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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in LL57 (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
15.0 years
After this, it's pure profit
Upfront Cost
£10,173
What you pay to get started
Annual Benefit
£676
What you save every year
Profit Over 25 Years
£6,736
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 792 kWh/kW — 138 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 792 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)
792 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: £676, Upfront: £10,173, 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 1583 kWh 633 kWh 950 kWh £176 £95 £271 £4,069 15.0 yrs £1,342
3 kW 2375 kWh 950 kWh 1425 kWh £263 £142 £406 £6,104 15.0 yrs £2,013
4 kW 3166 kWh 1267 kWh 1900 kWh £351 £190 £541 £8,138 15.0 yrs £2,684
5 kW 3958 kWh 1583 kWh 2375 kWh £439 £237 £676 £10,173 15.0 yrs £3,355
6 kW 4750 kWh 1900 kWh 2850 kWh £527 £285 £812 £12,207 15.0 yrs £4,026
7 kW 5541 kWh 2217 kWh 3325 kWh £614 £332 £947 £14,242 15.0 yrs £4,697
8 kW 6333 kWh 2533 kWh 3800 kWh £702 £380 £1,082 £16,276 15.0 yrs £5,367

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: £817, Upfront: £12,273, 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 1583 kWh 950 kWh 633 kWh £263 £63 £327 £6,169 18.9 yrs £364
3 kW 2375 kWh 1425 kWh 950 kWh £395 £95 £490 £8,204 16.7 yrs £1,596
4 kW 3166 kWh 1900 kWh 1267 kWh £527 £127 £653 £10,238 15.7 yrs £2,828
5 kW 3958 kWh 2375 kWh 1583 kWh £658 £158 £817 £12,273 15.0 yrs £4,060
6 kW 4750 kWh 2850 kWh 1900 kWh £790 £190 £980 £14,307 14.6 yrs £5,292
7 kW 5541 kWh 3325 kWh 2217 kWh £922 £222 £1,143 £16,342 14.3 yrs £6,524
8 kW 6333 kWh 3800 kWh 2533 kWh £1,053 £253 £1,307 £18,376 14.1 yrs £7,756

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: £887, Upfront: £13,673, 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 1583 kWh 1108 kWh 475 kWh £307 £47 £355 £7,569 21.3 yrs £-475
3 kW 2375 kWh 1662 kWh 712 kWh £461 £71 £532 £9,604 18.0 yrs £1,038
4 kW 3166 kWh 2217 kWh 950 kWh £614 £95 £709 £11,638 16.4 yrs £2,550
5 kW 3958 kWh 2771 kWh 1187 kWh £768 £119 £887 £13,673 15.4 yrs £4,063
6 kW 4750 kWh 3325 kWh 1425 kWh £922 £142 £1,064 £15,707 14.8 yrs £5,575
7 kW 5541 kWh 3879 kWh 1662 kWh £1,075 £166 £1,241 £17,742 14.3 yrs £7,088
8 kW 6333 kWh 4433 kWh 1900 kWh £1,229 £190 £1,419 £19,776 13.9 yrs £8,601

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: £908, Upfront: £15,423, Break-even: 17.0 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1583 kWh 1156 kWh 427 kWh £320 £43 £363 £9,319 25.7 yrs £-2,057
3 kW 2375 kWh 1734 kWh 641 kWh £481 £64 £545 £11,354 20.8 yrs £-460
4 kW 3166 kWh 2312 kWh 855 kWh £641 £85 £726 £13,388 18.4 yrs £1,137
5 kW 3958 kWh 2889 kWh 1069 kWh £801 £107 £908 £15,423 17.0 yrs £2,734
6 kW 4750 kWh 3467 kWh 1282 kWh £961 £128 £1,089 £17,457 16.0 yrs £4,330
7 kW 5541 kWh 4045 kWh 1496 kWh £1,121 £150 £1,271 £19,492 15.3 yrs £5,927
8 kW 6333 kWh 4623 kWh 1710 kWh £1,282 £171 £1,453 £21,526 14.8 yrs £7,524

