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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in LL24 (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
14.7 years
After this, it's pure profit
Upfront Cost
£10,173
What you pay to get started
Annual Benefit
£693
What you save every year
Profit Over 25 Years
£7,143
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 811 kWh/kW — 119 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 811 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)
811 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: £693, Upfront: £10,173, 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 1621 kWh 649 kWh 973 kWh £180 £97 £277 £4,069 14.7 yrs £1,472
3 kW 2432 kWh 973 kWh 1459 kWh £270 £146 £416 £6,104 14.7 yrs £2,208
4 kW 3243 kWh 1297 kWh 1946 kWh £360 £195 £554 £8,138 14.7 yrs £2,944
5 kW 4053 kWh 1621 kWh 2432 kWh £449 £243 £693 £10,173 14.7 yrs £3,679
6 kW 4864 kWh 1946 kWh 2918 kWh £539 £292 £831 £12,207 14.7 yrs £4,415
7 kW 5674 kWh 2270 kWh 3405 kWh £629 £340 £970 £14,242 14.7 yrs £5,151
8 kW 6485 kWh 2594 kWh 3891 kWh £719 £389 £1,108 £16,276 14.7 yrs £5,887

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: £836, 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 1621 kWh 973 kWh 649 kWh £270 £65 £334 £6,169 18.4 yrs £521
3 kW 2432 kWh 1459 kWh 973 kWh £404 £97 £502 £8,204 16.3 yrs £1,831
4 kW 3243 kWh 1946 kWh 1297 kWh £539 £130 £669 £10,238 15.3 yrs £3,142
5 kW 4053 kWh 2432 kWh 1621 kWh £674 £162 £836 £12,273 14.7 yrs £4,452
6 kW 4864 kWh 2918 kWh 1946 kWh £809 £195 £1,003 £14,307 14.3 yrs £5,763
7 kW 5674 kWh 3405 kWh 2270 kWh £944 £227 £1,171 £16,342 14.0 yrs £7,073
8 kW 6485 kWh 3891 kWh 2594 kWh £1,079 £259 £1,338 £18,376 13.7 yrs £8,384

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: £908, 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 1621 kWh 1135 kWh 486 kWh £315 £49 £363 £7,569 20.8 yrs £-304
3 kW 2432 kWh 1702 kWh 730 kWh £472 £73 £545 £9,604 17.6 yrs £1,293
4 kW 3243 kWh 2270 kWh 973 kWh £629 £97 £726 £11,638 16.0 yrs £2,891
5 kW 4053 kWh 2837 kWh 1216 kWh £786 £122 £908 £13,673 15.1 yrs £4,489
6 kW 4864 kWh 3405 kWh 1459 kWh £944 £146 £1,090 £15,707 14.4 yrs £6,087
7 kW 5674 kWh 3972 kWh 1702 kWh £1,101 £170 £1,271 £17,742 14.0 yrs £7,684
8 kW 6485 kWh 4540 kWh 1946 kWh £1,258 £195 £1,453 £19,776 13.6 yrs £9,282

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: £930, Upfront: £15,423, Break-even: 16.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1621 kWh 1184 kWh 438 kWh £328 £44 £372 £9,319 25.1 yrs £-1,882
3 kW 2432 kWh 1775 kWh 657 kWh £492 £66 £558 £11,354 20.4 yrs £-198
4 kW 3243 kWh 2367 kWh 875 kWh £656 £88 £744 £13,388 18.0 yrs £1,486
5 kW 4053 kWh 2959 kWh 1094 kWh £820 £109 £930 £15,423 16.6 yrs £3,170
6 kW 4864 kWh 3551 kWh 1313 kWh £984 £131 £1,116 £17,457 15.6 yrs £4,854
7 kW 5674 kWh 4142 kWh 1532 kWh £1,148 £153 £1,301 £19,492 15.0 yrs £6,538
8 kW 6485 kWh 4734 kWh 1751 kWh £1,312 £175 £1,487 £21,526 14.5 yrs £8,222

