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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in LL41 (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
£8,138
What you pay to get started
Annual Benefit
£552
What you save every year
Profit Over 25 Years
£5,666
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 808 kWh/kW — 122 below the regional median (930).

Read the full story

A typical roof here lands around 4.0 kW, with most eligible homes comfortably fitting within 3–6 kW. Each kilowatt of panels produces roughly 808 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)
808 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: £690, 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 1616 kWh 646 kWh 969 kWh £179 £97 £276 £4,069 14.7 yrs £1,453
3 kW 2423 kWh 969 kWh 1454 kWh £269 £145 £414 £6,104 14.7 yrs £2,179
4 kW 3231 kWh 1293 kWh 1939 kWh £358 £194 £552 £8,138 14.7 yrs £2,905
5 kW 4039 kWh 1616 kWh 2423 kWh £448 £242 £690 £10,173 14.7 yrs £3,631
6 kW 4847 kWh 1939 kWh 2908 kWh £537 £291 £828 £12,207 14.7 yrs £4,358
7 kW 5655 kWh 2262 kWh 3393 kWh £627 £339 £966 £14,242 14.7 yrs £5,084
8 kW 6463 kWh 2585 kWh 3878 kWh £717 £388 £1,104 £16,276 14.7 yrs £5,810

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: £833, Upfront: £12,273, 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 1616 kWh 969 kWh 646 kWh £269 £65 £333 £6,169 18.5 yrs £498
3 kW 2423 kWh 1454 kWh 969 kWh £403 £97 £500 £8,204 16.4 yrs £1,797
4 kW 3231 kWh 1939 kWh 1293 kWh £537 £129 £667 £10,238 15.4 yrs £3,096
5 kW 4039 kWh 2423 kWh 1616 kWh £672 £162 £833 £12,273 14.7 yrs £4,394
6 kW 4847 kWh 2908 kWh 1939 kWh £806 £194 £1,000 £14,307 14.3 yrs £5,693
7 kW 5655 kWh 3393 kWh 2262 kWh £940 £226 £1,167 £16,342 14.0 yrs £6,992
8 kW 6463 kWh 3878 kWh 2585 kWh £1,075 £259 £1,333 £18,376 13.8 yrs £8,291

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: £905, Upfront: £13,673, Break-even: 15.1 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1616 kWh 1131 kWh 485 kWh £313 £48 £362 £7,569 20.9 yrs £-330
3 kW 2423 kWh 1696 kWh 727 kWh £470 £73 £543 £9,604 17.7 yrs £1,256
4 kW 3231 kWh 2262 kWh 969 kWh £627 £97 £724 £11,638 16.1 yrs £2,841
5 kW 4039 kWh 2827 kWh 1212 kWh £784 £121 £905 £13,673 15.1 yrs £4,426
6 kW 4847 kWh 3393 kWh 1454 kWh £940 £145 £1,086 £15,707 14.5 yrs £6,011
7 kW 5655 kWh 3958 kWh 1696 kWh £1,097 £170 £1,267 £17,742 14.0 yrs £7,596
8 kW 6463 kWh 4524 kWh 1939 kWh £1,254 £194 £1,448 £19,776 13.7 yrs £9,181

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: £926, 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 1616 kWh 1179 kWh 436 kWh £327 £44 £371 £9,319 25.1 yrs £-1,908
3 kW 2423 kWh 1769 kWh 654 kWh £490 £65 £556 £11,354 20.4 yrs £-237
4 kW 3231 kWh 2359 kWh 872 kWh £654 £87 £741 £13,388 18.1 yrs £1,434
5 kW 4039 kWh 2949 kWh 1091 kWh £817 £109 £926 £15,423 16.6 yrs £3,105
6 kW 4847 kWh 3538 kWh 1309 kWh £981 £131 £1,112 £17,457 15.7 yrs £4,776
7 kW 5655 kWh 4128 kWh 1527 kWh £1,144 £153 £1,297 £19,492 15.0 yrs £6,447
8 kW 6463 kWh 4718 kWh 1745 kWh £1,308 £174 £1,482 £21,526 14.5 yrs £8,118

