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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in SK8 (Stockport)

See if solar pays off for you in Stockport — price, savings and payback in under a minute (official UK data).

Solar Calculator

Change the settings below to see how costs and savings work for your situation.

System Size

Roof Direction

Battery Storage

Export Value

Your Numbers

Break-even
13.8 years
After this, it's pure profit
Upfront Cost
£10,173
What you pay to get started
Annual Benefit
£737
What you save every year
Profit Over 25 Years
£8,258
After paying itself off, you're this much ahead

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How we calculate this

Solar generation: Based on typical south-facing roof at 35° angle. We account for weather, dirt, and system losses (14%).

How much you'll use directly:

  • Without battery: You'll use about 40% of what you generate. The rest gets sold back to the grid.
  • With 5 kWh battery: You'll use about 70% (battery stores extra for evening use).
  • With 10 kWh battery: You'll use about 75% (more storage means less exported).
  • Panel-only payback: Bigger systems don’t shorten payback—cost and savings rise together per kW.
  • Battery & payback: Batteries raise self-use and cut bills, but added hardware cost often lengthens break-even at typical UK rates.
  • When a battery can still make sense:
    • Evening-heavy usage patterns
    • Time-of-use tariffs / cheap night rates
    • Low export rate vs. high unit rate
    • Heat pump or EV charging synergy
    • Optional backup/resilience (system-dependent)
    • Lower evening-hour CO₂ vs. grid

Costs: Battery prices are typically £700 per kWh. Export tariffs vary by supplier (usually 5–15p per kWh).

Grid connection: Systems up to about 3.7 kW typically need just a notification (G98). Larger systems may need permission (G99).

These are typical values based on average usage patterns. Your actual results will vary based on your roof, shading, and how you use electricity.

Your area in context

In North West, the current unit rate is 27.11p/kWh with a 51.16p/day standing charge. Your postcode’s south-facing sunshine yield is 875 kWh/kW — 5 above the regional median (870).

Read the full story

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 875 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.

Unit rate
27.1p/kWh
Standing charge
51.2p/day
Sunshine yield (south)
875 kWh/kW
Export price (baseline)
10p/kWh

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: £737, Upfront: £10,173, Break-even: 13.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1751 kWh 700 kWh 1050 kWh £190 £105 £295 £4,069 13.8 yrs £1,829
3 kW 2626 kWh 1050 kWh 1576 kWh £285 £158 £442 £6,104 13.8 yrs £2,743
4 kW 3501 kWh 1401 kWh 2101 kWh £380 £210 £590 £8,138 13.8 yrs £3,657
5 kW 4377 kWh 1751 kWh 2626 kWh £475 £263 £737 £10,173 13.8 yrs £4,572
6 kW 5252 kWh 2101 kWh 3151 kWh £570 £315 £885 £12,207 13.8 yrs £5,486
7 kW 6127 kWh 2451 kWh 3676 kWh £664 £368 £1,032 £14,242 13.8 yrs £6,400
8 kW 7003 kWh 2801 kWh 4202 kWh £759 £420 £1,180 £16,276 13.8 yrs £7,314

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: £887, Upfront: £12,273, Break-even: 13.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1751 kWh 1050 kWh 700 kWh £285 £70 £355 £6,169 17.4 yrs £927
3 kW 2626 kWh 1576 kWh 1050 kWh £427 £105 £532 £8,204 15.4 yrs £2,440
4 kW 3501 kWh 2101 kWh 1401 kWh £570 £140 £710 £10,238 14.4 yrs £3,954
5 kW 4377 kWh 2626 kWh 1751 kWh £712 £175 £887 £12,273 13.8 yrs £5,467
6 kW 5252 kWh 3151 kWh 2101 kWh £854 £210 £1,064 £14,307 13.4 yrs £6,980
7 kW 6127 kWh 3676 kWh 2451 kWh £997 £245 £1,242 £16,342 13.2 yrs £8,494
8 kW 7003 kWh 4202 kWh 2801 kWh £1,139 £280 £1,419 £18,376 12.9 yrs £10,007

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: £962, Upfront: £13,673, 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 1751 kWh 1225 kWh 525 kWh £332 £53 £385 £7,569 19.7 yrs £126
3 kW 2626 kWh 1838 kWh 788 kWh £498 £79 £577 £9,604 16.6 yrs £1,939
4 kW 3501 kWh 2451 kWh 1050 kWh £664 £105 £769 £11,638 15.1 yrs £3,752
5 kW 4377 kWh 3064 kWh 1313 kWh £831 £131 £962 £13,673 14.2 yrs £5,565
6 kW 5252 kWh 3676 kWh 1576 kWh £997 £158 £1,154 £15,707 13.6 yrs £7,377
7 kW 6127 kWh 4289 kWh 1838 kWh £1,163 £184 £1,347 £17,742 13.2 yrs £9,190
8 kW 7003 kWh 4902 kWh 2101 kWh £1,329 £210 £1,539 £19,776 12.9 yrs £11,003

