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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in LL27 (Conwy)

See if solar pays off for you in Conwy — 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
15.3 years
After this, it's pure profit
Upfront Cost
£12,207
What you pay to get started
Annual Benefit
£797
What you save every year
Profit Over 25 Years
£7,708
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 777 kWh/kW — 153 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 777 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)
777 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: £664, Upfront: £10,173, 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 1554 kWh 622 kWh 932 kWh £172 £93 £266 £4,069 15.3 yrs £1,242
3 kW 2331 kWh 932 kWh 1399 kWh £258 £140 £398 £6,104 15.3 yrs £1,862
4 kW 3108 kWh 1243 kWh 1865 kWh £345 £186 £531 £8,138 15.3 yrs £2,483
5 kW 3885 kWh 1554 kWh 2331 kWh £431 £233 £664 £10,173 15.3 yrs £3,104
6 kW 4662 kWh 1865 kWh 2797 kWh £517 £280 £797 £12,207 15.3 yrs £3,725
7 kW 5439 kWh 2175 kWh 3263 kWh £603 £326 £929 £14,242 15.3 yrs £4,346
8 kW 6216 kWh 2486 kWh 3729 kWh £689 £373 £1,062 £16,276 15.3 yrs £4,967

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: £802, Upfront: £12,273, 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 1554 kWh 932 kWh 622 kWh £258 £62 £321 £6,169 19.2 yrs £243
3 kW 2331 kWh 1399 kWh 932 kWh £388 £93 £481 £8,204 17.1 yrs £1,415
4 kW 3108 kWh 1865 kWh 1243 kWh £517 £124 £641 £10,238 16.0 yrs £2,586
5 kW 3885 kWh 2331 kWh 1554 kWh £646 £155 £802 £12,273 15.3 yrs £3,758
6 kW 4662 kWh 2797 kWh 1865 kWh £775 £186 £962 £14,307 14.9 yrs £4,929
7 kW 5439 kWh 3263 kWh 2175 kWh £905 £218 £1,122 £16,342 14.6 yrs £6,101
8 kW 6216 kWh 3729 kWh 2486 kWh £1,034 £249 £1,282 £18,376 14.3 yrs £7,272

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: £870, Upfront: £13,673, Break-even: 15.7 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1554 kWh 1088 kWh 466 kWh £302 £47 £348 £7,569 21.7 yrs £-606
3 kW 2331 kWh 1632 kWh 699 kWh £452 £70 £522 £9,604 18.4 yrs £841
4 kW 3108 kWh 2175 kWh 932 kWh £603 £93 £696 £11,638 16.7 yrs £2,288
5 kW 3885 kWh 2719 kWh 1165 kWh £754 £117 £870 £13,673 15.7 yrs £3,734
6 kW 4662 kWh 3263 kWh 1399 kWh £905 £140 £1,044 £15,707 15.0 yrs £5,181
7 kW 5439 kWh 3807 kWh 1632 kWh £1,055 £163 £1,218 £17,742 14.6 yrs £6,628
8 kW 6216 kWh 4351 kWh 1865 kWh £1,206 £186 £1,393 £19,776 14.2 yrs £8,075

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: £891, Upfront: £15,423, Break-even: 17.3 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1554 kWh 1134 kWh 420 kWh £314 £42 £356 £9,319 26.1 yrs £-2,191
3 kW 2331 kWh 1702 kWh 629 kWh £472 £63 £535 £11,354 21.2 yrs £-662
4 kW 3108 kWh 2269 kWh 839 kWh £629 £84 £713 £13,388 18.8 yrs £868
5 kW 3885 kWh 2836 kWh 1049 kWh £786 £105 £891 £15,423 17.3 yrs £2,397
6 kW 4662 kWh 3403 kWh 1259 kWh £943 £126 £1,069 £17,457 16.3 yrs £3,927
7 kW 5439 kWh 3970 kWh 1468 kWh £1,101 £147 £1,247 £19,492 15.6 yrs £5,456
8 kW 6216 kWh 4537 kWh 1678 kWh £1,258 £168 £1,426 £21,526 15.1 yrs £6,986

