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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in SA37 (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
12.8 years
After this, it's pure profit
Upfront Cost
£12,207
What you pay to get started
Annual Benefit
£953
What you save every year
Profit Over 25 Years
£11,629
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 950 kWh/kW — 19 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 950 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)
950 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: £795, Upfront: £10,173, 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 1899 kWh 760 kWh 1140 kWh £204 £114 £318 £4,069 12.8 yrs £2,287
3 kW 2849 kWh 1140 kWh 1709 kWh £306 £171 £477 £6,104 12.8 yrs £3,431
4 kW 3799 kWh 1520 kWh 2279 kWh £408 £228 £636 £8,138 12.8 yrs £4,574
5 kW 4749 kWh 1899 kWh 2849 kWh £510 £285 £795 £10,173 12.8 yrs £5,718
6 kW 5698 kWh 2279 kWh 3419 kWh £612 £342 £953 £12,207 12.8 yrs £6,862
7 kW 6648 kWh 2659 kWh 3989 kWh £713 £399 £1,112 £14,242 12.8 yrs £8,005
8 kW 7598 kWh 3039 kWh 4559 kWh £815 £456 £1,271 £16,276 12.8 yrs £9,149

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: £954, Upfront: £12,273, Break-even: 12.9 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1899 kWh 1140 kWh 760 kWh £306 £76 £382 £6,169 16.2 yrs £1,466
3 kW 2849 kWh 1709 kWh 1140 kWh £459 £114 £573 £8,204 14.3 yrs £3,249
4 kW 3799 kWh 2279 kWh 1520 kWh £612 £152 £763 £10,238 13.4 yrs £5,032
5 kW 4749 kWh 2849 kWh 1899 kWh £764 £190 £954 £12,273 12.9 yrs £6,815
6 kW 5698 kWh 3419 kWh 2279 kWh £917 £228 £1,145 £14,307 12.5 yrs £8,598
7 kW 6648 kWh 3989 kWh 2659 kWh £1,070 £266 £1,336 £16,342 12.2 yrs £10,381
8 kW 7598 kWh 4559 kWh 3039 kWh £1,223 £304 £1,527 £18,376 12.0 yrs £12,164

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: £1,034, Upfront: £13,673, Break-even: 13.2 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1899 kWh 1330 kWh 570 kWh £357 £57 £414 £7,569 18.3 yrs £705
3 kW 2849 kWh 1994 kWh 855 kWh £535 £85 £621 £9,604 15.5 yrs £2,808
4 kW 3799 kWh 2659 kWh 1140 kWh £713 £114 £827 £11,638 14.1 yrs £4,910
5 kW 4749 kWh 3324 kWh 1425 kWh £892 £142 £1,034 £13,673 13.2 yrs £7,013
6 kW 5698 kWh 3989 kWh 1709 kWh £1,070 £171 £1,241 £15,707 12.7 yrs £9,116
7 kW 6648 kWh 4654 kWh 1994 kWh £1,249 £199 £1,448 £17,742 12.3 yrs £11,218
8 kW 7598 kWh 5318 kWh 2279 kWh £1,427 £228 £1,655 £19,776 12.0 yrs £13,321

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: £1,058, Upfront: £15,423, Break-even: 14.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1899 kWh 1387 kWh 513 kWh £372 £51 £423 £9,319 22.0 yrs £-853
3 kW 2849 kWh 2080 kWh 769 kWh £558 £77 £635 £11,354 17.9 yrs £1,346
4 kW 3799 kWh 2773 kWh 1026 kWh £744 £103 £847 £13,388 15.8 yrs £3,544
5 kW 4749 kWh 3466 kWh 1282 kWh £930 £128 £1,058 £15,423 14.6 yrs £5,743
6 kW 5698 kWh 4160 kWh 1539 kWh £1,116 £154 £1,270 £17,457 13.7 yrs £7,941
7 kW 6648 kWh 4853 kWh 1795 kWh £1,302 £179 £1,482 £19,492 13.2 yrs £10,140
8 kW 7598 kWh 5546 kWh 2051 kWh £1,488 £205 £1,693 £21,526 12.7 yrs £12,338

