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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in LL25 (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
14.5 years
After this, it's pure profit
Upfront Cost
£10,173
What you pay to get started
Annual Benefit
£704
What you save every year
Profit Over 25 Years
£7,416
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 823 kWh/kW — 107 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 823 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)
823 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: £704, Upfront: £10,173, 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 1647 kWh 659 kWh 988 kWh £183 £99 £281 £4,069 14.5 yrs £1,559
3 kW 2470 kWh 988 kWh 1482 kWh £274 £148 £422 £6,104 14.5 yrs £2,339
4 kW 3294 kWh 1317 kWh 1976 kWh £365 £198 £563 £8,138 14.5 yrs £3,119
5 kW 4117 kWh 1647 kWh 2470 kWh £457 £247 £704 £10,173 14.5 yrs £3,898
6 kW 4941 kWh 1976 kWh 2964 kWh £548 £296 £844 £12,207 14.5 yrs £4,678
7 kW 5764 kWh 2306 kWh 3458 kWh £639 £346 £985 £14,242 14.5 yrs £5,458
8 kW 6587 kWh 2635 kWh 3952 kWh £730 £395 £1,126 £16,276 14.5 yrs £6,237

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: £849, Upfront: £12,273, Break-even: 14.4 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1647 kWh 988 kWh 659 kWh £274 £66 £340 £6,169 18.2 yrs £627
3 kW 2470 kWh 1482 kWh 988 kWh £411 £99 £510 £8,204 16.1 yrs £1,990
4 kW 3294 kWh 1976 kWh 1317 kWh £548 £132 £680 £10,238 15.1 yrs £3,353
5 kW 4117 kWh 2470 kWh 1647 kWh £685 £165 £849 £12,273 14.4 yrs £4,716
6 kW 4941 kWh 2964 kWh 1976 kWh £822 £198 £1,019 £14,307 14.0 yrs £6,080
7 kW 5764 kWh 3458 kWh 2306 kWh £959 £231 £1,189 £16,342 13.7 yrs £7,443
8 kW 6587 kWh 3952 kWh 2635 kWh £1,096 £263 £1,359 £18,376 13.5 yrs £8,806

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: £922, Upfront: £13,673, 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 1647 kWh 1153 kWh 494 kWh £320 £49 £369 £7,569 20.5 yrs £-190
3 kW 2470 kWh 1729 kWh 741 kWh £479 £74 £553 £9,604 17.4 yrs £1,465
4 kW 3294 kWh 2306 kWh 988 kWh £639 £99 £738 £11,638 15.8 yrs £3,120
5 kW 4117 kWh 2882 kWh 1235 kWh £799 £124 £922 £13,673 14.8 yrs £4,776
6 kW 4941 kWh 3458 kWh 1482 kWh £959 £148 £1,107 £15,707 14.2 yrs £6,431
7 kW 5764 kWh 4035 kWh 1729 kWh £1,118 £173 £1,291 £17,742 13.7 yrs £8,086
8 kW 6587 kWh 4611 kWh 1976 kWh £1,278 £198 £1,476 £19,776 13.4 yrs £9,741

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: £944, Upfront: £15,423, 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 1647 kWh 1202 kWh 445 kWh £333 £44 £378 £9,319 24.7 yrs £-1,765
3 kW 2470 kWh 1803 kWh 667 kWh £500 £67 £567 £11,354 20.0 yrs £-22
4 kW 3294 kWh 2404 kWh 889 kWh £667 £89 £755 £13,388 17.7 yrs £1,721
5 kW 4117 kWh 3006 kWh 1112 kWh £833 £111 £944 £15,423 16.3 yrs £3,463
6 kW 4941 kWh 3607 kWh 1334 kWh £1,000 £133 £1,133 £17,457 15.4 yrs £5,206
7 kW 5764 kWh 4208 kWh 1556 kWh £1,166 £156 £1,322 £19,492 14.7 yrs £6,949
8 kW 6587 kWh 4809 kWh 1779 kWh £1,333 £178 £1,511 £21,526 14.2 yrs £8,691

