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Solar panel cost in Gwynedd (LL46)

See realistic solar installation costs, savings and payback for LL46 (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
11.5 years
After this, it's pure profit
Upfront Cost
£9,767
What you pay to get started
Annual Benefit
£850
What you save every year
Profit Over 25 Years
£11,477
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 830 kWh/kW — 100 below 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 830 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)
830 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: £708, Upfront: £8,139, Break-even: 11.5 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1660 kWh 664 kWh 996 kWh £184 £100 £283 £3,256 11.5 yrs £2,409
3 kW 2490 kWh 996 kWh 1494 kWh £275 £149 £425 £4,883 11.5 yrs £3,614
4 kW 3320 kWh 1328 kWh 1992 kWh £367 £199 £566 £6,511 11.5 yrs £4,819
5 kW 4150 kWh 1660 kWh 2490 kWh £459 £249 £708 £8,139 11.5 yrs £6,023
6 kW 4980 kWh 1992 kWh 2988 kWh £551 £299 £850 £9,767 11.5 yrs £7,228
7 kW 5810 kWh 2324 kWh 3486 kWh £643 £349 £991 £11,394 11.5 yrs £8,433
8 kW 6640 kWh 2656 kWh 3984 kWh £735 £398 £1,133 £13,022 11.5 yrs £9,637

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: £855, Upfront: £10,239, Break-even: 12.0 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1660 kWh 996 kWh 664 kWh £275 £66 £342 £5,356 15.7 yrs £1,482
3 kW 2490 kWh 1494 kWh 996 kWh £413 £100 £513 £6,983 13.6 yrs £3,273
4 kW 3320 kWh 1992 kWh 1328 kWh £551 £133 £684 £8,611 12.6 yrs £5,064
5 kW 4150 kWh 2490 kWh 1660 kWh £689 £166 £855 £10,239 12.0 yrs £6,855
6 kW 4980 kWh 2988 kWh 1992 kWh £826 £199 £1,026 £11,867 11.6 yrs £8,646
7 kW 5810 kWh 3486 kWh 2324 kWh £964 £232 £1,197 £13,494 11.3 yrs £10,437
8 kW 6640 kWh 3984 kWh 2656 kWh £1,102 £266 £1,367 £15,122 11.1 yrs £12,227

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: £928, Upfront: £11,639, Break-even: 12.5 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1660 kWh 1162 kWh 498 kWh £321 £50 £371 £6,756 18.2 yrs £668
3 kW 2490 kWh 1743 kWh 747 kWh £482 £75 £557 £8,383 15.1 yrs £2,752
4 kW 3320 kWh 2324 kWh 996 kWh £643 £100 £742 £10,011 13.5 yrs £4,836
5 kW 4150 kWh 2905 kWh 1245 kWh £803 £124 £928 £11,639 12.5 yrs £6,920
6 kW 4980 kWh 3486 kWh 1494 kWh £964 £149 £1,114 £13,267 11.9 yrs £9,004
7 kW 5810 kWh 4067 kWh 1743 kWh £1,125 £174 £1,299 £14,894 11.5 yrs £11,088
8 kW 6640 kWh 4648 kWh 1992 kWh £1,286 £199 £1,485 £16,522 11.1 yrs £13,173

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: £950, Upfront: £13,389, Break-even: 14.1 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1660 kWh 1212 kWh 448 kWh £335 £45 £380 £8,506 22.4 yrs £-906
3 kW 2490 kWh 1818 kWh 672 kWh £503 £67 £570 £10,133 17.8 yrs £1,266
4 kW 3320 kWh 2423 kWh 896 kWh £670 £90 £760 £11,761 15.5 yrs £3,438
5 kW 4150 kWh 3029 kWh 1120 kWh £838 £112 £950 £13,389 14.1 yrs £5,610
6 kW 4980 kWh 3635 kWh 1345 kWh £1,005 £134 £1,140 £15,017 13.2 yrs £7,782
7 kW 5810 kWh 4241 kWh 1569 kWh £1,173 £157 £1,330 £16,644 12.5 yrs £9,954
8 kW 6640 kWh 4847 kWh 1793 kWh £1,341 £179 £1,520 £18,272 12.0 yrs £12,126

