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Solar panel cost in Gwynedd (LL41)

See realistic solar installation costs, savings and payback for LL41 (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
13.3 years
After this, it's pure profit
Upfront Cost
£7,307
What you pay to get started
Annual Benefit
£551
What you save every year
Profit Over 25 Years
£6,477
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 808 kWh/kW — 122 below the regional median (930).

Read the full story

A typical roof here lands around 4.0 kW, with most eligible homes comfortably fitting within 3–6 kW. Each kilowatt of panels produces roughly 808 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)
808 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: £689, Upfront: £9,134, Break-even: 13.3 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1616 kWh 646 kWh 969 kWh £179 £97 £276 £3,654 13.3 yrs £1,860
3 kW 2423 kWh 969 kWh 1454 kWh £268 £145 £414 £5,481 13.3 yrs £2,790
4 kW 3231 kWh 1293 kWh 1939 kWh £358 £194 £551 £7,307 13.3 yrs £3,720
5 kW 4039 kWh 1616 kWh 2423 kWh £447 £242 £689 £9,134 13.3 yrs £4,650
6 kW 4847 kWh 1939 kWh 2908 kWh £536 £291 £827 £10,961 13.3 yrs £5,581
7 kW 5655 kWh 2262 kWh 3393 kWh £626 £339 £965 £12,788 13.3 yrs £6,511
8 kW 6463 kWh 2585 kWh 3878 kWh £715 £388 £1,103 £14,615 13.3 yrs £7,441

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,827, battery £/kWh = 700.

3 kWh battery 5 kW example → Annual benefit: £832, Upfront: £11,234, Break-even: 13.5 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1616 kWh 969 kWh 646 kWh £268 £65 £333 £5,754 17.3 yrs £901
3 kW 2423 kWh 1454 kWh 969 kWh £402 £97 £499 £7,581 15.2 yrs £2,402
4 kW 3231 kWh 1939 kWh 1293 kWh £536 £129 £666 £9,407 14.1 yrs £3,903
5 kW 4039 kWh 2423 kWh 1616 kWh £670 £162 £832 £11,234 13.5 yrs £5,404
6 kW 4847 kWh 2908 kWh 1939 kWh £804 £194 £998 £13,061 13.1 yrs £6,904
7 kW 5655 kWh 3393 kWh 2262 kWh £938 £226 £1,165 £14,888 12.8 yrs £8,405
8 kW 6463 kWh 3878 kWh 2585 kWh £1,073 £259 £1,331 £16,715 12.6 yrs £9,906

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,827, battery £/kWh = 700.

5 kWh battery 5 kW example → Annual benefit: £903, Upfront: £12,634, Break-even: 14.0 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1616 kWh 1131 kWh 485 kWh £313 £48 £361 £7,154 19.8 yrs £72
3 kW 2423 kWh 1696 kWh 727 kWh £469 £73 £542 £8,981 16.6 yrs £1,858
4 kW 3231 kWh 2262 kWh 969 kWh £626 £97 £723 £10,807 15.0 yrs £3,644
5 kW 4039 kWh 2827 kWh 1212 kWh £782 £121 £903 £12,634 14.0 yrs £5,430
6 kW 4847 kWh 3393 kWh 1454 kWh £938 £145 £1,084 £14,461 13.3 yrs £7,216
7 kW 5655 kWh 3958 kWh 1696 kWh £1,095 £170 £1,265 £16,288 12.9 yrs £9,002
8 kW 6463 kWh 4524 kWh 1939 kWh £1,251 £194 £1,445 £18,115 12.5 yrs £10,788

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,827, battery £/kWh = 700.

7.5 kWh battery 5 kW example → Annual benefit: £925, Upfront: £14,384, Break-even: 15.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1616 kWh 1179 kWh 436 kWh £326 £44 £370 £8,904 24.1 yrs £-1,507
3 kW 2423 kWh 1769 kWh 654 kWh £489 £65 £555 £10,731 19.3 yrs £365
4 kW 3231 kWh 2359 kWh 872 kWh £652 £87 £740 £12,557 17.0 yrs £2,237
5 kW 4039 kWh 2949 kWh 1091 kWh £816 £109 £925 £14,384 15.6 yrs £4,108
6 kW 4847 kWh 3538 kWh 1309 kWh £979 £131 £1,110 £16,211 14.6 yrs £5,980
7 kW 5655 kWh 4128 kWh 1527 kWh £1,142 £153 £1,294 £18,038 13.9 yrs £7,852
8 kW 6463 kWh 4718 kWh 1745 kWh £1,305 £174 £1,479 £19,865 13.4 yrs £9,723

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,827, battery £/kWh = 700.