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: £959, Upfront: £17,173, Break-even: 17.9 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1647 kWh 1235 kWh 412 kWh £342 £41 £384 £11,069 28.9 yrs £-3,398
3 kW 2470 kWh 1853 kWh 618 kWh £514 £62 £575 £13,104 22.8 yrs £-1,597
4 kW 3294 kWh 2470 kWh 823 kWh £685 £82 £767 £15,138 19.7 yrs £204
5 kW 4117 kWh 3088 kWh 1029 kWh £856 £103 £959 £17,173 17.9 yrs £2,005
6 kW 4941 kWh 3705 kWh 1235 kWh £1,027 £124 £1,151 £19,207 16.7 yrs £3,806
7 kW 5764 kWh 4323 kWh 1441 kWh £1,198 £144 £1,342 £21,242 15.8 yrs £5,607
8 kW 6587 kWh 4941 kWh 1647 kWh £1,370 £165 £1,534 £23,276 15.2 yrs £7,408

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: £973, Upfront: £19,623, Break-even: 20.2 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1647 kWh 1268 kWh 379 kWh £352 £38 £389 £13,519 34.7 yrs £-5,731
3 kW 2470 kWh 1902 kWh 568 kWh £527 £57 £584 £15,554 26.6 yrs £-3,872
4 kW 3294 kWh 2536 kWh 758 kWh £703 £76 £779 £17,588 22.6 yrs £-2,012
5 kW 4117 kWh 3170 kWh 947 kWh £879 £95 £973 £19,623 20.2 yrs £-153
6 kW 4941 kWh 3804 kWh 1136 kWh £1,055 £114 £1,168 £21,657 18.5 yrs £1,706
7 kW 5764 kWh 4438 kWh 1326 kWh £1,230 £133 £1,363 £23,692 17.4 yrs £3,566
8 kW 6587 kWh 5072 kWh 1515 kWh £1,406 £152 £1,558 £25,726 16.5 yrs £5,425

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 LL25

Figures below are tailored to LL25 — click through for full league tables.

Big-Roof Britain Rank #981 of 2182
5.1 kWp (UK avg 5.1 kWp)
~11 panels (≈430 W)
Solar Payback Index Rank #2647 of 2997
12.5 years (UK avg 11.3 years)
~£813 /yr • £10,173 upfront
Standing-Charge Drag Rank #2678 of 2997
31.4% (UK avg 21.7%) drag on savings
£255 fixed • ~£813 /yr value

Your Area at a Glance

Your Electricity Rate
27.72p/kWh
Daily Fixed Charge
69.95p/day
Local Sunshine
823kWh/kW
A 1 kW system generates ~823 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: 95% • Flats: 0% • Bungalows: 5% Based on 165 properties

Coverage

Conwy (100%)

Areas Covered

Betws-y-Coed and Trefriw, Uwch Conwy

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

LL24 (Conwy)
≈5.7 km away
Local sunshine: ~811 kWh/kWp · -2% vs LL25
LL41 (Gwynedd)
≈7.9 km away
Local sunshine: ~808 kWh/kWp · -2% vs LL25
LL26 (Conwy)
≈11.4 km away
Local sunshine: ~870 kWh/kWp · +6% vs LL25
LL27 (Conwy)
≈11.6 km away
Local sunshine: ~777 kWh/kWp · -6% vs LL25
LL48 (Gwynedd)
≈18.2 km away
Local sunshine: ~812 kWh/kWp · -1% vs LL25
LL47 (Gwynedd)
≈20.7 km away
Local sunshine: ~795 kWh/kWp · -3% vs LL25

Similar sunshine across the UK

PH6 (Perth and Kinross)
~824 kWh/kWp · +0% vs LL25
PH9 (Perth and Kinross)
~824 kWh/kWp · +0% vs LL25
KW8 (Highland)
~823 kWh/kWp · -0% vs LL25