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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in LL33 (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
13.4 years
After this, it's pure profit
Upfront Cost
£10,173
What you pay to get started
Annual Benefit
£757
What you save every year
Profit Over 25 Years
£8,755
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 886 kWh/kW — 44 below 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 886 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)
886 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: £757, Upfront: £10,173, Break-even: 13.4 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1772 kWh 709 kWh 1063 kWh £197 £106 £303 £4,069 13.4 yrs £1,988
3 kW 2658 kWh 1063 kWh 1595 kWh £295 £160 £454 £6,104 13.4 yrs £2,982
4 kW 3545 kWh 1418 kWh 2127 kWh £393 £213 £606 £8,138 13.4 yrs £3,976
5 kW 4431 kWh 1772 kWh 2658 kWh £491 £266 £757 £10,173 13.4 yrs £4,970
6 kW 5317 kWh 2127 kWh 3190 kWh £590 £319 £909 £12,207 13.4 yrs £5,964
7 kW 6203 kWh 2481 kWh 3722 kWh £688 £372 £1,060 £14,242 13.4 yrs £6,958
8 kW 7089 kWh 2836 kWh 4253 kWh £786 £425 £1,211 £16,276 13.4 yrs £7,952

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: £914, Upfront: £12,273, Break-even: 13.4 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1772 kWh 1063 kWh 709 kWh £295 £71 £366 £6,169 16.9 yrs £1,144
3 kW 2658 kWh 1595 kWh 1063 kWh £442 £106 £548 £8,204 15.0 yrs £2,766
4 kW 3545 kWh 2127 kWh 1418 kWh £590 £142 £731 £10,238 14.0 yrs £4,388
5 kW 4431 kWh 2658 kWh 1772 kWh £737 £177 £914 £12,273 13.4 yrs £6,010
6 kW 5317 kWh 3190 kWh 2127 kWh £884 £213 £1,097 £14,307 13.0 yrs £7,632
7 kW 6203 kWh 3722 kWh 2481 kWh £1,032 £248 £1,280 £16,342 12.8 yrs £9,254
8 kW 7089 kWh 4253 kWh 2836 kWh £1,179 £284 £1,463 £18,376 12.6 yrs £10,876

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: £993, Upfront: £13,673, Break-even: 13.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1772 kWh 1241 kWh 532 kWh £344 £53 £397 £7,569 19.1 yrs £372
3 kW 2658 kWh 1861 kWh 798 kWh £516 £80 £596 £9,604 16.1 yrs £2,308
4 kW 3545 kWh 2481 kWh 1063 kWh £688 £106 £794 £11,638 14.7 yrs £4,244
5 kW 4431 kWh 3101 kWh 1329 kWh £860 £133 £993 £13,673 13.8 yrs £6,181
6 kW 5317 kWh 3722 kWh 1595 kWh £1,032 £160 £1,191 £15,707 13.2 yrs £8,117
7 kW 6203 kWh 4342 kWh 1861 kWh £1,204 £186 £1,390 £17,742 12.8 yrs £10,053
8 kW 7089 kWh 4962 kWh 2127 kWh £1,376 £213 £1,588 £19,776 12.5 yrs £11,989

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: £1,016, Upfront: £15,423, Break-even: 15.2 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1772 kWh 1294 kWh 479 kWh £359 £48 £406 £9,319 22.9 yrs £-1,189
3 kW 2658 kWh 1941 kWh 718 kWh £538 £72 £610 £11,354 18.6 yrs £841
4 kW 3545 kWh 2588 kWh 957 kWh £717 £96 £813 £13,388 16.5 yrs £2,871
5 kW 4431 kWh 3234 kWh 1196 kWh £897 £120 £1,016 £15,423 15.2 yrs £4,902
6 kW 5317 kWh 3881 kWh 1436 kWh £1,076 £144 £1,219 £17,457 14.3 yrs £6,932
7 kW 6203 kWh 4528 kWh 1675 kWh £1,255 £167 £1,423 £19,492 13.7 yrs £8,962
8 kW 7089 kWh 5175 kWh 1914 kWh £1,435 £191 £1,626 £21,526 13.2 yrs £10,993

