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Postcode solar briefing

Solar panel cost in St. Helens (WA11)

See realistic solar installation costs, savings and payback for WA11 (St. Helens) using official UK data. Start with the local verdict, then adjust the calculator for your roof, usage and export assumptions.

Local model Calculator unchanged Quote assumptions checked
Local solar briefing

Solar in WA11: worth checking with local numbers before trusting a generic quote.

This is a modelled local view, not a promise of savings. Use it as a quick sense-check before comparing installer quotes for WA11.

Typical system
4.0 kW
starting point
Annual benefit
£620
before battery costs
Payback estimate
11.8 years
panel-only baseline
Postcode verdict
Roof direction matters
local model
Local context

Why WA11 differs

South-facing yield is about 2.4% below the North Wales and Mersey median.

The starting system size is 4.0 kW, which is smaller than the regional typical size of 5.0 kW.

Local housing mix looks suitable for a postcode-level estimate, but your actual roof still matters more than the area average.

Battery payback depends heavily on evening use, export tariff and whether the installer has assumed optimistic self-consumption.

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
11.8 years
After this, it's pure profit
Upfront Cost
£7,307
What you pay to get started
Annual Benefit
£620
What you save every year
Profit Over 25 Years
£8,186
After paying itself off, you're this much ahead

Ready to Get Started?

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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: The official cost per kW is lower above 4 kW, so a 5–6 kW system can pay back a little faster than a 3–4 kW system on otherwise identical assumptions.
  • 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

Panel costs: Uses March 2026 TIC mean installation costs: £1,827/kW up to 4 kW and £1,628/kW above 4 kW.

Other costs: Battery prices are modelled at £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.

Before you sign

What to challenge in solar quotes for WA11

Use the calculator above as a baseline, then ask installers to explain where their quote differs from the local assumptions.

If the proposed system is much larger than 4.0 kW, ask why it fits your roof and usage.

Compare payback with and without a battery before accepting a bundled quote.

Check which Smart Export Guarantee tariff is assumed. The calculator baseline uses 10p/kWh.

Confirm who handles MCS certification and DNO/G98/G99 paperwork before comparing finance or warranties.

Compare quotes Check MCS DNO, G98 and G99
New quote check

Want a quote sanity check for WA11?

Share the first part of your postcode and a few basics. We’ll help you check whether system size, battery, export and paperwork assumptions look sensible before you commit to installer conversations.

This is a practical sanity-check request, not an instant quote promise. The Blue Ape quote route above remains available if you already want installer introductions.

Request a quote sanity check →

Insights for WA11

Figures below are tailored to WA11 — click through for full league tables.

Big-Roof Britain Rank #1540 of 2182
4.7 kWp (UK avg 5.1 kWp)
~10 panels (≈430 W)
Solar Payback Index Rank #2421 of 2996
11.8 years (UK avg 10.8 years)
~£620 /yr • £7,307 upfront
Standing-Charge Drag Rank #2939 of 2996
41.6% (UK avg 26.6%) drag on savings
£258 fixed • ~£620 /yr value
Aspect Penalty View ranking →
East −19.7% West −20.3%
Typical output loss versus a south-facing roof (lower is better)
Compare areas

Compare WA11 with nearby and similar areas

Nearby postcode areas in North Wales and Mersey

WA10 (St. Helens)
≈2.8 km away
Local sunshine: ~911 kWh/kWp · +0% vs WA11
WA9 (St. Helens)
≈4.0 km away
Local sunshine: ~911 kWh/kWp · +0% vs WA11
L34 (Knowsley)
≈7.3 km away
Local sunshine: ~922 kWh/kWp · +2% vs WA11
L35 (Knowsley)
≈7.6 km away
Local sunshine: ~914 kWh/kWp · +1% vs WA11
WA5 (Warrington)
≈10.1 km away
Local sunshine: ~907 kWh/kWp · -0% vs WA11
L36 (Knowsley)
≈10.4 km away
Local sunshine: ~919 kWh/kWp · +1% vs WA11

Similar solar-yield areas

TS7 (Middlesbrough)
~908 kWh/kWp · +0% vs WA11
BD7 (Bradford)
~908 kWh/kWp · -0% vs WA11
BD6 (Bradford)
~908 kWh/kWp · -0% vs WA11

Your area in context

In North Wales and Mersey, the current unit rate is 27.66p/kWh with a 70.76p/day standing charge. Your postcode’s south-facing sunshine yield is 908 kWh/kW — 22 below the regional median (930).

