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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in CF44 (Rhondda Cynon Taf)

See if solar pays off for you in Rhondda Cynon Taf — 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
13.5 years
After this, it's pure profit
Upfront Cost
£8,138
What you pay to get started
Annual Benefit
£604
What you save every year
Profit Over 25 Years
£6,967
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 903 kWh/kW — 66 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 903 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)
903 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: £755, Upfront: £10,173, Break-even: 13.5 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1806 kWh 722 kWh 1083 kWh £194 £108 £302 £4,069 13.5 yrs £1,973
3 kW 2708 kWh 1083 kWh 1625 kWh £291 £162 £453 £6,104 13.5 yrs £2,959
4 kW 3611 kWh 1444 kWh 2167 kWh £388 £217 £604 £8,138 13.5 yrs £3,946
5 kW 4514 kWh 1806 kWh 2708 kWh £484 £271 £755 £10,173 13.5 yrs £4,932
6 kW 5417 kWh 2167 kWh 3250 kWh £581 £325 £906 £12,207 13.5 yrs £5,919
7 kW 6319 kWh 2528 kWh 3792 kWh £678 £379 £1,057 £14,242 13.5 yrs £6,905
8 kW 7222 kWh 2889 kWh 4333 kWh £775 £433 £1,208 £16,276 13.5 yrs £7,892

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: £907, Upfront: £12,273, Break-even: 13.5 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1806 kWh 1083 kWh 722 kWh £291 £72 £363 £6,169 17.0 yrs £1,088
3 kW 2708 kWh 1625 kWh 1083 kWh £436 £108 £544 £8,204 15.1 yrs £2,683
4 kW 3611 kWh 2167 kWh 1444 kWh £581 £144 £726 £10,238 14.1 yrs £4,277
5 kW 4514 kWh 2708 kWh 1806 kWh £727 £181 £907 £12,273 13.5 yrs £5,871
6 kW 5417 kWh 3250 kWh 2167 kWh £872 £217 £1,089 £14,307 13.1 yrs £7,465
7 kW 6319 kWh 3792 kWh 2528 kWh £1,017 £253 £1,270 £16,342 12.9 yrs £9,060
8 kW 7222 kWh 4333 kWh 2889 kWh £1,163 £289 £1,451 £18,376 12.7 yrs £10,654

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: £983, Upfront: £13,673, Break-even: 13.9 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1806 kWh 1264 kWh 542 kWh £339 £54 £393 £7,569 19.2 yrs £296
3 kW 2708 kWh 1896 kWh 812 kWh £509 £81 £590 £9,604 16.3 yrs £2,194
4 kW 3611 kWh 2528 kWh 1083 kWh £678 £108 £787 £11,638 14.8 yrs £4,092
5 kW 4514 kWh 3160 kWh 1354 kWh £848 £135 £983 £13,673 13.9 yrs £5,990
6 kW 5417 kWh 3792 kWh 1625 kWh £1,017 £162 £1,180 £15,707 13.3 yrs £7,889
7 kW 6319 kWh 4424 kWh 1896 kWh £1,187 £190 £1,376 £17,742 12.9 yrs £9,787
8 kW 7222 kWh 5055 kWh 2167 kWh £1,356 £217 £1,573 £19,776 12.6 yrs £11,685

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: £1,006, Upfront: £15,423, Break-even: 15.3 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1806 kWh 1318 kWh 487 kWh £354 £49 £402 £9,319 23.2 yrs £-1,271
3 kW 2708 kWh 1977 kWh 731 kWh £530 £73 £604 £11,354 18.8 yrs £718
4 kW 3611 kWh 2636 kWh 975 kWh £707 £97 £805 £13,388 16.6 yrs £2,707
5 kW 4514 kWh 3295 kWh 1219 kWh £884 £122 £1,006 £15,423 15.3 yrs £4,696
6 kW 5417 kWh 3954 kWh 1462 kWh £1,061 £146 £1,207 £17,457 14.5 yrs £6,686
7 kW 6319 kWh 4613 kWh 1706 kWh £1,238 £171 £1,408 £19,492 13.8 yrs £8,675
8 kW 7222 kWh 5272 kWh 1950 kWh £1,415 £195 £1,610 £21,526 13.4 yrs £10,664

