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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in LL46 (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
14.3 years
After this, it's pure profit
Upfront Cost
£12,207
What you pay to get started
Annual Benefit
£851
What you save every year
Profit Over 25 Years
£9,066
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 830 kWh/kW — 100 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 830 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)
830 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: £709, Upfront: £10,173, Break-even: 14.3 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1660 kWh 664 kWh 996 kWh £184 £100 £284 £4,069 14.3 yrs £1,604
3 kW 2490 kWh 996 kWh 1494 kWh £276 £149 £425 £6,104 14.3 yrs £2,406
4 kW 3320 kWh 1328 kWh 1992 kWh £368 £199 £567 £8,138 14.3 yrs £3,208
5 kW 4150 kWh 1660 kWh 2490 kWh £460 £249 £709 £10,173 14.3 yrs £4,009
6 kW 4980 kWh 1992 kWh 2988 kWh £552 £299 £851 £12,207 14.3 yrs £4,811
7 kW 5810 kWh 2324 kWh 3486 kWh £644 £349 £993 £14,242 14.3 yrs £5,613
8 kW 6640 kWh 2656 kWh 3984 kWh £736 £398 £1,135 £16,276 14.3 yrs £6,415

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: £856, Upfront: £12,273, Break-even: 14.3 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1660 kWh 996 kWh 664 kWh £276 £66 £342 £6,169 18.0 yrs £680
3 kW 2490 kWh 1494 kWh 996 kWh £414 £100 £514 £8,204 16.0 yrs £2,070
4 kW 3320 kWh 1992 kWh 1328 kWh £552 £133 £685 £10,238 14.9 yrs £3,461
5 kW 4150 kWh 2490 kWh 1660 kWh £690 £166 £856 £12,273 14.3 yrs £4,851
6 kW 4980 kWh 2988 kWh 1992 kWh £828 £199 £1,027 £14,307 13.9 yrs £6,241
7 kW 5810 kWh 3486 kWh 2324 kWh £966 £232 £1,199 £16,342 13.6 yrs £7,631
8 kW 6640 kWh 3984 kWh 2656 kWh £1,104 £266 £1,370 £18,376 13.4 yrs £9,021

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: £930, Upfront: £13,673, 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 1660 kWh 1162 kWh 498 kWh £322 £50 £372 £7,569 20.4 yrs £-131
3 kW 2490 kWh 1743 kWh 747 kWh £483 £75 £558 £9,604 17.2 yrs £1,553
4 kW 3320 kWh 2324 kWh 996 kWh £644 £100 £744 £11,638 15.6 yrs £3,237
5 kW 4150 kWh 2905 kWh 1245 kWh £805 £124 £930 £13,673 14.7 yrs £4,921
6 kW 4980 kWh 3486 kWh 1494 kWh £966 £149 £1,116 £15,707 14.1 yrs £6,606
7 kW 5810 kWh 4067 kWh 1743 kWh £1,127 £174 £1,302 £17,742 13.6 yrs £8,290
8 kW 6640 kWh 4648 kWh 1992 kWh £1,288 £199 £1,488 £19,776 13.3 yrs £9,974

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: £952, Upfront: £15,423, Break-even: 16.2 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1660 kWh 1212 kWh 448 kWh £336 £45 £381 £9,319 24.5 yrs £-1,705
3 kW 2490 kWh 1818 kWh 672 kWh £504 £67 £571 £11,354 19.9 yrs £68
4 kW 3320 kWh 2423 kWh 896 kWh £672 £90 £761 £13,388 17.6 yrs £1,840
5 kW 4150 kWh 3029 kWh 1120 kWh £840 £112 £952 £15,423 16.2 yrs £3,613
6 kW 4980 kWh 3635 kWh 1345 kWh £1,008 £134 £1,142 £17,457 15.3 yrs £5,385
7 kW 5810 kWh 4241 kWh 1569 kWh £1,176 £157 £1,332 £19,492 14.6 yrs £7,158
8 kW 6640 kWh 4847 kWh 1793 kWh £1,344 £179 £1,523 £21,526 14.1 yrs £8,930

