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Solar panel cost in Gwynedd (LL53)

See realistic solar installation costs, savings and payback for LL53 (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
9.7 years
After this, it's pure profit
Upfront Cost
£9,767
What you pay to get started
Annual Benefit
£1,012
What you save every year
Profit Over 25 Years
£15,534
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: 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 988 kWh/kW — 58 above the regional median (930).

Read the full story

A typical roof here lands around 6.0 kW, with most eligible homes comfortably fitting within 3–6 kW. Each kilowatt of panels produces roughly 988 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)
988 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: £843, Upfront: £8,139, Break-even: 9.7 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1977 kWh 791 kWh 1186 kWh £219 £119 £337 £3,256 9.7 yrs £3,491
3 kW 2965 kWh 1186 kWh 1779 kWh £328 £178 £506 £4,883 9.7 yrs £5,237
4 kW 3954 kWh 1582 kWh 2372 kWh £437 £237 £675 £6,511 9.7 yrs £6,982
5 kW 4942 kWh 1977 kWh 2965 kWh £547 £297 £843 £8,139 9.7 yrs £8,728
6 kW 5931 kWh 2372 kWh 3558 kWh £656 £356 £1,012 £9,767 9.7 yrs £10,474
7 kW 6919 kWh 2768 kWh 4151 kWh £766 £415 £1,181 £11,394 9.7 yrs £12,219
8 kW 7908 kWh 3163 kWh 4745 kWh £875 £474 £1,349 £13,022 9.7 yrs £13,965

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: £1,018, Upfront: £10,239, Break-even: 10.1 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1977 kWh 1186 kWh 791 kWh £328 £79 £407 £5,356 13.2 yrs £2,788
3 kW 2965 kWh 1779 kWh 1186 kWh £492 £119 £611 £6,983 11.4 yrs £5,231
4 kW 3954 kWh 2372 kWh 1582 kWh £656 £158 £814 £8,611 10.6 yrs £7,675
5 kW 4942 kWh 2965 kWh 1977 kWh £820 £198 £1,018 £10,239 10.1 yrs £10,119
6 kW 5931 kWh 3558 kWh 2372 kWh £984 £237 £1,221 £11,867 9.7 yrs £12,563
7 kW 6919 kWh 4151 kWh 2768 kWh £1,148 £277 £1,425 £13,494 9.5 yrs £15,007
8 kW 7908 kWh 4745 kWh 3163 kWh £1,312 £316 £1,629 £15,122 9.3 yrs £17,451

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: £1,105, Upfront: £11,639, Break-even: 10.5 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1977 kWh 1384 kWh 593 kWh £383 £59 £442 £6,756 15.3 yrs £2,086
3 kW 2965 kWh 2076 kWh 890 kWh £574 £89 £663 £8,383 12.6 yrs £4,879
4 kW 3954 kWh 2768 kWh 1186 kWh £766 £119 £884 £10,011 11.3 yrs £7,672
5 kW 4942 kWh 3460 kWh 1483 kWh £957 £148 £1,105 £11,639 10.5 yrs £10,465
6 kW 5931 kWh 4151 kWh 1779 kWh £1,148 £178 £1,326 £13,267 10.0 yrs £13,258
7 kW 6919 kWh 4843 kWh 2076 kWh £1,340 £208 £1,547 £14,894 9.6 yrs £16,051
8 kW 7908 kWh 5535 kWh 2372 kWh £1,531 £237 £1,768 £16,522 9.3 yrs £18,844

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: £1,131, Upfront: £13,389, Break-even: 11.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1977 kWh 1443 kWh 534 kWh £399 £53 £453 £8,506 18.8 yrs £545
3 kW 2965 kWh 2165 kWh 801 kWh £599 £80 £679 £10,133 14.9 yrs £3,443
4 kW 3954 kWh 2886 kWh 1068 kWh £798 £107 £905 £11,761 13.0 yrs £6,341
5 kW 4942 kWh 3608 kWh 1334 kWh £998 £133 £1,131 £13,389 11.8 yrs £9,238
6 kW 5931 kWh 4329 kWh 1601 kWh £1,198 £160 £1,358 £15,017 11.1 yrs £12,136
7 kW 6919 kWh 5051 kWh 1868 kWh £1,397 £187 £1,584 £16,644 10.5 yrs £15,034
8 kW 7908 kWh 5772 kWh 2135 kWh £1,597 £214 £1,810 £18,272 10.1 yrs £17,931

