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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in SY23 (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
12.9 years
After this, it's pure profit
Upfront Cost
£12,207
What you pay to get started
Annual Benefit
£948
What you save every year
Profit Over 25 Years
£11,488
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 North Wales and Mersey, the current unit rate is 27.72p/kWh with a 69.95p/day standing charge. Your postcode’s south-facing sunshine yield is 924 kWh/kW — 6 below the regional median (930).

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 924 kWh per year on a south-facing roof. We value self-used electricity at 27.7p and exported surplus at a baseline 10p via SEG. Use the calculator above for your exact tariff.

Unit rate
27.7p/kWh
Standing charge
70.0p/day
Sunshine yield (south)
924 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: £790, Upfront: £10,173, 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 1849 kWh 740 kWh 1109 kWh £205 £111 £316 £4,069 12.9 yrs £2,250
3 kW 2773 kWh 1109 kWh 1664 kWh £307 £166 £474 £6,104 12.9 yrs £3,374
4 kW 3698 kWh 1479 kWh 2219 kWh £410 £222 £632 £8,138 12.9 yrs £4,499
5 kW 4622 kWh 1849 kWh 2773 kWh £512 £277 £790 £10,173 12.9 yrs £5,624
6 kW 5547 kWh 2219 kWh 3328 kWh £615 £333 £948 £12,207 12.9 yrs £6,749
7 kW 6471 kWh 2588 kWh 3883 kWh £717 £388 £1,106 £14,242 12.9 yrs £7,874
8 kW 7395 kWh 2958 kWh 4437 kWh £820 £444 £1,264 £16,276 12.9 yrs £8,998

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: £954, Upfront: £12,273, 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 1849 kWh 1109 kWh 740 kWh £307 £74 £381 £6,169 16.2 yrs £1,460
3 kW 2773 kWh 1664 kWh 1109 kWh £461 £111 £572 £8,204 14.3 yrs £3,240
4 kW 3698 kWh 2219 kWh 1479 kWh £615 £148 £763 £10,238 13.4 yrs £5,020
5 kW 4622 kWh 2773 kWh 1849 kWh £769 £185 £954 £12,273 12.9 yrs £6,800
6 kW 5547 kWh 3328 kWh 2219 kWh £922 £222 £1,144 £14,307 12.5 yrs £8,580
7 kW 6471 kWh 3883 kWh 2588 kWh £1,076 £259 £1,335 £16,342 12.2 yrs £10,360
8 kW 7395 kWh 4437 kWh 2958 kWh £1,230 £296 £1,526 £18,376 12.0 yrs £12,140

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: £1,036, Upfront: £13,673, 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 1849 kWh 1294 kWh 555 kWh £359 £55 £414 £7,569 18.3 yrs £715
3 kW 2773 kWh 1941 kWh 832 kWh £538 £83 £621 £9,604 15.5 yrs £2,823
4 kW 3698 kWh 2588 kWh 1109 kWh £717 £111 £828 £11,638 14.0 yrs £4,931
5 kW 4622 kWh 3235 kWh 1387 kWh £897 £139 £1,036 £13,673 13.2 yrs £7,038
6 kW 5547 kWh 3883 kWh 1664 kWh £1,076 £166 £1,243 £15,707 12.6 yrs £9,146
7 kW 6471 kWh 4530 kWh 1941 kWh £1,256 £194 £1,450 £17,742 12.2 yrs £11,253
8 kW 7395 kWh 5177 kWh 2219 kWh £1,435 £222 £1,657 £19,776 11.9 yrs £13,361

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: £1,060, Upfront: £15,423, Break-even: 14.5 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1849 kWh 1350 kWh 499 kWh £374 £50 £424 £9,319 22.0 yrs £-838
3 kW 2773 kWh 2024 kWh 749 kWh £561 £75 £636 £11,354 17.8 yrs £1,368
4 kW 3698 kWh 2699 kWh 998 kWh £748 £100 £848 £13,388 15.8 yrs £3,574
5 kW 4622 kWh 3374 kWh 1248 kWh £935 £125 £1,060 £15,423 14.5 yrs £5,780
6 kW 5547 kWh 4049 kWh 1498 kWh £1,122 £150 £1,272 £17,457 13.7 yrs £7,985
7 kW 6471 kWh 4724 kWh 1747 kWh £1,309 £175 £1,484 £19,492 13.1 yrs £10,191
8 kW 7395 kWh 5399 kWh 1997 kWh £1,496 £200 £1,696 £21,526 12.7 yrs £12,397

