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 883 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: £721, Upfront: £10,173, Break-even: 14.1 yrs
| System | Annual output | Self-use | Exported | Bill saving | Export income | Annual benefit | Upfront cost | Break-even | 20-year net |
|---|---|---|---|---|---|---|---|---|---|
| 2 kW | 1766 kWh | 706 kWh | 1060 kWh | £183 | £106 | £289 | £4,069 | 14.1 yrs | £1,701 |
| 3 kW | 2649 kWh | 1060 kWh | 1589 kWh | £274 | £159 | £433 | £6,104 | 14.1 yrs | £2,552 |
| 4 kW | 3532 kWh | 1413 kWh | 2119 kWh | £365 | £212 | £577 | £8,138 | 14.1 yrs | £3,402 |
| 5 kW | 4415 kWh | 1766 kWh | 2649 kWh | £456 | £265 | £721 | £10,173 | 14.1 yrs | £4,253 |
| 6 kW | 5298 kWh | 2119 kWh | 3179 kWh | £548 | £318 | £866 | £12,207 | 14.1 yrs | £5,103 |
| 7 kW | 6181 kWh | 2472 kWh | 3709 kWh | £639 | £371 | £1,010 | £14,242 | 14.1 yrs | £5,954 |
| 8 kW | 7064 kWh | 2826 kWh | 4239 kWh | £730 | £424 | £1,154 | £16,276 | 14.1 yrs | £6,804 |
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: £861, 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 | 1766 kWh | 1060 kWh | 706 kWh | £274 | £71 | £344 | £6,169 | 17.9 yrs | £720 |
| 3 kW | 2649 kWh | 1589 kWh | 1060 kWh | £411 | £106 | £517 | £8,204 | 15.9 yrs | £2,130 |
| 4 kW | 3532 kWh | 2119 kWh | 1413 kWh | £548 | £141 | £689 | £10,238 | 14.9 yrs | £3,540 |
| 5 kW | 4415 kWh | 2649 kWh | 1766 kWh | £685 | £177 | £861 | £12,273 | 14.3 yrs | £4,950 |
| 6 kW | 5298 kWh | 3179 kWh | 2119 kWh | £821 | £212 | £1,033 | £14,307 | 13.8 yrs | £6,360 |
| 7 kW | 6181 kWh | 3709 kWh | 2472 kWh | £958 | £247 | £1,206 | £16,342 | 13.6 yrs | £7,770 |
| 8 kW | 7064 kWh | 4239 kWh | 2826 kWh | £1,095 | £283 | £1,378 | £18,376 | 13.3 yrs | £9,180 |
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: £931, Upfront: £13,673, Break-even: 14.7 yrs
| System | Annual output | Self-use | Exported | Bill saving | Export income | Annual benefit | Upfront cost | Break-even | 20-year net |
|---|---|---|---|---|---|---|---|---|---|
| 2 kW | 1766 kWh | 1236 kWh | 530 kWh | £319 | £53 | £372 | £7,569 | 20.3 yrs | £-120 |
| 3 kW | 2649 kWh | 1854 kWh | 795 kWh | £479 | £79 | £559 | £9,604 | 17.2 yrs | £1,569 |
| 4 kW | 3532 kWh | 2472 kWh | 1060 kWh | £639 | £106 | £745 | £11,638 | 15.6 yrs | £3,259 |
| 5 kW | 4415 kWh | 3091 kWh | 1325 kWh | £799 | £132 | £931 | £13,673 | 14.7 yrs | £4,949 |
| 6 kW | 5298 kWh | 3709 kWh | 1589 kWh | £958 | £159 | £1,117 | £15,707 | 14.1 yrs | £6,639 |
| 7 kW | 6181 kWh | 4327 kWh | 1854 kWh | £1,118 | £185 | £1,303 | £17,742 | 13.6 yrs | £8,328 |
| 8 kW | 7064 kWh | 4945 kWh | 2119 kWh | £1,278 | £212 | £1,490 | £19,776 | 13.3 yrs | £10,018 |
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: £952, Upfront: £15,423, Break-even: 16.2 yrs