10 kWh battery 5 kW example → Annual benefit: £939, Upfront: £16,134, Break-even: 17.2 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1616 kWh 1212 kWh 404 kWh £335 £40 £376 £10,654 28.4 yrs £-3,143
3 kW 2423 kWh 1818 kWh 606 kWh £503 £61 £563 £12,481 22.2 yrs £-1,214
4 kW 3231 kWh 2423 kWh 808 kWh £670 £81 £751 £14,307 19.0 yrs £715
5 kW 4039 kWh 3029 kWh 1010 kWh £838 £101 £939 £16,134 17.2 yrs £2,644
6 kW 4847 kWh 3635 kWh 1212 kWh £1,005 £121 £1,127 £17,961 15.9 yrs £4,572
7 kW 5655 kWh 4241 kWh 1414 kWh £1,173 £141 £1,314 £19,788 15.1 yrs £6,501
8 kW 6463 kWh 4847 kWh 1616 kWh £1,341 £162 £1,502 £21,615 14.4 yrs £8,430

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,827, battery £/kWh = 700.

13.5 kWh battery 5 kW example → Annual benefit: £953, Upfront: £18,584, Break-even: 19.5 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1616 kWh 1244 kWh 372 kWh £344 £37 £381 £13,104 34.4 yrs £-5,478
3 kW 2423 kWh 1866 kWh 557 kWh £516 £56 £572 £14,931 26.1 yrs £-3,493
4 kW 3231 kWh 2488 kWh 743 kWh £688 £74 £763 £16,757 22.0 yrs £-1,507
5 kW 4039 kWh 3110 kWh 929 kWh £860 £93 £953 £18,584 19.5 yrs £479
6 kW 4847 kWh 3732 kWh 1115 kWh £1,032 £111 £1,144 £20,411 17.8 yrs £2,465
7 kW 5655 kWh 4354 kWh 1301 kWh £1,204 £130 £1,334 £22,238 16.7 yrs £4,450
8 kW 6463 kWh 4976 kWh 1486 kWh £1,376 £149 £1,525 £24,065 15.8 yrs £6,436

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,827, 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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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.

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Insights for LL41

Figures below are tailored to LL41 — click through for full league tables.

Big-Roof Britain Rank #1431 of 2182
4.7 kWp (UK avg 5.1 kWp)
~10 panels (≈430 W)
Solar Payback Index Rank #2828 of 2996
13.2 years (UK avg 10.8 years)
~£552 /yr • £7,307 upfront
Standing-Charge Drag Rank #2987 of 2996
46.7% (UK avg 26.6%) drag on savings
£258 fixed • ~£552 /yr value
Aspect Penalty View ranking →
East −17.2% West −20.1%
Typical output loss versus a south-facing roof (lower is better)

Seasonal solar output in LL41

Monthly generation per kilowatt of solar panels

kWh 23 Jan 38 Feb 72 Mar 100 Apr 108 May 105 Jun 102 Jul 88 Aug 74 Sep 48 Oct 29 Nov 20 Dec
Best month Worst month Winter (Dec–Feb) Other months

Winter output: 40.3% 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 27 kWh per month; the average month produces around 67 kWh. So a typical 4 kW home system would generate roughly 109 kWh in winter, or 269 kWh in an average month.

Your Area at a Glance

Your Electricity Rate
27.66p/kWh
Daily Fixed Charge
70.76p/day
Local Sunshine
808kWh/kW
A 1 kW system generates ~808 kWh per year. A typical home uses ~2,700 kWh per year.
Typical System Size
4.0kW
For houses & bungalows in this area

Local Property Data

Property Types

Houses: 86% • Flats: 6% • Bungalows: 6% Based on 1,796 properties

Coverage

Gwynedd (100%)

Areas Covered

Bowydd a'r Rhiw, Diffwys a Maenofferen, Trawsfynydd, Teigl, 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

LL25 (Conwy)
≈7.9 km away
Local sunshine: ~823 kWh/kWp · +2% vs LL41
LL48 (Gwynedd)
≈10.9 km away
Local sunshine: ~812 kWh/kWp · +1% vs LL41
LL24 (Conwy)
≈11.2 km away
Local sunshine: ~811 kWh/kWp · +0% vs LL41
LL47 (Gwynedd)
≈13.0 km away
Local sunshine: ~795 kWh/kWp · -2% vs LL41
LL49 (Gwynedd)
≈15.0 km away
Local sunshine: ~827 kWh/kWp · +2% vs LL41
LL46 (Gwynedd)
≈18.7 km away
Local sunshine: ~830 kWh/kWp · +3% vs LL41

Similar sunshine across the UK

IV15 (Highland)
~807 kWh/kWp · -0% vs LL41
PA16 (Inverclyde)
~808 kWh/kWp · +0% vs LL41
PA83 (Na h-Eileanan Siar)
~809 kWh/kWp · +0% vs LL41