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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in M28 (Salford)

See if solar pays off for you in Salford — 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
13.7 years
After this, it's pure profit
Upfront Cost
£10,173
What you pay to get started
Annual Benefit
£742
What you save every year
Profit Over 25 Years
£8,373
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 881 kWh/kW — 11 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 881 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)
881 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: £742, Upfront: £10,173, Break-even: 13.7 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1762 kWh 705 kWh 1057 kWh £191 £106 £297 £4,069 13.7 yrs £1,866
3 kW 2642 kWh 1057 kWh 1585 kWh £287 £159 £445 £6,104 13.7 yrs £2,798
4 kW 3523 kWh 1409 kWh 2114 kWh £382 £211 £593 £8,138 13.7 yrs £3,731
5 kW 4404 kWh 1762 kWh 2642 kWh £478 £264 £742 £10,173 13.7 yrs £4,664
6 kW 5285 kWh 2114 kWh 3171 kWh £573 £317 £890 £12,207 13.7 yrs £5,597
7 kW 6166 kWh 2466 kWh 3699 kWh £669 £370 £1,039 £14,242 13.7 yrs £6,530
8 kW 7047 kWh 2819 kWh 4228 kWh £764 £423 £1,187 £16,276 13.7 yrs £7,463

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: £893, 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 1762 kWh 1057 kWh 705 kWh £287 £70 £357 £6,169 17.3 yrs £971
3 kW 2642 kWh 1585 kWh 1057 kWh £430 £106 £536 £8,204 15.3 yrs £2,507
4 kW 3523 kWh 2114 kWh 1409 kWh £573 £141 £714 £10,238 14.3 yrs £4,043
5 kW 4404 kWh 2642 kWh 1762 kWh £716 £176 £893 £12,273 13.8 yrs £5,578
6 kW 5285 kWh 3171 kWh 2114 kWh £860 £211 £1,071 £14,307 13.4 yrs £7,114
7 kW 6166 kWh 3699 kWh 2466 kWh £1,003 £247 £1,250 £16,342 13.1 yrs £8,650
8 kW 7047 kWh 4228 kWh 2819 kWh £1,146 £282 £1,428 £18,376 12.9 yrs £10,185

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: £968, Upfront: £13,673, 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 1762 kWh 1233 kWh 528 kWh £334 £53 £387 £7,569 19.6 yrs £174
3 kW 2642 kWh 1850 kWh 793 kWh £501 £79 £581 £9,604 16.5 yrs £2,011
4 kW 3523 kWh 2466 kWh 1057 kWh £669 £106 £774 £11,638 15.0 yrs £3,848
5 kW 4404 kWh 3083 kWh 1321 kWh £836 £132 £968 £13,673 14.1 yrs £5,685
6 kW 5285 kWh 3699 kWh 1585 kWh £1,003 £159 £1,161 £15,707 13.5 yrs £7,523
7 kW 6166 kWh 4316 kWh 1850 kWh £1,170 £185 £1,355 £17,742 13.1 yrs £9,360
8 kW 7047 kWh 4933 kWh 2114 kWh £1,337 £211 £1,549 £19,776 12.8 yrs £11,197

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: £991, Upfront: £15,423, Break-even: 15.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1762 kWh 1286 kWh 476 kWh £349 £48 £396 £9,319 23.5 yrs £-1,395
3 kW 2642 kWh 1929 kWh 713 kWh £523 £71 £594 £11,354 19.1 yrs £533
4 kW 3523 kWh 2572 kWh 951 kWh £697 £95 £792 £13,388 16.9 yrs £2,460
5 kW 4404 kWh 3215 kWh 1189 kWh £872 £119 £991 £15,423 15.6 yrs £4,388
6 kW 5285 kWh 3858 kWh 1427 kWh £1,046 £143 £1,189 £17,457 14.7 yrs £6,315
7 kW 6166 kWh 4501 kWh 1665 kWh £1,220 £166 £1,387 £19,492 14.1 yrs £8,243
8 kW 7047 kWh 5144 kWh 1903 kWh £1,395 £190 £1,585 £21,526 13.6 yrs £10,170

