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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in LL31 (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
£775
What you save every year
Profit Over 25 Years
£9,212
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 908 kWh/kW — 22 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 908 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)
908 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: £775, 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 1815 kWh 726 kWh 1089 kWh £201 £109 £310 £4,069 13.1 yrs £2,134
3 kW 2723 kWh 1089 kWh 1634 kWh £302 £163 £465 £6,104 13.1 yrs £3,201
4 kW 3630 kWh 1452 kWh 2178 kWh £402 £218 £620 £8,138 13.1 yrs £4,268
5 kW 4538 kWh 1815 kWh 2723 kWh £503 £272 £775 £10,173 13.1 yrs £5,335
6 kW 5445 kWh 2178 kWh 3267 kWh £604 £327 £930 £12,207 13.1 yrs £6,402
7 kW 6353 kWh 2541 kWh 3812 kWh £704 £381 £1,086 £14,242 13.1 yrs £7,469
8 kW 7260 kWh 2904 kWh 4356 kWh £805 £436 £1,241 £16,276 13.1 yrs £8,536

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: £936, 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 1815 kWh 1089 kWh 726 kWh £302 £73 £374 £6,169 16.5 yrs £1,320
3 kW 2723 kWh 1634 kWh 1089 kWh £453 £109 £562 £8,204 14.6 yrs £3,031
4 kW 3630 kWh 2178 kWh 1452 kWh £604 £145 £749 £10,238 13.7 yrs £4,741
5 kW 4538 kWh 2723 kWh 1815 kWh £755 £182 £936 £12,273 13.1 yrs £6,451
6 kW 5445 kWh 3267 kWh 2178 kWh £906 £218 £1,123 £14,307 12.7 yrs £8,161
7 kW 6353 kWh 3812 kWh 2541 kWh £1,057 £254 £1,311 £16,342 12.5 yrs £9,872
8 kW 7260 kWh 4356 kWh 2904 kWh £1,207 £290 £1,498 £18,376 12.3 yrs £11,582

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: £1,017, Upfront: £13,673, Break-even: 13.4 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1815 kWh 1271 kWh 545 kWh £352 £54 £407 £7,569 18.6 yrs £564
3 kW 2723 kWh 1906 kWh 817 kWh £528 £82 £610 £9,604 15.7 yrs £2,596
4 kW 3630 kWh 2541 kWh 1089 kWh £704 £109 £813 £11,638 14.3 yrs £4,627
5 kW 4538 kWh 3176 kWh 1361 kWh £880 £136 £1,017 £13,673 13.4 yrs £6,659
6 kW 5445 kWh 3812 kWh 1634 kWh £1,057 £163 £1,220 £15,707 12.9 yrs £8,691
7 kW 6353 kWh 4447 kWh 1906 kWh £1,233 £191 £1,423 £17,742 12.5 yrs £10,723
8 kW 7260 kWh 5082 kWh 2178 kWh £1,409 £218 £1,627 £19,776 12.2 yrs £12,755

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: £1,041, 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 1815 kWh 1325 kWh 490 kWh £367 £49 £416 £9,319 22.4 yrs £-993
3 kW 2723 kWh 1987 kWh 735 kWh £551 £74 £624 £11,354 18.2 yrs £1,135
4 kW 3630 kWh 2650 kWh 980 kWh £735 £98 £833 £13,388 16.1 yrs £3,263
5 kW 4538 kWh 3312 kWh 1225 kWh £918 £123 £1,041 £15,423 14.8 yrs £5,392
6 kW 5445 kWh 3975 kWh 1470 kWh £1,102 £147 £1,249 £17,457 14.0 yrs £7,520
7 kW 6353 kWh 4637 kWh 1715 kWh £1,285 £172 £1,457 £19,492 13.4 yrs £9,648
8 kW 7260 kWh 5300 kWh 1960 kWh £1,469 £196 £1,665 £21,526 12.9 yrs £11,777

