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Solar panel cost in Pembrokeshire (SA66)

See realistic solar installation costs, savings and payback for SA66 (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
£949
What you save every year
Profit Over 25 Years
£13,956
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 957 kWh/kW — 12 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 957 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)
957 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: £791, 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 1913 kWh 765 kWh 1148 kWh £202 £115 £316 £3,256 10.3 yrs £3,071
3 kW 2870 kWh 1148 kWh 1722 kWh £302 £172 £474 £4,883 10.3 yrs £4,606
4 kW 3827 kWh 1531 kWh 2296 kWh £403 £230 £633 £6,511 10.3 yrs £6,141
5 kW 4783 kWh 1913 kWh 2870 kWh £504 £287 £791 £8,139 10.3 yrs £7,676
6 kW 5740 kWh 2296 kWh 3444 kWh £605 £344 £949 £9,767 10.3 yrs £9,212
7 kW 6696 kWh 2679 kWh 4018 kWh £705 £402 £1,107 £11,394 10.3 yrs £10,747
8 kW 7653 kWh 3061 kWh 4592 kWh £806 £459 £1,265 £13,022 10.3 yrs £12,282

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: £947, 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 1913 kWh 1148 kWh 765 kWh £302 £77 £379 £5,356 14.1 yrs £2,220
3 kW 2870 kWh 1722 kWh 1148 kWh £453 £115 £568 £6,983 12.3 yrs £4,380
4 kW 3827 kWh 2296 kWh 1531 kWh £605 £153 £758 £8,611 11.4 yrs £6,541
5 kW 4783 kWh 2870 kWh 1913 kWh £756 £191 £947 £10,239 10.8 yrs £8,701
6 kW 5740 kWh 3444 kWh 2296 kWh £907 £230 £1,136 £11,867 10.4 yrs £10,861
7 kW 6696 kWh 4018 kWh 2679 kWh £1,058 £268 £1,326 £13,494 10.2 yrs £13,021
8 kW 7653 kWh 4592 kWh 3061 kWh £1,209 £306 £1,515 £15,122 10.0 yrs £15,181

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: £1,025, 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 1913 kWh 1339 kWh 574 kWh £353 £57 £410 £6,756 16.5 yrs £1,445
3 kW 2870 kWh 2009 kWh 861 kWh £529 £86 £615 £8,383 13.6 yrs £3,918
4 kW 3827 kWh 2679 kWh 1148 kWh £705 £115 £820 £10,011 12.2 yrs £6,390
5 kW 4783 kWh 3348 kWh 1435 kWh £882 £143 £1,025 £11,639 11.4 yrs £8,863
6 kW 5740 kWh 4018 kWh 1722 kWh £1,058 £172 £1,230 £13,267 10.8 yrs £11,336
7 kW 6696 kWh 4688 kWh 2009 kWh £1,234 £201 £1,435 £14,894 10.4 yrs £13,808
8 kW 7653 kWh 5357 kWh 2296 kWh £1,411 £230 £1,640 £16,522 10.1 yrs £16,281

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: £1,049, 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 1913 kWh 1397 kWh 517 kWh £368 £52 £419 £8,506 20.3 yrs £-117
3 kW 2870 kWh 2095 kWh 775 kWh £552 £77 £629 £10,133 16.1 yrs £2,449
4 kW 3827 kWh 2793 kWh 1033 kWh £735 £103 £839 £11,761 14.0 yrs £5,015
5 kW 4783 kWh 3492 kWh 1291 kWh £919 £129 £1,049 £13,389 12.8 yrs £7,582
6 kW 5740 kWh 4190 kWh 1550 kWh £1,103 £155 £1,258 £15,017 11.9 yrs £10,148
7 kW 6696 kWh 4888 kWh 1808 kWh £1,287 £181 £1,468 £16,644 11.3 yrs £12,714
8 kW 7653 kWh 5587 kWh 2066 kWh £1,471 £207 £1,678 £18,272 10.9 yrs £15,281

