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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in LL56 (Gwynedd)

See if solar pays off for you in Gwynedd — price, savings and payback in under a minute (official UK data).

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
13.6 years
After this, it's pure profit
Upfront Cost
£10,173
What you pay to get started
Annual Benefit
£746
What you save every year
Profit Over 25 Years
£8,472
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 27.72p/kWh with a 69.95p/day standing charge. Your postcode’s south-facing sunshine yield is 873 kWh/kW — 57 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 873 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
70.0p/day
Sunshine yield (south)
873 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: £746, Upfront: £10,173, Break-even: 13.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1746 kWh 698 kWh 1047 kWh £194 £105 £298 £4,069 13.6 yrs £1,897
3 kW 2619 kWh 1047 kWh 1571 kWh £290 £157 £447 £6,104 13.6 yrs £2,846
4 kW 3491 kWh 1397 kWh 2095 kWh £387 £209 £597 £8,138 13.6 yrs £3,794
5 kW 4364 kWh 1746 kWh 2619 kWh £484 £262 £746 £10,173 13.6 yrs £4,743
6 kW 5237 kWh 2095 kWh 3142 kWh £581 £314 £895 £12,207 13.6 yrs £5,691
7 kW 6110 kWh 2444 kWh 3666 kWh £677 £367 £1,044 £14,242 13.6 yrs £6,640
8 kW 6983 kWh 2793 kWh 4190 kWh £774 £419 £1,193 £16,276 13.6 yrs £7,589

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: £900, Upfront: £12,273, Break-even: 13.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1746 kWh 1047 kWh 698 kWh £290 £70 £360 £6,169 17.1 yrs £1,035
3 kW 2619 kWh 1571 kWh 1047 kWh £436 £105 £540 £8,204 15.2 yrs £2,602
4 kW 3491 kWh 2095 kWh 1397 kWh £581 £140 £720 £10,238 14.2 yrs £4,169
5 kW 4364 kWh 2619 kWh 1746 kWh £726 £175 £900 £12,273 13.6 yrs £5,736
6 kW 5237 kWh 3142 kWh 2095 kWh £871 £209 £1,081 £14,307 13.2 yrs £7,304
7 kW 6110 kWh 3666 kWh 2444 kWh £1,016 £244 £1,261 £16,342 13.0 yrs £8,871
8 kW 6983 kWh 4190 kWh 2793 kWh £1,161 £279 £1,441 £18,376 12.8 yrs £10,438

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: £978, Upfront: £13,673, 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 1746 kWh 1222 kWh 524 kWh £339 £52 £391 £7,569 19.4 yrs £253
3 kW 2619 kWh 1833 kWh 786 kWh £508 £79 £587 £9,604 16.4 yrs £2,130
4 kW 3491 kWh 2444 kWh 1047 kWh £677 £105 £782 £11,638 14.9 yrs £4,006
5 kW 4364 kWh 3055 kWh 1309 kWh £847 £131 £978 £13,673 14.0 yrs £5,883
6 kW 5237 kWh 3666 kWh 1571 kWh £1,016 £157 £1,173 £15,707 13.4 yrs £7,760
7 kW 6110 kWh 4277 kWh 1833 kWh £1,186 £183 £1,369 £17,742 13.0 yrs £9,636
8 kW 6983 kWh 4888 kWh 2095 kWh £1,355 £209 £1,564 £19,776 12.6 yrs £11,513

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: £1,001, Upfront: £15,423, Break-even: 15.4 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1746 kWh 1274 kWh 471 kWh £353 £47 £400 £9,319 23.3 yrs £-1,311
3 kW 2619 kWh 1912 kWh 707 kWh £530 £71 £601 £11,354 18.9 yrs £658
4 kW 3491 kWh 2549 kWh 943 kWh £707 £94 £801 £13,388 16.7 yrs £2,628
5 kW 4364 kWh 3186 kWh 1178 kWh £883 £118 £1,001 £15,423 15.4 yrs £4,597
6 kW 5237 kWh 3823 kWh 1414 kWh £1,060 £141 £1,201 £17,457 14.5 yrs £6,566
7 kW 6110 kWh 4460 kWh 1650 kWh £1,236 £165 £1,401 £19,492 13.9 yrs £8,536
8 kW 6983 kWh 5098 kWh 1885 kWh £1,413 £189 £1,602 £21,526 13.4 yrs £10,505

