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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in SY25 (Ceredigion)

See if solar pays off for you in Ceredigion — 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
14.6 years
After this, it's pure profit
Upfront Cost
£12,207
What you pay to get started
Annual Benefit
£834
What you save every year
Profit Over 25 Years
£8,635
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 830 kWh/kW — 138 below 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 830 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)
830 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: £695, Upfront: £10,173, 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 1661 kWh 664 kWh 997 kWh £178 £100 £278 £4,069 14.6 yrs £1,489
3 kW 2491 kWh 997 kWh 1495 kWh £267 £149 £417 £6,104 14.6 yrs £2,233
4 kW 3322 kWh 1329 kWh 1993 kWh £356 £199 £556 £8,138 14.6 yrs £2,978
5 kW 4152 kWh 1661 kWh 2491 kWh £446 £249 £695 £10,173 14.6 yrs £3,722
6 kW 4983 kWh 1993 kWh 2990 kWh £535 £299 £834 £12,207 14.6 yrs £4,467
7 kW 5813 kWh 2325 kWh 3488 kWh £624 £349 £973 £14,242 14.6 yrs £5,211
8 kW 6644 kWh 2657 kWh 3986 kWh £713 £399 £1,112 £16,276 14.6 yrs £5,956

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: £835, Upfront: £12,273, Break-even: 14.7 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1661 kWh 997 kWh 664 kWh £267 £66 £334 £6,169 18.5 yrs £507
3 kW 2491 kWh 1495 kWh 997 kWh £401 £100 £501 £8,204 16.4 yrs £1,811
4 kW 3322 kWh 1993 kWh 1329 kWh £535 £133 £668 £10,238 15.3 yrs £3,114
5 kW 4152 kWh 2491 kWh 1661 kWh £668 £166 £835 £12,273 14.7 yrs £4,418
6 kW 4983 kWh 2990 kWh 1993 kWh £802 £199 £1,001 £14,307 14.3 yrs £5,721
7 kW 5813 kWh 3488 kWh 2325 kWh £936 £233 £1,168 £16,342 14.0 yrs £7,025
8 kW 6644 kWh 3986 kWh 2657 kWh £1,069 £266 £1,335 £18,376 13.8 yrs £8,328

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: £904, Upfront: £13,673, Break-even: 15.1 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1661 kWh 1163 kWh 498 kWh £312 £50 £362 £7,569 20.9 yrs £-334
3 kW 2491 kWh 1744 kWh 747 kWh £468 £75 £543 £9,604 17.7 yrs £1,249
4 kW 3322 kWh 2325 kWh 997 kWh £624 £100 £724 £11,638 16.1 yrs £2,832
5 kW 4152 kWh 2907 kWh 1246 kWh £780 £125 £904 £13,673 15.1 yrs £4,415
6 kW 4983 kWh 3488 kWh 1495 kWh £936 £149 £1,085 £15,707 14.5 yrs £5,998
7 kW 5813 kWh 4069 kWh 1744 kWh £1,092 £174 £1,266 £17,742 14.0 yrs £7,581
8 kW 6644 kWh 4650 kWh 1993 kWh £1,248 £199 £1,447 £19,776 13.7 yrs £9,164

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: £925, Upfront: £15,423, Break-even: 16.7 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1661 kWh 1212 kWh 448 kWh £325 £45 £370 £9,319 25.2 yrs £-1,916
3 kW 2491 kWh 1819 kWh 673 kWh £488 £67 £555 £11,354 20.4 yrs £-249
4 kW 3322 kWh 2425 kWh 897 kWh £651 £90 £740 £13,388 18.1 yrs £1,418
5 kW 4152 kWh 3031 kWh 1121 kWh £813 £112 £925 £15,423 16.7 yrs £3,085
6 kW 4983 kWh 3637 kWh 1345 kWh £976 £135 £1,110 £17,457 15.7 yrs £4,751
7 kW 5813 kWh 4244 kWh 1570 kWh £1,139 £157 £1,295 £19,492 15.0 yrs £6,418
8 kW 6644 kWh 4850 kWh 1794 kWh £1,301 £179 £1,481 £21,526 14.5 yrs £8,085

