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Solar panel cost in Swansea (SA2)

See realistic solar installation costs, savings and payback for SA2 (Swansea) in under a minute using official UK data. Start with the calculator, then get a no-obligation quote from an MCS-certified installer. You can also ask the SolarByPostcode assistant to sanity-check your roof, bills and plans.

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
10.0 years
After this, it's pure profit
Upfront Cost
£9,767
What you pay to get started
Annual Benefit
£980
What you save every year
Profit Over 25 Years
£14,741
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: The official cost per kW is lower above 4 kW, so a 5–6 kW system can pay back a little faster than a 3–4 kW system on otherwise identical assumptions.
  • 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

Panel costs: Uses March 2026 TIC mean installation costs: £1,827/kW up to 4 kW and £1,628/kW above 4 kW.

Other costs: Battery prices are modelled at £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 26.33p/kWh with a 57.84p/day standing charge. Your postcode’s south-facing sunshine yield is 988 kWh/kW — 20 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 988 kWh per year on a south-facing roof. We value self-used electricity at 26.3p and exported surplus at a baseline 10p via SEG. Use the calculator above for your exact tariff.

Unit rate
26.3p/kWh
Standing charge
57.8p/day
Sunshine yield (south)
988 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: £817, Upfront: £8,139, Break-even: 10.0 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1977 kWh 791 kWh 1186 kWh £208 £119 £327 £3,256 10.0 yrs £3,280
3 kW 2965 kWh 1186 kWh 1779 kWh £312 £178 £490 £4,883 10.0 yrs £4,920
4 kW 3953 kWh 1581 kWh 2372 kWh £416 £237 £654 £6,511 10.0 yrs £6,560
5 kW 4942 kWh 1977 kWh 2965 kWh £520 £296 £817 £8,139 10.0 yrs £8,200
6 kW 5930 kWh 2372 kWh 3558 kWh £625 £356 £980 £9,767 10.0 yrs £9,840
7 kW 6918 kWh 2767 kWh 4151 kWh £729 £415 £1,144 £11,394 10.0 yrs £11,480
8 kW 7906 kWh 3163 kWh 4744 kWh £833 £474 £1,307 £13,022 10.0 yrs £13,120

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,628, battery £/kWh = 700.

3 kWh battery 5 kW example → Annual benefit: £978, Upfront: £10,239, Break-even: 10.5 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1977 kWh 1186 kWh 791 kWh £312 £79 £391 £5,356 13.7 yrs £2,471
3 kW 2965 kWh 1779 kWh 1186 kWh £468 £119 £587 £6,983 11.9 yrs £4,757
4 kW 3953 kWh 2372 kWh 1581 kWh £625 £158 £783 £8,611 11.0 yrs £7,042
5 kW 4942 kWh 2965 kWh 1977 kWh £781 £198 £978 £10,239 10.5 yrs £9,328
6 kW 5930 kWh 3558 kWh 2372 kWh £937 £237 £1,174 £11,867 10.1 yrs £11,613
7 kW 6918 kWh 4151 kWh 2767 kWh £1,093 £277 £1,370 £13,494 9.9 yrs £13,899
8 kW 7906 kWh 4744 kWh 3163 kWh £1,249 £316 £1,565 £15,122 9.7 yrs £16,184

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,628, battery £/kWh = 700.

5 kWh battery 5 kW example → Annual benefit: £1,059, Upfront: £11,639, Break-even: 11.0 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1977 kWh 1384 kWh 593 kWh £364 £59 £424 £6,756 15.9 yrs £1,717
3 kW 2965 kWh 2075 kWh 889 kWh £546 £89 £635 £8,383 13.2 yrs £4,325
4 kW 3953 kWh 2767 kWh 1186 kWh £729 £119 £847 £10,011 11.8 yrs £6,933
5 kW 4942 kWh 3459 kWh 1482 kWh £911 £148 £1,059 £11,639 11.0 yrs £9,541
6 kW 5930 kWh 4151 kWh 1779 kWh £1,093 £178 £1,271 £13,267 10.4 yrs £12,150
7 kW 6918 kWh 4843 kWh 2075 kWh £1,275 £208 £1,483 £14,894 10.0 yrs £14,758
8 kW 7906 kWh 5534 kWh 2372 kWh £1,457 £237 £1,694 £16,522 9.8 yrs £17,366

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,628, battery £/kWh = 700.

7.5 kWh battery 5 kW example → Annual benefit: £1,083, Upfront: £13,389, 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 1977 kWh 1443 kWh 534 kWh £380 £53 £433 £8,506 19.6 yrs £160
3 kW 2965 kWh 2164 kWh 801 kWh £570 £80 £650 £10,133 15.6 yrs £2,865
4 kW 3953 kWh 2886 kWh 1067 kWh £760 £107 £867 £11,761 13.6 yrs £5,571
5 kW 4942 kWh 3607 kWh 1334 kWh £950 £133 £1,083 £13,389 12.4 yrs £8,276
6 kW 5930 kWh 4329 kWh 1601 kWh £1,140 £160 £1,300 £15,017 11.6 yrs £10,981
7 kW 6918 kWh 5050 kWh 1868 kWh £1,330 £187 £1,517 £16,644 11.0 yrs £13,686
8 kW 7906 kWh 5772 kWh 2135 kWh £1,520 £213 £1,733 £18,272 10.5 yrs £16,391

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,628, battery £/kWh = 700.