| System | Annual output | Self-use | Exported | Bill saving | Export income | Annual benefit | Upfront cost | Break-even | 20-year net |
|---|---|---|---|---|---|---|---|---|---|
| 2 kW | 1766 kWh | 1289 kWh | 477 kWh | £333 | £48 | £381 | £9,319 | 24.5 yrs | £-1,703 |
| 3 kW | 2649 kWh | 1934 kWh | 715 kWh | £500 | £72 | £571 | £11,354 | 19.9 yrs | £71 |
| 4 kW | 3532 kWh | 2578 kWh | 954 kWh | £666 | £95 | £762 | £13,388 | 17.6 yrs | £1,845 |
| 5 kW | 4415 kWh | 3223 kWh | 1192 kWh | £833 | £119 | £952 | £15,423 | 16.2 yrs | £3,618 |
| 6 kW | 5298 kWh | 3868 kWh | 1431 kWh | £999 | £143 | £1,142 | £17,457 | 15.3 yrs | £5,392 |
| 7 kW | 6181 kWh | 4512 kWh | 1669 kWh | £1,166 | £167 | £1,333 | £19,492 | 14.6 yrs | £7,166 |
| 8 kW | 7064 kWh | 5157 kWh | 1907 kWh | £1,333 | £191 | £1,523 | £21,526 | 14.1 yrs | £8,939 |
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: £966, Upfront: £17,173, Break-even: 17.8 yrs
| System | Annual output | Self-use | Exported | Bill saving | Export income | Annual benefit | Upfront cost | Break-even | 20-year net |
|---|---|---|---|---|---|---|---|---|---|
| 2 kW | 1766 kWh | 1325 kWh | 442 kWh | £342 | £44 | £386 | £11,069 | 28.6 yrs | £-3,341 |
| 3 kW | 2649 kWh | 1987 kWh | 662 kWh | £513 | £66 | £580 | £13,104 | 22.6 yrs | £-1,511 |
| 4 kW | 3532 kWh | 2649 kWh | 883 kWh | £685 | £88 | £773 | £15,138 | 19.6 yrs | £319 |
| 5 kW | 4415 kWh | 3311 kWh | 1104 kWh | £856 | £110 | £966 | £17,173 | 17.8 yrs | £2,148 |
| 6 kW | 5298 kWh | 3974 kWh | 1325 kWh | £1,027 | £132 | £1,159 | £19,207 | 16.6 yrs | £3,978 |
| 7 kW | 6181 kWh | 4636 kWh | 1545 kWh | £1,198 | £155 | £1,352 | £21,242 | 15.7 yrs | £5,807 |
| 8 kW | 7064 kWh | 5298 kWh | 1766 kWh | £1,369 | £177 | £1,546 | £23,276 | 15.1 yrs | £7,637 |
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: £980, Upfront: £19,623, Break-even: 20.0 yrs
| System | Annual output | Self-use | Exported | Bill saving | Export income | Annual benefit | Upfront cost | Break-even | 20-year net |
|---|---|---|---|---|---|---|---|---|---|
| 2 kW | 1766 kWh | 1360 kWh | 406 kWh | £351 | £41 | £392 | £13,519 | 34.5 yrs | £-5,679 |
| 3 kW | 2649 kWh | 2040 kWh | 609 kWh | £527 | £61 | £588 | £15,554 | 26.5 yrs | £-3,793 |
| 4 kW | 3532 kWh | 2720 kWh | 812 kWh | £703 | £81 | £784 | £17,588 | 22.4 yrs | £-1,908 |
| 5 kW | 4415 kWh | 3400 kWh | 1015 kWh | £878 | £102 | £980 | £19,623 | 20.0 yrs | £-22 |
| 6 kW | 5298 kWh | 4080 kWh | 1219 kWh | £1,054 | £122 | £1,176 | £21,657 | 18.4 yrs | £1,863 |
| 7 kW | 6181 kWh | 4760 kWh | 1422 kWh | £1,230 | £142 | £1,372 | £23,692 | 17.3 yrs | £3,749 |
| 8 kW | 7064 kWh | 5439 kWh | 1625 kWh | £1,406 | £162 | £1,568 | £25,726 | 16.4 yrs | £5,635 |
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.