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Solar panel cost in Rhondda Cynon Taf (CF39)

See realistic solar installation costs, savings and payback for CF39 (Rhondda Cynon Taf) 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
12.7 years
After this, it's pure profit
Upfront Cost
£8,138
What you pay to get started
Annual Benefit
£642
What you save every year
Profit Over 25 Years
£7,904
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 28.18p/kWh with a 52.75p/day standing charge. Your postcode’s south-facing sunshine yield is 929 kWh/kW — 40 below the regional median (968).

Read the full story

A typical roof here lands around 4.0 kW, with most eligible homes comfortably fitting within 3–6 kW. Each kilowatt of panels produces roughly 929 kWh per year on a south-facing roof. We value self-used electricity at 28.2p and exported surplus at a baseline 10p via SEG. Use the calculator above for your exact tariff.

Unit rate
28.2p/kWh
Standing charge
52.8p/day
Sunshine yield (south)
929 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: £802, Upfront: £10,173, Break-even: 12.7 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1858 kWh 743 kWh 1115 kWh £209 £111 £321 £4,069 12.7 yrs £2,348
3 kW 2786 kWh 1115 kWh 1672 kWh £314 £167 £481 £6,104 12.7 yrs £3,521
4 kW 3715 kWh 1486 kWh 2229 kWh £419 £223 £642 £8,138 12.7 yrs £4,695
5 kW 4644 kWh 1858 kWh 2786 kWh £523 £279 £802 £10,173 12.7 yrs £5,869
6 kW 5573 kWh 2229 kWh 3344 kWh £628 £334 £963 £12,207 12.7 yrs £7,043
7 kW 6501 kWh 2601 kWh 3901 kWh £733 £390 £1,123 £14,242 12.7 yrs £8,217
8 kW 7430 kWh 2972 kWh 4458 kWh £838 £446 £1,283 £16,276 12.7 yrs £9,391

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: £971, Upfront: £12,273, Break-even: 12.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1858 kWh 1115 kWh 743 kWh £314 £74 £388 £6,169 15.9 yrs £1,598
3 kW 2786 kWh 1672 kWh 1115 kWh £471 £111 £583 £8,204 14.1 yrs £3,448
4 kW 3715 kWh 2229 kWh 1486 kWh £628 £149 £777 £10,238 13.2 yrs £5,297
5 kW 4644 kWh 2786 kWh 1858 kWh £785 £186 £971 £12,273 12.6 yrs £7,146
6 kW 5573 kWh 3344 kWh 2229 kWh £942 £223 £1,165 £14,307 12.3 yrs £8,995
7 kW 6501 kWh 3901 kWh 2601 kWh £1,099 £260 £1,359 £16,342 12.0 yrs £10,845
8 kW 7430 kWh 4458 kWh 2972 kWh £1,256 £297 £1,553 £18,376 11.8 yrs £12,694

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: £1,055, Upfront: £13,673, Break-even: 13.0 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1858 kWh 1300 kWh 557 kWh £366 £56 £422 £7,569 17.9 yrs £874
3 kW 2786 kWh 1950 kWh 836 kWh £550 £84 £633 £9,604 15.2 yrs £3,061
4 kW 3715 kWh 2601 kWh 1115 kWh £733 £111 £844 £11,638 13.8 yrs £5,248
5 kW 4644 kWh 3251 kWh 1393 kWh £916 £139 £1,055 £13,673 13.0 yrs £7,435
6 kW 5573 kWh 3901 kWh 1672 kWh £1,099 £167 £1,266 £15,707 12.4 yrs £9,622
7 kW 6501 kWh 4551 kWh 1950 kWh £1,282 £195 £1,478 £17,742 12.0 yrs £11,809
8 kW 7430 kWh 5201 kWh 2229 kWh £1,466 £223 £1,689 £19,776 11.7 yrs £13,995

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: £1,081, Upfront: £15,423, Break-even: 14.3 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1858 kWh 1356 kWh 502 kWh £382 £50 £432 £9,319 21.6 yrs £-674
3 kW 2786 kWh 2034 kWh 752 kWh £573 £75 £648 £11,354 17.5 yrs £1,615
4 kW 3715 kWh 2712 kWh 1003 kWh £764 £100 £865 £13,388 15.5 yrs £3,903
5 kW 4644 kWh 3390 kWh 1254 kWh £955 £125 £1,081 £15,423 14.3 yrs £6,191
6 kW 5573 kWh 4068 kWh 1505 kWh £1,146 £150 £1,297 £17,457 13.5 yrs £8,479
7 kW 6501 kWh 4746 kWh 1755 kWh £1,337 £176 £1,513 £19,492 12.9 yrs £10,768
8 kW 7430 kWh 5424 kWh 2006 kWh £1,528 £201 £1,729 £21,526 12.4 yrs £13,056