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: £1,006, Upfront: £17,173, Break-even: 17.1 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1762 kWh 1321 kWh 440 kWh £358 £44 £402 £11,069 27.5 yrs £-3,024
3 kW 2642 kWh 1982 kWh 661 kWh £537 £66 £603 £13,104 21.7 yrs £-1,037
4 kW 3523 kWh 2642 kWh 881 kWh £716 £88 £804 £15,138 18.8 yrs £951
5 kW 4404 kWh 3303 kWh 1101 kWh £895 £110 £1,006 £17,173 17.1 yrs £2,939
6 kW 5285 kWh 3964 kWh 1321 kWh £1,075 £132 £1,207 £19,207 15.9 yrs £4,927
7 kW 6166 kWh 4624 kWh 1541 kWh £1,254 £154 £1,408 £21,242 15.1 yrs £6,915
8 kW 7047 kWh 5285 kWh 1762 kWh £1,433 £176 £1,609 £23,276 14.5 yrs £8,902

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: £1,021, Upfront: £19,623, Break-even: 19.2 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1762 kWh 1356 kWh 405 kWh £368 £41 £408 £13,519 33.1 yrs £-5,354
3 kW 2642 kWh 2035 kWh 608 kWh £552 £61 £612 £15,554 25.4 yrs £-3,306
4 kW 3523 kWh 2713 kWh 810 kWh £735 £81 £817 £17,588 21.5 yrs £-1,258
5 kW 4404 kWh 3391 kWh 1013 kWh £919 £101 £1,021 £19,623 19.2 yrs £790
6 kW 5285 kWh 4069 kWh 1216 kWh £1,103 £122 £1,225 £21,657 17.7 yrs £2,839
7 kW 6166 kWh 4748 kWh 1418 kWh £1,287 £142 £1,429 £23,692 16.6 yrs £4,887
8 kW 7047 kWh 5426 kWh 1621 kWh £1,471 £162 £1,633 £25,726 15.8 yrs £6,935

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 M28

Figures below are tailored to M28 — click through for full league tables.

Big-Roof Britain Rank #1047 of 2182
5.0 kWp (UK avg 5.1 kWp)
~11 panels (≈430 W)
Solar Payback Index Rank #2221 of 2997
11.9 years (UK avg 11.3 years)
~£855 /yr • £10,173 upfront
Standing-Charge Drag Rank #1809 of 2997
21.8% (UK avg 21.7%) drag on savings
£187 fixed • ~£855 /yr value

Your Area at a Glance

Your Electricity Rate
27.11p/kWh
Daily Fixed Charge
51.16p/day
Local Sunshine
881kWh/kW
A 1 kW system generates ~881 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: 76% • Flats: 14% • Bungalows: 9% Based on 12,109 properties

Coverage

Salford (95%)|Wigan (5%)

Areas Covered

Boothstown & Ellenbrook, Walkden South, Walkden North, Swinton & Wardley, Little Hulton, Worsley & Westwood Park, Tyldesley & Mosley Common, Kearsley + 3 more

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

M38 (Salford)
≈2.2 km away
Local sunshine: ~880 kWh/kWp · -0% vs M28
BL4 (Bolton)
≈3.6 km away
Local sunshine: ~881 kWh/kWp · +0% vs M28
M27 (Salford)
≈4.0 km away
Local sunshine: ~868 kWh/kWp · -1% vs M28
M29 (Wigan)
≈4.3 km away
Local sunshine: ~885 kWh/kWp · +0% vs M28
BL78 (Bolton)
≈4.5 km away
Local sunshine: ~871 kWh/kWp · -1% vs M28
M30 (Salford)
≈4.5 km away
Local sunshine: ~875 kWh/kWp · -1% vs M28

Similar sunshine across the UK

NP24 (Caerphilly)
~881 kWh/kWp · -0% vs M28
EH22 (Midlothian)
~881 kWh/kWp · +0% vs M28
BT62 (Armagh City, Banbridge and Craigavon)
~880 kWh/kWp · -0% vs M28