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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in SA47 (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
13.2 years
After this, it's pure profit
Upfront Cost
£12,207
What you pay to get started
Annual Benefit
£925
What you save every year
Profit Over 25 Years
£10,918
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 921 kWh/kW — 47 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 921 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)
921 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: £771, Upfront: £10,173, Break-even: 13.2 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1843 kWh 737 kWh 1106 kWh £198 £111 £308 £4,069 13.2 yrs £2,098
3 kW 2764 kWh 1106 kWh 1659 kWh £297 £166 £463 £6,104 13.2 yrs £3,146
4 kW 3686 kWh 1474 kWh 2211 kWh £396 £221 £617 £8,138 13.2 yrs £4,195
5 kW 4607 kWh 1843 kWh 2764 kWh £494 £276 £771 £10,173 13.2 yrs £5,244
6 kW 5528 kWh 2211 kWh 3317 kWh £593 £332 £925 £12,207 13.2 yrs £6,293
7 kW 6450 kWh 2580 kWh 3870 kWh £692 £387 £1,079 £14,242 13.2 yrs £7,342
8 kW 7371 kWh 2948 kWh 4423 kWh £791 £442 £1,233 £16,276 13.2 yrs £8,391

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: £926, Upfront: £12,273, Break-even: 13.3 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1843 kWh 1106 kWh 737 kWh £297 £74 £370 £6,169 16.7 yrs £1,238
3 kW 2764 kWh 1659 kWh 1106 kWh £445 £111 £556 £8,204 14.8 yrs £2,907
4 kW 3686 kWh 2211 kWh 1474 kWh £593 £147 £741 £10,238 13.8 yrs £4,576
5 kW 4607 kWh 2764 kWh 1843 kWh £742 £184 £926 £12,273 13.3 yrs £6,246
6 kW 5528 kWh 3317 kWh 2211 kWh £890 £221 £1,111 £14,307 12.9 yrs £7,915
7 kW 6450 kWh 3870 kWh 2580 kWh £1,038 £258 £1,296 £16,342 12.6 yrs £9,584
8 kW 7371 kWh 4423 kWh 2948 kWh £1,187 £295 £1,481 £18,376 12.4 yrs £11,253

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: £1,003, Upfront: £13,673, Break-even: 13.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1843 kWh 1290 kWh 553 kWh £346 £55 £401 £7,569 18.9 yrs £458
3 kW 2764 kWh 1935 kWh 829 kWh £519 £83 £602 £9,604 16.0 yrs £2,438
4 kW 3686 kWh 2580 kWh 1106 kWh £692 £111 £803 £11,638 14.5 yrs £4,417
5 kW 4607 kWh 3225 kWh 1382 kWh £865 £138 £1,003 £13,673 13.6 yrs £6,396
6 kW 5528 kWh 3870 kWh 1659 kWh £1,038 £166 £1,204 £15,707 13.0 yrs £8,375
7 kW 6450 kWh 4515 kWh 1935 kWh £1,211 £193 £1,405 £17,742 12.6 yrs £10,355
8 kW 7371 kWh 5160 kWh 2211 kWh £1,384 £221 £1,606 £19,776 12.3 yrs £12,334

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: £1,027, Upfront: £15,423, Break-even: 15.0 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1843 kWh 1345 kWh 498 kWh £361 £50 £411 £9,319 22.7 yrs £-1,105
3 kW 2764 kWh 2018 kWh 746 kWh £541 £75 £616 £11,354 18.4 yrs £967
4 kW 3686 kWh 2690 kWh 995 kWh £722 £100 £821 £13,388 16.3 yrs £3,039
5 kW 4607 kWh 3363 kWh 1244 kWh £902 £124 £1,027 £15,423 15.0 yrs £5,111
6 kW 5528 kWh 4036 kWh 1493 kWh £1,083 £149 £1,232 £17,457 14.2 yrs £7,184
7 kW 6450 kWh 4708 kWh 1741 kWh £1,263 £174 £1,437 £19,492 13.6 yrs £9,256
8 kW 7371 kWh 5381 kWh 1990 kWh £1,444 £199 £1,643 £21,526 13.1 yrs £11,328

