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Solar panel cost in St. Helens (WA10)

See realistic solar installation costs, savings and payback for WA10 (St. Helens) in under a minute using official UK data. Start with the calculator, then get a no-obligation quote from an MCS-certified installer. You can also ask the SolarByPostcode assistant to sanity-check your roof, bills and plans.

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
£622
What you save every year
Profit Over 25 Years
£8,236
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: 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.

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 911 kWh/kW — 19 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 911 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)
911 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: £777, 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 1822 kWh 729 kWh 1093 kWh £202 £109 £311 £3,654 11.8 yrs £2,564
3 kW 2733 kWh 1093 kWh 1640 kWh £302 £164 £466 £5,481 11.8 yrs £3,846
4 kW 3644 kWh 1457 kWh 2186 kWh £403 £219 £622 £7,307 11.8 yrs £5,128
5 kW 4554 kWh 1822 kWh 2733 kWh £504 £273 £777 £9,134 11.8 yrs £6,409
6 kW 5465 kWh 2186 kWh 3279 kWh £605 £328 £933 £10,961 11.8 yrs £7,691
7 kW 6376 kWh 2551 kWh 3826 kWh £705 £383 £1,088 £12,788 11.8 yrs £8,973
8 kW 7287 kWh 2915 kWh 4372 kWh £806 £437 £1,243 £14,615 11.8 yrs £10,255

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: £938, 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 1822 kWh 1093 kWh 729 kWh £302 £73 £375 £5,754 15.3 yrs £1,751
3 kW 2733 kWh 1640 kWh 1093 kWh £454 £109 £563 £7,581 13.5 yrs £3,676
4 kW 3644 kWh 2186 kWh 1457 kWh £605 £146 £750 £9,407 12.5 yrs £5,601
5 kW 4554 kWh 2733 kWh 1822 kWh £756 £182 £938 £11,234 12.0 yrs £7,527
6 kW 5465 kWh 3279 kWh 2186 kWh £907 £219 £1,126 £13,061 11.6 yrs £9,452
7 kW 6376 kWh 3826 kWh 2551 kWh £1,058 £255 £1,313 £14,888 11.3 yrs £11,377
8 kW 7287 kWh 4372 kWh 2915 kWh £1,209 £291 £1,501 £16,715 11.1 yrs £13,303

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: £1,018, 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 1822 kWh 1275 kWh 547 kWh £353 £55 £407 £7,154 17.6 yrs £994
3 kW 2733 kWh 1913 kWh 820 kWh £529 £82 £611 £8,981 14.7 yrs £3,241
4 kW 3644 kWh 2551 kWh 1093 kWh £705 £109 £815 £10,807 13.3 yrs £5,488
5 kW 4554 kWh 3188 kWh 1366 kWh £882 £137 £1,018 £12,634 12.4 yrs £7,735
6 kW 5465 kWh 3826 kWh 1640 kWh £1,058 £164 £1,222 £14,461 11.8 yrs £9,982
7 kW 6376 kWh 4463 kWh 1913 kWh £1,235 £191 £1,426 £16,288 11.4 yrs £12,229
8 kW 7287 kWh 5101 kWh 2186 kWh £1,411 £219 £1,630 £18,115 11.1 yrs £14,477

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: £1,043, 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 1822 kWh 1330 kWh 492 kWh £368 £49 £417 £8,904 21.3 yrs £-563
3 kW 2733 kWh 1995 kWh 738 kWh £552 £74 £626 £10,731 17.2 yrs £1,781
4 kW 3644 kWh 2660 kWh 984 kWh £736 £98 £834 £12,557 15.1 yrs £4,124
5 kW 4554 kWh 3325 kWh 1230 kWh £920 £123 £1,043 £14,384 13.8 yrs £6,468
6 kW 5465 kWh 3990 kWh 1476 kWh £1,104 £148 £1,251 £16,211 13.0 yrs £8,812
7 kW 6376 kWh 4655 kWh 1722 kWh £1,287 £172 £1,460 £18,038 12.4 yrs £11,155
8 kW 7287 kWh 5320 kWh 1968 kWh £1,471 £197 £1,668 £19,865 11.9 yrs £13,499