Read the full story

A typical roof here lands around 4.0 kW, with most eligible homes comfortably fitting within 3–6 kW. Each kilowatt of panels produces roughly 908 kWh per year on a south-facing roof. We value self-used electricity at 27.7p and exported surplus at a baseline 10p via SEG. Use the calculator above for your exact tariff.

Unit rate
27.7p/kWh
Standing charge
70.8p/day
Sunshine yield (south)
908 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: £775, Upfront: £9,134, Break-even: 11.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1816 kWh 726 kWh 1090 kWh £201 £109 £310 £3,654 11.8 yrs £2,544
3 kW 2724 kWh 1090 kWh 1634 kWh £301 £163 £465 £5,481 11.8 yrs £3,816
4 kW 3632 kWh 1453 kWh 2179 kWh £402 £218 £620 £7,307 11.8 yrs £5,088
5 kW 4540 kWh 1816 kWh 2724 kWh £502 £272 £775 £9,134 11.8 yrs £6,359
6 kW 5448 kWh 2179 kWh 3269 kWh £603 £327 £930 £10,961 11.8 yrs £7,631
7 kW 6356 kWh 2542 kWh 3813 kWh £703 £381 £1,085 £12,788 11.8 yrs £8,903
8 kW 7264 kWh 2906 kWh 4358 kWh £804 £436 £1,239 £14,615 11.8 yrs £10,175

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,827, battery £/kWh = 700.

3 kWh battery 5 kW example → Annual benefit: £935, Upfront: £11,234, Break-even: 12.0 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1816 kWh 1090 kWh 726 kWh £301 £73 £374 £5,754 15.4 yrs £1,727
3 kW 2724 kWh 1634 kWh 1090 kWh £452 £109 £561 £7,581 13.5 yrs £3,640
4 kW 3632 kWh 2179 kWh 1453 kWh £603 £145 £748 £9,407 12.6 yrs £5,553
5 kW 4540 kWh 2724 kWh 1816 kWh £753 £182 £935 £11,234 12.0 yrs £7,466
6 kW 5448 kWh 3269 kWh 2179 kWh £904 £218 £1,122 £13,061 11.6 yrs £9,380
7 kW 6356 kWh 3813 kWh 2542 kWh £1,055 £254 £1,309 £14,888 11.4 yrs £11,293
8 kW 7264 kWh 4358 kWh 2906 kWh £1,205 £291 £1,496 £16,715 11.2 yrs £13,206

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,827, battery £/kWh = 700.

5 kWh battery 5 kW example → Annual benefit: £1,015, Upfront: £12,634, Break-even: 12.4 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1816 kWh 1271 kWh 545 kWh £352 £54 £406 £7,154 17.6 yrs £968
3 kW 2724 kWh 1907 kWh 817 kWh £527 £82 £609 £8,981 14.7 yrs £3,202
4 kW 3632 kWh 2542 kWh 1090 kWh £703 £109 £812 £10,807 13.3 yrs £5,436
5 kW 4540 kWh 3178 kWh 1362 kWh £879 £136 £1,015 £12,634 12.4 yrs £7,670
6 kW 5448 kWh 3813 kWh 1634 kWh £1,055 £163 £1,218 £14,461 11.9 yrs £9,904
7 kW 6356 kWh 4449 kWh 1907 kWh £1,231 £191 £1,421 £16,288 11.5 yrs £12,138
8 kW 7264 kWh 5085 kWh 2179 kWh £1,406 £218 £1,624 £18,115 11.2 yrs £14,372

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,827, battery £/kWh = 700.