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: £1,076, Upfront: £17,173, Break-even: 16.0 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1849 kWh 1387 kWh 462 kWh £384 £46 £431 £11,069 25.7 yrs £-2,457
3 kW 2773 kWh 2080 kWh 693 kWh £577 £69 £646 £13,104 20.3 yrs £-186
4 kW 3698 kWh 2773 kWh 924 kWh £769 £92 £861 £15,138 17.6 yrs £2,086
5 kW 4622 kWh 3467 kWh 1156 kWh £961 £116 £1,076 £17,173 16.0 yrs £4,357
6 kW 5547 kWh 4160 kWh 1387 kWh £1,153 £139 £1,292 £19,207 14.9 yrs £6,629
7 kW 6471 kWh 4853 kWh 1618 kWh £1,345 £162 £1,507 £21,242 14.1 yrs £8,900
8 kW 7395 kWh 5547 kWh 1849 kWh £1,537 £185 £1,722 £23,276 13.5 yrs £11,172

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: £1,093, Upfront: £19,623, 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 1849 kWh 1424 kWh 425 kWh £395 £43 £437 £13,519 30.9 yrs £-4,776
3 kW 2773 kWh 2135 kWh 638 kWh £592 £64 £656 £15,554 23.7 yrs £-2,439
4 kW 3698 kWh 2847 kWh 850 kWh £789 £85 £874 £17,588 20.1 yrs £-102
5 kW 4622 kWh 3559 kWh 1063 kWh £987 £106 £1,093 £19,623 18.0 yrs £2,235
6 kW 5547 kWh 4271 kWh 1276 kWh £1,184 £128 £1,311 £21,657 16.5 yrs £4,572
7 kW 6471 kWh 4983 kWh 1488 kWh £1,381 £149 £1,530 £23,692 15.5 yrs £6,909
8 kW 7395 kWh 5694 kWh 1701 kWh £1,578 £170 £1,749 £25,726 14.7 yrs £9,246

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 SY23

Figures below are tailored to SY23 — click through for full league tables.

Big-Roof Britain Rank #714 of 2182
5.3 kWp (UK avg 5.1 kWp)
~11 panels (≈430 W)
Solar Payback Index Rank #1463 of 2997
11.1 years (UK avg 11.3 years)
~£1,095 /yr • £12,207 upfront
Standing-Charge Drag Rank #2102 of 2997
23.3% (UK avg 21.7%) drag on savings
£255 fixed • ~£1,095 /yr value

Your Area at a Glance

Your Electricity Rate
27.72p/kWh
Daily Fixed Charge
69.95p/day
Local Sunshine
924kWh/kW
A 1 kW system generates ~924 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: 26% • Bungalows: 13% Based on 8,494 properties

Coverage

Ceredigion (100%)

Areas Covered

Aberystwyth Morfa a Glais, Llanfarian, Llanbadarn Fawr, Ystwyth, Melindwr, Llansanffraid, Aberystwyth Rheidol, Llanrhystyd + 4 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 North Wales and Mersey

SY24 (Ceredigion)
≈8.3 km away
Local sunshine: ~880 kWh/kWp · -5% vs SY23
LL35 (Gwynedd)
≈15.5 km away
Local sunshine: ~877 kWh/kWp · -5% vs SY23
LL36 (Gwynedd)
≈20.1 km away
Local sunshine: ~940 kWh/kWp · +2% vs SY23
SY20 (Powys)
≈25.7 km away
Local sunshine: ~817 kWh/kWp · -12% vs SY23
LL37 (Gwynedd)
≈28.8 km away
Local sunshine: ~878 kWh/kWp · -5% vs SY23
LL38 (Gwynedd)
≈32.2 km away
Local sunshine: ~846 kWh/kWp · -9% vs SY23

Similar sunshine across the UK

TS19 (Stockton-on-Tees)
~924 kWh/kWp · -0% vs SY23
TS18 (Stockton-on-Tees)
~924 kWh/kWp · -0% vs SY23
TS20 (Stockton-on-Tees)
~925 kWh/kWp · +0% vs SY23