A typical roof here lands around 5.0 kW, with most eligible homes comfortably fitting within 3–6 kW. Each kilowatt of panels produces roughly 766 kWh per year on a south-facing roof. We value self-used electricity at 27.1p 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: £645, Upfront: £10,173, Break-even: 15.8 yrs
| System | Annual output | Self-use | Exported | Bill saving | Export income | Annual benefit | Upfront cost | Break-even | 20-year net |
|---|---|---|---|---|---|---|---|---|---|
| 2 kW | 1533 kWh | 613 kWh | 920 kWh | £166 | £92 | £258 | £4,069 | 15.8 yrs | £1,089 |
| 3 kW | 2299 kWh | 920 kWh | 1380 kWh | £249 | £138 | £387 | £6,104 | 15.8 yrs | £1,634 |
| 4 kW | 3066 kWh | 1226 kWh | 1840 kWh | £332 | £184 | £516 | £8,138 | 15.8 yrs | £2,178 |
| 5 kW | 3832 kWh | 1533 kWh | 2299 kWh | £415 | £230 | £645 | £10,173 | 15.8 yrs | £2,723 |
| 6 kW | 4599 kWh | 1840 kWh | 2759 kWh | £498 | £276 | £774 | £12,207 | 15.8 yrs | £3,267 |
| 7 kW | 5365 kWh | 2146 kWh | 3219 kWh | £581 | £322 | £903 | £14,242 | 15.8 yrs | £3,812 |
| 8 kW | 6132 kWh | 2453 kWh | 3679 kWh | £664 | £368 | £1,032 | £16,276 | 15.8 yrs | £4,356 |
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: £776, Upfront: £12,273, Break-even: 15.8 yrs
| System | Annual output | Self-use | Exported | Bill saving | Export income | Annual benefit | Upfront cost | Break-even | 20-year net |
|---|---|---|---|---|---|---|---|---|---|
| 2 kW | 1533 kWh | 920 kWh | 613 kWh | £249 | £61 | £310 | £6,169 | 19.9 yrs | £35 |
| 3 kW | 2299 kWh | 1380 kWh | 920 kWh | £373 | £92 | £465 | £8,204 | 17.6 yrs | £1,103 |
| 4 kW | 3066 kWh | 1840 kWh | 1226 kWh | £498 | £123 | £620 | £10,238 | 16.5 yrs | £2,170 |
| 5 kW | 3832 kWh | 2299 kWh | 1533 kWh | £622 | £153 | £776 | £12,273 | 15.8 yrs | £3,238 |
| 6 kW | 4599 kWh | 2759 kWh | 1840 kWh | £747 | £184 | £931 | £14,307 | 15.4 yrs | £4,305 |
| 7 kW | 5365 kWh | 3219 kWh | 2146 kWh | £871 | £215 | £1,086 | £16,342 | 15.1 yrs | £5,373 |
| 8 kW | 6132 kWh | 3679 kWh | 2453 kWh | £996 | £245 | £1,241 | £18,376 | 14.8 yrs | £6,440 |
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: £841, Upfront: £13,673, 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 | 1533 kWh | 1073 kWh | 460 kWh | £290 | £46 | £336 | £7,569 | 22.5 yrs | £-842 |
| 3 kW | 2299 kWh | 1610 kWh | 690 kWh | £436 | £69 | £505 | £9,604 | 19.0 yrs | £487 |
| 4 kW | 3066 kWh | 2146 kWh | 920 kWh | £581 | £92 | £673 | £11,638 | 17.3 yrs | £1,816 |
| 5 kW | 3832 kWh | 2683 kWh | 1150 kWh | £726 | £115 | £841 | £13,673 | 16.3 yrs | £3,145 |
| 6 kW | 4599 kWh | 3219 kWh | 1380 kWh | £871 | £138 | £1,009 | £15,707 | 15.6 yrs | £4,474 |
| 7 kW | 5365 kWh | 3756 kWh | 1610 kWh | £1,016 | £161 | £1,177 | £17,742 | 15.1 yrs | £5,803 |