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: £941, Upfront: £17,173, Break-even: 18.3 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1616 kWh 1212 kWh 404 kWh £336 £40 £376 £11,069 29.4 yrs £-3,543
3 kW 2423 kWh 1818 kWh 606 kWh £504 £61 £564 £13,104 23.2 yrs £-1,815
4 kW 3231 kWh 2423 kWh 808 kWh £672 £81 £753 £15,138 20.1 yrs £-87
5 kW 4039 kWh 3029 kWh 1010 kWh £840 £101 £941 £17,173 18.3 yrs £1,642
6 kW 4847 kWh 3635 kWh 1212 kWh £1,008 £121 £1,129 £19,207 17.0 yrs £3,370
7 kW 5655 kWh 4241 kWh 1414 kWh £1,176 £141 £1,317 £21,242 16.1 yrs £5,098
8 kW 6463 kWh 4847 kWh 1616 kWh £1,344 £162 £1,505 £23,276 15.5 yrs £6,827

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: £955, Upfront: £19,623, Break-even: 20.5 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1616 kWh 1244 kWh 372 kWh £345 £37 £382 £13,519 35.4 yrs £-5,879
3 kW 2423 kWh 1866 kWh 557 kWh £517 £56 £573 £15,554 27.1 yrs £-4,093
4 kW 3231 kWh 2488 kWh 743 kWh £690 £74 £764 £17,588 23.0 yrs £-2,308
5 kW 4039 kWh 3110 kWh 929 kWh £862 £93 £955 £19,623 20.5 yrs £-522
6 kW 4847 kWh 3732 kWh 1115 kWh £1,035 £111 £1,146 £21,657 18.9 yrs £1,263
7 kW 5655 kWh 4354 kWh 1301 kWh £1,207 £130 £1,337 £23,692 17.7 yrs £3,049
8 kW 6463 kWh 4976 kWh 1486 kWh £1,379 £149 £1,528 £25,726 16.8 yrs £4,835

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 LL41

Figures below are tailored to LL41 — click through for full league tables.

Big-Roof Britain Rank #1431 of 2182
4.7 kWp (UK avg 5.1 kWp)
~10 panels (≈430 W)
Solar Payback Index Rank #2742 of 2997
12.8 years (UK avg 11.3 years)
~£638 /yr • £8,138 upfront
Standing-Charge Drag Rank #2968 of 2997
40.0% (UK avg 21.7%) drag on savings
£255 fixed • ~£638 /yr value

Your Area at a Glance

Your Electricity Rate
27.72p/kWh
Daily Fixed Charge
69.95p/day
Local Sunshine
808kWh/kW
A 1 kW system generates ~808 kWh per year. A typical home uses ~2,700 kWh per year.
Typical System Size
4.0kW
For houses & bungalows in this area

Local Property Data

Property Types

Houses: 86% • Flats: 6% • Bungalows: 6% Based on 1,796 properties

Coverage

Gwynedd (100%)

Areas Covered

Bowydd a'r Rhiw, Diffwys a Maenofferen, Trawsfynydd, Teigl, 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

LL25 (Conwy)
≈7.9 km away
Local sunshine: ~823 kWh/kWp · +2% vs LL41
LL48 (Gwynedd)
≈10.9 km away
Local sunshine: ~812 kWh/kWp · +1% vs LL41
LL24 (Conwy)
≈11.2 km away
Local sunshine: ~811 kWh/kWp · +0% vs LL41
LL47 (Gwynedd)
≈13.0 km away
Local sunshine: ~795 kWh/kWp · -2% vs LL41
LL49 (Gwynedd)
≈15.0 km away
Local sunshine: ~827 kWh/kWp · +2% vs LL41
LL46 (Gwynedd)
≈18.7 km away
Local sunshine: ~830 kWh/kWp · +3% vs LL41

Similar sunshine across the UK

IV15 (Highland)
~807 kWh/kWp · -0% vs LL41
PA16 (Inverclyde)
~808 kWh/kWp · +0% vs LL41
PA83 (Na h-Eileanan Siar)
~809 kWh/kWp · +0% vs LL41