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: £984, Upfront: £15,423, Break-even: 15.7 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1751 kWh 1278 kWh 473 kWh £346 £47 £394 £9,319 23.7 yrs £-1,444
3 kW 2626 kWh 1917 kWh 709 kWh £520 £71 £591 £11,354 19.2 yrs £458
4 kW 3501 kWh 2556 kWh 945 kWh £693 £95 £787 £13,388 17.0 yrs £2,361
5 kW 4377 kWh 3195 kWh 1182 kWh £866 £118 £984 £15,423 15.7 yrs £4,264
6 kW 5252 kWh 3834 kWh 1418 kWh £1,039 £142 £1,181 £17,457 14.8 yrs £6,167
7 kW 6127 kWh 4473 kWh 1654 kWh £1,213 £165 £1,378 £19,492 14.1 yrs £8,069
8 kW 7003 kWh 5112 kWh 1891 kWh £1,386 £189 £1,575 £21,526 13.7 yrs £9,972

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: £999, Upfront: £17,173, Break-even: 17.2 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1751 kWh 1313 kWh 438 kWh £356 £44 £400 £11,069 27.7 yrs £-3,075
3 kW 2626 kWh 1969 kWh 656 kWh £534 £66 £600 £13,104 21.9 yrs £-1,112
4 kW 3501 kWh 2626 kWh 875 kWh £712 £88 £799 £15,138 18.9 yrs £851
5 kW 4377 kWh 3282 kWh 1094 kWh £890 £109 £999 £17,173 17.2 yrs £2,813
6 kW 5252 kWh 3939 kWh 1313 kWh £1,068 £131 £1,199 £19,207 16.0 yrs £4,776
7 kW 6127 kWh 4595 kWh 1532 kWh £1,246 £153 £1,399 £21,242 15.2 yrs £6,739
8 kW 7003 kWh 5252 kWh 1751 kWh £1,424 £175 £1,599 £23,276 14.6 yrs £8,701

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: £1,014, Upfront: £19,623, Break-even: 19.3 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1751 kWh 1348 kWh 403 kWh £365 £40 £406 £13,519 33.3 yrs £-5,405
3 kW 2626 kWh 2022 kWh 604 kWh £548 £60 £609 £15,554 25.6 yrs £-3,382
4 kW 3501 kWh 2696 kWh 805 kWh £731 £81 £811 £17,588 21.7 yrs £-1,360
5 kW 4377 kWh 3370 kWh 1007 kWh £914 £101 £1,014 £19,623 19.3 yrs £663
6 kW 5252 kWh 4044 kWh 1208 kWh £1,096 £121 £1,217 £21,657 17.8 yrs £2,686
7 kW 6127 kWh 4718 kWh 1409 kWh £1,279 £141 £1,420 £23,692 16.7 yrs £4,708
8 kW 7003 kWh 5392 kWh 1611 kWh £1,462 £161 £1,623 £25,726 15.9 yrs £6,731

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.

Insights for SK8

Figures below are tailored to SK8 — click through for full league tables.

Big-Roof Britain Rank #796 of 2182
5.3 kWp (UK avg 5.1 kWp)
~11 panels (≈430 W)
Solar Payback Index Rank #2352 of 2997
12.0 years (UK avg 11.3 years)
~£850 /yr • £10,173 upfront
Standing-Charge Drag Rank #1845 of 2997
22.0% (UK avg 21.7%) drag on savings
£187 fixed • ~£850 /yr value

Your Area at a Glance

Your Electricity Rate
27.11p/kWh
Daily Fixed Charge
51.16p/day
Local Sunshine
875kWh/kW
A 1 kW system generates ~875 kWh per year. A typical home uses ~2,700 kWh per year.
Typical System Size
5.0kW
For houses & bungalows in this area

Local Property Data

Property Types

Houses: 71% • Flats: 19% • Bungalows: 9% Based on 12,844 properties

Coverage

Stockport (100%)

Areas Covered

Cheadle West & Gatley, Cheadle Hulme South, Heald Green, Cheadle East & Cheadle Hulme North, Bramhall South & Woodford, Bramhall North, Handforth

Data Sources & Assumptions

Solar yield: PVGIS (EU Joint Research Centre), January 2025 data

Electricity rates: Ofgem price cap, Q4 2025

Installation costs: MCS certified installer data, March 2025

Property data: EPC open data (Open Government Licence), aggregated

All estimates are typical values. Actual results vary based on your specific situation, roof characteristics, and usage patterns.

Compare nearby areas

Nearby in North West

M22 (Manchester)
≈3.1 km away
Local sunshine: ~881 kWh/kWp · +1% vs SK8
SK3 (Stockport)
≈3.7 km away
Local sunshine: ~861 kWh/kWp · -2% vs SK8
SK7 (Stockport)
≈4.1 km away
Local sunshine: ~861 kWh/kWp · -2% vs SK8
SK4 (Stockport)
≈4.4 km away
Local sunshine: ~859 kWh/kWp · -2% vs SK8
M90 (Manchester)
≈4.6 km away
Local sunshine: ~881 kWh/kWp · +1% vs SK8
SK1 (Stockport)
≈4.7 km away
Local sunshine: ~861 kWh/kWp · -2% vs SK8

Similar sunshine across the UK

DG11 (Dumfries and Galloway)
~875 kWh/kWp · +0% vs SK8
HX7 (Calderdale)
~875 kWh/kWp · -0% vs SK8
TD8 (Scottish Borders)
~876 kWh/kWp · +0% vs SK8