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: £1,064, Upfront: £15,139, Break-even: 14.2 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1913 kWh 1435 kWh 478 kWh £378 £48 £426 £10,256 24.1 yrs £-1,742
3 kW 2870 kWh 2152 kWh 717 kWh £567 £72 £638 £11,883 18.6 yrs £886
4 kW 3827 kWh 2870 kWh 957 kWh £756 £96 £851 £13,511 15.9 yrs £3,515
5 kW 4783 kWh 3587 kWh 1196 kWh £945 £120 £1,064 £15,139 14.2 yrs £6,144
6 kW 5740 kWh 4305 kWh 1435 kWh £1,133 £143 £1,277 £16,767 13.1 yrs £8,773
7 kW 6696 kWh 5022 kWh 1674 kWh £1,322 £167 £1,490 £18,394 12.3 yrs £11,402
8 kW 7653 kWh 5740 kWh 1913 kWh £1,511 £191 £1,703 £20,022 11.8 yrs £14,030

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: £1,080, Upfront: £17,589, Break-even: 16.3 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1913 kWh 1473 kWh 440 kWh £388 £44 £432 £12,706 29.4 yrs £-4,067
3 kW 2870 kWh 2210 kWh 660 kWh £582 £66 £648 £14,333 22.1 yrs £-1,376
4 kW 3827 kWh 2946 kWh 880 kWh £776 £88 £864 £15,961 18.5 yrs £1,315
5 kW 4783 kWh 3683 kWh 1100 kWh £970 £110 £1,080 £17,589 16.3 yrs £4,006
6 kW 5740 kWh 4420 kWh 1320 kWh £1,164 £132 £1,296 £19,217 14.8 yrs £6,698
7 kW 6696 kWh 5156 kWh 1540 kWh £1,358 £154 £1,512 £20,844 13.8 yrs £9,389
8 kW 7653 kWh 5893 kWh 1760 kWh £1,552 £176 £1,728 £22,472 13.0 yrs £12,080

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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Understand DNO, G98 and G99 export limits

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Insights for SA66

Figures below are tailored to SA66 — click through for full league tables.

Big-Roof Britain Rank #15 of 2182
7.6 kWp (UK avg 5.1 kWp)
~16 panels (≈430 W)
Solar Payback Index Rank #1426 of 2996
10.3 years (UK avg 10.8 years)
~£949 /yr • £9,767 upfront
Standing-Charge Drag Rank #941 of 2996
22.2% (UK avg 26.6%) drag on savings
£211 fixed • ~£949 /yr value
Aspect Penalty View ranking →
East −17.6% West −21.0%
Typical output loss versus a south-facing roof (lower is better)

Seasonal solar output in SA66

Monthly generation per kilowatt of solar panels

kWh 34 Jan 50 Feb 84 Mar 114 Apr 123 May 120 Jun 116 Jul 104 Aug 86 Sep 59 Oct 40 Nov 28 Dec
Best month Worst month Winter (Dec–Feb) Other months

Winter output: 46.8% 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 37 kWh per month; the average month produces around 80 kWh. So a typical 4 kW home system would generate roughly 149 kWh in winter, or 319 kWh in an average month.

Your Area at a Glance

Your Electricity Rate
26.33p/kWh
Daily Fixed Charge
57.84p/day
Local Sunshine
957kWh/kW
A 1 kW system generates ~957 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: 64% • Flats: 3% • Bungalows: 32% Based on 855 properties

Coverage

Pembrokeshire (92%)|Carmarthenshire (8%)

Areas Covered

Maenclochog, Crymych and Mynachlog-ddu, Llanboidy, Narberth: Urban, Wiston, Bro Gwaun, Martletwy, Lampeter Velfrey + 1 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.

Compare nearby areas

Nearby in South Wales

SA67 (Pembrokeshire)
≈8.1 km away
Local sunshine: ~972 kWh/kWp · +2% vs SA66
SA34 (Carmarthenshire)
≈8.7 km away
Local sunshine: ~995 kWh/kWp · +4% vs SA66
SA63 (Pembrokeshire)
≈8.8 km away
Local sunshine: ~979 kWh/kWp · +2% vs SA66
SA36 (Pembrokeshire)
≈12.6 km away
Local sunshine: ~935 kWh/kWp · -2% vs SA66
SA41 (Pembrokeshire)
≈13.9 km away
Local sunshine: ~935 kWh/kWp · -2% vs SA66
SA68 (Pembrokeshire)
≈15.5 km away
Local sunshine: ~1,014 kWh/kWp · +6% vs SA66

Similar sunshine across the UK

LA17 (Westmorland and Furness)
~957 kWh/kWp · -0% vs SA66
DH5 (Sunderland)
~957 kWh/kWp · +0% vs SA66
B92 (Solihull)
~957 kWh/kWp · +0% vs SA66