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Solar panel cost in Pembrokeshire (SA42)

See realistic solar installation costs, savings and payback for SA42 (Pembrokeshire) 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
£9,767
What you pay to get started
Annual Benefit
£945
What you save every year
Profit Over 25 Years
£13,865
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 South Wales, the current unit rate is 26.33p/kWh with a 57.84p/day standing charge. Your postcode’s south-facing sunshine yield is 953 kWh/kW — 16 below the regional median (968).

Read the full story

A typical roof here lands around 6.0 kW, with most eligible homes comfortably fitting within 3–6 kW. Each kilowatt of panels produces roughly 953 kWh per year on a south-facing roof. We value self-used electricity at 26.3p and exported surplus at a baseline 10p via SEG. Use the calculator above for your exact tariff.

Unit rate
26.3p/kWh
Standing charge
57.8p/day
Sunshine yield (south)
953 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: £788, 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 1906 kWh 762 kWh 1144 kWh £201 £114 £315 £3,256 10.3 yrs £3,046
3 kW 2859 kWh 1144 kWh 1715 kWh £301 £172 £473 £4,883 10.3 yrs £4,569
4 kW 3812 kWh 1525 kWh 2287 kWh £401 £229 £630 £6,511 10.3 yrs £6,093
5 kW 4765 kWh 1906 kWh 2859 kWh £502 £286 £788 £8,139 10.3 yrs £7,616
6 kW 5718 kWh 2287 kWh 3431 kWh £602 £343 £945 £9,767 10.3 yrs £9,139
7 kW 6671 kWh 2668 kWh 4002 kWh £703 £400 £1,103 £11,394 10.3 yrs £10,662
8 kW 7624 kWh 3050 kWh 4574 kWh £803 £457 £1,260 £13,022 10.3 yrs £12,185

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: £943, Upfront: £10,239, Break-even: 10.9 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1906 kWh 1144 kWh 762 kWh £301 £76 £377 £5,356 14.2 yrs £2,191
3 kW 2859 kWh 1715 kWh 1144 kWh £452 £114 £566 £6,983 12.3 yrs £4,337
4 kW 3812 kWh 2287 kWh 1525 kWh £602 £152 £755 £8,611 11.4 yrs £6,482
5 kW 4765 kWh 2859 kWh 1906 kWh £753 £191 £943 £10,239 10.9 yrs £8,628
6 kW 5718 kWh 3431 kWh 2287 kWh £903 £229 £1,132 £11,867 10.5 yrs £10,774
7 kW 6671 kWh 4002 kWh 2668 kWh £1,054 £267 £1,321 £13,494 10.2 yrs £12,919
8 kW 7624 kWh 4574 kWh 3050 kWh £1,204 £305 £1,509 £15,122 10.0 yrs £15,065

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: £1,021, Upfront: £11,639, Break-even: 11.4 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1906 kWh 1334 kWh 572 kWh £351 £57 £408 £6,756 16.5 yrs £1,414
3 kW 2859 kWh 2001 kWh 858 kWh £527 £86 £613 £8,383 13.7 yrs £3,871
4 kW 3812 kWh 2668 kWh 1144 kWh £703 £114 £817 £10,011 12.3 yrs £6,327
5 kW 4765 kWh 3335 kWh 1429 kWh £878 £143 £1,021 £11,639 11.4 yrs £8,784
6 kW 5718 kWh 4002 kWh 1715 kWh £1,054 £172 £1,225 £13,267 10.8 yrs £11,241
7 kW 6671 kWh 4670 kWh 2001 kWh £1,229 £200 £1,430 £14,894 10.4 yrs £13,698
8 kW 7624 kWh 5337 kWh 2287 kWh £1,405 £229 £1,634 £16,522 10.1 yrs £16,155

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: £1,044, Upfront: £13,389, Break-even: 12.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1906 kWh 1391 kWh 515 kWh £366 £51 £418 £8,506 20.4 yrs £-150
3 kW 2859 kWh 2087 kWh 772 kWh £550 £77 £627 £10,133 16.2 yrs £2,401
4 kW 3812 kWh 2783 kWh 1029 kWh £733 £103 £836 £11,761 14.1 yrs £4,951
5 kW 4765 kWh 3478 kWh 1287 kWh £916 £129 £1,044 £13,389 12.8 yrs £7,501
6 kW 5718 kWh 4174 kWh 1544 kWh £1,099 £154 £1,253 £15,017 12.0 yrs £10,051
7 kW 6671 kWh 4870 kWh 1801 kWh £1,282 £180 £1,462 £16,644 11.4 yrs £12,602
8 kW 7624 kWh 5565 kWh 2058 kWh £1,465 £206 £1,671 £18,272 10.9 yrs £15,152

