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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in SA73 (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
11.6 years
After this, it's pure profit
Upfront Cost
£12,207
What you pay to get started
Annual Benefit
£1,056
What you save every year
Profit Over 25 Years
£14,182
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 1051 kWh/kW — 83 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 1051 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)
1051 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: £880, Upfront: £10,173, Break-even: 11.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2103 kWh 841 kWh 1262 kWh £226 £126 £352 £4,069 11.6 yrs £2,968
3 kW 3154 kWh 1262 kWh 1893 kWh £339 £189 £528 £6,104 11.6 yrs £4,452
4 kW 4206 kWh 1682 kWh 2523 kWh £451 £252 £704 £8,138 11.6 yrs £5,936
5 kW 5257 kWh 2103 kWh 3154 kWh £564 £315 £880 £10,173 11.6 yrs £7,420
6 kW 6309 kWh 2523 kWh 3785 kWh £677 £379 £1,056 £12,207 11.6 yrs £8,904
7 kW 7360 kWh 2944 kWh 4416 kWh £790 £442 £1,231 £14,242 11.6 yrs £10,388
8 kW 8412 kWh 3365 kWh 5047 kWh £903 £505 £1,407 £16,276 11.6 yrs £11,872

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: £1,057, Upfront: £12,273, Break-even: 11.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2103 kWh 1262 kWh 841 kWh £339 £84 £423 £6,169 14.6 yrs £2,284
3 kW 3154 kWh 1893 kWh 1262 kWh £508 £126 £634 £8,204 12.9 yrs £4,476
4 kW 4206 kWh 2523 kWh 1682 kWh £677 £168 £845 £10,238 12.1 yrs £6,667
5 kW 5257 kWh 3154 kWh 2103 kWh £846 £210 £1,057 £12,273 11.6 yrs £8,859
6 kW 6309 kWh 3785 kWh 2523 kWh £1,016 £252 £1,268 £14,307 11.3 yrs £11,051
7 kW 7360 kWh 4416 kWh 2944 kWh £1,185 £294 £1,479 £16,342 11.0 yrs £13,243
8 kW 8412 kWh 5047 kWh 3365 kWh £1,354 £336 £1,691 £18,376 10.9 yrs £15,435

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: £1,145, Upfront: £13,673, Break-even: 11.9 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2103 kWh 1472 kWh 631 kWh £395 £63 £458 £7,569 16.5 yrs £1,592
3 kW 3154 kWh 2208 kWh 946 kWh £592 £95 £687 £9,604 14.0 yrs £4,137
4 kW 4206 kWh 2944 kWh 1262 kWh £790 £126 £916 £11,638 12.7 yrs £6,683
5 kW 5257 kWh 3680 kWh 1577 kWh £987 £158 £1,145 £13,673 11.9 yrs £9,229
6 kW 6309 kWh 4416 kWh 1893 kWh £1,185 £189 £1,374 £15,707 11.4 yrs £11,775
7 kW 7360 kWh 5152 kWh 2208 kWh £1,382 £221 £1,603 £17,742 11.1 yrs £14,320
8 kW 8412 kWh 5888 kWh 2523 kWh £1,580 £252 £1,832 £19,776 10.8 yrs £16,866

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: £1,172, Upfront: £15,423, 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 2103 kWh 1535 kWh 568 kWh £412 £57 £469 £9,319 19.9 yrs £54
3 kW 3154 kWh 2303 kWh 852 kWh £618 £85 £703 £11,354 16.2 yrs £2,706
4 kW 4206 kWh 3070 kWh 1136 kWh £824 £114 £937 £13,388 14.3 yrs £5,358
5 kW 5257 kWh 3838 kWh 1419 kWh £1,030 £142 £1,172 £15,423 13.2 yrs £8,010
6 kW 6309 kWh 4605 kWh 1703 kWh £1,236 £170 £1,406 £17,457 12.4 yrs £10,662
7 kW 7360 kWh 5373 kWh 1987 kWh £1,442 £199 £1,640 £19,492 11.9 yrs £13,314
8 kW 8412 kWh 6140 kWh 2271 kWh £1,647 £227 £1,875 £21,526 11.5 yrs £15,966

