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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in SA63 (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
12.4 years
After this, it's pure profit
Upfront Cost
£12,207
What you pay to get started
Annual Benefit
£983
What you save every year
Profit Over 25 Years
£12,372
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 979 kWh/kW — 11 above 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 979 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)
979 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: £819, Upfront: £10,173, Break-even: 12.4 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1959 kWh 783 kWh 1175 kWh £210 £118 £328 £4,069 12.4 yrs £2,486
3 kW 2938 kWh 1175 kWh 1763 kWh £315 £176 £492 £6,104 12.4 yrs £3,728
4 kW 3917 kWh 1567 kWh 2350 kWh £420 £235 £655 £8,138 12.4 yrs £4,971
5 kW 4897 kWh 1959 kWh 2938 kWh £526 £294 £819 £10,173 12.4 yrs £6,214
6 kW 5876 kWh 2350 kWh 3526 kWh £631 £353 £983 £12,207 12.4 yrs £7,457
7 kW 6855 kWh 2742 kWh 4113 kWh £736 £411 £1,147 £14,242 12.4 yrs £8,699
8 kW 7835 kWh 3134 kWh 4701 kWh £841 £470 £1,311 £16,276 12.4 yrs £9,942

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: £984, Upfront: £12,273, Break-even: 12.5 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1959 kWh 1175 kWh 783 kWh £315 £78 £394 £6,169 15.7 yrs £1,704
3 kW 2938 kWh 1763 kWh 1175 kWh £473 £118 £590 £8,204 13.9 yrs £3,606
4 kW 3917 kWh 2350 kWh 1567 kWh £631 £157 £787 £10,238 13.0 yrs £5,508
5 kW 4897 kWh 2938 kWh 1959 kWh £788 £196 £984 £12,273 12.5 yrs £7,410
6 kW 5876 kWh 3526 kWh 2350 kWh £946 £235 £1,181 £14,307 12.1 yrs £9,312
7 kW 6855 kWh 4113 kWh 2742 kWh £1,104 £274 £1,378 £16,342 11.9 yrs £11,214
8 kW 7835 kWh 4701 kWh 3134 kWh £1,261 £313 £1,575 £18,376 11.7 yrs £13,116

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: £1,067, Upfront: £13,673, 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 1959 kWh 1371 kWh 588 kWh £368 £59 £427 £7,569 17.7 yrs £963
3 kW 2938 kWh 2057 kWh 881 kWh £552 £88 £640 £9,604 15.0 yrs £3,195
4 kW 3917 kWh 2742 kWh 1175 kWh £736 £118 £853 £11,638 13.6 yrs £5,427
5 kW 4897 kWh 3428 kWh 1469 kWh £920 £147 £1,067 £13,673 12.8 yrs £7,658
6 kW 5876 kWh 4113 kWh 1763 kWh £1,104 £176 £1,280 £15,707 12.3 yrs £9,890
7 kW 6855 kWh 4799 kWh 2057 kWh £1,288 £206 £1,493 £17,742 11.9 yrs £12,122
8 kW 7835 kWh 5484 kWh 2350 kWh £1,471 £235 £1,706 £19,776 11.6 yrs £14,354

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: £1,091, Upfront: £15,423, 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 1959 kWh 1430 kWh 529 kWh £384 £53 £437 £9,319 21.3 yrs £-589
3 kW 2938 kWh 2145 kWh 793 kWh £575 £79 £655 £11,354 17.3 yrs £1,742
4 kW 3917 kWh 2860 kWh 1058 kWh £767 £106 £873 £13,388 15.3 yrs £4,072
5 kW 4897 kWh 3575 kWh 1322 kWh £959 £132 £1,091 £15,423 14.1 yrs £6,403
6 kW 5876 kWh 4290 kWh 1587 kWh £1,151 £159 £1,310 £17,457 13.3 yrs £8,734
7 kW 6855 kWh 5004 kWh 1851 kWh £1,343 £185 £1,528 £19,492 12.8 yrs £11,064
8 kW 7835 kWh 5719 kWh 2115 kWh £1,535 £212 £1,746 £21,526 12.3 yrs £13,395