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: £1,060, Upfront: £15,139, Break-even: 14.3 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1906 kWh 1429 kWh 476 kWh £376 £48 £424 £10,256 24.2 yrs £-1,775
3 kW 2859 kWh 2144 kWh 715 kWh £565 £71 £636 £11,883 18.7 yrs £837
4 kW 3812 kWh 2859 kWh 953 kWh £753 £95 £848 £13,511 15.9 yrs £3,450
5 kW 4765 kWh 3574 kWh 1191 kWh £941 £119 £1,060 £15,139 14.3 yrs £6,062
6 kW 5718 kWh 4288 kWh 1429 kWh £1,129 £143 £1,272 £16,767 13.2 yrs £8,675
7 kW 6671 kWh 5003 kWh 1668 kWh £1,317 £167 £1,484 £18,394 12.4 yrs £11,287
8 kW 7624 kWh 5718 kWh 1906 kWh £1,506 £191 £1,696 £20,022 11.8 yrs £13,900

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: £1,076, Upfront: £17,589, Break-even: 16.4 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1906 kWh 1468 kWh 438 kWh £386 £44 £430 £12,706 29.5 yrs £-4,101
3 kW 2859 kWh 2201 kWh 658 kWh £580 £66 £645 £14,333 22.2 yrs £-1,426
4 kW 3812 kWh 2935 kWh 877 kWh £773 £88 £860 £15,961 18.5 yrs £1,249
5 kW 4765 kWh 3669 kWh 1096 kWh £966 £110 £1,076 £17,589 16.4 yrs £3,924
6 kW 5718 kWh 4403 kWh 1315 kWh £1,159 £132 £1,291 £19,217 14.9 yrs £6,598
7 kW 6671 kWh 5137 kWh 1534 kWh £1,352 £153 £1,506 £20,844 13.8 yrs £9,273
8 kW 7624 kWh 5870 kWh 1753 kWh £1,546 £175 £1,721 £22,472 13.1 yrs £11,948

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 Pembrokeshire

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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Insights for SA42

Figures below are tailored to SA42 — click through for full league tables.

Big-Roof Britain Rank #40 of 2182
7.2 kWp (UK avg 5.1 kWp)
~15 panels (≈430 W)
Solar Payback Index Rank #1423 of 2996
10.3 years (UK avg 10.8 years)
~£945 /yr • £9,767 upfront
Standing-Charge Drag Rank #954 of 2996
22.3% (UK avg 26.6%) drag on savings
£211 fixed • ~£945 /yr value
Aspect Penalty View ranking →
East −17.6% West −21.3%
Typical output loss versus a south-facing roof (lower is better)

Seasonal solar output in SA42

Monthly generation per kilowatt of solar panels

kWh 32 Jan 50 Feb 84 Mar 115 Apr 124 May 121 Jun 117 Jul 105 Aug 84 Sep 59 Oct 36 Nov 26 Dec
Best month Worst month Winter (Dec–Feb) Other months

Winter output: 45.4% 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 36 kWh per month; the average month produces around 79 kWh. So a typical 4 kW home system would generate roughly 144 kWh in winter, or 318 kWh in an average month.

Your Area at a Glance

Your Electricity Rate
26.33p/kWh
Daily Fixed Charge
57.84p/day
Local Sunshine
953kWh/kW
A 1 kW system generates ~953 kWh per year. A typical home uses ~2,700 kWh per year.
Typical System Size
6.0kW
For houses & bungalows in this area

Local Property Data

Property Types

Houses: 72% • Flats: 6% • Bungalows: 21% Based on 755 properties

Coverage

Pembrokeshire (99%)|Ceredigion (1%)

Areas Covered

Newport and Dinas, St Dogmaels, Bro Gwaun, Fishguard: North East, Teifi

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 South Wales

SA41 (Pembrokeshire)
≈9.7 km away
Local sunshine: ~935 kWh/kWp · -2% vs SA42
SA65 (Pembrokeshire)
≈9.9 km away
Local sunshine: ~953 kWh/kWp · -0% vs SA42
SA64 (Pembrokeshire)
≈11.3 km away
Local sunshine: ~953 kWh/kWp · -0% vs SA42
SA43 (Ceredigion)
≈14.7 km away
Local sunshine: ~977 kWh/kWp · +2% vs SA42
SA36 (Pembrokeshire)
≈16.7 km away
Local sunshine: ~935 kWh/kWp · -2% vs SA42
SA63 (Pembrokeshire)
≈16.7 km away
Local sunshine: ~979 kWh/kWp · +3% vs SA42

Similar sunshine across the UK

L22 (Sefton)
~953 kWh/kWp · -0% vs SA42
S26 (Rotherham)
~953 kWh/kWp · +0% vs SA42
NG80 (Broxtowe)
~953 kWh/kWp · -0% vs SA42