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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in LL45 (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
14.3 years
After this, it's pure profit
Upfront Cost
£12,207
What you pay to get started
Annual Benefit
£856
What you save every year
Profit Over 25 Years
£9,188
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 835 kWh/kW — 95 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 835 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)
835 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: £713, 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 1669 kWh 668 kWh 1002 kWh £185 £100 £285 £4,069 14.3 yrs £1,636
3 kW 2504 kWh 1002 kWh 1502 kWh £278 £150 £428 £6,104 14.3 yrs £2,455
4 kW 3339 kWh 1336 kWh 2003 kWh £370 £200 £571 £8,138 14.3 yrs £3,273
5 kW 4174 kWh 1669 kWh 2504 kWh £463 £250 £713 £10,173 14.3 yrs £4,091
6 kW 5008 kWh 2003 kWh 3005 kWh £555 £300 £856 £12,207 14.3 yrs £4,909
7 kW 5843 kWh 2337 kWh 3506 kWh £648 £351 £998 £14,242 14.3 yrs £5,728
8 kW 6678 kWh 2671 kWh 4007 kWh £740 £401 £1,141 £16,276 14.3 yrs £6,546

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: £861, 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 1669 kWh 1002 kWh 668 kWh £278 £67 £344 £6,169 17.9 yrs £720
3 kW 2504 kWh 1502 kWh 1002 kWh £416 £100 £517 £8,204 15.9 yrs £2,130
4 kW 3339 kWh 2003 kWh 1336 kWh £555 £134 £689 £10,238 14.9 yrs £3,540
5 kW 4174 kWh 2504 kWh 1669 kWh £694 £167 £861 £12,273 14.3 yrs £4,949
6 kW 5008 kWh 3005 kWh 2003 kWh £833 £200 £1,033 £14,307 13.8 yrs £6,359
7 kW 5843 kWh 3506 kWh 2337 kWh £972 £234 £1,206 £16,342 13.6 yrs £7,769
8 kW 6678 kWh 4007 kWh 2671 kWh £1,111 £267 £1,378 £18,376 13.3 yrs £9,179

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: £935, Upfront: £13,673, 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 1669 kWh 1169 kWh 501 kWh £324 £50 £374 £7,569 20.2 yrs £-89
3 kW 2504 kWh 1753 kWh 751 kWh £486 £75 £561 £9,604 17.1 yrs £1,617
4 kW 3339 kWh 2337 kWh 1002 kWh £648 £100 £748 £11,638 15.6 yrs £3,323
5 kW 4174 kWh 2922 kWh 1252 kWh £810 £125 £935 £13,673 14.6 yrs £5,029
6 kW 5008 kWh 3506 kWh 1502 kWh £972 £150 £1,122 £15,707 14.0 yrs £6,734
7 kW 5843 kWh 4090 kWh 1753 kWh £1,134 £175 £1,309 £17,742 13.6 yrs £8,440
8 kW 6678 kWh 4674 kWh 2003 kWh £1,296 £200 £1,496 £19,776 13.2 yrs £10,146

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: £957, Upfront: £15,423, Break-even: 16.1 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1669 kWh 1219 kWh 451 kWh £338 £45 £383 £9,319 24.3 yrs £-1,661
3 kW 2504 kWh 1828 kWh 676 kWh £507 £68 £574 £11,354 19.8 yrs £133
4 kW 3339 kWh 2437 kWh 901 kWh £676 £90 £766 £13,388 17.5 yrs £1,928
5 kW 4174 kWh 3047 kWh 1127 kWh £845 £113 £957 £15,423 16.1 yrs £3,722
6 kW 5008 kWh 3656 kWh 1352 kWh £1,013 £135 £1,149 £17,457 15.2 yrs £5,517
7 kW 5843 kWh 4265 kWh 1578 kWh £1,182 £158 £1,340 £19,492 14.5 yrs £7,311
8 kW 6678 kWh 4875 kWh 1803 kWh £1,351 £180 £1,532 £21,526 14.1 yrs £9,106

