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Solar panel cost in Gwynedd (LL48)

See realistic solar installation costs, savings and payback for LL48 (Gwynedd) 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
15.9 years
After this, it's pure profit
Upfront Cost
£10,173
What you pay to get started
Annual Benefit
£640
What you save every year
Profit Over 25 Years
£5,839
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 812 kWh/kW — 118 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 812 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)
812 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: £640, Upfront: £10,173, Break-even: 15.9 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1624 kWh 650 kWh 975 kWh £159 £97 £256 £4,069 15.9 yrs £1,055
3 kW 2437 kWh 975 kWh 1462 kWh £238 £146 £384 £6,104 15.9 yrs £1,582
4 kW 3249 kWh 1299 kWh 1949 kWh £317 £195 £512 £8,138 15.9 yrs £2,110
5 kW 4061 kWh 1624 kWh 2437 kWh £397 £244 £640 £10,173 15.9 yrs £2,637
6 kW 4873 kWh 1949 kWh 2924 kWh £476 £292 £769 £12,207 15.9 yrs £3,164
7 kW 5685 kWh 2274 kWh 3411 kWh £556 £341 £897 £14,242 15.9 yrs £3,692
8 kW 6497 kWh 2599 kWh 3898 kWh £635 £390 £1,025 £16,276 15.9 yrs £4,219

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: £758, Upfront: £12,273, 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 1624 kWh 975 kWh 650 kWh £238 £65 £303 £6,169 20.4 yrs £-108
3 kW 2437 kWh 1462 kWh 975 kWh £357 £97 £455 £8,204 18.0 yrs £889
4 kW 3249 kWh 1949 kWh 1299 kWh £476 £130 £606 £10,238 16.9 yrs £1,885
5 kW 4061 kWh 2437 kWh 1624 kWh £595 £162 £758 £12,273 16.2 yrs £2,881
6 kW 4873 kWh 2924 kWh 1949 kWh £714 £195 £909 £14,307 15.7 yrs £3,877
7 kW 5685 kWh 3411 kWh 2274 kWh £833 £227 £1,061 £16,342 15.4 yrs £4,873
8 kW 6497 kWh 3898 kWh 2599 kWh £952 £260 £1,212 £18,376 15.2 yrs £5,869

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: £816, Upfront: £13,673, Break-even: 16.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1624 kWh 1137 kWh 487 kWh £278 £49 £327 £7,569 23.2 yrs £-1,039
3 kW 2437 kWh 1706 kWh 731 kWh £417 £73 £490 £9,604 19.6 yrs £192
4 kW 3249 kWh 2274 kWh 975 kWh £556 £97 £653 £11,638 17.8 yrs £1,422
5 kW 4061 kWh 2843 kWh 1218 kWh £694 £122 £816 £13,673 16.8 yrs £2,653
6 kW 4873 kWh 3411 kWh 1462 kWh £833 £146 £980 £15,707 16.0 yrs £3,883
7 kW 5685 kWh 3980 kWh 1706 kWh £972 £171 £1,143 £17,742 15.5 yrs £5,114
8 kW 6497 kWh 4548 kWh 1949 kWh £1,111 £195 £1,306 £19,776 15.1 yrs £6,345

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: £834, Upfront: £15,423, Break-even: 18.5 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1624 kWh 1186 kWh 439 kWh £290 £44 £334 £9,319 27.9 yrs £-2,648
3 kW 2437 kWh 1779 kWh 658 kWh £435 £66 £500 £11,354 22.7 yrs £-1,347
4 kW 3249 kWh 2372 kWh 877 kWh £579 £88 £667 £13,388 20.1 yrs £-46
5 kW 4061 kWh 2964 kWh 1096 kWh £724 £110 £834 £15,423 18.5 yrs £1,254
6 kW 4873 kWh 3557 kWh 1316 kWh £869 £132 £1,001 £17,457 17.4 yrs £2,555
7 kW 5685 kWh 4150 kWh 1535 kWh £1,014 £154 £1,167 £19,492 16.7 yrs £3,856
8 kW 6497 kWh 4743 kWh 1754 kWh £1,159 £175 £1,334 £21,526 16.1 yrs £5,157

