Solar explained to clever people by people who are not trying to be clever
Home Regions
Insights
Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in LL77 (Isle of Anglesey)

See if solar pays off for you in Isle of Anglesey — 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
12.3 years
After this, it's pure profit
Upfront Cost
£10,173
What you pay to get started
Annual Benefit
£825
What you save every year
Profit Over 25 Years
£10,455
After paying itself off, you're this much ahead

Ready to Get Started?

Get your free quote from Blue Ape Renewables. They'll connect you with MCS-certified installers in your area and handle all the paperwork.

Get Solar Quote →
4.8★ Trustpilot • Octopus Energy trusted partner • MCS certified • No obligation
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 966 kWh/kW — 36 above the regional median (930).

Read the full story

A typical roof here lands around 5.0 kW, with most eligible homes comfortably fitting within 3–6 kW. Each kilowatt of panels produces roughly 966 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)
966 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: £825, Upfront: £10,173, Break-even: 12.3 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1931 kWh 773 kWh 1159 kWh £214 £116 £330 £4,069 12.3 yrs £2,532
3 kW 2897 kWh 1159 kWh 1738 kWh £321 £174 £495 £6,104 12.3 yrs £3,798
4 kW 3863 kWh 1545 kWh 2318 kWh £428 £232 £660 £8,138 12.3 yrs £5,064
5 kW 4829 kWh 1931 kWh 2897 kWh £535 £290 £825 £10,173 12.3 yrs £6,330
6 kW 5794 kWh 2318 kWh 3477 kWh £642 £348 £990 £12,207 12.3 yrs £7,596
7 kW 6760 kWh 2704 kWh 4056 kWh £750 £406 £1,155 £14,242 12.3 yrs £8,862
8 kW 7726 kWh 3090 kWh 4635 kWh £857 £464 £1,320 £16,276 12.3 yrs £10,127

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: £996, Upfront: £12,273, Break-even: 12.3 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1931 kWh 1159 kWh 773 kWh £321 £77 £398 £6,169 15.5 yrs £1,801
3 kW 2897 kWh 1738 kWh 1159 kWh £482 £116 £598 £8,204 13.7 yrs £3,751
4 kW 3863 kWh 2318 kWh 1545 kWh £642 £155 £797 £10,238 12.8 yrs £5,702
5 kW 4829 kWh 2897 kWh 1931 kWh £803 £193 £996 £12,273 12.3 yrs £7,652
6 kW 5794 kWh 3477 kWh 2318 kWh £964 £232 £1,195 £14,307 12.0 yrs £9,603
7 kW 6760 kWh 4056 kWh 2704 kWh £1,124 £270 £1,395 £16,342 11.7 yrs £11,553
8 kW 7726 kWh 4635 kWh 3090 kWh £1,285 £309 £1,594 £18,376 11.5 yrs £13,503

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: £1,082, Upfront: £13,673, 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 1931 kWh 1352 kWh 579 kWh £375 £58 £433 £7,569 17.5 yrs £1,085
3 kW 2897 kWh 2028 kWh 869 kWh £562 £87 £649 £9,604 14.8 yrs £3,378
4 kW 3863 kWh 2704 kWh 1159 kWh £750 £116 £865 £11,638 13.4 yrs £5,671
5 kW 4829 kWh 3380 kWh 1449 kWh £937 £145 £1,082 £13,673 12.6 yrs £7,963
6 kW 5794 kWh 4056 kWh 1738 kWh £1,124 £174 £1,298 £15,707 12.1 yrs £10,256
7 kW 6760 kWh 4732 kWh 2028 kWh £1,312 £203 £1,515 £17,742 11.7 yrs £12,549
8 kW 7726 kWh 5408 kWh 2318 kWh £1,499 £232 £1,731 £19,776 11.4 yrs £14,842

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: £1,107, Upfront: £15,423, 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 1931 kWh 1410 kWh 521 kWh £391 £52 £443 £9,319 21.0 yrs £-459
3 kW 2897 kWh 2115 kWh 782 kWh £586 £78 £664 £11,354 17.1 yrs £1,936
4 kW 3863 kWh 2820 kWh 1043 kWh £782 £104 £886 £13,388 15.1 yrs £4,331
5 kW 4829 kWh 3525 kWh 1304 kWh £977 £130 £1,107 £15,423 13.9 yrs £6,727
6 kW 5794 kWh 4230 kWh 1564 kWh £1,173 £156 £1,329 £17,457 13.1 yrs £9,122
7 kW 6760 kWh 4935 kWh 1825 kWh £1,368 £183 £1,550 £19,492 12.6 yrs £11,518
8 kW 7726 kWh 5640 kWh 2086 kWh £1,563 £209 £1,772 £21,526 12.1 yrs £13,913

