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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in LL51 (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
13.3 years
After this, it's pure profit
Upfront Cost
£12,207
What you pay to get started
Annual Benefit
£919
What you save every year
Profit Over 25 Years
£10,756
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 896 kWh/kW — 34 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 896 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)
896 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: £765, Upfront: £10,173, 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 1792 kWh 717 kWh 1075 kWh £199 £108 £306 £4,069 13.3 yrs £2,054
3 kW 2688 kWh 1075 kWh 1613 kWh £298 £161 £459 £6,104 13.3 yrs £3,082
4 kW 3583 kWh 1433 kWh 2150 kWh £397 £215 £612 £8,138 13.3 yrs £4,109
5 kW 4479 kWh 1792 kWh 2688 kWh £497 £269 £765 £10,173 13.3 yrs £5,136
6 kW 5375 kWh 2150 kWh 3225 kWh £596 £323 £919 £12,207 13.3 yrs £6,163
7 kW 6271 kWh 2508 kWh 3763 kWh £695 £376 £1,072 £14,242 13.3 yrs £7,191
8 kW 7167 kWh 2867 kWh 4300 kWh £795 £430 £1,225 £16,276 13.3 yrs £8,218

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: £924, Upfront: £12,273, 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 1792 kWh 1075 kWh 717 kWh £298 £72 £370 £6,169 16.7 yrs £1,224
3 kW 2688 kWh 1613 kWh 1075 kWh £447 £108 £555 £8,204 14.8 yrs £2,887
4 kW 3583 kWh 2150 kWh 1433 kWh £596 £143 £739 £10,238 13.8 yrs £4,549
5 kW 4479 kWh 2688 kWh 1792 kWh £745 £179 £924 £12,273 13.3 yrs £6,211
6 kW 5375 kWh 3225 kWh 2150 kWh £894 £215 £1,109 £14,307 12.9 yrs £7,873
7 kW 6271 kWh 3763 kWh 2508 kWh £1,043 £251 £1,294 £16,342 12.6 yrs £9,535
8 kW 7167 kWh 4300 kWh 2867 kWh £1,192 £287 £1,479 £18,376 12.4 yrs £11,198

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: £1,004, Upfront: £13,673, 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 1792 kWh 1254 kWh 538 kWh £348 £54 £401 £7,569 18.9 yrs £459
3 kW 2688 kWh 1881 kWh 806 kWh £522 £81 £602 £9,604 15.9 yrs £2,439
4 kW 3583 kWh 2508 kWh 1075 kWh £695 £108 £803 £11,638 14.5 yrs £4,419
5 kW 4479 kWh 3136 kWh 1344 kWh £869 £134 £1,004 £13,673 13.6 yrs £6,399
6 kW 5375 kWh 3763 kWh 1613 kWh £1,043 £161 £1,204 £15,707 13.0 yrs £8,378
7 kW 6271 kWh 4390 kWh 1881 kWh £1,217 £188 £1,405 £17,742 12.6 yrs £10,358
8 kW 7167 kWh 5017 kWh 2150 kWh £1,391 £215 £1,606 £19,776 12.3 yrs £12,338

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: £1,027, Upfront: £15,423, Break-even: 15.0 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1792 kWh 1308 kWh 484 kWh £363 £48 £411 £9,319 22.7 yrs £-1,100
3 kW 2688 kWh 1962 kWh 726 kWh £544 £73 £616 £11,354 18.4 yrs £975
4 kW 3583 kWh 2616 kWh 968 kWh £725 £97 £822 £13,388 16.3 yrs £3,050
5 kW 4479 kWh 3270 kWh 1209 kWh £906 £121 £1,027 £15,423 15.0 yrs £5,125
6 kW 5375 kWh 3924 kWh 1451 kWh £1,088 £145 £1,233 £17,457 14.2 yrs £7,200
7 kW 6271 kWh 4578 kWh 1693 kWh £1,269 £169 £1,438 £19,492 13.6 yrs £9,275
8 kW 7167 kWh 5232 kWh 1935 kWh £1,450 £194 £1,644 £21,526 13.1 yrs £11,350

