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Solar panel cost in Merthyr Tydfil (CF48)

See realistic solar installation costs, savings and payback for CF48 (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
12.3 years
After this, it's pure profit
Upfront Cost
£7,307
What you pay to get started
Annual Benefit
£595
What you save every year
Profit Over 25 Years
£7,558
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 899 kWh/kW — 69 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 899 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)
899 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: £743, Upfront: £9,134, Break-even: 12.3 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1798 kWh 719 kWh 1079 kWh £189 £108 £297 £3,654 12.3 yrs £2,292
3 kW 2698 kWh 1079 kWh 1619 kWh £284 £162 £446 £5,481 12.3 yrs £3,439
4 kW 3597 kWh 1439 kWh 2158 kWh £379 £216 £595 £7,307 12.3 yrs £4,585
5 kW 4496 kWh 1798 kWh 2698 kWh £474 £270 £743 £9,134 12.3 yrs £5,731
6 kW 5395 kWh 2158 kWh 3237 kWh £568 £324 £892 £10,961 12.3 yrs £6,877
7 kW 6294 kWh 2518 kWh 3777 kWh £663 £378 £1,041 £12,788 12.3 yrs £8,024
8 kW 7194 kWh 2877 kWh 4316 kWh £758 £432 £1,189 £14,615 12.3 yrs £9,170

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: £890, Upfront: £11,234, 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 1798 kWh 1079 kWh 719 kWh £284 £72 £356 £5,754 16.2 yrs £1,367
3 kW 2698 kWh 1619 kWh 1079 kWh £426 £108 £534 £7,581 14.2 yrs £3,101
4 kW 3597 kWh 2158 kWh 1439 kWh £568 £144 £712 £9,407 13.2 yrs £4,834
5 kW 4496 kWh 2698 kWh 1798 kWh £710 £180 £890 £11,234 12.6 yrs £6,568
6 kW 5395 kWh 3237 kWh 2158 kWh £852 £216 £1,068 £13,061 12.2 yrs £8,302
7 kW 6294 kWh 3777 kWh 2518 kWh £994 £252 £1,246 £14,888 11.9 yrs £10,035
8 kW 7194 kWh 4316 kWh 2877 kWh £1,136 £288 £1,424 £16,715 11.7 yrs £11,769

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: £964, Upfront: £12,634, Break-even: 13.1 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1798 kWh 1259 kWh 540 kWh £331 £54 £385 £7,154 18.6 yrs £555
3 kW 2698 kWh 1888 kWh 809 kWh £497 £81 £578 £8,981 15.5 yrs £2,582
4 kW 3597 kWh 2518 kWh 1079 kWh £663 £108 £771 £10,807 14.0 yrs £4,609
5 kW 4496 kWh 3147 kWh 1349 kWh £829 £135 £964 £12,634 13.1 yrs £6,636
6 kW 5395 kWh 3777 kWh 1619 kWh £994 £162 £1,156 £14,461 12.5 yrs £8,664
7 kW 6294 kWh 4406 kWh 1888 kWh £1,160 £189 £1,349 £16,288 12.1 yrs £10,691
8 kW 7194 kWh 5035 kWh 2158 kWh £1,326 £216 £1,542 £18,115 11.8 yrs £12,718

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: £986, Upfront: £14,384, Break-even: 14.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1798 kWh 1313 kWh 486 kWh £346 £49 £394 £8,904 22.6 yrs £-1,019
3 kW 2698 kWh 1969 kWh 728 kWh £518 £73 £591 £10,731 18.1 yrs £1,096
4 kW 3597 kWh 2626 kWh 971 kWh £691 £97 £788 £12,557 15.9 yrs £3,211
5 kW 4496 kWh 3282 kWh 1214 kWh £864 £121 £986 £14,384 14.6 yrs £5,327
6 kW 5395 kWh 3938 kWh 1457 kWh £1,037 £146 £1,183 £16,211 13.7 yrs £7,442
7 kW 6294 kWh 4595 kWh 1699 kWh £1,210 £170 £1,380 £18,038 13.1 yrs £9,558
8 kW 7194 kWh 5251 kWh 1942 kWh £1,383 £194 £1,577 £19,865 12.6 yrs £11,673

