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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in SA69 (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
12.0 years
After this, it's pure profit
Upfront Cost
£12,207
What you pay to get started
Annual Benefit
£1,017
What you save every year
Profit Over 25 Years
£13,230
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 1014 kWh/kW — 45 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 1014 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)
1014 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: £848, Upfront: £10,173, Break-even: 12.0 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2027 kWh 811 kWh 1216 kWh £218 £122 £339 £4,069 12.0 yrs £2,714
3 kW 3041 kWh 1216 kWh 1824 kWh £326 £182 £509 £6,104 12.0 yrs £4,071
4 kW 4054 kWh 1622 kWh 2432 kWh £435 £243 £678 £8,138 12.0 yrs £5,428
5 kW 5068 kWh 2027 kWh 3041 kWh £544 £304 £848 £10,173 12.0 yrs £6,785
6 kW 6081 kWh 2432 kWh 3649 kWh £653 £365 £1,017 £12,207 12.0 yrs £8,143
7 kW 7095 kWh 2838 kWh 4257 kWh £761 £426 £1,187 £14,242 12.0 yrs £9,500
8 kW 8108 kWh 3243 kWh 4865 kWh £870 £486 £1,357 £16,276 12.0 yrs £10,857

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: £1,018, Upfront: £12,273, Break-even: 12.0 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2027 kWh 1216 kWh 811 kWh £326 £81 £407 £6,169 15.1 yrs £1,979
3 kW 3041 kWh 1824 kWh 1216 kWh £489 £122 £611 £8,204 13.4 yrs £4,018
4 kW 4054 kWh 2432 kWh 1622 kWh £653 £162 £815 £10,238 12.6 yrs £6,058
5 kW 5068 kWh 3041 kWh 2027 kWh £816 £203 £1,018 £12,273 12.0 yrs £8,097
6 kW 6081 kWh 3649 kWh 2432 kWh £979 £243 £1,222 £14,307 11.7 yrs £10,136
7 kW 7095 kWh 4257 kWh 2838 kWh £1,142 £284 £1,426 £16,342 11.5 yrs £12,176
8 kW 8108 kWh 4865 kWh 3243 kWh £1,305 £324 £1,630 £18,376 11.3 yrs £14,215

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: £1,104, Upfront: £13,673, 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 2027 kWh 1419 kWh 608 kWh £381 £61 £442 £7,569 17.1 yrs £1,261
3 kW 3041 kWh 2128 kWh 912 kWh £571 £91 £662 £9,604 14.5 yrs £3,642
4 kW 4054 kWh 2838 kWh 1216 kWh £761 £122 £883 £11,638 13.2 yrs £6,022
5 kW 5068 kWh 3547 kWh 1520 kWh £952 £152 £1,104 £13,673 12.4 yrs £8,403
6 kW 6081 kWh 4257 kWh 1824 kWh £1,142 £182 £1,325 £15,707 11.9 yrs £10,783
7 kW 7095 kWh 4966 kWh 2128 kWh £1,332 £213 £1,545 £17,742 11.5 yrs £13,164
8 kW 8108 kWh 5676 kWh 2432 kWh £1,523 £243 £1,766 £19,776 11.2 yrs £15,544

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: £1,129, Upfront: £15,423, Break-even: 13.7 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2027 kWh 1480 kWh 547 kWh £397 £55 £452 £9,319 20.6 yrs £-284
3 kW 3041 kWh 2220 kWh 821 kWh £596 £82 £678 £11,354 16.8 yrs £2,199
4 kW 4054 kWh 2959 kWh 1095 kWh £794 £109 £903 £13,388 14.8 yrs £4,682
5 kW 5068 kWh 3699 kWh 1368 kWh £993 £137 £1,129 £15,423 13.7 yrs £7,164
6 kW 6081 kWh 4439 kWh 1642 kWh £1,191 £164 £1,355 £17,457 12.9 yrs £9,647
7 kW 7095 kWh 5179 kWh 1916 kWh £1,390 £192 £1,581 £19,492 12.3 yrs £12,130
8 kW 8108 kWh 5919 kWh 2189 kWh £1,588 £219 £1,807 £21,526 11.9 yrs £14,613