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: £972, Upfront: £17,173, Break-even: 17.7 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1669 kWh 1252 kWh 417 kWh £347 £42 £389 £11,069 28.5 yrs £-3,293
3 kW 2504 kWh 1878 kWh 626 kWh £521 £63 £583 £13,104 22.5 yrs £-1,439
4 kW 3339 kWh 2504 kWh 835 kWh £694 £83 £778 £15,138 19.5 yrs £414
5 kW 4174 kWh 3130 kWh 1043 kWh £868 £104 £972 £17,173 17.7 yrs £2,268
6 kW 5008 kWh 3756 kWh 1252 kWh £1,041 £125 £1,166 £19,207 16.5 yrs £4,122
7 kW 5843 kWh 4382 kWh 1461 kWh £1,215 £146 £1,361 £21,242 15.6 yrs £5,975
8 kW 6678 kWh 5008 kWh 1669 kWh £1,388 £167 £1,555 £23,276 15.0 yrs £7,829

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: £987, Upfront: £19,623, Break-even: 19.9 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1669 kWh 1285 kWh 384 kWh £356 £38 £395 £13,519 34.2 yrs £-5,624
3 kW 2504 kWh 1928 kWh 576 kWh £534 £58 £592 £15,554 26.3 yrs £-3,712
4 kW 3339 kWh 2571 kWh 768 kWh £713 £77 £789 £17,588 22.3 yrs £-1,799
5 kW 4174 kWh 3214 kWh 960 kWh £891 £96 £987 £19,623 19.9 yrs £114
6 kW 5008 kWh 3856 kWh 1152 kWh £1,069 £115 £1,184 £21,657 18.3 yrs £2,027
7 kW 5843 kWh 4499 kWh 1344 kWh £1,247 £134 £1,382 £23,692 17.1 yrs £3,939
8 kW 6678 kWh 5142 kWh 1536 kWh £1,425 £154 £1,579 £25,726 16.3 yrs £5,852

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 LL45

Figures below are tailored to LL45 — click through for full league tables.

Big-Roof Britain Rank #109 of 2182
6.5 kWp (UK avg 5.1 kWp)
~14 panels (≈430 W)
Solar Payback Index Rank #2569 of 2997
12.3 years (UK avg 11.3 years)
~£989 /yr • £12,207 upfront
Standing-Charge Drag Rank #2363 of 2997
25.8% (UK avg 21.7%) drag on savings
£255 fixed • ~£989 /yr value

Your Area at a Glance

Your Electricity Rate
27.72p/kWh
Daily Fixed Charge
69.95p/day
Local Sunshine
835kWh/kW
A 1 kW system generates ~835 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: 69% • Flats: 3% • Bungalows: 27% Based on 207 properties

Coverage

Gwynedd (100%)

Areas Covered

Harlech a Llanbedr, Dyffryn Ardudwy, Abermaw

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

LL44 (Gwynedd)
≈3.4 km away
Local sunshine: ~875 kWh/kWp · +5% vs LL45
LL46 (Gwynedd)
≈4.3 km away
Local sunshine: ~830 kWh/kWp · -1% vs LL45
LL43 (Gwynedd)
≈5.0 km away
Local sunshine: ~875 kWh/kWp · +5% vs LL45
LL47 (Gwynedd)
≈9.3 km away
Local sunshine: ~795 kWh/kWp · -5% vs LL45
LL42 (Gwynedd)
≈11.0 km away
Local sunshine: ~864 kWh/kWp · +4% vs LL45
LL49 (Gwynedd)
≈12.3 km away
Local sunshine: ~827 kWh/kWp · -1% vs LL45

Similar sunshine across the UK

BT94 (Fermanagh and Omagh)
~835 kWh/kWp · +0% vs LL45
PA15 (Inverclyde)
~835 kWh/kWp · -0% vs LL45
G4 (Glasgow City)
~835 kWh/kWp · -0% vs LL45