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: £965, Upfront: £15,139, 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 1660 kWh 1245 kWh 415 kWh £344 £41 £386 £10,256 26.6 yrs £-2,539
3 kW 2490 kWh 1867 kWh 622 kWh £517 £62 £579 £11,883 20.5 yrs £-308
4 kW 3320 kWh 2490 kWh 830 kWh £689 £83 £772 £13,511 17.5 yrs £1,923
5 kW 4150 kWh 3112 kWh 1037 kWh £861 £104 £965 £15,139 15.7 yrs £4,153
6 kW 4980 kWh 3735 kWh 1245 kWh £1,033 £124 £1,158 £16,767 14.5 yrs £6,384
7 kW 5810 kWh 4357 kWh 1452 kWh £1,205 £145 £1,350 £18,394 13.6 yrs £8,614
8 kW 6640 kWh 4980 kWh 1660 kWh £1,377 £166 £1,543 £20,022 13.0 yrs £10,845

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: £979, Upfront: £17,589, Break-even: 18.0 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1660 kWh 1278 kWh 382 kWh £354 £38 £392 £12,706 32.4 yrs £-4,871
3 kW 2490 kWh 1917 kWh 573 kWh £530 £57 £588 £14,333 24.4 yrs £-2,582
4 kW 3320 kWh 2556 kWh 764 kWh £707 £76 £783 £15,961 20.4 yrs £-293
5 kW 4150 kWh 3195 kWh 954 kWh £884 £95 £979 £17,589 18.0 yrs £1,996
6 kW 4980 kWh 3834 kWh 1145 kWh £1,061 £115 £1,175 £19,217 16.4 yrs £4,286
7 kW 5810 kWh 4473 kWh 1336 kWh £1,237 £134 £1,371 £20,844 15.2 yrs £6,575
8 kW 6640 kWh 5112 kWh 1527 kWh £1,414 £153 £1,567 £22,472 14.3 yrs £8,864

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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Check what MCS certification means

Understand DNO, G98 and G99 export limits

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Insights for LL46

Figures below are tailored to LL46 — click through for full league tables.

Big-Roof Britain Rank #270 of 2182
6.0 kWp (UK avg 5.1 kWp)
~13 panels (≈430 W)
Solar Payback Index Rank #2300 of 2996
11.5 years (UK avg 10.8 years)
~£850 /yr • £9,767 upfront
Standing-Charge Drag Rank #2175 of 2996
30.4% (UK avg 26.6%) drag on savings
£258 fixed • ~£850 /yr value
Aspect Penalty View ranking →
East −17.5% West −20.6%
Typical output loss versus a south-facing roof (lower is better)

Seasonal solar output in LL46

Monthly generation per kilowatt of solar panels

kWh 25 Jan 41 Feb 74 Mar 103 Apr 112 May 109 Jun 103 Jul 89 Aug 74 Sep 49 Oct 30 Nov 20 Dec
Best month Worst month Winter (Dec–Feb) Other months

Winter output: 41.6% 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 29 kWh per month; the average month produces around 69 kWh. So a typical 4 kW home system would generate roughly 115 kWh in winter, or 277 kWh in an average month.

Your Area at a Glance

Your Electricity Rate
27.66p/kWh
Daily Fixed Charge
70.76p/day
Local Sunshine
830kWh/kW
A 1 kW system generates ~830 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: 53% • Flats: 11% • Bungalows: 31% Based on 658 properties

Coverage

Gwynedd (100%)

Areas Covered

Harlech a Llanbedr, Gorllewin Porthmadog

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

LL45 (Gwynedd)
≈4.3 km away
Local sunshine: ~835 kWh/kWp · +1% vs LL46
LL47 (Gwynedd)
≈5.7 km away
Local sunshine: ~795 kWh/kWp · -4% vs LL46
LL44 (Gwynedd)
≈7.7 km away
Local sunshine: ~875 kWh/kWp · +5% vs LL46
LL49 (Gwynedd)
≈8.0 km away
Local sunshine: ~827 kWh/kWp · -0% vs LL46
LL48 (Gwynedd)
≈8.7 km away
Local sunshine: ~812 kWh/kWp · -2% vs LL46
LL43 (Gwynedd)
≈9.3 km away
Local sunshine: ~875 kWh/kWp · +5% vs LL46

Similar sunshine across the UK

PH8 (Perth and Kinross)
~830 kWh/kWp · -0% vs LL46
AB33 (Aberdeenshire)
~830 kWh/kWp · -0% vs LL46
AB36 (Aberdeenshire)
~830 kWh/kWp · +0% vs LL46