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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in LL37 (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
13.6 years
After this, it's pure profit
Upfront Cost
£12,207
What you pay to get started
Annual Benefit
£900
What you save every year
Profit Over 25 Years
£10,292
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 878 kWh/kW — 52 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 878 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)
878 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: £750, Upfront: £10,173, Break-even: 13.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1756 kWh 702 kWh 1053 kWh £195 £105 £300 £4,069 13.6 yrs £1,931
3 kW 2633 kWh 1053 kWh 1580 kWh £292 £158 £450 £6,104 13.6 yrs £2,896
4 kW 3511 kWh 1404 kWh 2107 kWh £389 £211 £600 £8,138 13.6 yrs £3,862
5 kW 4389 kWh 1756 kWh 2633 kWh £487 £263 £750 £10,173 13.6 yrs £4,827
6 kW 5267 kWh 2107 kWh 3160 kWh £584 £316 £900 £12,207 13.6 yrs £5,792
7 kW 6144 kWh 2458 kWh 3687 kWh £681 £369 £1,050 £14,242 13.6 yrs £6,758
8 kW 7022 kWh 2809 kWh 4213 kWh £779 £421 £1,200 £16,276 13.6 yrs £7,723

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: £906, Upfront: £12,273, Break-even: 13.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1756 kWh 1053 kWh 702 kWh £292 £70 £362 £6,169 17.0 yrs £1,075
3 kW 2633 kWh 1580 kWh 1053 kWh £438 £105 £543 £8,204 15.1 yrs £2,663
4 kW 3511 kWh 2107 kWh 1404 kWh £584 £140 £724 £10,238 14.1 yrs £4,250
5 kW 4389 kWh 2633 kWh 1756 kWh £730 £176 £906 £12,273 13.6 yrs £5,838
6 kW 5267 kWh 3160 kWh 2107 kWh £876 £211 £1,087 £14,307 13.2 yrs £7,425
7 kW 6144 kWh 3687 kWh 2458 kWh £1,022 £246 £1,268 £16,342 12.9 yrs £9,013
8 kW 7022 kWh 4213 kWh 2809 kWh £1,168 £281 £1,449 £18,376 12.7 yrs £10,600

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: £983, Upfront: £13,673, Break-even: 13.9 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1756 kWh 1229 kWh 527 kWh £341 £53 £393 £7,569 19.2 yrs £297
3 kW 2633 kWh 1843 kWh 790 kWh £511 £79 £590 £9,604 16.3 yrs £2,196
4 kW 3511 kWh 2458 kWh 1053 kWh £681 £105 £787 £11,638 14.8 yrs £4,095
5 kW 4389 kWh 3072 kWh 1317 kWh £852 £132 £983 £13,673 13.9 yrs £5,993
6 kW 5267 kWh 3687 kWh 1580 kWh £1,022 £158 £1,180 £15,707 13.3 yrs £7,892
7 kW 6144 kWh 4301 kWh 1843 kWh £1,192 £184 £1,377 £17,742 12.9 yrs £9,791
8 kW 7022 kWh 4916 kWh 2107 kWh £1,363 £211 £1,573 £19,776 12.6 yrs £11,689

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: £1,007, Upfront: £15,423, Break-even: 15.3 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1756 kWh 1282 kWh 474 kWh £355 £47 £403 £9,319 23.1 yrs £-1,266
3 kW 2633 kWh 1922 kWh 711 kWh £533 £71 £604 £11,354 18.8 yrs £726
4 kW 3511 kWh 2563 kWh 948 kWh £710 £95 £805 £13,388 16.6 yrs £2,718
5 kW 4389 kWh 3204 kWh 1185 kWh £888 £119 £1,007 £15,423 15.3 yrs £4,710
6 kW 5267 kWh 3845 kWh 1422 kWh £1,066 £142 £1,208 £17,457 14.5 yrs £6,702
7 kW 6144 kWh 4485 kWh 1659 kWh £1,243 £166 £1,409 £19,492 13.8 yrs £8,694
8 kW 7022 kWh 5126 kWh 1896 kWh £1,421 £190 £1,611 £21,526 13.4 yrs £10,686

