWh | 4058 kWh | 1212 kWh | £1,049 | £121 | £1,170 | £21,657 | 18.5 yrs | £1,738 |
| 7 kW | 6148 kWh | 4734 kWh | 1414 kWh | £1,223 | £141 | £1,365 | £23,692 | 17.4 yrs | £3,602 |
| 8 kW | 7026 kWh | 5410 kWh | 1616 kWh | £1,398 | £162 | £1,560 | £25,726 | 16.5 yrs | £5,467 |
Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 2,035, battery £/kWh = 700.
Figures are illustrative and use the same method as the calculator above. For exact results, adjust your roof direction, tariff, and usage in the calculator.