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: £1,042, Upfront: £17,173, Break-even: 16.5 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1843 kWh 1382 kWh 461 kWh £371 £46 £417 £11,069 26.6 yrs £-2,731
3 kW 2764 kWh 2073 kWh 691 kWh £556 £69 £625 £13,104 21.0 yrs £-597
4 kW 3686 kWh 2764 kWh 921 kWh £742 £92 £834 £15,138 18.2 yrs £1,537
5 kW 4607 kWh 3455 kWh 1152 kWh £927 £115 £1,042 £17,173 16.5 yrs £3,672
6 kW 5528 kWh 4146 kWh 1382 kWh £1,112 £138 £1,251 £19,207 15.4 yrs £5,806
7 kW 6450 kWh 4837 kWh 1612 kWh £1,298 £161 £1,459 £21,242 14.6 yrs £7,940
8 kW 7371 kWh 5528 kWh 1843 kWh £1,483 £184 £1,668 £23,276 14.0 yrs £10,075

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: £1,058, Upfront: £19,623, Break-even: 18.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1843 kWh 1419 kWh 424 kWh £381 £42 £423 £13,519 32.0 yrs £-5,057
3 kW 2764 kWh 2128 kWh 636 kWh £571 £64 £635 £15,554 24.5 yrs £-2,861
4 kW 3686 kWh 2838 kWh 848 kWh £761 £85 £846 £17,588 20.8 yrs £-665
5 kW 4607 kWh 3547 kWh 1060 kWh £952 £106 £1,058 £19,623 18.6 yrs £1,532
6 kW 5528 kWh 4257 kWh 1272 kWh £1,142 £127 £1,269 £21,657 17.1 yrs £3,728
7 kW 6450 kWh 4966 kWh 1483 kWh £1,332 £148 £1,481 £23,692 16.0 yrs £5,924
8 kW 7371 kWh 5676 kWh 1695 kWh £1,523 £170 £1,692 £25,726 15.2 yrs £8,121

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 SA47

Figures below are tailored to SA47 — click through for full league tables.

Big-Roof Britain Rank #137 of 2182
6.4 kWp (UK avg 5.1 kWp)
~13 panels (≈430 W)
Solar Payback Index Rank #1804 of 2997
11.5 years (UK avg 11.3 years)
~£1,065 /yr • £12,207 upfront
Standing-Charge Drag Rank #911 of 2997
17.7% (UK avg 21.7%) drag on savings
£189 fixed • ~£1,065 /yr value

Your Area at a Glance

Your Electricity Rate
26.83p/kWh
Daily Fixed Charge
51.69p/day
Local Sunshine
921kWh/kW
A 1 kW system generates ~921 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: 59% • Flats: 6% • Bungalows: 32% Based on 456 properties

Coverage

Ceredigion (100%)

Areas Covered

Llannarth, Ciliau Aeron, New Quay and Llanllwchaearn, Lampeter

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

SA45 (Ceredigion)
≈4.2 km away
Local sunshine: ~909 kWh/kWp · -1% vs SA47
SA46 (Ceredigion)
≈6.1 km away
Local sunshine: ~927 kWh/kWp · +1% vs SA47
SA44 (Ceredigion)
≈14.4 km away
Local sunshine: ~893 kWh/kWp · -3% vs SA47
SA40 (Carmarthenshire)
≈16.3 km away
Local sunshine: ~886 kWh/kWp · -4% vs SA47
SA48 (Ceredigion)
≈17.1 km away
Local sunshine: ~888 kWh/kWp · -4% vs SA47
SA39 (Carmarthenshire)
≈19.6 km away
Local sunshine: ~888 kWh/kWp · -4% vs SA47

Similar sunshine across the UK

TS4 (Middlesbrough)
~921 kWh/kWp · +0% vs SA47
TS1 (Middlesbrough)
~921 kWh/kWp · +0% vs SA47
TS90 (Middlesbrough)
~921 kWh/kWp · +0% vs SA47