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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in LL32 (Conwy)

See if solar pays off for you in Conwy — 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
13.1 years
After this, it's pure profit
Upfront Cost
£10,173
What you pay to get started
Annual Benefit
£774
What you save every year
Profit Over 25 Years
£9,173
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 906 kWh/kW — 24 below the regional median (930).

Read the full story

A typical roof here lands around 5.0 kW, with most eligible homes comfortably fitting within 3–6 kW. Each kilowatt of panels produces roughly 906 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)
906 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: £774, Upfront: £10,173, 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 1811 kWh 725 kWh 1087 kWh £201 £109 £310 £4,069 13.1 yrs £2,121
3 kW 2717 kWh 1087 kWh 1630 kWh £301 £163 £464 £6,104 13.1 yrs £3,182
4 kW 3623 kWh 1449 kWh 2174 kWh £402 £217 £619 £8,138 13.1 yrs £4,243
5 kW 4528 kWh 1811 kWh 2717 kWh £502 £272 £774 £10,173 13.1 yrs £5,304
6 kW 5434 kWh 2174 kWh 3260 kWh £603 £326 £929 £12,207 13.1 yrs £6,364
7 kW 6340 kWh 2536 kWh 3804 kWh £703 £380 £1,083 £14,242 13.1 yrs £7,425
8 kW 7245 kWh 2898 kWh 4347 kWh £803 £435 £1,238 £16,276 13.1 yrs £8,486

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: £934, Upfront: £12,273, 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 1811 kWh 1087 kWh 725 kWh £301 £72 £374 £6,169 16.5 yrs £1,305
3 kW 2717 kWh 1630 kWh 1087 kWh £452 £109 £561 £8,204 14.6 yrs £3,008
4 kW 3623 kWh 2174 kWh 1449 kWh £603 £145 £747 £10,238 13.7 yrs £4,711
5 kW 4528 kWh 2717 kWh 1811 kWh £753 £181 £934 £12,273 13.1 yrs £6,413
6 kW 5434 kWh 3260 kWh 2174 kWh £904 £217 £1,121 £14,307 12.8 yrs £8,116
7 kW 6340 kWh 3804 kWh 2536 kWh £1,054 £254 £1,308 £16,342 12.5 yrs £9,819
8 kW 7245 kWh 4347 kWh 2898 kWh £1,205 £290 £1,495 £18,376 12.3 yrs £11,522

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: £1,015, Upfront: £13,673, 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 1811 kWh 1268 kWh 543 kWh £351 £54 £406 £7,569 18.7 yrs £547
3 kW 2717 kWh 1902 kWh 815 kWh £527 £82 £609 £9,604 15.8 yrs £2,571
4 kW 3623 kWh 2536 kWh 1087 kWh £703 £109 £812 £11,638 14.3 yrs £4,595
5 kW 4528 kWh 3170 kWh 1359 kWh £879 £136 £1,015 £13,673 13.5 yrs £6,618
6 kW 5434 kWh 3804 kWh 1630 kWh £1,054 £163 £1,217 £15,707 12.9 yrs £8,642
7 kW 6340 kWh 4438 kWh 1902 kWh £1,230 £190 £1,420 £17,742 12.5 yrs £10,666
8 kW 7245 kWh 5072 kWh 2174 kWh £1,406 £217 £1,623 £19,776 12.2 yrs £12,689

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: £1,039, Upfront: £15,423, Break-even: 14.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1811 kWh 1322 kWh 489 kWh £367 £49 £415 £9,319 22.4 yrs £-1,010
3 kW 2717 kWh 1983 kWh 734 kWh £550 £73 £623 £11,354 18.2 yrs £1,110
4 kW 3623 kWh 2645 kWh 978 kWh £733 £98 £831 £13,388 16.1 yrs £3,230
5 kW 4528 kWh 3306 kWh 1223 kWh £916 £122 £1,039 £15,423 14.8 yrs £5,350
6 kW 5434 kWh 3967 kWh 1467 kWh £1,100 £147 £1,246 £17,457 14.0 yrs £7,470
7 kW 6340 kWh 4628 kWh 1712 kWh £1,283 £171 £1,454 £19,492 13.4 yrs £9,590
8 kW 7245 kWh 5289 kWh 1956 kWh £1,466 £196 £1,662 £21,526 13.0 yrs £11,710

