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Solar panel cost in Knowsley (L34)

See realistic solar installation costs, savings and payback for L34 (Knowsley) 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
10.3 years
After this, it's pure profit
Upfront Cost
£8,139
What you pay to get started
Annual Benefit
£787
What you save every year
Profit Over 25 Years
£11,524
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 922 kWh/kW — 8 below the regional median (930).

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 922 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)
922 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: £787, Upfront: £8,139, Break-even: 10.3 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1844 kWh 737 kWh 1106 kWh £204 £111 £315 £3,256 10.3 yrs £3,037
3 kW 2765 kWh 1106 kWh 1659 kWh £306 £166 £472 £4,883 10.3 yrs £4,555
4 kW 3687 kWh 1475 kWh 2212 kWh £408 £221 £629 £6,511 10.3 yrs £6,073
5 kW 4609 kWh 1844 kWh 2765 kWh £510 £277 £787 £8,139 10.3 yrs £7,591
6 kW 5531 kWh 2212 kWh 3319 kWh £612 £332 £944 £9,767 10.3 yrs £9,110
7 kW 6453 kWh 2581 kWh 3872 kWh £714 £387 £1,101 £11,394 10.3 yrs £10,628
8 kW 7375 kWh 2950 kWh 4425 kWh £816 £442 £1,258 £13,022 10.3 yrs £12,146

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,628, battery £/kWh = 700.

3 kWh battery 5 kW example → Annual benefit: £949, Upfront: £10,239, Break-even: 10.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1844 kWh 1106 kWh 737 kWh £306 £74 £380 £5,356 14.1 yrs £2,239
3 kW 2765 kWh 1659 kWh 1106 kWh £459 £111 £570 £6,983 12.3 yrs £4,408
4 kW 3687 kWh 2212 kWh 1475 kWh £612 £147 £759 £8,611 11.3 yrs £6,578
5 kW 4609 kWh 2765 kWh 1844 kWh £765 £184 £949 £10,239 10.8 yrs £8,747
6 kW 5531 kWh 3319 kWh 2212 kWh £918 £221 £1,139 £11,867 10.4 yrs £10,917
7 kW 6453 kWh 3872 kWh 2581 kWh £1,071 £258 £1,329 £13,494 10.2 yrs £13,086
8 kW 7375 kWh 4425 kWh 2950 kWh £1,224 £295 £1,519 £15,122 10.0 yrs £15,256

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,628, battery £/kWh = 700.

5 kWh battery 5 kW example → Annual benefit: £1,031, Upfront: £11,639, Break-even: 11.3 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1844 kWh 1291 kWh 553 kWh £357 £55 £412 £6,756 16.4 yrs £1,490
3 kW 2765 kWh 1936 kWh 830 kWh £535 £83 £618 £8,383 13.6 yrs £3,985
4 kW 3687 kWh 2581 kWh 1106 kWh £714 £111 £825 £10,011 12.1 yrs £6,480
5 kW 4609 kWh 3226 kWh 1383 kWh £892 £138 £1,031 £11,639 11.3 yrs £8,975
6 kW 5531 kWh 3872 kWh 1659 kWh £1,071 £166 £1,237 £13,267 10.7 yrs £11,470
7 kW 6453 kWh 4517 kWh 1936 kWh £1,249 £194 £1,443 £14,894 10.3 yrs £13,965
8 kW 7375 kWh 5162 kWh 2212 kWh £1,428 £221 £1,649 £16,522 10.0 yrs £16,460

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,628, battery £/kWh = 700.

7.5 kWh battery 5 kW example → Annual benefit: £1,055, Upfront: £13,389, Break-even: 12.7 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1844 kWh 1346 kWh 498 kWh £372 £50 £422 £8,506 20.2 yrs £-65
3 kW 2765 kWh 2019 kWh 747 kWh £558 £75 £633 £10,133 16.0 yrs £2,528
4 kW 3687 kWh 2692 kWh 996 kWh £745 £100 £844 £11,761 13.9 yrs £5,121
5 kW 4609 kWh 3365 kWh 1244 kWh £931 £124 £1,055 £13,389 12.7 yrs £7,714
6 kW 5531 kWh 4038 kWh 1493 kWh £1,117 £149 £1,266 £15,017 11.9 yrs £10,306
7 kW 6453 kWh 4711 kWh 1742 kWh £1,303 £174 £1,477 £16,644 11.3 yrs £12,899
8 kW 7375 kWh 5383 kWh 1991 kWh £1,489 £199 £1,688 £18,272 10.8 yrs £15,492

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,628, battery £/kWh = 700.