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: £1,146, Upfront: £17,173, Break-even: 15.0 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2027 kWh 1520 kWh 507 kWh £408 £51 £459 £11,069 24.1 yrs £-1,898
3 kW 3041 kWh 2280 kWh 760 kWh £612 £76 £688 £13,104 19.1 yrs £653
4 kW 4054 kWh 3041 kWh 1014 kWh £816 £101 £917 £15,138 16.5 yrs £3,204
5 kW 5068 kWh 3801 kWh 1267 kWh £1,020 £127 £1,146 £17,173 15.0 yrs £5,756
6 kW 6081 kWh 4561 kWh 1520 kWh £1,224 £152 £1,376 £19,207 14.0 yrs £8,307
7 kW 7095 kWh 5321 kWh 1774 kWh £1,428 £177 £1,605 £21,242 13.2 yrs £10,858
8 kW 8108 kWh 6081 kWh 2027 kWh £1,632 £203 £1,834 £23,276 12.7 yrs £13,409

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: £1,163, Upfront: £19,623, Break-even: 16.9 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2027 kWh 1561 kWh 466 kWh £419 £47 £465 £13,519 29.0 yrs £-4,211
3 kW 3041 kWh 2341 kWh 699 kWh £628 £70 £698 £15,554 22.3 yrs £-1,592
4 kW 4054 kWh 3122 kWh 932 kWh £838 £93 £931 £17,588 18.9 yrs £1,027
5 kW 5068 kWh 3902 kWh 1166 kWh £1,047 £117 £1,163 £19,623 16.9 yrs £3,647
6 kW 6081 kWh 4682 kWh 1399 kWh £1,256 £140 £1,396 £21,657 15.5 yrs £6,266
7 kW 7095 kWh 5463 kWh 1632 kWh £1,466 £163 £1,629 £23,692 14.5 yrs £8,885
8 kW 8108 kWh 6243 kWh 1865 kWh £1,675 £186 £1,862 £25,726 13.8 yrs £11,505

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 SA69

Figures below are tailored to SA69 — click through for full league tables.

Big-Roof Britain Rank #187 of 2182
6.2 kWp (UK avg 5.1 kWp)
~13 panels (≈430 W)
Solar Payback Index Rank #436 of 2997
10.4 years (UK avg 11.3 years)
~£1,171 /yr • £12,207 upfront
Standing-Charge Drag Rank #570 of 2997
16.1% (UK avg 21.7%) drag on savings
£189 fixed • ~£1,171 /yr value

Your Area at a Glance

Your Electricity Rate
26.83p/kWh
Daily Fixed Charge
51.69p/day
Local Sunshine
1014kWh/kW
A 1 kW system generates ~1014 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: 50% • Flats: 20% • Bungalows: 29% Based on 1,217 properties

Coverage

Pembrokeshire (100%)

Areas Covered

Saundersfoot South, Amroth and Saundersfoot North, East Williamston, St Florence and St Mary Out Liberty, Tenby: South

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

SA68 (Pembrokeshire)
≈3.7 km away
Local sunshine: ~1,014 kWh/kWp · +0% vs SA69
SA70 (Pembrokeshire)
≈4.4 km away
Local sunshine: ~995 kWh/kWp · -2% vs SA69
SA67 (Pembrokeshire)
≈9.9 km away
Local sunshine: ~972 kWh/kWp · -4% vs SA69
SA71 (Pembrokeshire)
≈15.3 km away
Local sunshine: ~1,039 kWh/kWp · +3% vs SA69
SA34 (Carmarthenshire)
≈15.7 km away
Local sunshine: ~995 kWh/kWp · -2% vs SA69
SA72 (Pembrokeshire)
≈16.5 km away
Local sunshine: ~1,040 kWh/kWp · +3% vs SA69

Similar sunshine across the UK

RM12 (Havering)
~1,014 kWh/kWp · -0% vs SA69
NR11 (North Norfolk)
~1,014 kWh/kWp · +0% vs SA69
LN11 (East Lindsey)
~1,013 kWh/kWp · -0% vs SA69