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: £1,043, Upfront: £17,173, Break-even: 16.5 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1792 kWh 1344 kWh 448 kWh £373 £45 £417 £11,069 26.5 yrs £-2,723
3 kW 2688 kWh 2016 kWh 672 kWh £559 £67 £626 £13,104 20.9 yrs £-585
4 kW 3583 kWh 2688 kWh 896 kWh £745 £90 £835 £15,138 18.1 yrs £1,554
5 kW 4479 kWh 3360 kWh 1120 kWh £931 £112 £1,043 £17,173 16.5 yrs £3,692
6 kW 5375 kWh 4031 kWh 1344 kWh £1,118 £134 £1,252 £19,207 15.3 yrs £5,831
7 kW 6271 kWh 4703 kWh 1568 kWh £1,304 £157 £1,461 £21,242 14.5 yrs £7,969
8 kW 7167 kWh 5375 kWh 1792 kWh £1,490 £179 £1,669 £23,276 13.9 yrs £10,108

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: £1,059, Upfront: £19,623, Break-even: 18.5 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1792 kWh 1380 kWh 412 kWh £382 £41 £424 £13,519 31.9 yrs £-5,046
3 kW 2688 kWh 2069 kWh 618 kWh £574 £62 £635 £15,554 24.5 yrs £-2,844
4 kW 3583 kWh 2759 kWh 824 kWh £765 £82 £847 £17,588 20.8 yrs £-642
5 kW 4479 kWh 3449 kWh 1030 kWh £956 £103 £1,059 £19,623 18.5 yrs £1,560
6 kW 5375 kWh 4139 kWh 1236 kWh £1,147 £124 £1,271 £21,657 17.0 yrs £3,762
7 kW 6271 kWh 4829 kWh 1442 kWh £1,339 £144 £1,483 £23,692 16.0 yrs £5,964
8 kW 7167 kWh 5519 kWh 1648 kWh £1,530 £165 £1,695 £25,726 15.2 yrs £8,166

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 LL51

Figures below are tailored to LL51 — click through for full league tables.

Big-Roof Britain Rank #234 of 2182
6.1 kWp (UK avg 5.1 kWp)
~13 panels (≈430 W)
Solar Payback Index Rank #1787 of 2997
11.5 years (UK avg 11.3 years)
~£1,061 /yr • £12,207 upfront
Standing-Charge Drag Rank #2136 of 2997
24.1% (UK avg 21.7%) drag on savings
£255 fixed • ~£1,061 /yr value

Your Area at a Glance

Your Electricity Rate
27.72p/kWh
Daily Fixed Charge
69.95p/day
Local Sunshine
896kWh/kW
A 1 kW system generates ~896 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: 82% • Flats: 0% • Bungalows: 18% Based on 210 properties

Coverage

Gwynedd (100%)

Areas Covered

Dolbenmaen, Clynnog, Llanystumdwy, Glaslyn, Gorllewin Porthmadog

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

LL52 (Gwynedd)
≈5.7 km away
Local sunshine: ~934 kWh/kWp · +4% vs LL51
LL49 (Gwynedd)
≈8.6 km away
Local sunshine: ~827 kWh/kWp · -8% vs LL51
LL54 (Gwynedd)
≈10.1 km away
Local sunshine: ~938 kWh/kWp · +5% vs LL51
LL48 (Gwynedd)
≈12.3 km away
Local sunshine: ~812 kWh/kWp · -9% vs LL51
LL47 (Gwynedd)
≈14.3 km away
Local sunshine: ~795 kWh/kWp · -11% vs LL51
LL46 (Gwynedd)
≈15.4 km away
Local sunshine: ~830 kWh/kWp · -7% vs LL51

Similar sunshine across the UK

AB31 (Aberdeenshire)
~896 kWh/kWp · -0% vs LL51
KY4 (Fife)
~896 kWh/kWp · -0% vs LL51
S33 (High Peak)
~896 kWh/kWp · -0% vs LL51