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: £1,022, Upfront: £17,173, Break-even: 16.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1756 kWh 1317 kWh 439 kWh £365 £44 £409 £11,069 27.1 yrs £-2,892
3 kW 2633 kWh 1975 kWh 658 kWh £547 £66 £613 £13,104 21.4 yrs £-837
4 kW 3511 kWh 2633 kWh 878 kWh £730 £88 £818 £15,138 18.5 yrs £1,217
5 kW 4389 kWh 3292 kWh 1097 kWh £912 £110 £1,022 £17,173 16.8 yrs £3,271
6 kW 5267 kWh 3950 kWh 1317 kWh £1,095 £132 £1,227 £19,207 15.7 yrs £5,325
7 kW 6144 kWh 4608 kWh 1536 kWh £1,277 £154 £1,431 £21,242 14.8 yrs £7,379
8 kW 7022 kWh 5267 kWh 1756 kWh £1,460 £176 £1,635 £23,276 14.2 yrs £9,434

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: £1,038, Upfront: £19,623, Break-even: 18.9 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1756 kWh 1352 kWh 404 kWh £375 £40 £415 £13,519 32.6 yrs £-5,217
3 kW 2633 kWh 2028 kWh 606 kWh £562 £61 £623 £15,554 25.0 yrs £-3,101
4 kW 3511 kWh 2704 kWh 808 kWh £749 £81 £830 £17,588 21.2 yrs £-984
5 kW 4389 kWh 3379 kWh 1009 kWh £937 £101 £1,038 £19,623 18.9 yrs £1,132
6 kW 5267 kWh 4055 kWh 1211 kWh £1,124 £121 £1,245 £21,657 17.4 yrs £3,248
7 kW 6144 kWh 4731 kWh 1413 kWh £1,311 £141 £1,453 £23,692 16.3 yrs £5,365
8 kW 7022 kWh 5407 kWh 1615 kWh £1,499 £162 £1,660 £25,726 15.5 yrs £7,481

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 LL37

Figures below are tailored to LL37 — click through for full league tables.

Big-Roof Britain Rank #49 of 2182
7.1 kWp (UK avg 5.1 kWp)
~15 panels (≈430 W)
Solar Payback Index Rank #1996 of 2997
11.7 years (UK avg 11.3 years)
~£1,040 /yr • £12,207 upfront
Standing-Charge Drag Rank #2164 of 2997
24.5% (UK avg 21.7%) drag on savings
£255 fixed • ~£1,040 /yr value

Your Area at a Glance

Your Electricity Rate
27.72p/kWh
Daily Fixed Charge
69.95p/day
Local Sunshine
878kWh/kW
A 1 kW system generates ~878 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: 70% • Flats: 3% • Bungalows: 26% Based on 206 properties

Coverage

Gwynedd (100%)

Areas Covered

Arthog a Llangelynnin, De Dolgellau

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

LL38 (Gwynedd)
≈4.0 km away
Local sunshine: ~846 kWh/kWp · -4% vs LL37
LL42 (Gwynedd)
≈6.7 km away
Local sunshine: ~864 kWh/kWp · -2% vs LL37
LL39 (Gwynedd)
≈6.9 km away
Local sunshine: ~825 kWh/kWp · -6% vs LL37
LL36 (Gwynedd)
≈8.7 km away
Local sunshine: ~940 kWh/kWp · +7% vs LL37
LL43 (Gwynedd)
≈12.1 km away
Local sunshine: ~875 kWh/kWp · -0% vs LL37
LL44 (Gwynedd)
≈13.7 km away
Local sunshine: ~875 kWh/kWp · -0% vs LL37

Similar sunshine across the UK

EH1 (City of Edinburgh)
~878 kWh/kWp · +0% vs LL37
KA23 (North Ayrshire)
~878 kWh/kWp · -0% vs LL37
BT68 (Mid Ulster)
~878 kWh/kWp · +0% vs LL37