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Solar panel cost in Conwy (LL25)

See realistic solar installation costs, savings and payback for LL25 (Conwy) in under a minute using official UK data. Start with the calculator, then get a no-obligation quote from an MCS-certified installer. You can also ask the SolarByPostcode assistant to sanity-check your roof, bills and plans.

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
15.7 years
After this, it's pure profit
Upfront Cost
£10,173
What you pay to get started
Annual Benefit
£649
What you save every year
Profit Over 25 Years
£6,061
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 24.43p/kWh with a 69.98p/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 24.4p and exported surplus at a baseline 10p via SEG. Use the calculator above for your exact tariff.

Unit rate
24.4p/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: £649, Upfront: £10,173, Break-even: 15.7 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 £161 £99 £260 £4,069 15.7 yrs £1,126
3 kW 2470 kWh 988 kWh 1482 kWh £241 £148 £390 £6,104 15.7 yrs £1,689
4 kW 3294 kWh 1317 kWh 1976 kWh £322 £198 £519 £8,138 15.7 yrs £2,252
5 kW 4117 kWh 1647 kWh 2470 kWh £402 £247 £649 £10,173 15.7 yrs £2,815
6 kW 4941 kWh 1976 kWh 2964 kWh £483 £296 £779 £12,207 15.7 yrs £3,378
7 kW 5764 kWh 2306 kWh 3458 kWh £563 £346 £909 £14,242 15.7 yrs £3,940
8 kW 6587 kWh 2635 kWh 3952 kWh £644 £395 £1,039 £16,276 15.7 yrs £4,503

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: £768, Upfront: £12,273, 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 1647 kWh 988 kWh 659 kWh £241 £66 £307 £6,169 20.1 yrs £-24
3 kW 2470 kWh 1482 kWh 988 kWh £362 £99 £461 £8,204 17.8 yrs £1,015
4 kW 3294 kWh 1976 kWh 1317 kWh £483 £132 £615 £10,238 16.7 yrs £2,053
5 kW 4117 kWh 2470 kWh 1647 kWh £603 £165 £768 £12,273 16.0 yrs £3,091
6 kW 4941 kWh 2964 kWh 1976 kWh £724 £198 £922 £14,307 15.5 yrs £4,129
7 kW 5764 kWh 3458 kWh 2306 kWh £845 £231 £1,075 £16,342 15.2 yrs £5,167
8 kW 6587 kWh 3952 kWh 2635 kWh £966 £263 £1,229 £18,376 15.0 yrs £6,206

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: £828, Upfront: £13,673, Break-even: 16.5 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1647 kWh 1153 kWh 494 kWh £282 £49 £331 £7,569 22.9 yrs £-948
3 kW 2470 kWh 1729 kWh 741 kWh £422 £74 £497 £9,604 19.3 yrs £328
4 kW 3294 kWh 2306 kWh 988 kWh £563 £99 £662 £11,638 17.6 yrs £1,603
5 kW 4117 kWh 2882 kWh 1235 kWh £704 £124 £828 £13,673 16.5 yrs £2,879
6 kW 4941 kWh 3458 kWh 1482 kWh £845 £148 £993 £15,707 15.8 yrs £4,155
7 kW 5764 kWh 4035 kWh 1729 kWh £986 £173 £1,159 £17,742 15.3 yrs £5,431
8 kW 6587 kWh 4611 kWh 1976 kWh £1,127 £198 £1,324 £19,776 14.9 yrs £6,707

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: £845, Upfront: £15,423, 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 1647 kWh 1202 kWh 445 kWh £294 £44 £338 £9,319 27.6 yrs £-2,556
3 kW 2470 kWh 1803 kWh 667 kWh £441 £67 £507 £11,354 22.4 yrs £-1,209
4 kW 3294 kWh 2404 kWh 889 kWh £587 £89 £676 £13,388 19.8 yrs £139
5 kW 4117 kWh 3006 kWh 1112 kWh £734 £111 £845 £15,423 18.2 yrs £1,486
6 kW 4941 kWh 3607 kWh 1334 kWh £881 £133 £1,014 £17,457 17.2 yrs £2,833
7 kW 5764 kWh 4208 kWh 1556 kWh £1,028 £156 £1,184 £19,492 16.5 yrs £4,180
8 kW 6587 kWh 4809 kWh 1779 kWh £1,175 £178 £1,353 £21,526 15.9 yrs £5,527

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: £857, Upfront: £17,173, Break-even: 20.0 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 £302 £41 £343 £11,069 32.3 yrs £-4,211
3 kW 2470 kWh 1853 kWh 618 kWh £453 £62 £514 £13,104 25.5 yrs £-2,816
4 kW 3294 kWh 2470 kWh 823 kWh £603 £82 £686 £15,138 22.1 yrs £-1,421
5 kW 4117 kWh 3088 kWh 1029 kWh £754 £103 £857 £17,173 20.0 yrs £-27
6 kW 4941 kWh 3705 kWh 1235 kWh £905 £124 £1,029 £19,207 18.7 yrs £1,368
7 kW 5764 kWh 4323 kWh 1441 kWh £1,056 £144 £1,200 £21,242 17.7 yrs £2,763
8 kW 6587 kWh 4941 kWh 1647 kWh £1,207 £165 £1,372 £23,276 17.0 yrs £4,157

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: £869, Upfront: £19,623, Break-even: 22.6 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 £310 £38 £348 £13,519 38.9 yrs £-6,566
3 kW 2470 kWh 1902 kWh 568 kWh £465 £57 £522 £15,554 29.8 yrs £-5,123
4 kW 3294 kWh 2536 kWh 758 kWh £620 £76 £695 £17,588 25.3 yrs £-3,681
5 kW 4117 kWh 3170 kWh 947 kWh £774 £95 £869 £19,623 22.6 yrs £-2,239
6 kW 4941 kWh 3804 kWh 1136 kWh £929 £114 £1,043 £21,657 20.8 yrs £-797
7 kW 5764 kWh 4438 kWh 1326 kWh £1,084 £133 £1,217 £23,692 19.5 yrs £645
8 kW 6587 kWh 5072 kWh 1515 kWh £1,239 £152 £1,391 £25,726 18.5 yrs £2,088

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 #2667 of 2997
14.0 years (UK avg 12.6 years)
~£726 /yr • £10,173 upfront
Standing-Charge Drag Rank #2692 of 2997
35.7% (UK avg 24.6%) drag on savings
£259 fixed • ~£726 /yr value
Aspect Penalty View ranking →
East −18.0% West −19.5%
Typical output loss versus a south-facing roof (lower is better)

Seasonal solar output in LL25

Monthly generation per kilowatt of solar panels

kWh 23 Jan 38 Feb 73 Mar 102 Apr 111 May 107 Jun 105 Jul 91 Aug 76 Sep 50 Oct 30 Nov 18 Dec
Best month Worst month Winter (Dec–Feb) Other months

Winter output: 38.2% of an average month (Dec–Feb)

Best / worst month: May / Dec

These figures show output per kilowatt (kW) of panels installed. In winter, a 1 kW system here produces about 26 kWh per month; the average month produces around 69 kWh. So a typical 4 kW home system would generate roughly 105 kWh in winter, or 274 kWh in an average month.

Your Area at a Glance

Your Electricity Rate
24.43p/kWh
Daily Fixed Charge
69.98p/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, Q1 2026

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