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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in SA66 (Pembrokeshire)

See if solar pays off for you in Pembrokeshire — price, savings and payback in under a minute (official UK data).

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
12.7 years
After this, it's pure profit
Upfront Cost
£12,207
What you pay to get started
Annual Benefit
£960
What you save every year
Profit Over 25 Years
£11,803
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: Bigger systems don’t shorten payback—cost and savings rise together per kW.
  • 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

Costs: Battery prices are typically £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 26.83p/kWh with a 51.69p/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 26.8p and exported surplus at a baseline 10p via SEG. Use the calculator above for your exact tariff.

Unit rate
26.8p/kWh
Standing charge
51.7p/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: £800, Upfront: £10,173, 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 1913 kWh 765 kWh 1148 kWh £205 £115 £320 £4,069 12.7 yrs £2,334
3 kW 2870 kWh 1148 kWh 1722 kWh £308 £172 £480 £6,104 12.7 yrs £3,500
4 kW 3827 kWh 1531 kWh 2296 kWh £411 £230 £640 £8,138 12.7 yrs £4,667
5 kW 4783 kWh 1913 kWh 2870 kWh £513 £287 £800 £10,173 12.7 yrs £5,834
6 kW 5740 kWh 2296 kWh 3444 kWh £616 £344 £960 £12,207 12.7 yrs £7,001
7 kW 6696 kWh 2679 kWh 4018 kWh £719 £402 £1,120 £14,242 12.7 yrs £8,168
8 kW 7653 kWh 3061 kWh 4592 kWh £821 £459 £1,281 £16,276 12.7 yrs £9,334

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 2,035, battery £/kWh = 700.

3 kWh battery 5 kW example → Annual benefit: £961, Upfront: £12,273, 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 1148 kWh 765 kWh £308 £77 £385 £6,169 16.0 yrs £1,522
3 kW 2870 kWh 1722 kWh 1148 kWh £462 £115 £577 £8,204 14.2 yrs £3,332
4 kW 3827 kWh 2296 kWh 1531 kWh £616 £153 £769 £10,238 13.3 yrs £5,143
5 kW 4783 kWh 2870 kWh 1913 kWh £770 £191 £961 £12,273 12.8 yrs £6,954
6 kW 5740 kWh 3444 kWh 2296 kWh £924 £230 £1,154 £14,307 12.4 yrs £8,765
7 kW 6696 kWh 4018 kWh 2679 kWh £1,078 £268 £1,346 £16,342 12.1 yrs £10,576
8 kW 7653 kWh 4592 kWh 3061 kWh £1,232 £306 £1,538 £18,376 11.9 yrs £12,386

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 2,035, battery £/kWh = 700.

5 kWh battery 5 kW example → Annual benefit: £1,042, Upfront: £13,673, Break-even: 13.1 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 £359 £57 £417 £7,569 18.2 yrs £766
3 kW 2870 kWh 2009 kWh 861 kWh £539 £86 £625 £9,604 15.4 yrs £2,898
4 kW 3827 kWh 2679 kWh 1148 kWh £719 £115 £833 £11,638 14.0 yrs £5,031
5 kW 4783 kWh 3348 kWh 1435 kWh £898 £143 £1,042 £13,673 13.1 yrs £7,164
6 kW 5740 kWh 4018 kWh 1722 kWh £1,078 £172 £1,250 £15,707 12.6 yrs £9,297
7 kW 6696 kWh 4688 kWh 2009 kWh £1,258 £201 £1,459 £17,742 12.2 yrs £11,430
8 kW 7653 kWh 5357 kWh 2296 kWh £1,437 £230 £1,667 £19,776 11.9 yrs £13,562

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 2,035, battery £/kWh = 700.

7.5 kWh battery 5 kW example → Annual benefit: £1,066, Upfront: £15,423, Break-even: 14.5 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 £375 £52 £426 £9,319 21.9 yrs £-791
3 kW 2870 kWh 2095 kWh 775 kWh £562 £77 £640 £11,354 17.8 yrs £1,438
4 kW 3827 kWh 2793 kWh 1033 kWh £749 £103 £853 £13,388 15.7 yrs £3,668
5 kW 4783 kWh 3492 kWh 1291 kWh £937 £129 £1,066 £15,423 14.5 yrs £5,897
6 kW 5740 kWh 4190 kWh 1550 kWh £1,124 £155 £1,279 £17,457 13.6 yrs £8,126
7 kW 6696 kWh 4888 kWh 1808 kWh £1,312 £181 £1,492 £19,492 13.1 yrs £10,356
8 kW 7653 kWh 5587 kWh 2066 kWh £1,499 £207 £1,706 £21,526 12.6 yrs £12,585

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 2,035, battery £/kWh = 700.

10 kWh battery 5 kW example → Annual benefit: £1,082, Upfront: £17,173, Break-even: 15.9 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 £385 £48 £433 £11,069 25.6 yrs £-2,412
3 kW 2870 kWh 2152 kWh 717 kWh £577 £72 £649 £13,104 20.2 yrs £-119
4 kW 3827 kWh 2870 kWh 957 kWh £770 £96 £866 £15,138 17.5 yrs £2,175
5 kW 4783 kWh 3587 kWh 1196 kWh £962 £120 £1,082 £17,173 15.9 yrs £4,469
6 kW 5740 kWh 4305 kWh 1435 kWh £1,155 £143 £1,298 £19,207 14.8 yrs £6,763
7 kW 6696 kWh 5022 kWh 1674 kWh £1,347 £167 £1,515 £21,242 14.0 yrs £9,057
8 kW 7653 kWh 5740 kWh 1913 kWh £1,540 £191 £1,731 £23,276 13.4 yrs £11,350

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 2,035, battery £/kWh = 700.

13.5 kWh battery 5 kW example → Annual benefit: £1,098, Upfront: £19,623, Break-even: 17.9 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 £395 £44 £439 £13,519 30.8 yrs £-4,734
3 kW 2870 kWh 2210 kWh 660 kWh £593 £66 £659 £15,554 23.6 yrs £-2,375
4 kW 3827 kWh 2946 kWh 880 kWh £791 £88 £879 £17,588 20.0 yrs £-17
5 kW 4783 kWh 3683 kWh 1100 kWh £988 £110 £1,098 £19,623 17.9 yrs £2,341
6 kW 5740 kWh 4420 kWh 1320 kWh £1,186 £132 £1,318 £21,657 16.4 yrs £4,699
7 kW 6696 kWh 5156 kWh 1540 kWh £1,383 £154 £1,537 £23,692 15.4 yrs £7,057
8 kW 7653 kWh 5893 kWh 1760 kWh £1,581 £176 £1,757 £25,726 14.6 yrs £9,416

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 2,035, 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.

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 #1261 of 2997
11.0 years (UK avg 11.3 years)
~£1,105 /yr • £12,207 upfront
Standing-Charge Drag Rank #756 of 2997
17.1% (UK avg 21.7%) drag on savings
£189 fixed • ~£1,105 /yr value

Your Area at a Glance

Your Electricity Rate
26.83p/kWh
Daily Fixed Charge
51.69p/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, Q4 2025

Installation costs: MCS certified installer data, March 2025

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