10 kWh battery 5 kW example → Annual benefit: £1,071, Upfront: £15,139, 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 1844 kWh 1383 kWh 461 kWh £382 £46 £429 £10,256 23.9 yrs £-1,684
3 kW 2765 kWh 2074 kWh 691 kWh £574 £69 £643 £11,883 18.5 yrs £973
4 kW 3687 kWh 2765 kWh 922 kWh £765 £92 £857 £13,511 15.8 yrs £3,631
5 kW 4609 kWh 3457 kWh 1152 kWh £956 £115 £1,071 £15,139 14.1 yrs £6,289
6 kW 5531 kWh 4148 kWh 1383 kWh £1,147 £138 £1,286 £16,767 13.0 yrs £8,947
7 kW 6453 kWh 4840 kWh 1613 kWh £1,339 £161 £1,500 £18,394 12.3 yrs £11,605
8 kW 7375 kWh 5531 kWh 1844 kWh £1,530 £184 £1,714 £20,022 11.7 yrs £14,263

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,628, battery £/kWh = 700.

13.5 kWh battery 5 kW example → Annual benefit: £1,088, Upfront: £17,589, Break-even: 16.2 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1844 kWh 1420 kWh 424 kWh £393 £42 £435 £12,706 29.2 yrs £-4,004
3 kW 2765 kWh 2129 kWh 636 kWh £589 £64 £653 £14,333 22.0 yrs £-1,281
4 kW 3687 kWh 2839 kWh 848 kWh £785 £85 £870 £15,961 18.3 yrs £1,442
5 kW 4609 kWh 3549 kWh 1060 kWh £982 £106 £1,088 £17,589 16.2 yrs £4,165
6 kW 5531 kWh 4259 kWh 1272 kWh £1,178 £127 £1,305 £19,217 14.7 yrs £6,888
7 kW 6453 kWh 4969 kWh 1484 kWh £1,374 £148 £1,523 £20,844 13.7 yrs £9,611
8 kW 7375 kWh 5678 kWh 1696 kWh £1,571 £170 £1,740 £22,472 12.9 yrs £12,334

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,628, 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 Knowsley

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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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 L34

Figures below are tailored to L34 — click through for full league tables.

Big-Roof Britain Rank #1348 of 2182
4.8 kWp (UK avg 5.1 kWp)
~10 panels (≈430 W)
Solar Payback Index Rank #1374 of 2996
10.3 years (UK avg 10.8 years)
~£787 /yr • £8,139 upfront
Standing-Charge Drag Rank #2523 of 2996
32.8% (UK avg 26.6%) drag on savings
£258 fixed • ~£787 /yr value
Aspect Penalty View ranking →
East −19.7% West −21.1%
Typical output loss versus a south-facing roof (lower is better)

Seasonal solar output in L34

Monthly generation per kilowatt of solar panels

kWh 30 Jan 49 Feb 81 Mar 108 Apr 119 May 114 Jun 114 Jul 103 Aug 83 Sep 57 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 77 kWh. So a typical 4 kW home system would generate roughly 141 kWh in winter, or 307 kWh in an average month.

Your Area at a Glance

Your Electricity Rate
27.66p/kWh
Daily Fixed Charge
70.76p/day
Local Sunshine
922kWh/kW
A 1 kW system generates ~922 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: 64% • Flats: 24% • Bungalows: 7% Based on 5,223 properties

Coverage

Knowsley (91%)|St. Helens (9%)

Areas Covered

Prescot North, Eccleston, St Michaels, Stockbridge, Prescot South, Northwood, Windle

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

L35 (Knowsley)
≈1.7 km away
Local sunshine: ~914 kWh/kWp · -1% vs L34
L36 (Knowsley)
≈3.1 km away
Local sunshine: ~919 kWh/kWp · -0% vs L34
L28 (Knowsley)
≈4.1 km away
Local sunshine: ~926 kWh/kWp · +0% vs L34
WA10 (St. Helens)
≈4.5 km away
Local sunshine: ~911 kWh/kWp · -1% vs L34
L27 (Liverpool)
≈5.1 km away
Local sunshine: ~921 kWh/kWp · -0% vs L34
L14 (Liverpool)
≈5.1 km away
Local sunshine: ~926 kWh/kWp · +0% vs L34

Similar sunshine across the UK

NE4 (Newcastle upon Tyne)
~922 kWh/kWp · +0% vs L34
BT21 (Ards and North Down)
~922 kWh/kWp · +0% vs L34
SA38 (Carmarthenshire)
~922 kWh/kWp · -0% vs L34