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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in LL48 (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
14.7 years
After this, it's pure profit
Upfront Cost
£10,173
What you pay to get started
Annual Benefit
£694
What you save every year
Profit Over 25 Years
£7,175
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 812 kWh/kW — 118 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 812 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)
812 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: £694, Upfront: £10,173, Break-even: 14.7 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1624 kWh 650 kWh 975 kWh £180 £97 £278 £4,069 14.7 yrs £1,482
3 kW 2437 kWh 975 kWh 1462 kWh £270 £146 £416 £6,104 14.7 yrs £2,223
4 kW 3249 kWh 1299 kWh 1949 kWh £360 £195 £555 £8,138 14.7 yrs £2,965
5 kW 4061 kWh 1624 kWh 2437 kWh £450 £244 £694 £10,173 14.7 yrs £3,706
6 kW 4873 kWh 1949 kWh 2924 kWh £540 £292 £833 £12,207 14.7 yrs £4,447
7 kW 5685 kWh 2274 kWh 3411 kWh £630 £341 £971 £14,242 14.7 yrs £5,188
8 kW 6497 kWh 2599 kWh 3898 kWh £720 £390 £1,110 £16,276 14.7 yrs £5,929

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: £838, Upfront: £12,273, Break-even: 14.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1624 kWh 975 kWh 650 kWh £270 £65 £335 £6,169 18.4 yrs £534
3 kW 2437 kWh 1462 kWh 975 kWh £405 £97 £503 £8,204 16.3 yrs £1,850
4 kW 3249 kWh 1949 kWh 1299 kWh £540 £130 £670 £10,238 15.3 yrs £3,167
5 kW 4061 kWh 2437 kWh 1624 kWh £675 £162 £838 £12,273 14.6 yrs £4,484
6 kW 4873 kWh 2924 kWh 1949 kWh £810 £195 £1,005 £14,307 14.2 yrs £5,801
7 kW 5685 kWh 3411 kWh 2274 kWh £946 £227 £1,173 £16,342 13.9 yrs £7,118
8 kW 6497 kWh 3898 kWh 2599 kWh £1,081 £260 £1,341 £18,376 13.7 yrs £8,435

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: £910, Upfront: £13,673, 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 1624 kWh 1137 kWh 487 kWh £315 £49 £364 £7,569 20.8 yrs £-291
3 kW 2437 kWh 1706 kWh 731 kWh £473 £73 £546 £9,604 17.6 yrs £1,314
4 kW 3249 kWh 2274 kWh 975 kWh £630 £97 £728 £11,638 16.0 yrs £2,919
5 kW 4061 kWh 2843 kWh 1218 kWh £788 £122 £910 £13,673 15.0 yrs £4,523
6 kW 4873 kWh 3411 kWh 1462 kWh £946 £146 £1,092 £15,707 14.4 yrs £6,128
7 kW 5685 kWh 3980 kWh 1706 kWh £1,103 £171 £1,274 £17,742 13.9 yrs £7,733
8 kW 6497 kWh 4548 kWh 1949 kWh £1,261 £195 £1,456 £19,776 13.6 yrs £9,337

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: £931, Upfront: £15,423, Break-even: 16.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1624 kWh 1186 kWh 439 kWh £329 £44 £373 £9,319 25.0 yrs £-1,868
3 kW 2437 kWh 1779 kWh 658 kWh £493 £66 £559 £11,354 20.3 yrs £-177
4 kW 3249 kWh 2372 kWh 877 kWh £657 £88 £745 £13,388 18.0 yrs £1,514
5 kW 4061 kWh 2964 kWh 1096 kWh £822 £110 £931 £15,423 16.6 yrs £3,205
6 kW 4873 kWh 3557 kWh 1316 kWh £986 £132 £1,118 £17,457 15.6 yrs £4,896
7 kW 5685 kWh 4150 kWh 1535 kWh £1,150 £154 £1,304 £19,492 14.9 yrs £6,587
8 kW 6497 kWh 4743 kWh 1754 kWh £1,315 £175 £1,490 £21,526 14.4 yrs £8,278