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: £1,125, Upfront: £17,173, 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 1931 kWh 1449 kWh 483 kWh £402 £48 £450 £11,069 24.6 yrs £-2,072
3 kW 2897 kWh 2173 kWh 724 kWh £602 £72 £675 £13,104 19.4 yrs £391
4 kW 3863 kWh 2897 kWh 966 kWh £803 £97 £900 £15,138 16.8 yrs £2,855
5 kW 4829 kWh 3621 kWh 1207 kWh £1,004 £121 £1,125 £17,173 15.3 yrs £5,319
6 kW 5794 kWh 4346 kWh 1449 kWh £1,205 £145 £1,349 £19,207 14.2 yrs £7,783
7 kW 6760 kWh 5070 kWh 1690 kWh £1,405 £169 £1,574 £21,242 13.5 yrs £10,247
8 kW 7726 kWh 5794 kWh 1931 kWh £1,606 £193 £1,799 £23,276 12.9 yrs £12,711

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: £1,142, Upfront: £19,623, Break-even: 17.2 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1931 kWh 1487 kWh 444 kWh £412 £44 £457 £13,519 29.6 yrs £-4,385
3 kW 2897 kWh 2231 kWh 666 kWh £618 £67 £685 £15,554 22.7 yrs £-1,853
4 kW 3863 kWh 2974 kWh 888 kWh £825 £89 £913 £17,588 19.3 yrs £679
5 kW 4829 kWh 3718 kWh 1111 kWh £1,031 £111 £1,142 £19,623 17.2 yrs £3,211
6 kW 5794 kWh 4462 kWh 1333 kWh £1,237 £133 £1,370 £21,657 15.8 yrs £5,744
7 kW 6760 kWh 5205 kWh 1555 kWh £1,443 £155 £1,598 £23,692 14.8 yrs £8,276
8 kW 7726 kWh 5949 kWh 1777 kWh £1,649 £178 £1,827 £25,726 14.1 yrs £10,808

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 LL77

Figures below are tailored to LL77 — click through for full league tables.

Big-Roof Britain Rank #765 of 2182
5.3 kWp (UK avg 5.1 kWp)
~11 panels (≈430 W)
Solar Payback Index Rank #815 of 2997
10.7 years (UK avg 11.3 years)
~£953 /yr • £10,173 upfront
Standing-Charge Drag Rank #2409 of 2997
26.8% (UK avg 21.7%) drag on savings
£255 fixed • ~£953 /yr value

Your Area at a Glance

Your Electricity Rate
27.72p/kWh
Daily Fixed Charge
69.95p/day
Local Sunshine
966kWh/kW
A 1 kW system generates ~966 kWh per year. A typical home uses ~2,700 kWh per year.
Typical System Size
5.0kW
For houses & bungalows in this area

Local Property Data

Property Types

Houses: 58% • Flats: 22% • Bungalows: 19% Based on 2,489 properties

Coverage

Isle of Anglesey (100%)

Areas Covered

Canolbarth Môn, Cefni, Aethwy, Lligwy

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

LL60 (Isle of Anglesey)
≈4.6 km away
Local sunshine: ~907 kWh/kWp · -6% vs LL77
LL75 (Isle of Anglesey)
≈6.8 km away
Local sunshine: ~931 kWh/kWp · -4% vs LL77
LL76 (Isle of Anglesey)
≈6.8 km away
Local sunshine: ~933 kWh/kWp · -3% vs LL77
LL62 (Isle of Anglesey)
≈7.4 km away
Local sunshine: ~986 kWh/kWp · +2% vs LL77
LL78 (Isle of Anglesey)
≈7.7 km away
Local sunshine: ~947 kWh/kWp · -2% vs LL77
LL61 (Isle of Anglesey)
≈8.4 km away
Local sunshine: ~884 kWh/kWp · -8% vs LL77

Similar sunshine across the UK

WR3 (Worcester)
~966 kWh/kWp · +0% vs LL77
NP4 (Torfaen)
~966 kWh/kWp · +0% vs LL77
B94 (Stratford-on-Avon)
~965 kWh/kWp · -0% vs LL77