Independent solar numbers for your postcode using official UK data
Home Regions Guides Compare quotes Solar assistant
Insights
Big Roof Britain Solar Payback Index Standing Charge Drag Roof Direction Penalty Winter Solar Reality Seasonal Solar Output

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
11.7 years
After this, it's pure profit
Upfront Cost
£8,139
What you pay to get started
Annual Benefit
£693
What you save every year
Profit Over 25 Years
£9,185
After paying itself off, you're this much ahead

Ready to Get Started?

Get your free quote from Blue Ape Renewables. They'll connect you with MCS-certified installers in your area and handle all the paperwork.

Get Solar Quote →
4.8★ Trustpilot • Octopus Energy trusted partner • MCS certified • No obligation
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: The official cost per kW is lower above 4 kW, so a 5–6 kW system can pay back a little faster than a 3–4 kW system on otherwise identical assumptions.
  • 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

Panel costs: Uses March 2026 TIC mean installation costs: £1,827/kW up to 4 kW and £1,628/kW above 4 kW.

Other costs: Battery prices are modelled at £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 27.66p/kWh with a 70.76p/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 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
70.8p/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: £693, Upfront: £8,139, Break-even: 11.7 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 £180 £97 £277 £3,256 11.7 yrs £2,288
3 kW 2437 kWh 975 kWh 1462 kWh £270 £146 £416 £4,883 11.7 yrs £3,432
4 kW 3249 kWh 1299 kWh 1949 kWh £359 £195 £554 £6,511 11.7 yrs £4,576
5 kW 4061 kWh 1624 kWh 2437 kWh £449 £244 £693 £8,139 11.7 yrs £5,720
6 kW 4873 kWh 1949 kWh 2924 kWh £539 £292 £832 £9,767 11.7 yrs £6,864
7 kW 5685 kWh 2274 kWh 3411 kWh £629 £341 £970 £11,394 11.7 yrs £8,008
8 kW 6497 kWh 2599 kWh 3898 kWh £719 £390 £1,109 £13,022 11.7 yrs £9,152

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,628, battery £/kWh = 700.

3 kWh battery 5 kW example → Annual benefit: £836, Upfront: £10,239, Break-even: 12.2 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 £270 £65 £335 £5,356 16.0 yrs £1,335
3 kW 2437 kWh 1462 kWh 975 kWh £404 £97 £502 £6,983 13.9 yrs £3,053
4 kW 3249 kWh 1949 kWh 1299 kWh £539 £130 £669 £8,611 12.9 yrs £4,771
5 kW 4061 kWh 2437 kWh 1624 kWh £674 £162 £836 £10,239 12.2 yrs £6,489
6 kW 4873 kWh 2924 kWh 1949 kWh £809 £195 £1,004 £11,867 11.8 yrs £8,206
7 kW 5685 kWh 3411 kWh 2274 kWh £944 £227 £1,171 £13,494 11.5 yrs £9,924
8 kW 6497 kWh 3898 kWh 2599 kWh £1,078 £260 £1,338 £15,122 11.3 yrs £11,642

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,628, battery £/kWh = 700.

5 kWh battery 5 kW example → Annual benefit: £908, Upfront: £11,639, Break-even: 12.8 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 £315 £49 £363 £6,756 18.6 yrs £509
3 kW 2437 kWh 1706 kWh 731 kWh £472 £73 £545 £8,383 15.4 yrs £2,514
4 kW 3249 kWh 2274 kWh 975 kWh £629 £97 £726 £10,011 13.8 yrs £4,518
5 kW 4061 kWh 2843 kWh 1218 kWh £786 £122 £908 £11,639 12.8 yrs £6,523
6 kW 4873 kWh 3411 kWh 1462 kWh £944 £146 £1,090 £13,267 12.2 yrs £8,528
7 kW 5685 kWh 3980 kWh 1706 kWh £1,101 £171 £1,271 £14,894 11.7 yrs £10,532
8 kW 6497 kWh 4548 kWh 1949 kWh £1,258 £195 £1,453 £16,522 11.4 yrs £12,537

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,628, battery £/kWh = 700.