10 kWh battery 5 kW example → Annual benefit: £1,099, Upfront: £15,139, Break-even: 13.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1977 kWh 1482 kWh 494 kWh £390 £49 £440 £10,256 23.3 yrs £-1,461
3 kW 2965 kWh 2224 kWh 741 kWh £585 £74 £660 £11,883 18.0 yrs £1,309
4 kW 3953 kWh 2965 kWh 988 kWh £781 £99 £879 £13,511 15.4 yrs £4,079
5 kW 4942 kWh 3706 kWh 1235 kWh £976 £124 £1,099 £15,139 13.8 yrs £6,848
6 kW 5930 kWh 4447 kWh 1482 kWh £1,171 £148 £1,319 £16,767 12.7 yrs £9,618
7 kW 6918 kWh 5189 kWh 1730 kWh £1,366 £173 £1,539 £18,394 12.0 yrs £12,388
8 kW 7906 kWh 5930 kWh 1977 kWh £1,561 £198 £1,759 £20,022 11.4 yrs £15,157

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,628, battery £/kWh = 700.

13.5 kWh battery 5 kW example → Annual benefit: £1,115, Upfront: £17,589, Break-even: 15.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1977 kWh 1522 kWh 455 kWh £401 £45 £446 £12,706 28.5 yrs £-3,782
3 kW 2965 kWh 2283 kWh 682 kWh £601 £68 £669 £14,333 21.4 yrs £-947
4 kW 3953 kWh 3044 kWh 909 kWh £801 £91 £892 £15,961 17.9 yrs £1,887
5 kW 4942 kWh 3805 kWh 1137 kWh £1,002 £114 £1,115 £17,589 15.8 yrs £4,721
6 kW 5930 kWh 4566 kWh 1364 kWh £1,202 £136 £1,339 £19,217 14.4 yrs £7,555
7 kW 6918 kWh 5327 kWh 1591 kWh £1,403 £159 £1,562 £20,844 13.3 yrs £10,390
8 kW 7906 kWh 6088 kWh 1818 kWh £1,603 £182 £1,785 £22,472 12.6 yrs £13,224

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,628, 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.

Before you request quotes in Swansea

Use the numbers above to sanity-check installer quotes. The main things to compare are system size, battery assumptions, payback claims, MCS certification, DNO paperwork and export assumptions.

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Understand DNO, G98 and G99 export limits

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Insights for SA2

Figures below are tailored to SA2 — click through for full league tables.

Big-Roof Britain Rank #606 of 2182
5.5 kWp (UK avg 5.1 kWp)
~11 panels (≈430 W)
Solar Payback Index Rank #1155 of 2996
10.0 years (UK avg 10.8 years)
~£980 /yr • £9,767 upfront
Standing-Charge Drag Rank #799 of 2996
21.5% (UK avg 26.6%) drag on savings
£211 fixed • ~£980 /yr value
Aspect Penalty View ranking →
East −19.9% West −21.0%
Typical output loss versus a south-facing roof (lower is better)

Seasonal solar output in SA2

Monthly generation per kilowatt of solar panels

kWh 36 Jan 52 Feb 86 Mar 115 Apr 125 May 123 Jun 119 Jul 107 Aug 90 Sep 62 Oct 42 Nov 31 Dec
Best month Worst month Winter (Dec–Feb) Other months

Winter output: 48.3% of an average month (Dec–Feb)

Best / worst month: May / Dec

These figures show output per kilowatt (kW) of panels installed. In winter, a 1 kW system here produces about 40 kWh per month; the average month produces around 82 kWh. So a typical 4 kW home system would generate roughly 159 kWh in winter, or 329 kWh in an average month.

Your Area at a Glance

Your Electricity Rate
26.33p/kWh
Daily Fixed Charge
57.84p/day
Local Sunshine
988kWh/kW
A 1 kW system generates ~988 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: 70% • Flats: 23% • Bungalows: 6% Based on 8,213 properties

Coverage

Swansea (100%)

Areas Covered

Sketty, Uplands, Dunvant and Killay, Llansamlet, Fairwood, Cockett, Townhill, Pennard + 3 more

Data Sources & Assumptions

Solar yield: PVGIS (EU Joint Research Centre), January 2025 data

Electricity rates: Ofgem price cap, Q3 2026

Installation costs: DESNZ/MCS data, March 2026 (TIC)

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

SA5 (Swansea)
≈3.3 km away
Local sunshine: ~989 kWh/kWp · +0% vs SA2
SA1 (Swansea)
≈3.5 km away
Local sunshine: ~982 kWh/kWp · -1% vs SA2
SA3 (Swansea)
≈5.0 km away
Local sunshine: ~1,044 kWh/kWp · +6% vs SA2
SA80 (Swansea)
≈5.6 km away
Local sunshine: ~982 kWh/kWp · -1% vs SA2
SA99 (Swansea)
≈6.4 km away
Local sunshine: ~968 kWh/kWp · -2% vs SA2
SA4 (Swansea)
≈6.4 km away
Local sunshine: ~961 kWh/kWp · -3% vs SA2

Similar sunshine across the UK

OX27 (Cherwell)
~988 kWh/kWp · -0% vs SA2
N7 (Islington)
~988 kWh/kWp · +0% vs SA2
NW5 (Camden)
~988 kWh/kWp · -0% vs SA2