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: £846, Upfront: £17,173, Break-even: 20.3 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1624 kWh 1218 kWh 406 kWh £298 £41 £338 £11,069 32.7 yrs £-4,304
3 kW 2437 kWh 1827 kWh 609 kWh £446 £61 £507 £13,104 25.8 yrs £-2,957
4 kW 3249 kWh 2437 kWh 812 kWh £595 £81 £676 £15,138 22.4 yrs £-1,609
5 kW 4061 kWh 3046 kWh 1015 kWh £744 £102 £846 £17,173 20.3 yrs £-261
6 kW 4873 kWh 3655 kWh 1218 kWh £893 £122 £1,015 £19,207 18.9 yrs £1,087
7 kW 5685 kWh 4264 kWh 1421 kWh £1,042 £142 £1,184 £21,242 17.9 yrs £2,434
8 kW 6497 kWh 4873 kWh 1624 kWh £1,190 £162 £1,353 £23,276 17.2 yrs £3,782

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: £857, Upfront: £19,623, Break-even: 22.9 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1624 kWh 1251 kWh 374 kWh £306 £37 £343 £13,519 39.4 yrs £-6,661
3 kW 2437 kWh 1876 kWh 560 kWh £458 £56 £514 £15,554 30.2 yrs £-5,266
4 kW 3249 kWh 2501 kWh 747 kWh £611 £75 £686 £17,588 25.6 yrs £-3,871
5 kW 4061 kWh 3127 kWh 934 kWh £764 £93 £857 £19,623 22.9 yrs £-2,477
6 kW 4873 kWh 3752 kWh 1121 kWh £917 £112 £1,029 £21,657 21.1 yrs £-1,082
7 kW 5685 kWh 4378 kWh 1308 kWh £1,069 £131 £1,200 £23,692 19.7 yrs £313
8 kW 6497 kWh 5003 kWh 1494 kWh £1,222 £149 £1,372 £25,726 18.8 yrs £1,707

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 LL48

Figures below are tailored to LL48 — click through for full league tables.

Big-Roof Britain Rank #1003 of 2182
5.1 kWp (UK avg 5.1 kWp)
~11 panels (≈430 W)
Solar Payback Index Rank #2724 of 2997
14.2 years (UK avg 12.6 years)
~£716 /yr • £10,173 upfront
Standing-Charge Drag Rank #2719 of 2997
36.2% (UK avg 24.6%) drag on savings
£259 fixed • ~£716 /yr value
Aspect Penalty View ranking →
East −17.3% West −18.9%
Typical output loss versus a south-facing roof (lower is better)

Seasonal solar output in LL48

Monthly generation per kilowatt of solar panels

kWh 24 Jan 39 Feb 72 Mar 101 Apr 110 May 107 Jun 102 Jul 87 Aug 72 Sep 48 Oct 30 Nov 19 Dec
Best month Worst month Winter (Dec–Feb) Other months

Winter output: 41.0% 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 28 kWh per month; the average month produces around 68 kWh. So a typical 4 kW home system would generate roughly 111 kWh in winter, or 271 kWh in an average month.

Your Area at a Glance

Your Electricity Rate
24.43p/kWh
Daily Fixed Charge
69.98p/day
Local Sunshine
812kWh/kW
A 1 kW system generates ~812 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: 80% • Flats: 5% • Bungalows: 14% Based on 684 properties

Coverage

Gwynedd (100%)

Areas Covered

Penrhyndeudraeth, Glaslyn, Gorllewin Porthmadog, Harlech a Llanbedr

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

LL47 (Gwynedd)
≈3.5 km away
Local sunshine: ~795 kWh/kWp · -2% vs LL48
LL49 (Gwynedd)
≈4.5 km away
Local sunshine: ~827 kWh/kWp · +2% vs LL48
LL46 (Gwynedd)
≈8.7 km away
Local sunshine: ~830 kWh/kWp · +2% vs LL48
LL41 (Gwynedd)
≈10.9 km away
Local sunshine: ~808 kWh/kWp · -1% vs LL48
LL52 (Gwynedd)
≈11.3 km away
Local sunshine: ~934 kWh/kWp · +15% vs LL48
LL51 (Gwynedd)
≈12.3 km away
Local sunshine: ~896 kWh/kWp · +10% vs LL48

Similar sunshine across the UK

CA13 (Cumberland)
~812 kWh/kWp · +0% vs LL48
HS5 (Na h-Eileanan Siar)
~812 kWh/kWp · -0% vs LL48
KA17 (East Ayrshire)
~813 kWh/kWp · +0% vs LL48