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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in SA72 (Pembrokeshire)

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

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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
11.7 years
After this, it's pure profit
Upfront Cost
£12,207
What you pay to get started
Annual Benefit
£1,044
What you save every year
Profit Over 25 Years
£13,887
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 1040 kWh/kW — 71 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 1040 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)
1040 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: £870, Upfront: £10,173, Break-even: 11.7 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2079 kWh 832 kWh 1248 kWh £223 £125 £348 £4,069 11.7 yrs £2,889
3 kW 3119 kWh 1248 kWh 1871 kWh £335 £187 £522 £6,104 11.7 yrs £4,334
4 kW 4159 kWh 1663 kWh 2495 kWh £446 £250 £696 £8,138 11.7 yrs £5,779
5 kW 5198 kWh 2079 kWh 3119 kWh £558 £312 £870 £10,173 11.7 yrs £7,223
6 kW 6238 kWh 2495 kWh 3743 kWh £669 £374 £1,044 £12,207 11.7 yrs £8,668
7 kW 7278 kWh 2911 kWh 4367 kWh £781 £437 £1,218 £14,242 11.7 yrs £10,113
8 kW 8317 kWh 3327 kWh 4990 kWh £893 £499 £1,392 £16,276 11.7 yrs £11,557

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: £1,045, Upfront: £12,273, Break-even: 11.7 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2079 kWh 1248 kWh 832 kWh £335 £83 £418 £6,169 14.8 yrs £2,189
3 kW 3119 kWh 1871 kWh 1248 kWh £502 £125 £627 £8,204 13.1 yrs £4,334
4 kW 4159 kWh 2495 kWh 1663 kWh £669 £166 £836 £10,238 12.2 yrs £6,478
5 kW 5198 kWh 3119 kWh 2079 kWh £837 £208 £1,045 £12,273 11.7 yrs £8,623
6 kW 6238 kWh 3743 kWh 2495 kWh £1,004 £250 £1,254 £14,307 11.4 yrs £10,768
7 kW 7278 kWh 4367 kWh 2911 kWh £1,172 £291 £1,463 £16,342 11.2 yrs £12,912
8 kW 8317 kWh 4990 kWh 3327 kWh £1,339 £333 £1,672 £18,376 11.0 yrs £15,057

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: £1,132, Upfront: £13,673, Break-even: 12.1 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2079 kWh 1456 kWh 624 kWh £391 £62 £453 £7,569 16.7 yrs £1,489
3 kW 3119 kWh 2183 kWh 936 kWh £586 £94 £679 £9,604 14.1 yrs £3,984
4 kW 4159 kWh 2911 kWh 1248 kWh £781 £125 £906 £11,638 12.8 yrs £6,478
5 kW 5198 kWh 3639 kWh 1560 kWh £976 £156 £1,132 £13,673 12.1 yrs £8,973
6 kW 6238 kWh 4367 kWh 1871 kWh £1,172 £187 £1,359 £15,707 11.6 yrs £11,467
7 kW 7278 kWh 5094 kWh 2183 kWh £1,367 £218 £1,585 £17,742 11.2 yrs £13,962
8 kW 8317 kWh 5822 kWh 2495 kWh £1,562 £250 £1,812 £19,776 10.9 yrs £16,456

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: £1,159, Upfront: £15,423, Break-even: 13.3 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2079 kWh 1518 kWh 561 kWh £407 £56 £463 £9,319 20.1 yrs £-51
3 kW 3119 kWh 2277 kWh 842 kWh £611 £84 £695 £11,354 16.3 yrs £2,549
4 kW 4159 kWh 3036 kWh 1123 kWh £815 £112 £927 £13,388 14.4 yrs £5,148
5 kW 5198 kWh 3795 kWh 1404 kWh £1,018 £140 £1,159 £15,423 13.3 yrs £7,748
6 kW 6238 kWh 4554 kWh 1684 kWh £1,222 £168 £1,390 £17,457 12.6 yrs £10,347
7 kW 7278 kWh 5313 kWh 1965 kWh £1,425 £196 £1,622 £19,492 12.0 yrs £12,947
8 kW 8317 kWh 6072 kWh 2246 kWh £1,629 £225 £1,854 £21,526 11.6 yrs £15,546