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: £1,189, Upfront: £17,173, Break-even: 14.4 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2103 kWh 1577 kWh 526 kWh £423 £53 £476 £11,069 23.3 yrs £-1,555
3 kW 3154 kWh 2366 kWh 789 kWh £635 £79 £714 £13,104 18.4 yrs £1,168
4 kW 4206 kWh 3154 kWh 1051 kWh £846 £105 £951 £15,138 15.9 yrs £3,891
5 kW 5257 kWh 3943 kWh 1314 kWh £1,058 £131 £1,189 £17,173 14.4 yrs £6,614
6 kW 6309 kWh 4731 kWh 1577 kWh £1,269 £158 £1,427 £19,207 13.5 yrs £9,336
7 kW 7360 kWh 5520 kWh 1840 kWh £1,481 £184 £1,665 £21,242 12.8 yrs £12,059
8 kW 8412 kWh 6309 kWh 2103 kWh £1,693 £210 £1,903 £23,276 12.2 yrs £14,782

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: £1,207, Upfront: £19,623, Break-even: 16.3 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2103 kWh 1619 kWh 484 kWh £434 £48 £483 £13,519 28.0 yrs £-3,863
3 kW 3154 kWh 2429 kWh 725 kWh £652 £73 £724 £15,554 21.5 yrs £-1,069
4 kW 4206 kWh 3238 kWh 967 kWh £869 £97 £966 £17,588 18.2 yrs £1,724
5 kW 5257 kWh 4048 kWh 1209 kWh £1,086 £121 £1,207 £19,623 16.3 yrs £4,518
6 kW 6309 kWh 4858 kWh 1451 kWh £1,303 £145 £1,448 £21,657 15.0 yrs £7,311
7 kW 7360 kWh 5667 kWh 1693 kWh £1,521 £169 £1,690 £23,692 14.0 yrs £10,105
8 kW 8412 kWh 6477 kWh 1935 kWh £1,738 £193 £1,931 £25,726 13.3 yrs £12,898

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 SA73

Figures below are tailored to SA73 — click through for full league tables.

Big-Roof Britain Rank #488 of 2182
5.6 kWp (UK avg 5.1 kWp)
~12 panels (≈430 W)
Solar Payback Index Rank #193 of 2997
10.0 years (UK avg 11.3 years)
~£1,215 /yr • £12,207 upfront
Standing-Charge Drag Rank #496 of 2997
15.5% (UK avg 21.7%) drag on savings
£189 fixed • ~£1,215 /yr value

Your Area at a Glance

Your Electricity Rate
26.83p/kWh
Daily Fixed Charge
51.69p/day
Local Sunshine
1051kWh/kW
A 1 kW system generates ~1051 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: 64% • Flats: 17% • Bungalows: 18% Based on 5,392 properties

Coverage

Pembrokeshire (100%)

Areas Covered

Milford: Central, Milford: Hakin, Neyland: West, Milford: North, Milford: West, Milford: Hubberston, Neyland: East, Milford: East + 3 more

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

SA72 (Pembrokeshire)
≈6.6 km away
Local sunshine: ~1,040 kWh/kWp · -1% vs SA73
SA71 (Pembrokeshire)
≈9.0 km away
Local sunshine: ~1,039 kWh/kWp · -1% vs SA73
SA61 (Pembrokeshire)
≈10.3 km away
Local sunshine: ~984 kWh/kWp · -6% vs SA73
SA62 (Pembrokeshire)
≈14.4 km away
Local sunshine: ~1,029 kWh/kWp · -2% vs SA73
SA68 (Pembrokeshire)
≈19.7 km away
Local sunshine: ~1,014 kWh/kWp · -4% vs SA73
SA63 (Pembrokeshire)
≈20.5 km away
Local sunshine: ~979 kWh/kWp · -7% vs SA73

Similar sunshine across the UK

IP16 (East Suffolk)
~1,051 kWh/kWp · +0% vs SA73
SO45 (New Forest)
~1,052 kWh/kWp · +0% vs SA73
TN19 (Rother)
~1,052 kWh/kWp · +0% vs SA73