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: £1,057, Upfront: £17,173, Break-even: 16.2 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1815 kWh 1361 kWh 454 kWh £377 £45 £423 £11,069 26.2 yrs £-2,615
3 kW 2723 kWh 2042 kWh 681 kWh £566 £68 £634 £13,104 20.7 yrs £-422
4 kW 3630 kWh 2723 kWh 908 kWh £755 £91 £845 £15,138 17.9 yrs £1,771
5 kW 4538 kWh 3403 kWh 1134 kWh £943 £113 £1,057 £17,173 16.2 yrs £3,963
6 kW 5445 kWh 4084 kWh 1361 kWh £1,132 £136 £1,268 £19,207 15.1 yrs £6,156
7 kW 6353 kWh 4764 kWh 1588 kWh £1,321 £159 £1,480 £21,242 14.4 yrs £8,349
8 kW 7260 kWh 5445 kWh 1815 kWh £1,509 £182 £1,691 £23,276 13.8 yrs £10,541

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: £1,073, 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 1815 kWh 1398 kWh 417 kWh £387 £42 £429 £13,519 31.5 yrs £-4,936
3 kW 2723 kWh 2096 kWh 626 kWh £581 £63 £644 £15,554 24.2 yrs £-2,679
4 kW 3630 kWh 2795 kWh 835 kWh £775 £83 £858 £17,588 20.5 yrs £-422
5 kW 4538 kWh 3494 kWh 1044 kWh £969 £104 £1,073 £19,623 18.3 yrs £1,835
6 kW 5445 kWh 4193 kWh 1252 kWh £1,162 £125 £1,287 £21,657 16.8 yrs £4,092
7 kW 6353 kWh 4891 kWh 1461 kWh £1,356 £146 £1,502 £23,692 15.8 yrs £6,349
8 kW 7260 kWh 5590 kWh 1670 kWh £1,550 £167 £1,717 £25,726 15.0 yrs £8,606

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 LL31

Figures below are tailored to LL31 — click through for full league tables.

Big-Roof Britain Rank #723 of 2182
5.3 kWp (UK avg 5.1 kWp)
~11 panels (≈430 W)
Solar Payback Index Rank #1703 of 2997
11.4 years (UK avg 11.3 years)
~£896 /yr • £10,173 upfront
Standing-Charge Drag Rank #2600 of 2997
28.5% (UK avg 21.7%) drag on savings
£255 fixed • ~£896 /yr value

Your Area at a Glance

Your Electricity Rate
27.72p/kWh
Daily Fixed Charge
69.95p/day
Local Sunshine
908kWh/kW
A 1 kW system generates ~908 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: 66% • Flats: 17% • Bungalows: 15% Based on 2,735 properties

Coverage

Conwy (100%)

Areas Covered

Glyn y Marl, Deganwy, Penrhyn, Tudno, Llansanffraid

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

LL32 (Conwy)
≈2.5 km away
Local sunshine: ~906 kWh/kWp · -0% vs LL31
LL30 (Conwy)
≈3.2 km away
Local sunshine: ~919 kWh/kWp · +1% vs LL31
LL28 (Conwy)
≈4.0 km away
Local sunshine: ~900 kWh/kWp · -1% vs LL31
LL29 (Conwy)
≈5.8 km away
Local sunshine: ~923 kWh/kWp · +2% vs LL31
LL34 (Conwy)
≈7.5 km away
Local sunshine: ~871 kWh/kWp · -4% vs LL31
LL33 (Conwy)
≈11.7 km away
Local sunshine: ~886 kWh/kWp · -2% vs LL31

Similar sunshine across the UK

DD5 (Dundee City)
~907 kWh/kWp · -0% vs LL31
SR3 (Sunderland)
~907 kWh/kWp · -0% vs LL31
BD99 (Bradford)
~908 kWh/kWp · +0% vs LL31