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: £946, Upfront: £17,173, Break-even: 18.2 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1624 kWh 1218 kWh 406 kWh £338 £41 £378 £11,069 29.3 yrs £-3,503
3 kW 2437 kWh 1827 kWh 609 kWh £507 £61 £567 £13,104 23.1 yrs £-1,754
4 kW 3249 kWh 2437 kWh 812 kWh £675 £81 £757 £15,138 20.0 yrs £-6
5 kW 4061 kWh 3046 kWh 1015 kWh £844 £102 £946 £17,173 18.2 yrs £1,743
6 kW 4873 kWh 3655 kWh 1218 kWh £1,013 £122 £1,135 £19,207 16.9 yrs £3,491
7 kW 5685 kWh 4264 kWh 1421 kWh £1,182 £142 £1,324 £21,242 16.0 yrs £5,240
8 kW 6497 kWh 4873 kWh 1624 kWh £1,351 £162 £1,513 £23,276 15.4 yrs £6,989

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: £960, Upfront: £19,623, Break-even: 20.4 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1624 kWh 1251 kWh 374 kWh £347 £37 £384 £13,519 35.2 yrs £-5,838
3 kW 2437 kWh 1876 kWh 560 kWh £520 £56 £576 £15,554 27.0 yrs £-4,032
4 kW 3249 kWh 2501 kWh 747 kWh £693 £75 £768 £17,588 22.9 yrs £-2,225
5 kW 4061 kWh 3127 kWh 934 kWh £867 £93 £960 £19,623 20.4 yrs £-419
6 kW 4873 kWh 3752 kWh 1121 kWh £1,040 £112 £1,152 £21,657 18.8 yrs £1,387
7 kW 5685 kWh 4378 kWh 1308 kWh £1,213 £131 £1,344 £23,692 17.6 yrs £3,193
8 kW 6497 kWh 5003 kWh 1494 kWh £1,387 £149 £1,536 £25,726 16.7 yrs £4,999

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 LL48

Figures below are tailored to LL48 — click through for full league tables.

Big-Roof Britain Rank #1003 of 2182
5.1 kWp (UK avg 5.1 kWp)
~11 panels (≈430 W)
Solar Payback Index Rank #2709 of 2997
12.7 years (UK avg 11.3 years)
~£802 /yr • £10,173 upfront
Standing-Charge Drag Rank #2701 of 2997
31.8% (UK avg 21.7%) drag on savings
£255 fixed • ~£802 /yr value

Your Area at a Glance

Your Electricity Rate
27.72p/kWh
Daily Fixed Charge
69.95p/day
Local Sunshine
812kWh/kW
A 1 kW system generates ~812 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: 80% • Flats: 5% • Bungalows: 14% Based on 684 properties

Coverage

Gwynedd (100%)

Areas Covered

Penrhyndeudraeth, Glaslyn, Gorllewin Porthmadog, Harlech a Llanbedr

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

LL47 (Gwynedd)
≈3.5 km away
Local sunshine: ~795 kWh/kWp · -2% vs LL48
LL49 (Gwynedd)
≈4.5 km away
Local sunshine: ~827 kWh/kWp · +2% vs LL48
LL46 (Gwynedd)
≈8.7 km away
Local sunshine: ~830 kWh/kWp · +2% vs LL48
LL41 (Gwynedd)
≈10.9 km away
Local sunshine: ~808 kWh/kWp · -1% vs LL48
LL52 (Gwynedd)
≈11.3 km away
Local sunshine: ~934 kWh/kWp · +15% vs LL48
LL51 (Gwynedd)
≈12.3 km away
Local sunshine: ~896 kWh/kWp · +10% vs LL48

Similar sunshine across the UK

CA13 (Cumberland)
~812 kWh/kWp · +0% vs LL48
HS5 (Na h-Eileanan Siar)
~812 kWh/kWp · -0% vs LL48
KA17 (East Ayrshire)
~813 kWh/kWp · +0% vs LL48