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: £1,021, Upfront: £17,173, Break-even: 16.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1806 kWh 1354 kWh 451 kWh £363 £45 £408 £11,069 27.1 yrs £-2,900
3 kW 2708 kWh 2031 kWh 677 kWh £545 £68 £613 £13,104 21.4 yrs £-850
4 kW 3611 kWh 2708 kWh 903 kWh £727 £90 £817 £15,138 18.5 yrs £1,200
5 kW 4514 kWh 3385 kWh 1128 kWh £908 £113 £1,021 £17,173 16.8 yrs £3,250
6 kW 5417 kWh 4062 kWh 1354 kWh £1,090 £135 £1,225 £19,207 15.7 yrs £5,300
7 kW 6319 kWh 4739 kWh 1580 kWh £1,272 £158 £1,430 £21,242 14.9 yrs £7,350
8 kW 7222 kWh 5417 kWh 1806 kWh £1,453 £181 £1,634 £23,276 14.2 yrs £9,400

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: £1,036, Upfront: £19,623, Break-even: 18.9 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1806 kWh 1390 kWh 415 kWh £373 £42 £415 £13,519 32.6 yrs £-5,228
3 kW 2708 kWh 2085 kWh 623 kWh £560 £62 £622 £15,554 25.0 yrs £-3,118
4 kW 3611 kWh 2781 kWh 831 kWh £746 £83 £829 £17,588 21.2 yrs £-1,007
5 kW 4514 kWh 3476 kWh 1038 kWh £933 £104 £1,036 £19,623 18.9 yrs £1,104
6 kW 5417 kWh 4171 kWh 1246 kWh £1,119 £125 £1,244 £21,657 17.4 yrs £3,215
7 kW 6319 kWh 4866 kWh 1453 kWh £1,306 £145 £1,451 £23,692 16.3 yrs £5,326
8 kW 7222 kWh 5561 kWh 1661 kWh £1,492 £166 £1,658 £25,726 15.5 yrs £7,436

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 CF44

Figures below are tailored to CF44 — click through for full league tables.

Big-Roof Britain Rank #1464 of 2182
4.7 kWp (UK avg 5.1 kWp)
~10 panels (≈430 W)
Solar Payback Index Rank #1967 of 2997
11.7 years (UK avg 11.3 years)
~£695 /yr • £8,138 upfront
Standing-Charge Drag Rank #2422 of 2997
27.1% (UK avg 21.7%) drag on savings
£189 fixed • ~£695 /yr value

Your Area at a Glance

Your Electricity Rate
26.83p/kWh
Daily Fixed Charge
51.69p/day
Local Sunshine
903kWh/kW
A 1 kW system generates ~903 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: 80% • Flats: 14% • Bungalows: 5% Based on 10,174 properties

Coverage

Rhondda Cynon Taf (99%)

Areas Covered

Aberaman, Aberdare East, Aberdare West and Llwydcoed, Hirwaun, Penderyn and Rhigos, Cwmbach, Pen-y-waun, Tawe Uchaf + 2 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

CF43 (Rhondda Cynon Taf)
≈6.2 km away
Local sunshine: ~921 kWh/kWp · +2% vs CF44
CF47 (Merthyr Tydfil)
≈6.2 km away
Local sunshine: ~915 kWh/kWp · +1% vs CF44
CF45 (Rhondda Cynon Taf)
≈6.8 km away
Local sunshine: ~898 kWh/kWp · -1% vs CF44
CF48 (Merthyr Tydfil)
≈7.2 km away
Local sunshine: ~899 kWh/kWp · -0% vs CF44
CF42 (Rhondda Cynon Taf)
≈7.5 km away
Local sunshine: ~884 kWh/kWp · -2% vs CF44
CF41 (Rhondda Cynon Taf)
≈8.1 km away
Local sunshine: ~927 kWh/kWp · +3% vs CF44

Similar sunshine across the UK

CA14 (Cumberland)
~903 kWh/kWp · +0% vs CF44
S30 (Sheffield)
~903 kWh/kWp · +0% vs CF44
CW4 (Cheshire East)
~903 kWh/kWp · +0% vs CF44