Solar explained to clever people by people who are not trying to be clever

Solar Panels in LL60 (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
13.1 years
After this, it's pure profit
Upfront Cost
£12,207
What you pay to get started
Annual Benefit
£930
What you save every year
Profit Over 25 Years
£11,036
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

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 907 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)
907 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: £775, Upfront: £10,173, Break-even: 13.1 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1814 kWh 725 kWh 1088 kWh £201 £109 £310 £4,069 13.1 yrs £2,129
3 kW 2720 kWh 1088 kWh 1632 kWh £302 £163 £465 £6,104 13.1 yrs £3,194
4 kW 3627 kWh 1451 kWh 2176 kWh £402 £218 £620 £8,138 13.1 yrs £4,258
5 kW 4534 kWh 1814 kWh 2720 kWh £503 £272 £775 £10,173 13.1 yrs £5,323
6 kW 5441 kWh 2176 kWh 3265 kWh £603 £326 £930 £12,207 13.1 yrs £6,388
7 kW 6348 kWh 2539 kWh 3809 kWh £704 £381 £1,085 £14,242 13.1 yrs £7,452
8 kW 7254 kWh 2902 kWh 4353 kWh £804 £435 £1,240 £16,276 13.1 yrs £8,517

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: £935, Upfront: £12,273, Break-even: 13.1 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1814 kWh 1088 kWh 725 kWh £302 £73 £374 £6,169 16.5 yrs £1,315
3 kW 2720 kWh 1632 kWh 1088 kWh £452 £109 £561 £8,204 14.6 yrs £3,022
4 kW 3627 kWh 2176 kWh 1451 kWh £603 £145 £748 £10,238 13.7 yrs £4,729
5 kW 4534 kWh 2720 kWh 1814 kWh £754 £181 £935 £12,273 13.1 yrs £6,437
6 kW 5441 kWh 3265 kWh 2176 kWh £905 £218 £1,123 £14,307 12.7 yrs £8,144
7 kW 6348 kWh 3809 kWh 2539 kWh £1,056 £254 £1,310 £16,342 12.5 yrs £9,851
8 kW 7254 kWh 4353 kWh 2902 kWh £1,207 £290 £1,497 £18,376 12.3 yrs £11,559

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: £1,016, Upfront: £13,673, Break-even: 13.5 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1814 kWh 1270 kWh 544 kWh £352 £54 £406 £7,569 18.6 yrs £557
3 kW 2720 kWh 1904 kWh 816 kWh £528 £82 £609 £9,604 15.8 yrs £2,586
4 kW 3627 kWh 2539 kWh 1088 kWh £704 £109 £813 £11,638 14.3 yrs £4,615
5 kW 4534 kWh 3174 kWh 1360 kWh £880 £136 £1,016 £13,673 13.5 yrs £6,644
6 kW 5441 kWh 3809 kWh 1632 kWh £1,056 £163 £1,219 £15,707 12.9 yrs £8,672
7 kW 6348 kWh 4443 kWh 1904 kWh £1,232 £190 £1,422 £17,742 12.5 yrs £10,701
8 kW 7254 kWh 5078 kWh 2176 kWh £1,408 £218 £1,625 £19,776 12.2 yrs £12,730

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: £1,040, Upfront: £15,423, Break-even: 14.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1814 kWh 1324 kWh 490 kWh £367 £49 £416 £9,319 22.4 yrs £-1,000
3 kW 2720 kWh 1986 kWh 735 kWh £550 £73 £624 £11,354 18.2 yrs £1,125
4 kW 3627 kWh 2648 kWh 979 kWh £734 £98 £832 £13,388 16.1 yrs £3,251
5 kW 4534 kWh 3310 kWh 1224 kWh £917 £122 £1,040 £15,423 14.8 yrs £5,376
6 kW 5441 kWh 3972 kWh 1469 kWh £1,101 £147 £1,248 £17,457 14.0 yrs £7,501
7 kW 6348 kWh 4634 kWh 1714 kWh £1,284 £171 £1,456 £19,492 13.4 yrs £9,626
8 kW 7254 kWh 5296 kWh 1959 kWh £1,468 £196 £1,664 £21,526 12.9 yrs £11,751

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: £1,056, Upfront: £17,173, Break-even: 16.3 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1814 kWh 1360 kWh 453 kWh £377 £45 £422 £11,069 26.2 yrs £-2,621
3 kW 2720 kWh 2040 kWh 680 kWh £566 £68 £634 £13,104 20.7 yrs £-432
4 kW 3627 kWh 2720 kWh 907 kWh £754 £91 £845 £15,138 17.9 yrs £1,758
5 kW 4534 kWh 3401 kWh 1134 kWh £943 £113 £1,056 £17,173 16.3 yrs £3,947
6 kW 5441 kWh 4081 kWh 1360 kWh £1,131 £136 £1,267 £19,207 15.2 yrs £6,136
7 kW 6348 kWh 4761 kWh 1587 kWh £1,320 £159 £1,478 £21,242 14.4 yrs £8,326
8 kW 7254 kWh 5441 kWh 1814 kWh £1,508 £181 £1,690 £23,276 13.8 yrs £10,515

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: £1,072, Upfront: £19,623, 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 1814 kWh 1396 kWh 417 kWh £387 £42 £429 £13,519 31.5 yrs £-4,943
3 kW 2720 kWh 2095 kWh 626 kWh £581 £63 £643 £15,554 24.2 yrs £-2,689
4 kW 3627 kWh 2793 kWh 834 kWh £774 £83 £858 £17,588 20.5 yrs £-435
5 kW 4534 kWh 3491 kWh 1043 kWh £968 £104 £1,072 £19,623 18.3 yrs £1,818
6 kW 5441 kWh 4189 kWh 1251 kWh £1,161 £125 £1,286 £21,657 16.8 yrs £4,072
7 kW 6348 kWh 4888 kWh 1460 kWh £1,355 £146 £1,501 £23,692 15.8 yrs £6,326
8 kW 7254 kWh 5586 kWh 1669 kWh £1,548 £167 £1,715 £25,726 15.0 yrs £8,579

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.

Your Area at a Glance

Your Electricity Rate
27.72p/kWh
Daily Fixed Charge
69.95p/day
Local Sunshine
907kWh/kW
A 1 kW system generates ~907 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: 60% • Flats: 1% • Bungalows: 40% Based on 861 properties

Coverage

Isle of Anglesey (95%)|Gwynedd (5%)

Areas Covered

Bodowyr, Bro Aberffraw, Aethwy, Canol Bangor

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.