7.5 kWh battery 5 kW example → Annual benefit: £1,039, Upfront: £14,384, 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 1816 kWh 1326 kWh 490 kWh £367 £49 £416 £8,904 21.4 yrs £-590
3 kW 2724 kWh 1988 kWh 735 kWh £550 £74 £624 £10,731 17.2 yrs £1,741
4 kW 3632 kWh 2651 kWh 981 kWh £733 £98 £831 £12,557 15.1 yrs £4,071
5 kW 4540 kWh 3314 kWh 1226 kWh £917 £123 £1,039 £14,384 13.8 yrs £6,401
6 kW 5448 kWh 3977 kWh 1471 kWh £1,100 £147 £1,247 £16,211 13.0 yrs £8,731
7 kW 6356 kWh 4640 kWh 1716 kWh £1,283 £172 £1,455 £18,038 12.4 yrs £11,061
8 kW 7264 kWh 5303 kWh 1961 kWh £1,467 £196 £1,663 £19,865 11.9 yrs £13,391

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,827, battery £/kWh = 700.

10 kWh battery 5 kW example → Annual benefit: £1,055, Upfront: £16,134, Break-even: 15.3 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1816 kWh 1362 kWh 454 kWh £377 £45 £422 £10,654 25.2 yrs £-2,211
3 kW 2724 kWh 2043 kWh 681 kWh £565 £68 £633 £12,481 19.7 yrs £183
4 kW 3632 kWh 2724 kWh 908 kWh £753 £91 £844 £14,307 16.9 yrs £2,577
5 kW 4540 kWh 3405 kWh 1135 kWh £942 £113 £1,055 £16,134 15.3 yrs £4,972
6 kW 5448 kWh 4086 kWh 1362 kWh £1,130 £136 £1,266 £17,961 14.2 yrs £7,366
7 kW 6356 kWh 4767 kWh 1589 kWh £1,319 £159 £1,477 £19,788 13.4 yrs £9,760
8 kW 7264 kWh 5448 kWh 1816 kWh £1,507 £182 £1,688 £21,615 12.8 yrs £12,155

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,827, battery £/kWh = 700.

13.5 kWh battery 5 kW example → Annual benefit: £1,071, Upfront: £18,584, Break-even: 17.3 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1816 kWh 1398 kWh 418 kWh £387 £42 £429 £13,104 30.6 yrs £-4,533
3 kW 2724 kWh 2097 kWh 626 kWh £580 £63 £643 £14,931 23.2 yrs £-2,075
4 kW 3632 kWh 2797 kWh 835 kWh £774 £84 £857 £16,757 19.6 yrs £384
5 kW 4540 kWh 3496 kWh 1044 kWh £967 £104 £1,071 £18,584 17.3 yrs £2,842
6 kW 5448 kWh 4195 kWh 1253 kWh £1,160 £125 £1,286 £20,411 15.9 yrs £5,301
7 kW 6356 kWh 4894 kWh 1462 kWh £1,354 £146 £1,500 £22,238 14.8 yrs £7,759
8 kW 7264 kWh 5593 kWh 1671 kWh £1,547 £167 £1,714 £24,065 14.0 yrs £10,218

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,827, 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.

Seasonal solar output in WA11

Monthly generation per kilowatt of solar panels

kWh 30 Jan 48 Feb 80 Mar 106 Apr 117 May 112 Jun 112 Jul 101 Aug 83 Sep 56 Oct 37 Nov 27 Dec
Best month Worst month Winter (Dec–Feb) Other months

Winter output: 46.0% of an average month (Dec–Feb)

Best / worst month: May / Dec

These figures show output per kilowatt (kW) of panels installed. In winter, a 1 kW system here produces about 35 kWh per month; the average month produces around 76 kWh. So a typical 4 kW home system would generate roughly 139 kWh in winter, or 303 kWh in an average month.

Your Area at a Glance

Your Electricity Rate
27.66p/kWh
Daily Fixed Charge
70.76p/day
Local Sunshine
908kWh/kW
A 1 kW system generates ~908 kWh per year. A typical home uses ~2,700 kWh per year.
Typical System Size
4.0kW
For houses & bungalows in this area

Local Property Data

Property Types

Houses: 76% • Flats: 12% • Bungalows: 12% Based on 10,152 properties

Coverage

St. Helens (100%)

Areas Covered

Haydock, Rainford, Moss Bank, Blackbrook, St Helens Town Centre, Windle, Rural South, Billinge & Seneley Green + 2 more

Data Sources & Assumptions

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

Electricity rates: Ofgem price cap, Q3 2026

Installation costs: DESNZ/MCS data, March 2026 (TIC)

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.