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: £1,149, Upfront: £15,139, Break-even: 13.2 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1977 kWh 1483 kWh 494 kWh £410 £49 £460 £10,256 22.3 yrs £-1,065
3 kW 2965 kWh 2224 kWh 741 kWh £615 £74 £689 £11,883 17.2 yrs £1,902
4 kW 3954 kWh 2965 kWh 988 kWh £820 £99 £919 £13,511 14.7 yrs £4,870
5 kW 4942 kWh 3707 kWh 1236 kWh £1,025 £124 £1,149 £15,139 13.2 yrs £7,837
6 kW 5931 kWh 4448 kWh 1483 kWh £1,230 £148 £1,379 £16,767 12.2 yrs £10,805
7 kW 6919 kWh 5189 kWh 1730 kWh £1,435 £173 £1,608 £18,394 11.4 yrs £13,772
8 kW 7908 kWh 5931 kWh 1977 kWh £1,640 £198 £1,838 £20,022 10.9 yrs £16,740

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: £1,166, Upfront: £17,589, 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 1977 kWh 1522 kWh 455 kWh £421 £45 £467 £12,706 27.2 yrs £-3,375
3 kW 2965 kWh 2283 kWh 682 kWh £632 £68 £700 £14,333 20.5 yrs £-338
4 kW 3954 kWh 3044 kWh 909 kWh £842 £91 £933 £15,961 17.1 yrs £2,699
5 kW 4942 kWh 3805 kWh 1137 kWh £1,053 £114 £1,166 £17,589 15.1 yrs £5,737
6 kW 5931 kWh 4567 kWh 1364 kWh £1,263 £136 £1,400 £19,217 13.7 yrs £8,774
7 kW 6919 kWh 5328 kWh 1591 kWh £1,474 £159 £1,633 £20,844 12.8 yrs £11,811
8 kW 7908 kWh 6089 kWh 1819 kWh £1,684 £182 £1,866 £22,472 12.0 yrs £14,849

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.

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Understand DNO, G98 and G99 export limits

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Insights for LL53

Figures below are tailored to LL53 — click through for full league tables.

Big-Roof Britain Rank #271 of 2182
6.0 kWp (UK avg 5.1 kWp)
~13 panels (≈430 W)
Solar Payback Index Rank #482 of 2996
9.7 years (UK avg 10.8 years)
~£1,012 /yr • £9,767 upfront
Standing-Charge Drag Rank #1513 of 2996
25.5% (UK avg 26.6%) drag on savings
£258 fixed • ~£1,012 /yr value
Aspect Penalty View ranking →
East −20.0% West −23.6%
Typical output loss versus a south-facing roof (lower is better)

Seasonal solar output in LL53

Monthly generation per kilowatt of solar panels

kWh 32 Jan 51 Feb 85 Mar 115 Apr 131 May 129 Jun 124 Jul 111 Aug 87 Sep 60 Oct 36 Nov 28 Dec
Best month Worst month Winter (Dec–Feb) Other months

Winter output: 45.0% 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 37 kWh per month; the average month produces around 82 kWh. So a typical 4 kW home system would generate roughly 148 kWh in winter, or 329 kWh in an average month.

Your Area at a Glance

Your Electricity Rate
27.66p/kWh
Daily Fixed Charge
70.76p/day
Local Sunshine
988kWh/kW
A 1 kW system generates ~988 kWh per year. A typical home uses ~2,700 kWh per year.
Typical System Size
6.0kW
For houses & bungalows in this area

Local Property Data

Property Types

Houses: 68% • Flats: 10% • Bungalows: 21% Based on 5,057 properties

Coverage

Gwynedd (100%)

Areas Covered

Gogledd Pwllheli, Pen draw Llŷn, Morfa Nefyn a Thudweiliog, Abersoch gyda Llanengan, De Pwllheli, Efailnewydd a Buan, Llanbedrog gyda Mynytho, Abererch + 3 more

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

LL52 (Gwynedd)
≈17.4 km away
Local sunshine: ~934 kWh/kWp · -6% vs LL53
LL51 (Gwynedd)
≈19.2 km away
Local sunshine: ~896 kWh/kWp · -9% vs LL53
LL54 (Gwynedd)
≈23.8 km away
Local sunshine: ~938 kWh/kWp · -5% vs LL53
LL49 (Gwynedd)
≈24.1 km away
Local sunshine: ~827 kWh/kWp · -16% vs LL53
LL46 (Gwynedd)
≈25.7 km away
Local sunshine: ~830 kWh/kWp · -16% vs LL53
LL45 (Gwynedd)
≈27.2 km away
Local sunshine: ~835 kWh/kWp · -16% vs LL53

Similar sunshine across the UK

N5 (Islington)
~988 kWh/kWp · +0% vs LL53
DN41 (North East Lincolnshire)
~988 kWh/kWp · +0% vs LL53
GL55 (Cotswold)
~988 kWh/kWp · +0% vs LL53