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Solar panel cost in Gwynedd (LL49)

See realistic solar installation costs, savings and payback for LL49 (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
13.9 years
After this, it's pure profit
Upfront Cost
£10,173
What you pay to get started
Annual Benefit
£729
What you save every year
Profit Over 25 Years
£8,061
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 29.09p/kWh with a 71.01p/day standing charge. Your postcode’s south-facing sunshine yield is 827 kWh/kW — 103 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 827 kWh per year on a south-facing roof. We value self-used electricity at 29.1p and exported surplus at a baseline 10p via SEG. Use the calculator above for your exact tariff.

Unit rate
29.1p/kWh
Standing charge
71.0p/day
Sunshine yield (south)
827 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: £729, Upfront: £10,173, Break-even: 13.9 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1654 kWh 662 kWh 993 kWh £192 £99 £292 £4,069 13.9 yrs £1,766
3 kW 2481 kWh 993 kWh 1489 kWh £289 £149 £438 £6,104 13.9 yrs £2,649
4 kW 3308 kWh 1323 kWh 1985 kWh £385 £199 £583 £8,138 13.9 yrs £3,531
5 kW 4136 kWh 1654 kWh 2481 kWh £481 £248 £729 £10,173 13.9 yrs £4,414
6 kW 4963 kWh 1985 kWh 2978 kWh £577 £298 £875 £12,207 13.9 yrs £5,297
7 kW 5790 kWh 2316 kWh 3474 kWh £674 £347 £1,021 £14,242 13.9 yrs £6,180
8 kW 6617 kWh 2647 kWh 3970 kWh £770 £397 £1,167 £16,276 13.9 yrs £7,063

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: £887, Upfront: £12,273, Break-even: 13.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1654 kWh 993 kWh 662 kWh £289 £66 £355 £6,169 17.4 yrs £929
3 kW 2481 kWh 1489 kWh 993 kWh £433 £99 £532 £8,204 15.4 yrs £2,443
4 kW 3308 kWh 1985 kWh 1323 kWh £577 £132 £710 £10,238 14.4 yrs £3,958
5 kW 4136 kWh 2481 kWh 1654 kWh £722 £165 £887 £12,273 13.8 yrs £5,472
6 kW 4963 kWh 2978 kWh 1985 kWh £866 £199 £1,065 £14,307 13.4 yrs £6,986
7 kW 5790 kWh 3474 kWh 2316 kWh £1,011 £232 £1,242 £16,342 13.2 yrs £8,501
8 kW 6617 kWh 3970 kWh 2647 kWh £1,155 £265 £1,420 £18,376 12.9 yrs £10,015

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: £966, Upfront: £13,673, Break-even: 14.2 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1654 kWh 1158 kWh 496 kWh £337 £50 £386 £7,569 19.6 yrs £160
3 kW 2481 kWh 1737 kWh 744 kWh £505 £74 £580 £9,604 16.6 yrs £1,991
4 kW 3308 kWh 2316 kWh 993 kWh £674 £99 £773 £11,638 15.1 yrs £3,821
5 kW 4136 kWh 2895 kWh 1241 kWh £842 £124 £966 £13,673 14.2 yrs £5,651
6 kW 4963 kWh 3474 kWh 1489 kWh £1,011 £149 £1,159 £15,707 13.5 yrs £7,481
7 kW 5790 kWh 4053 kWh 1737 kWh £1,179 £174 £1,353 £17,742 13.1 yrs £9,311
8 kW 6617 kWh 4632 kWh 1985 kWh £1,347 £199 £1,546 £19,776 12.8 yrs £11,142

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: £990, Upfront: £15,423, 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 1654 kWh 1208 kWh 447 kWh £351 £45 £396 £9,319 23.5 yrs £-1,400
3 kW 2481 kWh 1811 kWh 670 kWh £527 £67 £594 £11,354 19.1 yrs £525
4 kW 3308 kWh 2415 kWh 893 kWh £703 £89 £792 £13,388 16.9 yrs £2,450
5 kW 4136 kWh 3019 kWh 1117 kWh £878 £112 £990 £15,423 15.6 yrs £4,375
6 kW 4963 kWh 3623 kWh 1340 kWh £1,054 £134 £1,188 £17,457 14.7 yrs £6,300
7 kW 5790 kWh 4226 kWh 1563 kWh £1,229 £156 £1,386 £19,492 14.1 yrs £8,225
8 kW 6617 kWh 4830 kWh 1787 kWh £1,405 £179 £1,584 £21,526 13.6 yrs £10,149