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: £966, Upfront: £17,173, Break-even: 17.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1660 kWh 1245 kWh 415 kWh £345 £41 £387 £11,069 28.6 yrs £-3,337
3 kW 2490 kWh 1867 kWh 622 kWh £518 £62 £580 £13,104 22.6 yrs £-1,506
4 kW 3320 kWh 2490 kWh 830 kWh £690 £83 £773 £15,138 19.6 yrs £325
5 kW 4150 kWh 3112 kWh 1037 kWh £863 £104 £966 £17,173 17.8 yrs £2,157
6 kW 4980 kWh 3735 kWh 1245 kWh £1,035 £124 £1,160 £19,207 16.6 yrs £3,988
7 kW 5810 kWh 4357 kWh 1452 kWh £1,208 £145 £1,353 £21,242 15.7 yrs £5,819
8 kW 6640 kWh 4980 kWh 1660 kWh £1,380 £166 £1,546 £23,276 15.1 yrs £7,651

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: £981, Upfront: £19,623, Break-even: 20.0 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1660 kWh 1278 kWh 382 kWh £354 £38 £392 £13,519 34.4 yrs £-5,670
3 kW 2490 kWh 1917 kWh 573 kWh £531 £57 £589 £15,554 26.4 yrs £-3,779
4 kW 3320 kWh 2556 kWh 764 kWh £709 £76 £785 £17,588 22.4 yrs £-1,889
5 kW 4150 kWh 3195 kWh 954 kWh £886 £95 £981 £19,623 20.0 yrs £1
6 kW 4980 kWh 3834 kWh 1145 kWh £1,063 £115 £1,177 £21,657 18.4 yrs £1,891
7 kW 5810 kWh 4473 kWh 1336 kWh £1,240 £134 £1,374 £23,692 17.2 yrs £3,781
8 kW 6640 kWh 5112 kWh 1527 kWh £1,417 £153 £1,570 £25,726 16.4 yrs £5,671

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 LL46

Figures below are tailored to LL46 — click through for full league tables.

Big-Roof Britain Rank #270 of 2182
6.0 kWp (UK avg 5.1 kWp)
~13 panels (≈430 W)
Solar Payback Index Rank #2614 of 2997
12.4 years (UK avg 11.3 years)
~£983 /yr • £12,207 upfront
Standing-Charge Drag Rank #2380 of 2997
26.0% (UK avg 21.7%) drag on savings
£255 fixed • ~£983 /yr value

Your Area at a Glance

Your Electricity Rate
27.72p/kWh
Daily Fixed Charge
69.95p/day
Local Sunshine
830kWh/kW
A 1 kW system generates ~830 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: 53% • Flats: 11% • Bungalows: 31% Based on 658 properties

Coverage

Gwynedd (100%)

Areas Covered

Harlech a Llanbedr, 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

LL45 (Gwynedd)
≈4.3 km away
Local sunshine: ~835 kWh/kWp · +1% vs LL46
LL47 (Gwynedd)
≈5.7 km away
Local sunshine: ~795 kWh/kWp · -4% vs LL46
LL44 (Gwynedd)
≈7.7 km away
Local sunshine: ~875 kWh/kWp · +5% vs LL46
LL49 (Gwynedd)
≈8.0 km away
Local sunshine: ~827 kWh/kWp · -0% vs LL46
LL48 (Gwynedd)
≈8.7 km away
Local sunshine: ~812 kWh/kWp · -2% vs LL46
LL43 (Gwynedd)
≈9.3 km away
Local sunshine: ~875 kWh/kWp · +5% vs LL46

Similar sunshine across the UK

PH8 (Perth and Kinross)
~830 kWh/kWp · -0% vs LL46
AB33 (Aberdeenshire)
~830 kWh/kWp · -0% vs LL46
AB36 (Aberdeenshire)
~830 kWh/kWp · +0% vs LL46