| 8 kW | 6132 kWh | 4292 kWh | 1840 kWh | £1,161 | £184 | £1,345 | £19,776 | 14.7 yrs | £7,133 |
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: £861, Upfront: £15,423, 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 | 1533 kWh | 1119 kWh | 414 kWh | £303 | £41 | £344 | £9,319 | 27.1 yrs | £-2,435 |
| 3 kW | 2299 kWh | 1679 kWh | 621 kWh | £454 | £62 | £516 | £11,354 | 22.0 yrs | £-1,027 |
| 4 kW | 3066 kWh | 2238 kWh | 828 kWh | £606 | £83 | £688 | £13,388 | 19.4 yrs | £380 |
| 5 kW | 3832 kWh | 2798 kWh | 1035 kWh | £757 | £103 | £861 | £15,423 | 17.9 yrs | £1,788 |
| 6 kW | 4599 kWh | 3357 kWh | 1242 kWh | £908 | £124 | £1,033 | £17,457 | 16.9 yrs | £3,195 |
| 7 kW | 5365 kWh | 3917 kWh | 1449 kWh | £1,060 | £145 | £1,205 | £19,492 | 16.2 yrs | £4,603 |
| 8 kW | 6132 kWh | 4476 kWh | 1656 kWh | £1,211 | £166 | £1,377 | £21,526 | 15.6 yrs | £6,010 |
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: £874, Upfront: £17,173, Break-even: 19.7 yrs
| System | Annual output | Self-use | Exported | Bill saving | Export income | Annual benefit | Upfront cost | Break-even | 20-year net |
|---|---|---|---|---|---|---|---|---|---|
| 2 kW | 1533 kWh | 1150 kWh | 383 kWh | £311 | £38 | £349 | £11,069 | 31.7 yrs | £-4,080 |
| 3 kW | 2299 kWh | 1725 kWh | 575 kWh | £467 | £57 | £524 | £13,104 | 25.0 yrs | £-2,621 |
| 4 kW | 3066 kWh | 2299 kWh | 766 kWh | £622 | £77 | £699 | £15,138 | 21.7 yrs | £-1,161 |
| 5 kW | 3832 kWh | 2874 kWh | 958 kWh | £778 | £96 | £874 | £17,173 | 19.7 yrs | £299 |
| 6 kW | 4599 kWh | 3449 kWh | 1150 kWh | £933 | £115 | £1,048 | £19,207 | 18.3 yrs | £1,759 |
| 7 kW | 5365 kWh | 4024 kWh | 1341 kWh | £1,089 | £134 | £1,223 | £21,242 | 17.4 yrs | £3,219 |
| 8 kW | 6132 kWh | 4599 kWh | 1533 kWh | £1,244 | £153 | £1,398 | £23,276 | 16.7 yrs | £4,679 |
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: £887, Upfront: £19,623, Break-even: 22.1 yrs
| System | Annual output | Self-use | Exported | Bill saving | Export income | Annual benefit | Upfront cost | Break-even | 20-year net |
|---|---|---|---|---|---|---|---|---|---|
| 2 kW | 1533 kWh | 1180 kWh | 353 kWh | £319 | £35 | £355 | £13,519 | 38.1 yrs | £-6,426 |
| 3 kW | 2299 kWh | 1771 kWh | 529 kWh | £479 | £53 | £532 | £15,554 | 29.2 yrs | £-4,914 |
| 4 kW | 3066 kWh | 2361 kWh | 705 kWh | £639 | £71 | £709 | £17,588 | 24.8 yrs | £-3,401 |
| 5 kW | 3832 kWh | 2951 kWh | 881 kWh | £799 | £88 | £887 | £19,623 | 22.1 yrs | £-1,889 |
| 6 kW | 4599 kWh | 3541 kWh | 1058 kWh | £958 | £106 | £1,064 | £21,657 | 20.4 yrs | £-377 |
| 7 kW | 5365 kWh | 4131 kWh | 1234 kWh | £1,118 | £123 | £1,241 | £23,692 | 19.1 yrs | £1,135 |
| 8 kW | 6132 kWh | 4721 kWh | 1410 kWh | £1,278 | £141 | £1,419 | £25,726 | 18.1 yrs | £2,647 |
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.