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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in SA68 (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
£1,018
What you save every year
Profit Over 25 Years
£13,249
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 — 46 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: £849, 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 2029 kWh 811 kWh 1217 kWh £218 £122 £339 £4,069 12.0 yrs £2,719
3 kW 3043 kWh 1217 kWh 1826 kWh £327 £183 £509 £6,104 12.0 yrs £4,079
4 kW 4057 kWh 1623 kWh 2434 kWh £435 £243 £679 £8,138 12.0 yrs £5,439
5 kW 5071 kWh 2029 kWh 3043 kWh £544 £304 £849 £10,173 12.0 yrs £6,798
6 kW 6086 kWh 2434 kWh 3651 kWh £653 £365 £1,018 £12,207 12.0 yrs £8,158
7 kW 7100 kWh 2840 kWh 4260 kWh £762 £426 £1,188 £14,242 12.0 yrs £9,518
8 kW 8114 kWh 3246 kWh 4868 kWh £871 £487 £1,358 £16,276 12.0 yrs £10,877

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: £1,019, 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 2029 kWh 1217 kWh 811 kWh £327 £81 £408 £6,169 15.1 yrs £1,985
3 kW 3043 kWh 1826 kWh 1217 kWh £490 £122 £612 £8,204 13.4 yrs £4,027
4 kW 4057 kWh 2434 kWh 1623 kWh £653 £162 £815 £10,238 12.6 yrs £6,070
5 kW 5071 kWh 3043 kWh 2029 kWh £816 £203 £1,019 £12,273 12.0 yrs £8,112
6 kW 6086 kWh 3651 kWh 2434 kWh £980 £243 £1,223 £14,307 11.7 yrs £10,155
7 kW 7100 kWh 4260 kWh 2840 kWh £1,143 £284 £1,427 £16,342 11.5 yrs £12,197
8 kW 8114 kWh 4868 kWh 3246 kWh £1,306 £325 £1,631 £18,376 11.3 yrs £14,240

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: £1,105, 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 2029 kWh 1420 kWh 609 kWh £381 £61 £442 £7,569 17.1 yrs £1,268
3 kW 3043 kWh 2130 kWh 913 kWh £571 £91 £663 £9,604 14.5 yrs £3,652
4 kW 4057 kWh 2840 kWh 1217 kWh £762 £122 £884 £11,638 13.2 yrs £6,035
5 kW 5071 kWh 3550 kWh 1521 kWh £952 £152 £1,105 £13,673 12.4 yrs £8,419
6 kW 6086 kWh 4260 kWh 1826 kWh £1,143 £183 £1,326 £15,707 11.8 yrs £10,803
7 kW 7100 kWh 4970 kWh 2130 kWh £1,333 £213 £1,546 £17,742 11.5 yrs £13,187
8 kW 8114 kWh 5680 kWh 2434 kWh £1,524 £243 £1,767 £19,776 11.2 yrs £15,571

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: £1,130, Upfront: £15,423, Break-even: 13.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2029 kWh 1481 kWh 548 kWh £397 £55 £452 £9,319 20.6 yrs £-277
3 kW 3043 kWh 2221 kWh 822 kWh £596 £82 £678 £11,354 16.7 yrs £2,209
4 kW 4057 kWh 2962 kWh 1095 kWh £795 £110 £904 £13,388 14.8 yrs £4,695
5 kW 5071 kWh 3702 kWh 1369 kWh £993 £137 £1,130 £15,423 13.6 yrs £7,181
6 kW 6086 kWh 4443 kWh 1643 kWh £1,192 £164 £1,356 £17,457 12.9 yrs £9,668
7 kW 7100 kWh 5183 kWh 1917 kWh £1,391 £192 £1,582 £19,492 12.3 yrs £12,154
8 kW 8114 kWh 5923 kWh 2191 kWh £1,589 £219 £1,808 £21,526 11.9 yrs £14,640

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: £1,147, 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 2029 kWh 1521 kWh 507 kWh £408 £51 £459 £11,069 24.1 yrs £-1,891
3 kW 3043 kWh 2282 kWh 761 kWh £612 £76 £688 £13,104 19.0 yrs £664
4 kW 4057 kWh 3043 kWh 1014 kWh £816 £101 £918 £15,138 16.5 yrs £3,218
5 kW 5071 kWh 3804 kWh 1268 kWh £1,020 £127 £1,147 £17,173 15.0 yrs £5,773
6 kW 6086 kWh 4564 kWh 1521 kWh £1,225 £152 £1,377 £19,207 14.0 yrs £8,327
7 kW 7100 kWh 5325 kWh 1775 kWh £1,429 £177 £1,606 £21,242 13.2 yrs £10,882
8 kW 8114 kWh 6086 kWh 2029 kWh £1,633 £203 £1,836 £23,276 12.7 yrs £13,436

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: £1,164, 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 2029 kWh 1562 kWh 467 kWh £419 £47 £466 £13,519 29.0 yrs £-4,204
3 kW 3043 kWh 2343 kWh 700 kWh £629 £70 £699 £15,554 22.3 yrs £-1,581
4 kW 4057 kWh 3124 kWh 933 kWh £838 £93 £931 £17,588 18.9 yrs £1,041
5 kW 5071 kWh 3905 kWh 1166 kWh £1,048 £117 £1,164 £19,623 16.9 yrs £3,664
6 kW 6086 kWh 4686 kWh 1400 kWh £1,257 £140 £1,397 £21,657 15.5 yrs £6,287
7 kW 7100 kWh 5467 kWh 1633 kWh £1,467 £163 £1,630 £23,692 14.5 yrs £8,910
8 kW 8114 kWh 6248 kWh 1866 kWh £1,676 £187 £1,863 £25,726 13.8 yrs £11,533

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 SA68

Figures below are tailored to SA68 — click through for full league tables.

Big-Roof Britain Rank #58 of 2182
7.0 kWp (UK avg 5.1 kWp)
~15 panels (≈430 W)
Solar Payback Index Rank #435 of 2997
10.4 years (UK avg 11.3 years)
~£1,172 /yr • £12,207 upfront
Standing-Charge Drag Rank #577 of 2997
16.1% (UK avg 21.7%) drag on savings
£189 fixed • ~£1,172 /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: 49% • Flats: 6% • Bungalows: 44% Based on 1,149 properties

Coverage

Pembrokeshire (100%)

Areas Covered

Kilgetty and Begelly, Carew and Jeffreyston, East Williamston, Martletwy, Narberth: Urban

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

SA69 (Pembrokeshire)
≈3.7 km away
Local sunshine: ~1,014 kWh/kWp · -0% vs SA68
SA70 (Pembrokeshire)
≈7.0 km away
Local sunshine: ~995 kWh/kWp · -2% vs SA68
SA67 (Pembrokeshire)
≈7.4 km away
Local sunshine: ~972 kWh/kWp · -4% vs SA68
SA71 (Pembrokeshire)
≈13.4 km away
Local sunshine: ~1,039 kWh/kWp · +2% vs SA68
SA72 (Pembrokeshire)
≈14.1 km away
Local sunshine: ~1,040 kWh/kWp · +3% vs SA68
SA34 (Carmarthenshire)
≈15.2 km away
Local sunshine: ~995 kWh/kWp · -2% vs SA68

Similar sunshine across the UK

RM5 (Havering)
~1,014 kWh/kWp · +0% vs SA68
DA17 (Bexley)
~1,014 kWh/kWp · +0% vs SA68
PE14 (King's Lynn and West Norfolk)
~1,014 kWh/kWp · -0% vs SA68