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: £1,055, Upfront: £17,173, Break-even: 16.3 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1811 kWh 1359 kWh 453 kWh £377 £45 £422 £11,069 26.2 yrs £-2,632
3 kW 2717 kWh 2038 kWh 679 kWh £565 £68 £633 £13,104 20.7 yrs £-448
4 kW 3623 kWh 2717 kWh 906 kWh £753 £91 £844 £15,138 17.9 yrs £1,737
5 kW 4528 kWh 3396 kWh 1132 kWh £941 £113 £1,055 £17,173 16.3 yrs £3,921
6 kW 5434 kWh 4076 kWh 1359 kWh £1,130 £136 £1,266 £19,207 15.2 yrs £6,105
7 kW 6340 kWh 4755 kWh 1585 kWh £1,318 £158 £1,477 £21,242 14.4 yrs £8,289
8 kW 7245 kWh 5434 kWh 1811 kWh £1,506 £181 £1,687 £23,276 13.8 yrs £10,473

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: £1,071, Upfront: £19,623, 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 1811 kWh 1395 kWh 417 kWh £387 £42 £428 £13,519 31.6 yrs £-4,953
3 kW 2717 kWh 2092 kWh 625 kWh £580 £62 £642 £15,554 24.2 yrs £-2,705
4 kW 3623 kWh 2789 kWh 833 kWh £773 £83 £857 £17,588 20.5 yrs £-457
5 kW 4528 kWh 3487 kWh 1042 kWh £967 £104 £1,071 £19,623 18.3 yrs £1,792
6 kW 5434 kWh 4184 kWh 1250 kWh £1,160 £125 £1,285 £21,657 16.9 yrs £4,040
7 kW 6340 kWh 4882 kWh 1458 kWh £1,353 £146 £1,499 £23,692 15.8 yrs £6,288
8 kW 7245 kWh 5579 kWh 1666 kWh £1,546 £167 £1,713 £25,726 15.0 yrs £8,537

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 LL32

Figures below are tailored to LL32 — click through for full league tables.

Big-Roof Britain Rank #855 of 2182
5.2 kWp (UK avg 5.1 kWp)
~11 panels (≈430 W)
Solar Payback Index Rank #1704 of 2997
11.4 years (UK avg 11.3 years)
~£894 /yr • £10,173 upfront
Standing-Charge Drag Rank #2608 of 2997
28.6% (UK avg 21.7%) drag on savings
£255 fixed • ~£894 /yr value

Your Area at a Glance

Your Electricity Rate
27.72p/kWh
Daily Fixed Charge
69.95p/day
Local Sunshine
906kWh/kW
A 1 kW system generates ~906 kWh per year. A typical home uses ~2,700 kWh per year.
Typical System Size
5.0kW
For houses & bungalows in this area

Local Property Data

Property Types

Houses: 75% • Flats: 10% • Bungalows: 14% Based on 1,980 properties

Coverage

Conwy (100%)

Areas Covered

Conwy, Caerhun, Tudno, Betws-y-Coed and Trefriw, Glyn y Marl, Penmaenmawr

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

LL31 (Conwy)
≈2.5 km away
Local sunshine: ~908 kWh/kWp · +0% vs LL32
LL30 (Conwy)
≈4.7 km away
Local sunshine: ~919 kWh/kWp · +2% vs LL32
LL34 (Conwy)
≈5.4 km away
Local sunshine: ~871 kWh/kWp · -4% vs LL32
LL28 (Conwy)
≈6.3 km away
Local sunshine: ~900 kWh/kWp · -1% vs LL32
LL29 (Conwy)
≈7.8 km away
Local sunshine: ~923 kWh/kWp · +2% vs LL32
LL33 (Conwy)
≈9.4 km away
Local sunshine: ~886 kWh/kWp · -2% vs LL32

Similar sunshine across the UK

DG12 (Dumfries and Galloway)
~906 kWh/kWp · -0% vs LL32
BD17 (Bradford)
~906 kWh/kWp · +0% vs LL32
BD9 (Bradford)
~906 kWh/kWp · +0% vs LL32