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: £1,108, Upfront: £17,173, Break-even: 15.5 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1959 kWh 1469 kWh 490 kWh £394 £49 £443 £11,069 25.0 yrs £-2,207
3 kW 2938 kWh 2204 kWh 735 kWh £591 £73 £665 £13,104 19.7 yrs £190
4 kW 3917 kWh 2938 kWh 979 kWh £788 £98 £886 £15,138 17.1 yrs £2,586
5 kW 4897 kWh 3673 kWh 1224 kWh £985 £122 £1,108 £17,173 15.5 yrs £4,983
6 kW 5876 kWh 4407 kWh 1469 kWh £1,182 £147 £1,329 £19,207 14.4 yrs £7,379
7 kW 6855 kWh 5142 kWh 1714 kWh £1,379 £171 £1,551 £21,242 13.7 yrs £9,776
8 kW 7835 kWh 5876 kWh 1959 kWh £1,577 £196 £1,772 £23,276 13.1 yrs £12,172

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: £1,124, Upfront: £19,623, Break-even: 17.5 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1959 kWh 1508 kWh 450 kWh £405 £45 £450 £13,519 30.1 yrs £-4,525
3 kW 2938 kWh 2262 kWh 676 kWh £607 £68 £675 £15,554 23.1 yrs £-2,063
4 kW 3917 kWh 3016 kWh 901 kWh £809 £90 £899 £17,588 19.6 yrs £400
5 kW 4897 kWh 3770 kWh 1126 kWh £1,012 £113 £1,124 £19,623 17.5 yrs £2,862
6 kW 5876 kWh 4525 kWh 1351 kWh £1,214 £135 £1,349 £21,657 16.1 yrs £5,325
7 kW 6855 kWh 5279 kWh 1577 kWh £1,416 £158 £1,574 £23,692 15.1 yrs £7,787
8 kW 7835 kWh 6033 kWh 1802 kWh £1,619 £180 £1,799 £25,726 14.3 yrs £10,250

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 SA63

Figures below are tailored to SA63 — click through for full league tables.

Big-Roof Britain Rank #57 of 2182
7.0 kWp (UK avg 5.1 kWp)
~15 panels (≈430 W)
Solar Payback Index Rank #1058 of 2997
10.8 years (UK avg 11.3 years)
~£1,132 /yr • £12,207 upfront
Standing-Charge Drag Rank #662 of 2997
16.7% (UK avg 21.7%) drag on savings
£189 fixed • ~£1,132 /yr value

Your Area at a Glance

Your Electricity Rate
26.83p/kWh
Daily Fixed Charge
51.69p/day
Local Sunshine
979kWh/kW
A 1 kW system generates ~979 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: 75% • Flats: 1% • Bungalows: 24% Based on 290 properties

Coverage

Pembrokeshire (100%)

Areas Covered

Wiston, Bro Gwaun, Haverfordwest: Priory

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

SA66 (Pembrokeshire)
≈8.8 km away
Local sunshine: ~957 kWh/kWp · -2% vs SA63
SA61 (Pembrokeshire)
≈10.6 km away
Local sunshine: ~984 kWh/kWp · +0% vs SA63
SA67 (Pembrokeshire)
≈11.2 km away
Local sunshine: ~972 kWh/kWp · -1% vs SA63
SA62 (Pembrokeshire)
≈13.3 km away
Local sunshine: ~1,029 kWh/kWp · +5% vs SA63
SA65 (Pembrokeshire)
≈16.2 km away
Local sunshine: ~953 kWh/kWp · -3% vs SA63
SA42 (Pembrokeshire)
≈16.7 km away
Local sunshine: ~953 kWh/kWp · -3% vs SA63

Similar sunshine across the UK

HU8 (Kingston upon Hull, City of)
~979 kWh/kWp · -0% vs SA63
HP23 (Dacorum)
~980 kWh/kWp · +0% vs SA63
LN10 (East Lindsey)
~980 kWh/kWp · +0% vs SA63