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: £944, Upfront: £17,173, Break-even: 18.2 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1621 kWh 1216 kWh 405 kWh £337 £41 £378 £11,069 29.3 yrs £-3,517
3 kW 2432 kWh 1824 kWh 608 kWh £506 £61 £566 £13,104 23.1 yrs £-1,776
4 kW 3243 kWh 2432 kWh 811 kWh £674 £81 £755 £15,138 20.0 yrs £-34
5 kW 4053 kWh 3040 kWh 1013 kWh £843 £101 £944 £17,173 18.2 yrs £1,707
6 kW 4864 kWh 3648 kWh 1216 kWh £1,011 £122 £1,133 £19,207 17.0 yrs £3,448
7 kW 5674 kWh 4256 kWh 1419 kWh £1,180 £142 £1,322 £21,242 16.1 yrs £5,190
8 kW 6485 kWh 4864 kWh 1621 kWh £1,348 £162 £1,510 £23,276 15.4 yrs £6,931

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: £958, Upfront: £19,623, Break-even: 20.5 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1621 kWh 1248 kWh 373 kWh £346 £37 £383 £13,519 35.3 yrs £-5,852
3 kW 2432 kWh 1873 kWh 559 kWh £519 £56 £575 £15,554 27.0 yrs £-4,053
4 kW 3243 kWh 2497 kWh 746 kWh £692 £75 £767 £17,588 22.9 yrs £-2,255
5 kW 4053 kWh 3121 kWh 932 kWh £865 £93 £958 £19,623 20.5 yrs £-456
6 kW 4864 kWh 3745 kWh 1119 kWh £1,038 £112 £1,150 £21,657 18.8 yrs £1,343
7 kW 5674 kWh 4369 kWh 1305 kWh £1,211 £131 £1,342 £23,692 17.7 yrs £3,142
8 kW 6485 kWh 4993 kWh 1492 kWh £1,384 £149 £1,533 £25,726 16.8 yrs £4,941

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 LL24

Figures below are tailored to LL24 — click through for full league tables.

Big-Roof Britain Rank #549 of 2182
5.5 kWp (UK avg 5.1 kWp)
~12 panels (≈430 W)
Solar Payback Index Rank #2708 of 2997
12.7 years (UK avg 11.3 years)
~£800 /yr • £10,173 upfront
Standing-Charge Drag Rank #2711 of 2997
31.9% (UK avg 21.7%) drag on savings
£255 fixed • ~£800 /yr value

Your Area at a Glance

Your Electricity Rate
27.72p/kWh
Daily Fixed Charge
69.95p/day
Local Sunshine
811kWh/kW
A 1 kW system generates ~811 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: 86% • Flats: 1% • Bungalows: 12% Based on 675 properties

Coverage

Conwy (100%)

Areas Covered

Uwch Conwy, Betws-y-Coed and Trefriw, Uwch Aled, Llanrwst a Llanddoged

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

LL25 (Conwy)
≈5.7 km away
Local sunshine: ~823 kWh/kWp · +2% vs LL24
LL26 (Conwy)
≈10.0 km away
Local sunshine: ~870 kWh/kWp · +7% vs LL24
LL41 (Gwynedd)
≈11.2 km away
Local sunshine: ~808 kWh/kWp · -0% vs LL24
LL27 (Conwy)
≈11.4 km away
Local sunshine: ~777 kWh/kWp · -4% vs LL24
LL23 (Gwynedd)
≈20.7 km away
Local sunshine: ~860 kWh/kWp · +6% vs LL24
LL48 (Gwynedd)
≈22.1 km away
Local sunshine: ~812 kWh/kWp · +0% vs LL24

Similar sunshine across the UK

ML12 (South Lanarkshire)
~811 kWh/kWp · +0% vs LL24
ML7 (North Lanarkshire)
~810 kWh/kWp · -0% vs LL24
LA21 (Westmorland and Furness)
~810 kWh/kWp · -0% vs LL24