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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in LL36 (Gwynedd)

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

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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
12.7 years
After this, it's pure profit
Upfront Cost
£12,207
What you pay to get started
Annual Benefit
£964
What you save every year
Profit Over 25 Years
£11,899
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 940 kWh/kW — 11 above 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 940 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)
940 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: £804, Upfront: £10,173, Break-even: 12.7 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1881 kWh 752 kWh 1129 kWh £209 £113 £321 £4,069 12.7 yrs £2,359
3 kW 2821 kWh 1129 kWh 1693 kWh £313 £169 £482 £6,104 12.7 yrs £3,539
4 kW 3762 kWh 1505 kWh 2257 kWh £417 £226 £643 £8,138 12.7 yrs £4,718
5 kW 4702 kWh 1881 kWh 2821 kWh £521 £282 £804 £10,173 12.7 yrs £5,898
6 kW 5643 kWh 2257 kWh 3386 kWh £626 £339 £964 £12,207 12.7 yrs £7,078
7 kW 6583 kWh 2633 kWh 3950 kWh £730 £395 £1,125 £14,242 12.7 yrs £8,257
8 kW 7524 kWh 3009 kWh 4514 kWh £834 £451 £1,286 £16,276 12.7 yrs £9,437

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: £970, Upfront: £12,273, Break-even: 12.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1881 kWh 1129 kWh 752 kWh £313 £75 £388 £6,169 15.9 yrs £1,592
3 kW 2821 kWh 1693 kWh 1129 kWh £469 £113 £582 £8,204 14.1 yrs £3,439
4 kW 3762 kWh 2257 kWh 1505 kWh £626 £150 £776 £10,238 13.2 yrs £5,285
5 kW 4702 kWh 2821 kWh 1881 kWh £782 £188 £970 £12,273 12.6 yrs £7,131
6 kW 5643 kWh 3386 kWh 2257 kWh £939 £226 £1,164 £14,307 12.3 yrs £8,977
7 kW 6583 kWh 3950 kWh 2633 kWh £1,095 £263 £1,358 £16,342 12.0 yrs £10,823
8 kW 7524 kWh 4514 kWh 3009 kWh £1,251 £301 £1,552 £18,376 11.8 yrs £12,670

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: £1,054, Upfront: £13,673, Break-even: 13.0 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1881 kWh 1317 kWh 564 kWh £365 £56 £421 £7,569 18.0 yrs £859
3 kW 2821 kWh 1975 kWh 846 kWh £547 £85 £632 £9,604 15.2 yrs £3,039
4 kW 3762 kWh 2633 kWh 1129 kWh £730 £113 £843 £11,638 13.8 yrs £5,218
5 kW 4702 kWh 3292 kWh 1411 kWh £912 £141 £1,054 £13,673 13.0 yrs £7,398
6 kW 5643 kWh 3950 kWh 1693 kWh £1,095 £169 £1,264 £15,707 12.4 yrs £9,577
7 kW 6583 kWh 4608 kWh 1975 kWh £1,277 £197 £1,475 £17,742 12.0 yrs £11,757
8 kW 7524 kWh 5267 kWh 2257 kWh £1,460 £226 £1,686 £19,776 11.7 yrs £13,936

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: £1,079, Upfront: £15,423, 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 1881 kWh 1373 kWh 508 kWh £381 £51 £431 £9,319 21.6 yrs £-691
3 kW 2821 kWh 2060 kWh 762 kWh £571 £76 £647 £11,354 17.5 yrs £1,588
4 kW 3762 kWh 2746 kWh 1016 kWh £761 £102 £863 £13,388 15.5 yrs £3,868
5 kW 4702 kWh 3433 kWh 1270 kWh £952 £127 £1,079 £15,423 14.3 yrs £6,147
6 kW 5643 kWh 4119 kWh 1524 kWh £1,142 £152 £1,294 £17,457 13.5 yrs £8,427
7 kW 6583 kWh 4806 kWh 1777 kWh £1,332 £178 £1,510 £19,492 12.9 yrs £10,706
8 kW 7524 kWh 5492 kWh 2031 kWh £1,522 £203 £1,726 £21,526 12.5 yrs £12,986