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: £905, Upfront: £17,173, Break-even: 19.0 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1554 kWh 1165 kWh 388 kWh £323 £39 £362 £11,069 30.6 yrs £-3,831
3 kW 2331 kWh 1748 kWh 583 kWh £485 £58 £543 £13,104 24.1 yrs £-2,246
4 kW 3108 kWh 2331 kWh 777 kWh £646 £78 £724 £15,138 20.9 yrs £-662
5 kW 3885 kWh 2914 kWh 971 kWh £808 £97 £905 £17,173 19.0 yrs £923
6 kW 4662 kWh 3496 kWh 1165 kWh £969 £117 £1,086 £19,207 17.7 yrs £2,507
7 kW 5439 kWh 4079 kWh 1360 kWh £1,131 £136 £1,267 £21,242 16.8 yrs £4,092
8 kW 6216 kWh 4662 kWh 1554 kWh £1,292 £155 £1,448 £23,276 16.1 yrs £5,677

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: £919, Upfront: £19,623, Break-even: 21.4 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1554 kWh 1197 kWh 357 kWh £332 £36 £367 £13,519 36.8 yrs £-6,171
3 kW 2331 kWh 1795 kWh 536 kWh £498 £54 £551 £15,554 28.2 yrs £-4,531
4 kW 3108 kWh 2393 kWh 715 kWh £663 £71 £735 £17,588 23.9 yrs £-2,891
5 kW 3885 kWh 2991 kWh 894 kWh £829 £89 £919 £19,623 21.4 yrs £-1,252
6 kW 4662 kWh 3590 kWh 1072 kWh £995 £107 £1,102 £21,657 19.6 yrs £388
7 kW 5439 kWh 4188 kWh 1251 kWh £1,161 £125 £1,286 £23,692 18.4 yrs £2,027
8 kW 6216 kWh 4786 kWh 1430 kWh £1,327 £143 £1,470 £25,726 17.5 yrs £3,667

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 LL27

Figures below are tailored to LL27 — click through for full league tables.

Big-Roof Britain Rank #637 of 2182
5.4 kWp (UK avg 5.1 kWp)
~11 panels (≈430 W)
Solar Payback Index Rank #2889 of 2997
13.3 years (UK avg 11.3 years)
~£921 /yr • £12,207 upfront
Standing-Charge Drag Rank #2496 of 2997
27.7% (UK avg 21.7%) drag on savings
£255 fixed • ~£921 /yr value

Your Area at a Glance

Your Electricity Rate
27.72p/kWh
Daily Fixed Charge
69.95p/day
Local Sunshine
777kWh/kW
A 1 kW system generates ~777 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: 73% • Flats: 14% • Bungalows: 13% Based on 226 properties

Coverage

Conwy (100%)

Areas Covered

Betws-y-Coed and Trefriw, Llanrwst a Llanddoged

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

LL26 (Conwy)
≈2.5 km away
Local sunshine: ~870 kWh/kWp · +12% vs LL27
LL24 (Conwy)
≈11.4 km away
Local sunshine: ~811 kWh/kWp · +4% vs LL27
LL25 (Conwy)
≈11.6 km away
Local sunshine: ~823 kWh/kWp · +6% vs LL27
LL32 (Conwy)
≈13.9 km away
Local sunshine: ~906 kWh/kWp · +17% vs LL27
LL34 (Conwy)
≈14.5 km away
Local sunshine: ~871 kWh/kWp · +12% vs LL27
LL33 (Conwy)
≈15.0 km away
Local sunshine: ~886 kWh/kWp · +14% vs LL27

Similar sunshine across the UK

PA64 (Argyll and Bute)
~778 kWh/kWp · +0% vs LL27
PH26 (Highland)
~778 kWh/kWp · +0% vs LL27
PA37 (Argyll and Bute)
~779 kWh/kWp · +0% vs LL27