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: £1,098, Upfront: £17,173, Break-even: 15.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1858 kWh 1393 kWh 464 kWh £393 £46 £439 £11,069 25.2 yrs £-2,288
3 kW 2786 kWh 2090 kWh 697 kWh £589 £70 £659 £13,104 19.9 yrs £67
4 kW 3715 kWh 2786 kWh 929 kWh £785 £93 £878 £15,138 17.2 yrs £2,423
5 kW 4644 kWh 3483 kWh 1161 kWh £981 £116 £1,098 £17,173 15.6 yrs £4,779
6 kW 5573 kWh 4179 kWh 1393 kWh £1,178 £139 £1,317 £19,207 14.6 yrs £7,135
7 kW 6501 kWh 4876 kWh 1625 kWh £1,374 £163 £1,537 £21,242 13.8 yrs £9,491
8 kW 7430 kWh 5573 kWh 1858 kWh £1,570 £186 £1,756 £23,276 13.3 yrs £11,846

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: £1,114, Upfront: £19,623, Break-even: 17.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1858 kWh 1430 kWh 427 kWh £403 £43 £446 £13,519 30.3 yrs £-4,603
3 kW 2786 kWh 2145 kWh 641 kWh £605 £64 £669 £15,554 23.3 yrs £-2,180
4 kW 3715 kWh 2861 kWh 854 kWh £806 £85 £892 £17,588 19.7 yrs £243
5 kW 4644 kWh 3576 kWh 1068 kWh £1,008 £107 £1,114 £19,623 17.6 yrs £2,667
6 kW 5573 kWh 4291 kWh 1282 kWh £1,209 £128 £1,337 £21,657 16.2 yrs £5,090
7 kW 6501 kWh 5006 kWh 1495 kWh £1,411 £150 £1,560 £23,692 15.2 yrs £7,513
8 kW 7430 kWh 5721 kWh 1709 kWh £1,612 £171 £1,783 £25,726 14.4 yrs £9,937

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 CF39

Figures below are tailored to CF39 — click through for full league tables.

Big-Roof Britain Rank #1552 of 2182
4.6 kWp (UK avg 5.1 kWp)
~10 panels (≈430 W)
Solar Payback Index Rank #1686 of 2997
12.7 years (UK avg 12.6 years)
~£642 /yr • £8,138 upfront
Standing-Charge Drag Rank #2401 of 2997
30.0% (UK avg 24.6%) drag on savings
£193 fixed • ~£642 /yr value
Aspect Penalty View ranking →
East −19.3% West −19.5%
Typical output loss versus a south-facing roof (lower is better)

Your Area at a Glance

Your Electricity Rate
28.18p/kWh
Daily Fixed Charge
52.75p/day
Local Sunshine
929kWh/kW
A 1 kW system generates ~929 kWh per year. A typical home uses ~2,700 kWh per year.
Typical System Size
4.0kW
For houses & bungalows in this area

Local Property Data

Property Types

Houses: 82% • Flats: 15% • Bungalows: 3% Based on 7,238 properties

Coverage

Rhondda Cynon Taf (98%)|Bridgend (2%)

Areas Covered

Porth, Tonyrefail East, Cymer, Tonyrefail West, Tylorstown and Ynyshir, Gilfach-goch, Cwm Clydach, Blackmill + 2 more

Data Sources & Assumptions

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

Electricity rates: Ofgem price cap, Q1 2026

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

CF40 (Rhondda Cynon Taf)
≈2.9 km away
Local sunshine: ~933 kWh/kWp · +0% vs CF39
CF37 (Rhondda Cynon Taf)
≈5.5 km away
Local sunshine: ~940 kWh/kWp · +1% vs CF39
CF43 (Rhondda Cynon Taf)
≈6.3 km away
Local sunshine: ~921 kWh/kWp · -1% vs CF39
CF41 (Rhondda Cynon Taf)
≈6.6 km away
Local sunshine: ~927 kWh/kWp · -0% vs CF39
CF38 (Rhondda Cynon Taf)
≈7.8 km away
Local sunshine: ~969 kWh/kWp · +4% vs CF39
CF45 (Rhondda Cynon Taf)
≈8.4 km away
Local sunshine: ~898 kWh/kWp · -3% vs CF39

Similar sunshine across the UK

S12 (Sheffield)
~929 kWh/kWp · +0% vs CF39
NE3 (Newcastle upon Tyne)
~929 kWh/kWp · +0% vs CF39
WS11 (Cannock Chase)
~929 kWh/kWp · +0% vs CF39