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: £1,074, Upfront: £17,173, Break-even: 16.0 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1899 kWh 1425 kWh 475 kWh £382 £47 £430 £11,069 25.8 yrs £-2,475
3 kW 2849 kWh 2137 kWh 712 kWh £573 £71 £645 £13,104 20.3 yrs £-213
4 kW 3799 kWh 2849 kWh 950 kWh £764 £95 £859 £15,138 17.6 yrs £2,050
5 kW 4749 kWh 3561 kWh 1187 kWh £956 £119 £1,074 £17,173 16.0 yrs £4,312
6 kW 5698 kWh 4274 kWh 1425 kWh £1,147 £142 £1,289 £19,207 14.9 yrs £6,575
7 kW 6648 kWh 4986 kWh 1662 kWh £1,338 £166 £1,504 £21,242 14.1 yrs £8,837
8 kW 7598 kWh 5698 kWh 1899 kWh £1,529 £190 £1,719 £23,276 13.5 yrs £11,100

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: £1,090, Upfront: £19,623, Break-even: 18.0 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1899 kWh 1463 kWh 437 kWh £392 £44 £436 £13,519 31.0 yrs £-4,797
3 kW 2849 kWh 2194 kWh 655 kWh £589 £66 £654 £15,554 23.8 yrs £-2,471
4 kW 3799 kWh 2925 kWh 874 kWh £785 £87 £872 £17,588 20.2 yrs £-144
5 kW 4749 kWh 3656 kWh 1092 kWh £981 £109 £1,090 £19,623 18.0 yrs £2,182
6 kW 5698 kWh 4388 kWh 1311 kWh £1,177 £131 £1,308 £21,657 16.6 yrs £4,508
7 kW 6648 kWh 5119 kWh 1529 kWh £1,373 £153 £1,526 £23,692 15.5 yrs £6,835
8 kW 7598 kWh 5850 kWh 1747 kWh £1,570 £175 £1,744 £25,726 14.7 yrs £9,161

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 SA37

Figures below are tailored to SA37 — click through for full league tables.

Big-Roof Britain Rank #14 of 2182
7.6 kWp (UK avg 5.1 kWp)
~16 panels (≈430 W)
Solar Payback Index Rank #1455 of 2997
11.1 years (UK avg 11.3 years)
~£1,097 /yr • £12,207 upfront
Standing-Charge Drag Rank #813 of 2997
17.2% (UK avg 21.7%) drag on savings
£189 fixed • ~£1,097 /yr value

Your Area at a Glance

Your Electricity Rate
26.83p/kWh
Daily Fixed Charge
51.69p/day
Local Sunshine
950kWh/kW
A 1 kW system generates ~950 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: 70% • Flats: 3% • Bungalows: 27% Based on 410 properties

Coverage

Pembrokeshire (92%)|Carmarthenshire (5%)|Ceredigion (3%)

Areas Covered

Boncath and Clydau, Cenarth and Llangeler, Crymych and Mynachlog-ddu, Teifi, Cilgerran and Eglwyswrw

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

SA35 (Pembrokeshire)
≈5.5 km away
Local sunshine: ~915 kWh/kWp · -4% vs SA37
SA36 (Pembrokeshire)
≈6.8 km away
Local sunshine: ~935 kWh/kWp · -2% vs SA37
SA41 (Pembrokeshire)
≈7.9 km away
Local sunshine: ~935 kWh/kWp · -2% vs SA37
SA43 (Ceredigion)
≈8.6 km away
Local sunshine: ~977 kWh/kWp · +3% vs SA37
SA38 (Carmarthenshire)
≈8.7 km away
Local sunshine: ~922 kWh/kWp · -3% vs SA37
SA44 (Ceredigion)
≈16.7 km away
Local sunshine: ~893 kWh/kWp · -6% vs SA37

Similar sunshine across the UK

DE65 (South Derbyshire)
~950 kWh/kWp · +0% vs SA37
EX34 (North Devon)
~950 kWh/kWp · -0% vs SA37
SY4 (Shropshire)
~950 kWh/kWp · -0% vs SA37