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: £1,059, Upfront: £16,134, Break-even: 15.2 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1822 kWh 1366 kWh 455 kWh £378 £46 £423 £10,654 25.2 yrs £-2,184
3 kW 2733 kWh 2050 kWh 683 kWh £567 £68 £635 £12,481 19.6 yrs £224
4 kW 3644 kWh 2733 kWh 911 kWh £756 £91 £847 £14,307 16.9 yrs £2,632
5 kW 4554 kWh 3416 kWh 1139 kWh £945 £114 £1,059 £16,134 15.2 yrs £5,040
6 kW 5465 kWh 4099 kWh 1366 kWh £1,134 £137 £1,270 £17,961 14.1 yrs £7,448
7 kW 6376 kWh 4782 kWh 1594 kWh £1,323 £159 £1,482 £19,788 13.4 yrs £9,856
8 kW 7287 kWh 5465 kWh 1822 kWh £1,512 £182 £1,694 £21,615 12.8 yrs £12,263

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: £1,075, 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 1822 kWh 1403 kWh 419 kWh £388 £42 £430 £13,104 30.5 yrs £-4,505
3 kW 2733 kWh 2104 kWh 629 kWh £582 £63 £645 £14,931 23.2 yrs £-2,033
4 kW 3644 kWh 2806 kWh 838 kWh £776 £84 £860 £16,757 19.5 yrs £439
5 kW 4554 kWh 3507 kWh 1048 kWh £970 £105 £1,075 £18,584 17.3 yrs £2,911
6 kW 5465 kWh 4208 kWh 1257 kWh £1,164 £126 £1,290 £20,411 15.8 yrs £5,384
7 kW 6376 kWh 4910 kWh 1467 kWh £1,358 £147 £1,505 £22,238 14.8 yrs £7,856
8 kW 7287 kWh 5611 kWh 1676 kWh £1,552 £168 £1,720 £24,065 14.0 yrs £10,328

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.

Before you request quotes in St. Helens

Use the numbers above to sanity-check installer quotes. The main things to compare are system size, battery assumptions, payback claims, MCS certification, DNO paperwork and export assumptions.

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Check what MCS certification means

Understand DNO, G98 and G99 export limits

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Want a quote sanity check for WA10?

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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.

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Insights for WA10

Figures below are tailored to WA10 — click through for full league tables.

Big-Roof Britain Rank #1972 of 2182
4.2 kWp (UK avg 5.1 kWp)
~9 panels (≈430 W)
Solar Payback Index Rank #2381 of 2996
11.7 years (UK avg 10.8 years)
~£622 /yr • £7,307 upfront
Standing-Charge Drag Rank #2936 of 2996
41.5% (UK avg 26.6%) drag on savings
£258 fixed • ~£622 /yr value
Aspect Penalty View ranking →
East −19.7% West −20.5%
Typical output loss versus a south-facing roof (lower is better)

Seasonal solar output in WA10

Monthly generation per kilowatt of solar panels

kWh 30 Jan 48 Feb 80 Mar 106 Apr 118 May 113 Jun 112 Jul 101 Aug 83 Sep 56 Oct 37 Nov 27 Dec
Best month Worst month Winter (Dec–Feb) Other months

Winter output: 45.8% 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 304 kWh in an average month.

Your Area at a Glance

Your Electricity Rate
27.66p/kWh
Daily Fixed Charge
70.76p/day
Local Sunshine
911kWh/kW
A 1 kW system generates ~911 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: 74% • Flats: 23% • Bungalows: 4% Based on 13,384 properties

Coverage

St. Helens (100%)

Areas Covered

St Helens Town Centre, Windle, West Park, Eccleston, Thatto Heath, Moss Bank, Prescot North, Peasley Cross & Fingerpost

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.

Compare nearby areas

Nearby in North Wales and Mersey

WA11 (St. Helens)
≈2.8 km away
Local sunshine: ~908 kWh/kWp · -0% vs WA10
WA9 (St. Helens)
≈2.9 km away
Local sunshine: ~911 kWh/kWp · +0% vs WA10
L34 (Knowsley)
≈4.5 km away
Local sunshine: ~922 kWh/kWp · +1% vs WA10
L35 (Knowsley)
≈4.8 km away
Local sunshine: ~914 kWh/kWp · +0% vs WA10
L36 (Knowsley)
≈7.6 km away
Local sunshine: ~919 kWh/kWp · +1% vs WA10
L28 (Knowsley)
≈8.0 km away
Local sunshine: ~926 kWh/kWp · +2% vs WA10

Similar sunshine across the UK

DD2 (Dundee City)
~911 kWh/kWp · +0% vs WA10
BD10 (Bradford)
~911 kWh/kWp · -0% vs WA10
DD1 (Dundee City)
~911 kWh/kWp · -0% vs WA10