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: £1,000, Upfront: £16,134, Break-even: 16.1 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1798 kWh 1349 kWh 450 kWh £355 £45 £400 £10,654 26.6 yrs £-2,652
3 kW 2698 kWh 2023 kWh 674 kWh £533 £67 £600 £12,481 20.8 yrs £-478
4 kW 3597 kWh 2698 kWh 899 kWh £710 £90 £800 £14,307 17.9 yrs £1,696
5 kW 4496 kWh 3372 kWh 1124 kWh £888 £112 £1,000 £16,134 16.1 yrs £3,871
6 kW 5395 kWh 4046 kWh 1349 kWh £1,065 £135 £1,200 £17,961 15.0 yrs £6,045
7 kW 6294 kWh 4721 kWh 1574 kWh £1,243 £157 £1,400 £19,788 14.1 yrs £8,219
8 kW 7194 kWh 5395 kWh 1798 kWh £1,421 £180 £1,600 £21,615 13.5 yrs £10,393

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: £1,015, Upfront: £18,584, Break-even: 18.3 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1798 kWh 1385 kWh 414 kWh £365 £41 £406 £13,104 32.3 yrs £-4,984
3 kW 2698 kWh 2077 kWh 620 kWh £547 £62 £609 £14,931 24.5 yrs £-2,751
4 kW 3597 kWh 2770 kWh 827 kWh £729 £83 £812 £16,757 20.6 yrs £-519
5 kW 4496 kWh 3462 kWh 1034 kWh £912 £103 £1,015 £18,584 18.3 yrs £1,714
6 kW 5395 kWh 4154 kWh 1241 kWh £1,094 £124 £1,218 £20,411 16.8 yrs £3,947
7 kW 6294 kWh 4847 kWh 1448 kWh £1,276 £145 £1,421 £22,238 15.7 yrs £6,180
8 kW 7194 kWh 5539 kWh 1655 kWh £1,458 £165 £1,624 £24,065 14.8 yrs £8,413

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 CF48

Figures below are tailored to CF48 — click through for full league tables.

Big-Roof Britain Rank #1375 of 2182
4.8 kWp (UK avg 5.1 kWp)
~10 panels (≈430 W)
Solar Payback Index Rank #2645 of 2996
12.3 years (UK avg 10.8 years)
~£594 /yr • £7,307 upfront
Standing-Charge Drag Rank #2608 of 2996
35.5% (UK avg 26.6%) drag on savings
£211 fixed • ~£594 /yr value
Aspect Penalty View ranking →
East −19.8% West −17.7%
Typical output loss versus a south-facing roof (lower is better)

Seasonal solar output in CF48

Monthly generation per kilowatt of solar panels

kWh 29 Jan 45 Feb 80 Mar 107 Apr 116 May 112 Jun 111 Jul 99 Aug 85 Sep 55 Oct 35 Nov 24 Dec
Best month Worst month Winter (Dec–Feb) Other months

Winter output: 43.5% 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 33 kWh per month; the average month produces around 75 kWh. So a typical 4 kW home system would generate roughly 130 kWh in winter, or 300 kWh in an average month.

Your Area at a Glance

Your Electricity Rate
26.33p/kWh
Daily Fixed Charge
57.84p/day
Local Sunshine
899kWh/kW
A 1 kW system generates ~899 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: 8% • Bungalows: 9% Based on 7,486 properties

Coverage

Merthyr Tydfil (99%)

Areas Covered

Dowlais and Pant, Plymouth, Cyfarthfa, Vaynor, Merthyr Vale, Park, Town, Talybont-on-Usk + 5 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

CF47 (Merthyr Tydfil)
≈1.1 km away
Local sunshine: ~915 kWh/kWp · +2% vs CF48
CF44 (Rhondda Cynon Taf)
≈7.2 km away
Local sunshine: ~903 kWh/kWp · +0% vs CF48
NP22 (Blaenau Gwent)
≈7.9 km away
Local sunshine: ~919 kWh/kWp · +2% vs CF48
CF45 (Rhondda Cynon Taf)
≈8.5 km away
Local sunshine: ~898 kWh/kWp · -0% vs CF48
NP24 (Caerphilly)
≈9.0 km away
Local sunshine: ~881 kWh/kWp · -2% vs CF48
CF46 (Merthyr Tydfil)
≈10.6 km away
Local sunshine: ~939 kWh/kWp · +4% vs CF48

Similar sunshine across the UK

ST4 (Stoke-on-Trent)
~899 kWh/kWp · +0% vs CF48
PA77 (Argyll and Bute)
~899 kWh/kWp · -0% vs CF48
ST1 (Stoke-on-Trent)
~900 kWh/kWp · +0% vs CF48