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: £939, Upfront: £17,173, 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 1661 kWh 1246 kWh 415 kWh £334 £42 £376 £11,069 29.5 yrs £-3,554
3 kW 2491 kWh 1868 kWh 623 kWh £501 £62 £564 £13,104 23.2 yrs £-1,832
4 kW 3322 kWh 2491 kWh 830 kWh £668 £83 £751 £15,138 20.1 yrs £-109
5 kW 4152 kWh 3114 kWh 1038 kWh £836 £104 £939 £17,173 18.3 yrs £1,614
6 kW 4983 kWh 3737 kWh 1246 kWh £1,003 £125 £1,127 £19,207 17.0 yrs £3,337
7 kW 5813 kWh 4360 kWh 1453 kWh £1,170 £145 £1,315 £21,242 16.2 yrs £5,060
8 kW 6644 kWh 4983 kWh 1661 kWh £1,337 £166 £1,503 £23,276 15.5 yrs £6,783

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: £953, Upfront: £19,623, Break-even: 20.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1661 kWh 1279 kWh 382 kWh £343 £38 £381 £13,519 35.5 yrs £-5,893
3 kW 2491 kWh 1918 kWh 573 kWh £515 £57 £572 £15,554 27.2 yrs £-4,114
4 kW 3322 kWh 2558 kWh 764 kWh £686 £76 £763 £17,588 23.1 yrs £-2,335
5 kW 4152 kWh 3197 kWh 955 kWh £858 £96 £953 £19,623 20.6 yrs £-556
6 kW 4983 kWh 3837 kWh 1146 kWh £1,029 £115 £1,144 £21,657 18.9 yrs £1,222
7 kW 5813 kWh 4476 kWh 1337 kWh £1,201 £134 £1,335 £23,692 17.8 yrs £3,001
8 kW 6644 kWh 5116 kWh 1528 kWh £1,372 £153 £1,525 £25,726 16.9 yrs £4,780

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 SY25

Figures below are tailored to SY25 — click through for full league tables.

Big-Roof Britain Rank #129 of 2182
6.4 kWp (UK avg 5.1 kWp)
~13 panels (≈430 W)
Solar Payback Index Rank #2717 of 2997
12.7 years (UK avg 11.3 years)
~£959 /yr • £12,207 upfront
Standing-Charge Drag Rank #1351 of 2997
19.7% (UK avg 21.7%) drag on savings
£189 fixed • ~£959 /yr value

Your Area at a Glance

Your Electricity Rate
26.83p/kWh
Daily Fixed Charge
51.69p/day
Local Sunshine
830kWh/kW
A 1 kW system generates ~830 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: 74% • Flats: 2% • Bungalows: 23% Based on 1,374 properties

Coverage

Ceredigion (100%)

Areas Covered

Tregaron and Ystrad Fflur, Llangeitho, Lledrod, Llangybi, Llanfihangel Ystrad, Llanwrtyd Wells, Melindwr

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

SA48 (Ceredigion)
≈14.9 km away
Local sunshine: ~888 kWh/kWp · +7% vs SY25
SA46 (Ceredigion)
≈22.2 km away
Local sunshine: ~927 kWh/kWp · +12% vs SY25
SA40 (Carmarthenshire)
≈22.3 km away
Local sunshine: ~886 kWh/kWp · +7% vs SY25
LD5 (Powys)
≈23.6 km away
Local sunshine: ~878 kWh/kWp · +6% vs SY25
SA47 (Ceredigion)
≈25.3 km away
Local sunshine: ~921 kWh/kWp · +11% vs SY25
SA20 (Carmarthenshire)
≈26.6 km away
Local sunshine: ~863 kWh/kWp · +4% vs SY25

Similar sunshine across the UK

G13 (Glasgow City)
~830 kWh/kWp · +0% vs SY25
G12 (Glasgow City)
~830 kWh/kWp · -0% vs SY25
OL95 (Oldham)
~830 kWh/kWp · -0% vs SY25