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: £1,095, Upfront: £17,173, Break-even: 15.7 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1881 kWh 1411 kWh 470 kWh £391 £47 £438 £11,069 25.3 yrs £-2,308
3 kW 2821 kWh 2116 kWh 705 kWh £587 £71 £657 £13,104 19.9 yrs £38
4 kW 3762 kWh 2821 kWh 940 kWh £782 £94 £876 £15,138 17.3 yrs £2,385
5 kW 4702 kWh 3527 kWh 1176 kWh £978 £118 £1,095 £17,173 15.7 yrs £4,731
6 kW 5643 kWh 4232 kWh 1411 kWh £1,173 £141 £1,314 £19,207 14.6 yrs £7,077
7 kW 6583 kWh 4937 kWh 1646 kWh £1,369 £165 £1,533 £21,242 13.9 yrs £9,423
8 kW 7524 kWh 5643 kWh 1881 kWh £1,564 £188 £1,752 £23,276 13.3 yrs £11,769

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: £1,112, Upfront: £19,623, Break-even: 17.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1881 kWh 1448 kWh 433 kWh £401 £43 £445 £13,519 30.4 yrs £-4,624
3 kW 2821 kWh 2172 kWh 649 kWh £602 £65 £667 £15,554 23.3 yrs £-2,212
4 kW 3762 kWh 2897 kWh 865 kWh £803 £87 £889 £17,588 19.8 yrs £201
5 kW 4702 kWh 3621 kWh 1082 kWh £1,004 £108 £1,112 £19,623 17.6 yrs £2,614
6 kW 5643 kWh 4345 kWh 1298 kWh £1,204 £130 £1,334 £21,657 16.2 yrs £5,027
7 kW 6583 kWh 5069 kWh 1514 kWh £1,405 £151 £1,557 £23,692 15.2 yrs £7,440
8 kW 7524 kWh 5793 kWh 1730 kWh £1,606 £173 £1,779 £25,726 14.5 yrs £9,852

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 LL36

Figures below are tailored to LL36 — click through for full league tables.

Big-Roof Britain Rank #359 of 2182
5.8 kWp (UK avg 5.1 kWp)
~12 panels (≈430 W)
Solar Payback Index Rank #1231 of 2997
11.0 years (UK avg 11.3 years)
~£1,114 /yr • £12,207 upfront
Standing-Charge Drag Rank #2058 of 2997
22.9% (UK avg 21.7%) drag on savings
£255 fixed • ~£1,114 /yr value

Your Area at a Glance

Your Electricity Rate
27.72p/kWh
Daily Fixed Charge
69.95p/day
Local Sunshine
940kWh/kW
A 1 kW system generates ~940 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: 49% • Flats: 16% • Bungalows: 32% Based on 1,591 properties

Coverage

Gwynedd (100%)

Areas Covered

Bro Dysynni, Morfa Tywyn, Gorllewin Tywyn, Arthog a Llangelynnin, Aberdyfi

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

LL35 (Gwynedd)
≈5.4 km away
Local sunshine: ~877 kWh/kWp · -7% vs LL36
LL37 (Gwynedd)
≈8.7 km away
Local sunshine: ~878 kWh/kWp · -7% vs LL36
LL38 (Gwynedd)
≈12.2 km away
Local sunshine: ~846 kWh/kWp · -10% vs LL36
SY24 (Ceredigion)
≈12.9 km away
Local sunshine: ~880 kWh/kWp · -6% vs LL36
LL39 (Gwynedd)
≈14.4 km away
Local sunshine: ~825 kWh/kWp · -12% vs LL36
LL42 (Gwynedd)
≈15.2 km away
Local sunshine: ~864 kWh/kWp · -8% vs LL36

Similar sunshine across the UK

NE70 (Northumberland)
~941 kWh/kWp · +0% vs LL36
NE37 (Sunderland)
~940 kWh/kWp · -0% vs LL36
SR4 (Sunderland)
~941 kWh/kWp · +0% vs LL36