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: £1,176, Upfront: £17,173, 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 2079 kWh 1560 kWh 520 kWh £418 £52 £470 £11,069 23.5 yrs £-1,661
3 kW 3119 kWh 2339 kWh 780 kWh £628 £78 £706 £13,104 18.6 yrs £1,009
4 kW 4159 kWh 3119 kWh 1040 kWh £837 £104 £941 £15,138 16.1 yrs £3,678
5 kW 5198 kWh 3899 kWh 1300 kWh £1,046 £130 £1,176 £17,173 14.6 yrs £6,348
6 kW 6238 kWh 4679 kWh 1560 kWh £1,255 £156 £1,411 £19,207 13.6 yrs £9,017
7 kW 7278 kWh 5458 kWh 1819 kWh £1,464 £182 £1,646 £21,242 12.9 yrs £11,687
8 kW 8317 kWh 6238 kWh 2079 kWh £1,674 £208 £1,882 £23,276 12.4 yrs £14,356

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: £1,194, Upfront: £19,623, Break-even: 16.4 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2079 kWh 1601 kWh 478 kWh £430 £48 £477 £13,519 28.3 yrs £-3,971
3 kW 3119 kWh 2402 kWh 717 kWh £644 £72 £716 £15,554 21.7 yrs £-1,231
4 kW 4159 kWh 3202 kWh 957 kWh £859 £96 £955 £17,588 18.4 yrs £1,508
5 kW 5198 kWh 4003 kWh 1196 kWh £1,074 £120 £1,194 £19,623 16.4 yrs £4,248
6 kW 6238 kWh 4803 kWh 1435 kWh £1,289 £143 £1,432 £21,657 15.1 yrs £6,987
7 kW 7278 kWh 5604 kWh 1674 kWh £1,504 £167 £1,671 £23,692 14.2 yrs £9,727
8 kW 8317 kWh 6404 kWh 1913 kWh £1,718 £191 £1,910 £25,726 13.5 yrs £12,466

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 SA72

Figures below are tailored to SA72 — click through for full league tables.

Big-Roof Britain Rank #599 of 2182
5.5 kWp (UK avg 5.1 kWp)
~12 panels (≈430 W)
Solar Payback Index Rank #286 of 2997
10.2 years (UK avg 11.3 years)
~£1,201 /yr • £12,207 upfront
Standing-Charge Drag Rank #519 of 2997
15.7% (UK avg 21.7%) drag on savings
£189 fixed • ~£1,201 /yr value

Your Area at a Glance

Your Electricity Rate
26.83p/kWh
Daily Fixed Charge
51.69p/day
Local Sunshine
1040kWh/kW
A 1 kW system generates ~1040 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: 58% • Flats: 23% • Bungalows: 17% Based on 3,025 properties

Coverage

Pembrokeshire (100%)

Areas Covered

Pembroke Dock: Central, Pembroke Dock: Market, Pembroke Dock: Bush, Pembroke Dock: Pennar, Pembroke Dock: Bufferland, Lamphey, Carew and Jeffreyston, Pembroke: St Michael

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

SA71 (Pembrokeshire)
≈2.6 km away
Local sunshine: ~1,039 kWh/kWp · -0% vs SA72
SA73 (Pembrokeshire)
≈6.6 km away
Local sunshine: ~1,051 kWh/kWp · +1% vs SA72
SA61 (Pembrokeshire)
≈12.1 km away
Local sunshine: ~984 kWh/kWp · -5% vs SA72
SA68 (Pembrokeshire)
≈14.1 km away
Local sunshine: ~1,014 kWh/kWp · -2% vs SA72
SA70 (Pembrokeshire)
≈16.0 km away
Local sunshine: ~995 kWh/kWp · -4% vs SA72
SA69 (Pembrokeshire)
≈16.5 km away
Local sunshine: ~1,014 kWh/kWp · -3% vs SA72

Similar sunshine across the UK

CM99 (Chelmsford)
~1,039 kWh/kWp · -0% vs SA72
ME4 (Medway)
~1,040 kWh/kWp · +0% vs SA72
SS14 (Basildon)
~1,039 kWh/kWp · -0% vs SA72