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Solar panel cost in Merthyr Tydfil (CF47)

See realistic solar installation costs, savings and payback for CF47 (Merthyr Tydfil) 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
12.1 years
After this, it's pure profit
Upfront Cost
£7,307
What you pay to get started
Annual Benefit
£605
What you save every year
Profit Over 25 Years
£7,817
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 915 kWh/kW — 54 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 915 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)
915 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: £756, Upfront: £9,134, 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 1830 kWh 732 kWh 1098 kWh £193 £110 £302 £3,654 12.1 yrs £2,396
3 kW 2745 kWh 1098 kWh 1647 kWh £289 £165 £454 £5,481 12.1 yrs £3,594
4 kW 3659 kWh 1464 kWh 2196 kWh £385 £220 £605 £7,307 12.1 yrs £4,792
5 kW 4574 kWh 1830 kWh 2745 kWh £482 £274 £756 £9,134 12.1 yrs £5,990
6 kW 5489 kWh 2196 kWh 3293 kWh £578 £329 £907 £10,961 12.1 yrs £7,188
7 kW 6404 kWh 2562 kWh 3842 kWh £674 £384 £1,059 £12,788 12.1 yrs £8,386
8 kW 7319 kWh 2927 kWh 4391 kWh £771 £439 £1,210 £14,615 12.1 yrs £9,584

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,827, battery £/kWh = 700.

3 kWh battery 5 kW example → Annual benefit: £906, Upfront: £11,234, 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 1830 kWh 1098 kWh 732 kWh £289 £73 £362 £5,754 15.9 yrs £1,491
3 kW 2745 kWh 1647 kWh 1098 kWh £434 £110 £543 £7,581 14.0 yrs £3,287
4 kW 3659 kWh 2196 kWh 1464 kWh £578 £146 £724 £9,407 13.0 yrs £5,082
5 kW 4574 kWh 2745 kWh 1830 kWh £723 £183 £906 £11,234 12.4 yrs £6,878
6 kW 5489 kWh 3293 kWh 2196 kWh £867 £220 £1,087 £13,061 12.0 yrs £8,673
7 kW 6404 kWh 3842 kWh 2562 kWh £1,012 £256 £1,268 £14,888 11.7 yrs £10,469
8 kW 7319 kWh 4391 kWh 2927 kWh £1,156 £293 £1,449 £16,715 11.5 yrs £12,264

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,827, battery £/kWh = 700.

5 kWh battery 5 kW example → Annual benefit: £980, Upfront: £12,634, Break-even: 12.9 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1830 kWh 1281 kWh 549 kWh £337 £55 £392 £7,154 18.2 yrs £689
3 kW 2745 kWh 1921 kWh 823 kWh £506 £82 £588 £8,981 15.3 yrs £2,783
4 kW 3659 kWh 2562 kWh 1098 kWh £674 £110 £784 £10,807 13.8 yrs £4,877
5 kW 4574 kWh 3202 kWh 1372 kWh £843 £137 £980 £12,634 12.9 yrs £6,972
6 kW 5489 kWh 3842 kWh 1647 kWh £1,012 £165 £1,176 £14,461 12.3 yrs £9,066
7 kW 6404 kWh 4483 kWh 1921 kWh £1,180 £192 £1,372 £16,288 11.9 yrs £11,160
8 kW 7319 kWh 5123 kWh 2196 kWh £1,349 £220 £1,568 £18,115 11.5 yrs £13,255

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,827, battery £/kWh = 700.

7.5 kWh battery 5 kW example → Annual benefit: £1,003, Upfront: £14,384, 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 1830 kWh 1336 kWh 494 kWh £352 £49 £401 £8,904 22.2 yrs £-882
3 kW 2745 kWh 2003 kWh 741 kWh £528 £74 £602 £10,731 17.8 yrs £1,302
4 kW 3659 kWh 2671 kWh 988 kWh £703 £99 £802 £12,557 15.7 yrs £3,486
5 kW 4574 kWh 3339 kWh 1235 kWh £879 £124 £1,003 £14,384 14.3 yrs £5,670
6 kW 5489 kWh 4007 kWh 1482 kWh £1,055 £148 £1,203 £16,211 13.5 yrs £7,854
7 kW 6404 kWh 4675 kWh 1729 kWh £1,231 £173 £1,404 £18,038 12.8 yrs £10,038
8 kW 7319 kWh 5343 kWh 1976 kWh £1,407 £198 £1,604 £19,865 12.4 yrs £12,222

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,827, battery £/kWh = 700.