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: £1,032, Upfront: £17,173, Break-even: 16.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1772 kWh 1329 kWh 443 kWh £368 £44 £413 £11,069 26.8 yrs £-2,814
3 kW 2658 kWh 1994 kWh 665 kWh £553 £66 £619 £13,104 21.2 yrs £-721
4 kW 3545 kWh 2658 kWh 886 kWh £737 £89 £826 £15,138 18.3 yrs £1,373
5 kW 4431 kWh 3323 kWh 1108 kWh £921 £111 £1,032 £17,173 16.6 yrs £3,466
6 kW 5317 kWh 3988 kWh 1329 kWh £1,105 £133 £1,238 £19,207 15.5 yrs £5,559
7 kW 6203 kWh 4652 kWh 1551 kWh £1,290 £155 £1,445 £21,242 14.7 yrs £7,652
8 kW 7089 kWh 5317 kWh 1772 kWh £1,474 £177 £1,651 £23,276 14.1 yrs £9,745

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: £1,048, Upfront: £19,623, Break-even: 18.7 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1772 kWh 1365 kWh 408 kWh £378 £41 £419 £13,519 32.3 yrs £-5,138
3 kW 2658 kWh 2047 kWh 611 kWh £567 £61 £629 £15,554 24.7 yrs £-2,982
4 kW 3545 kWh 2729 kWh 815 kWh £757 £82 £838 £17,588 21.0 yrs £-826
5 kW 4431 kWh 3412 kWh 1019 kWh £946 £102 £1,048 £19,623 18.7 yrs £1,330
6 kW 5317 kWh 4094 kWh 1223 kWh £1,135 £122 £1,257 £21,657 17.2 yrs £3,486
7 kW 6203 kWh 4776 kWh 1427 kWh £1,324 £143 £1,467 £23,692 16.2 yrs £5,642
8 kW 7089 kWh 5459 kWh 1630 kWh £1,513 £163 £1,676 £25,726 15.3 yrs £7,798

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 LL33

Figures below are tailored to LL33 — click through for full league tables.

Big-Roof Britain Rank #1092 of 2182
5.0 kWp (UK avg 5.1 kWp)
~11 panels (≈430 W)
Solar Payback Index Rank #1865 of 2997
11.6 years (UK avg 11.3 years)
~£875 /yr • £10,173 upfront
Standing-Charge Drag Rank #2623 of 2997
29.2% (UK avg 21.7%) drag on savings
£255 fixed • ~£875 /yr value

Your Area at a Glance

Your Electricity Rate
27.72p/kWh
Daily Fixed Charge
69.95p/day
Local Sunshine
886kWh/kW
A 1 kW system generates ~886 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: 60% • Flats: 24% • Bungalows: 14% Based on 939 properties

Coverage

Conwy (85%)|Gwynedd (15%)

Areas Covered

Bryn, Pandy, Arllechwedd, 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.

Compare nearby areas

Nearby in North Wales and Mersey

LL34 (Conwy)
≈4.2 km away
Local sunshine: ~871 kWh/kWp · -2% vs LL33
LL58 (Isle of Anglesey)
≈8.5 km away
Local sunshine: ~819 kWh/kWp · -8% vs LL33
LL32 (Conwy)
≈9.4 km away
Local sunshine: ~906 kWh/kWp · +2% vs LL33
LL57 (Gwynedd)
≈10.7 km away
Local sunshine: ~792 kWh/kWp · -11% vs LL33
LL31 (Conwy)
≈11.7 km away
Local sunshine: ~908 kWh/kWp · +2% vs LL33
LL30 (Conwy)
≈12.3 km away
Local sunshine: ~919 kWh/kWp · +4% vs LL33

Similar sunshine across the UK

KA8 (South Ayrshire)
~886 kWh/kWp · -0% vs LL33
SA40 (Carmarthenshire)
~886 kWh/kWp · -0% vs LL33
PH13 (Perth and Kinross)
~886 kWh/kWp · -0% vs LL33