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: £1,006, Upfront: £17,173, Break-even: 17.1 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1654 kWh 1241 kWh 414 kWh £361 £41 £402 £11,069 27.5 yrs £-3,024
3 kW 2481 kWh 1861 kWh 620 kWh £541 £62 £603 £13,104 21.7 yrs £-1,036
4 kW 3308 kWh 2481 kWh 827 kWh £722 £83 £805 £15,138 18.8 yrs £952
5 kW 4136 kWh 3102 kWh 1034 kWh £902 £103 £1,006 £17,173 17.1 yrs £2,940
6 kW 4963 kWh 3722 kWh 1241 kWh £1,083 £124 £1,207 £19,207 15.9 yrs £4,929
7 kW 5790 kWh 4342 kWh 1447 kWh £1,263 £145 £1,408 £21,242 15.1 yrs £6,917
8 kW 6617 kWh 4963 kWh 1654 kWh £1,444 £165 £1,609 £23,276 14.5 yrs £8,905

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: £1,021, Upfront: £19,623, Break-even: 19.2 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1654 kWh 1274 kWh 380 kWh £371 £38 £409 £13,519 33.1 yrs £-5,348
3 kW 2481 kWh 1911 kWh 571 kWh £556 £57 £613 £15,554 25.4 yrs £-3,296
4 kW 3308 kWh 2547 kWh 761 kWh £741 £76 £817 £17,588 21.5 yrs £-1,245
5 kW 4136 kWh 3184 kWh 951 kWh £926 £95 £1,021 £19,623 19.2 yrs £806
6 kW 4963 kWh 3821 kWh 1141 kWh £1,112 £114 £1,226 £21,657 17.7 yrs £2,857
7 kW 5790 kWh 4458 kWh 1332 kWh £1,297 £133 £1,430 £23,692 16.6 yrs £4,909
8 kW 6617 kWh 5095 kWh 1522 kWh £1,482 £152 £1,634 £25,726 15.7 yrs £6,960

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 LL49

Figures below are tailored to LL49 — click through for full league tables.

Big-Roof Britain Rank #859 of 2182
5.2 kWp (UK avg 5.1 kWp)
~11 panels (≈430 W)
Solar Payback Index Rank #2643 of 2997
13.9 years (UK avg 12.6 years)
~£729 /yr • £10,173 upfront
Standing-Charge Drag Rank #2687 of 2997
35.6% (UK avg 24.6%) drag on savings
£259 fixed • ~£729 /yr value
Aspect Penalty View ranking →
East −19.2% West −17.8%
Typical output loss versus a south-facing roof (lower is better)

Your Area at a Glance

Your Electricity Rate
29.09p/kWh
Daily Fixed Charge
71.01p/day
Local Sunshine
827kWh/kW
A 1 kW system generates ~827 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: 66% • Flats: 18% • Bungalows: 11% Based on 1,220 properties

Coverage

Gwynedd (100%)

Areas Covered

Gorllewin Porthmadog, Dwyrain Porthmadog, Glaslyn, Dolbenmaen

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

LL48 (Gwynedd)
≈4.5 km away
Local sunshine: ~812 kWh/kWp · -2% vs LL49
LL47 (Gwynedd)
≈5.7 km away
Local sunshine: ~795 kWh/kWp · -4% vs LL49
LL52 (Gwynedd)
≈6.8 km away
Local sunshine: ~934 kWh/kWp · +13% vs LL49
LL46 (Gwynedd)
≈8.0 km away
Local sunshine: ~830 kWh/kWp · +0% vs LL49
LL51 (Gwynedd)
≈8.6 km away
Local sunshine: ~896 kWh/kWp · +8% vs LL49
LL45 (Gwynedd)
≈12.3 km away
Local sunshine: ~835 kWh/kWp · +1% vs LL49

Similar sunshine across the UK

G3 (Glasgow City)
~827 kWh/kWp · +0% vs LL49
PH44 (Highland)
~827 kWh/kWp · +0% vs LL49
PA69 (Argyll and Bute)
~827 kWh/kWp · -0% vs LL49