7.5 kWh battery 5 kW example → Annual benefit: £930, Upfront: £13,389, 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 1624 kWh 1186 kWh 439 kWh £328 £44 £372 £8,506 22.9 yrs £-1,069
3 kW 2437 kWh 1779 kWh 658 kWh £492 £66 £558 £10,133 18.2 yrs £1,022
4 kW 3249 kWh 2372 kWh 877 kWh £656 £88 £744 £11,761 15.8 yrs £3,113
5 kW 4061 kWh 2964 kWh 1096 kWh £820 £110 £930 £13,389 14.4 yrs £5,203
6 kW 4873 kWh 3557 kWh 1316 kWh £984 £132 £1,116 £15,017 13.5 yrs £7,294
7 kW 5685 kWh 4150 kWh 1535 kWh £1,148 £154 £1,301 £16,644 12.8 yrs £9,385
8 kW 6497 kWh 4743 kWh 1754 kWh £1,312 £175 £1,487 £18,272 12.3 yrs £11,475

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,628, battery £/kWh = 700.

10 kWh battery 5 kW example → Annual benefit: £944, Upfront: £15,139, 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 1624 kWh 1218 kWh 406 kWh £337 £41 £378 £10,256 27.2 yrs £-2,704
3 kW 2437 kWh 1827 kWh 609 kWh £505 £61 £566 £11,883 21.0 yrs £-556
4 kW 3249 kWh 2437 kWh 812 kWh £674 £81 £755 £13,511 17.9 yrs £1,592
5 kW 4061 kWh 3046 kWh 1015 kWh £842 £102 £944 £15,139 16.0 yrs £3,740
6 kW 4873 kWh 3655 kWh 1218 kWh £1,011 £122 £1,133 £16,767 14.8 yrs £5,888
7 kW 5685 kWh 4264 kWh 1421 kWh £1,179 £142 £1,322 £18,394 13.9 yrs £8,036
8 kW 6497 kWh 4873 kWh 1624 kWh £1,348 £162 £1,510 £20,022 13.3 yrs £10,184

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,628, battery £/kWh = 700.

13.5 kWh battery 5 kW example → Annual benefit: £958, Upfront: £17,589, Break-even: 18.4 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 £346 £37 £383 £12,706 33.1 yrs £-5,039
3 kW 2437 kWh 1876 kWh 560 kWh £519 £56 £575 £14,333 24.9 yrs £-2,834
4 kW 3249 kWh 2501 kWh 747 kWh £692 £75 £767 £15,961 20.8 yrs £-628
5 kW 4061 kWh 3127 kWh 934 kWh £865 £93 £958 £17,589 18.4 yrs £1,577
6 kW 4873 kWh 3752 kWh 1121 kWh £1,038 £112 £1,150 £19,217 16.7 yrs £3,782
7 kW 5685 kWh 4378 kWh 1308 kWh £1,211 £131 £1,342 £20,844 15.5 yrs £5,988
8 kW 6497 kWh 5003 kWh 1494 kWh £1,384 £149 £1,533 £22,472 14.7 yrs £8,193

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,628, 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.

Before you request quotes in Gwynedd

Use the numbers above to sanity-check installer quotes. The main things to compare are system size, battery assumptions, payback claims, MCS certification, DNO paperwork and export assumptions.

Compare solar quotes before you sign

Check what MCS certification means

Understand DNO, G98 and G99 export limits

New quote check

Want a quote sanity check for LL48?

Share the first part of your postcode and a few basics. We’ll help you check whether system size, battery, export and paperwork assumptions look sensible before you commit to installer conversations.

This is a practical sanity-check request, not an instant quote promise. The Blue Ape quote route above remains available if you already want installer introductions.

Request a quote sanity check →

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 #2375 of 2996
11.7 years (UK avg 10.8 years)
~£693 /yr • £8,139 upfront
Standing-Charge Drag Rank #2707 of 2996
37.2% (UK avg 26.6%) drag on savings
£258 fixed • ~£693 /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
27.66p/kWh
Daily Fixed Charge
70.76p/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, Q3 2026

Installation costs: DESNZ/MCS data, March 2026 (TIC)

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