10 kWh battery 5 kW example → Annual benefit: £1,018, Upfront: £16,134, Break-even: 15.9 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1830 kWh 1372 kWh 457 kWh £361 £46 £407 £10,654 26.2 yrs £-2,513
3 kW 2745 kWh 2058 kWh 686 kWh £542 £69 £611 £12,481 20.4 yrs £-269
4 kW 3659 kWh 2745 kWh 915 kWh £723 £91 £814 £14,307 17.6 yrs £1,975
5 kW 4574 kWh 3431 kWh 1144 kWh £903 £114 £1,018 £16,134 15.9 yrs £4,219
6 kW 5489 kWh 4117 kWh 1372 kWh £1,084 £137 £1,221 £17,961 14.7 yrs £6,462
7 kW 6404 kWh 4803 kWh 1601 kWh £1,265 £160 £1,425 £19,788 13.9 yrs £8,706
8 kW 7319 kWh 5489 kWh 1830 kWh £1,445 £183 £1,628 £21,615 13.3 yrs £10,950

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,827, battery £/kWh = 700.

13.5 kWh battery 5 kW example → Annual benefit: £1,033, Upfront: £18,584, Break-even: 18.0 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1830 kWh 1409 kWh 421 kWh £371 £42 £413 £13,104 31.7 yrs £-4,843
3 kW 2745 kWh 2113 kWh 631 kWh £556 £63 £620 £14,931 24.1 yrs £-2,540
4 kW 3659 kWh 2818 kWh 842 kWh £742 £84 £826 £16,757 20.3 yrs £-236
5 kW 4574 kWh 3522 kWh 1052 kWh £927 £105 £1,033 £18,584 18.0 yrs £2,067
6 kW 5489 kWh 4227 kWh 1262 kWh £1,113 £126 £1,239 £20,411 16.5 yrs £4,371
7 kW 6404 kWh 4931 kWh 1473 kWh £1,298 £147 £1,446 £22,238 15.4 yrs £6,674
8 kW 7319 kWh 5635 kWh 1683 kWh £1,484 £168 £1,652 £24,065 14.6 yrs £8,978

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,827, 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 Merthyr Tydfil

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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Insights for CF47

Figures below are tailored to CF47 — click through for full league tables.

Big-Roof Britain Rank #1531 of 2182
4.7 kWp (UK avg 5.1 kWp)
~10 panels (≈430 W)
Solar Payback Index Rank #2563 of 2996
12.1 years (UK avg 10.8 years)
~£605 /yr • £7,307 upfront
Standing-Charge Drag Rank #2584 of 2996
34.9% (UK avg 26.6%) drag on savings
£211 fixed • ~£605 /yr value
Aspect Penalty View ranking →
East −18.8% West −19.0%
Typical output loss versus a south-facing roof (lower is better)

Seasonal solar output in CF47

Monthly generation per kilowatt of solar panels

kWh 33 Jan 47 Feb 81 Mar 107 Apr 116 May 112 Jun 112 Jul 99 Aug 85 Sep 56 Oct 38 Nov 29 Dec
Best month Worst month Winter (Dec–Feb) Other months

Winter output: 47.1% 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 36 kWh per month; the average month produces around 76 kWh. So a typical 4 kW home system would generate roughly 144 kWh in winter, or 305 kWh in an average month.

Your Area at a Glance

Your Electricity Rate
26.33p/kWh
Daily Fixed Charge
57.84p/day
Local Sunshine
915kWh/kW
A 1 kW system generates ~915 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: 83% • Flats: 11% • Bungalows: 4% Based on 7,438 properties

Coverage

Merthyr Tydfil (100%)

Areas Covered

Town, Park, Penydarren, Gurnos, Cyfarthfa, Dowlais and Pant

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

CF48 (Merthyr Tydfil)
≈1.1 km away
Local sunshine: ~899 kWh/kWp · -2% vs CF47
CF44 (Rhondda Cynon Taf)
≈6.2 km away
Local sunshine: ~903 kWh/kWp · -1% vs CF47
CF45 (Rhondda Cynon Taf)
≈8.3 km away
Local sunshine: ~898 kWh/kWp · -2% vs CF47
NP22 (Blaenau Gwent)
≈9.0 km away
Local sunshine: ~919 kWh/kWp · +0% vs CF47
NP24 (Caerphilly)
≈10.0 km away
Local sunshine: ~881 kWh/kWp · -4% vs CF47
CF46 (Merthyr Tydfil)
≈10.9 km away
Local sunshine: ~939 kWh/kWp · +3% vs CF47

Similar sunshine across the UK

LS16 (Leeds)
~915 kWh/kWp · -0% vs CF47
LS18 (Leeds)
~915 kWh/kWp · -0% vs CF47
LS5 (Leeds)
~915 kWh/kWp · +0% vs CF47