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: £922, Upfront: £17,173, Break-even: 18.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1583 kWh 1187 kWh 396 kWh £329 £40 £369 £11,069 30.0 yrs £-3,694
3 kW 2375 kWh 1781 kWh 594 kWh £494 £59 £553 £13,104 23.7 yrs £-2,041
4 kW 3166 kWh 2375 kWh 792 kWh £658 £79 £737 £15,138 20.5 yrs £-389
5 kW 3958 kWh 2969 kWh 990 kWh £823 £99 £922 £17,173 18.6 yrs £1,264
6 kW 4750 kWh 3562 kWh 1187 kWh £987 £119 £1,106 £19,207 17.4 yrs £2,917
7 kW 5541 kWh 4156 kWh 1385 kWh £1,152 £139 £1,291 £21,242 16.5 yrs £4,570
8 kW 6333 kWh 4750 kWh 1583 kWh £1,317 £158 £1,475 £23,276 15.8 yrs £6,223

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: £936, Upfront: £19,623, Break-even: 21.0 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1583 kWh 1219 kWh 364 kWh £338 £36 £374 £13,519 36.1 yrs £-6,032
3 kW 2375 kWh 1829 kWh 546 kWh £507 £55 £562 £15,554 27.7 yrs £-4,323
4 kW 3166 kWh 2438 kWh 728 kWh £676 £73 £749 £17,588 23.5 yrs £-2,614
5 kW 3958 kWh 3048 kWh 910 kWh £845 £91 £936 £19,623 21.0 yrs £-905
6 kW 4750 kWh 3657 kWh 1092 kWh £1,014 £109 £1,123 £21,657 19.3 yrs £804
7 kW 5541 kWh 4267 kWh 1275 kWh £1,183 £127 £1,310 £23,692 18.1 yrs £2,513
8 kW 6333 kWh 4876 kWh 1457 kWh £1,352 £146 £1,497 £25,726 17.2 yrs £4,222

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 LL57

Figures below are tailored to LL57 — click through for full league tables.

Big-Roof Britain Rank #1393 of 2182
4.8 kWp (UK avg 5.1 kWp)
~10 panels (≈430 W)
Solar Payback Index Rank #2817 of 2997
13.0 years (UK avg 11.3 years)
~£782 /yr • £10,173 upfront
Standing-Charge Drag Rank #2756 of 2997
32.6% (UK avg 21.7%) drag on savings
£255 fixed • ~£782 /yr value

Your Area at a Glance

Your Electricity Rate
27.72p/kWh
Daily Fixed Charge
69.95p/day
Local Sunshine
792kWh/kW
A 1 kW system generates ~792 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: 68% • Flats: 23% • Bungalows: 8% Based on 7,061 properties

Coverage

Gwynedd (100%)

Areas Covered

Canol Bangor, Dwyrain Bangor, Tre-garth a Mynydd Llandygái, Y Faenol, Arllechwedd, Gerlan, Rachub, Canol Bethesda + 4 more

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

LL59 (Isle of Anglesey)
≈2.7 km away
Local sunshine: ~843 kWh/kWp · +7% vs LL57
LL56 (Gwynedd)
≈6.6 km away
Local sunshine: ~873 kWh/kWp · +10% vs LL57
LL58 (Isle of Anglesey)
≈6.9 km away
Local sunshine: ~819 kWh/kWp · +3% vs LL57
LL61 (Isle of Anglesey)
≈7.8 km away
Local sunshine: ~884 kWh/kWp · +12% vs LL57
LL75 (Isle of Anglesey)
≈9.4 km away
Local sunshine: ~931 kWh/kWp · +18% vs LL57
LL60 (Isle of Anglesey)
≈9.8 km away
Local sunshine: ~907 kWh/kWp · +15% vs LL57

Similar sunshine across the UK

PA84 (Na h-Eileanan Siar)
~792 kWh/kWp · +0% vs LL57
HS4 (Na h-Eileanan Siar)
~791 kWh/kWp · -0% vs LL57
CA17 (Westmorland and Furness)
~792 kWh/kWp · +0% vs LL57