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: £1,016, Upfront: £17,173, Break-even: 16.9 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1746 kWh 1309 kWh 436 kWh £363 £44 £407 £11,069 27.2 yrs £-2,937
3 kW 2619 kWh 1964 kWh 655 kWh £544 £65 £610 £13,104 21.5 yrs £-906
4 kW 3491 kWh 2619 kWh 873 kWh £726 £87 £813 £15,138 18.6 yrs £1,125
5 kW 4364 kWh 3273 kWh 1091 kWh £907 £109 £1,016 £17,173 16.9 yrs £3,156
6 kW 5237 kWh 3928 kWh 1309 kWh £1,089 £131 £1,220 £19,207 15.7 yrs £5,188
7 kW 6110 kWh 4583 kWh 1528 kWh £1,270 £153 £1,423 £21,242 14.9 yrs £7,219
8 kW 6983 kWh 5237 kWh 1746 kWh £1,452 £175 £1,626 £23,276 14.3 yrs £9,250

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: £1,032, Upfront: £19,623, Break-even: 19.0 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1746 kWh 1344 kWh 402 kWh £373 £40 £413 £13,519 32.8 yrs £-5,264
3 kW 2619 kWh 2016 kWh 602 kWh £559 £60 £619 £15,554 25.1 yrs £-3,171
4 kW 3491 kWh 2688 kWh 803 kWh £745 £80 £826 £17,588 21.3 yrs £-1,077
5 kW 4364 kWh 3361 kWh 1004 kWh £932 £100 £1,032 £19,623 19.0 yrs £1,016
6 kW 5237 kWh 4033 kWh 1205 kWh £1,118 £120 £1,238 £21,657 17.5 yrs £3,109
7 kW 6110 kWh 4705 kWh 1405 kWh £1,304 £141 £1,445 £23,692 16.4 yrs £5,202
8 kW 6983 kWh 5377 kWh 1606 kWh £1,490 £161 £1,651 £25,726 15.6 yrs £7,295

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 LL56

Figures below are tailored to LL56 — click through for full league tables.

Big-Roof Britain Rank #1004 of 2182
5.1 kWp (UK avg 5.1 kWp)
~11 panels (≈430 W)
Solar Payback Index Rank #2121 of 2997
11.8 years (UK avg 11.3 years)
~£862 /yr • £10,173 upfront
Standing-Charge Drag Rank #2626 of 2997
29.6% (UK avg 21.7%) drag on savings
£255 fixed • ~£862 /yr value

Your Area at a Glance

Your Electricity Rate
27.72p/kWh
Daily Fixed Charge
69.95p/day
Local Sunshine
873kWh/kW
A 1 kW system generates ~873 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: 74% • Flats: 20% • Bungalows: 4% Based on 697 properties

Coverage

Gwynedd (100%)

Areas Covered

Bethel a'r Felinheli, Canol Bangor, Y Faenol, Penisa'r-waun

Data Sources & Assumptions

Solar yield: PVGIS (EU Joint Research Centre), January 2025 data

Electricity rates: Ofgem price cap, Q4 2025

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

LL61 (Isle of Anglesey)
≈2.1 km away
Local sunshine: ~884 kWh/kWp · +1% vs LL56
LL55 (Gwynedd)
≈5.6 km away
Local sunshine: ~859 kWh/kWp · -2% vs LL56
LL59 (Isle of Anglesey)
≈5.8 km away
Local sunshine: ~843 kWh/kWp · -3% vs LL56
LL60 (Isle of Anglesey)
≈5.9 km away
Local sunshine: ~907 kWh/kWp · +4% vs LL56
LL57 (Gwynedd)
≈6.6 km away
Local sunshine: ~792 kWh/kWp · -9% vs LL56
LL77 (Isle of Anglesey)
≈10.3 km away
Local sunshine: ~966 kWh/kWp · +11% vs LL56

Similar sunshine across the UK

AB4 (Aberdeenshire)
~873 kWh/kWp · -0% vs LL56
AB41 (Aberdeenshire)
~873 kWh/kWp · +0% vs LL56
BT80 (Mid Ulster)
~873 kWh/kWp · -0% vs LL56