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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in LL28 (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
13.2 years
After this, it's pure profit
Upfront Cost
£12,207
What you pay to get started
Annual Benefit
£923
What you save every year
Profit Over 25 Years
£10,874
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 900 kWh/kW — 29 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 900 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)
900 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: £769, Upfront: £10,173, Break-even: 13.2 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1801 kWh 720 kWh 1081 kWh £200 £108 £308 £4,069 13.2 yrs £2,086
3 kW 2701 kWh 1081 kWh 1621 kWh £300 £162 £462 £6,104 13.2 yrs £3,129
4 kW 3602 kWh 1441 kWh 2161 kWh £399 £216 £615 £8,138 13.2 yrs £4,172
5 kW 4502 kWh 1801 kWh 2701 kWh £499 £270 £769 £10,173 13.2 yrs £5,215
6 kW 5403 kWh 2161 kWh 3242 kWh £599 £324 £923 £12,207 13.2 yrs £6,258
7 kW 6303 kWh 2521 kWh 3782 kWh £699 £378 £1,077 £14,242 13.2 yrs £7,301
8 kW 7204 kWh 2882 kWh 4322 kWh £799 £432 £1,231 £16,276 13.2 yrs £8,343

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: £929, Upfront: £12,273, Break-even: 13.2 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1801 kWh 1081 kWh 720 kWh £300 £72 £372 £6,169 16.6 yrs £1,262
3 kW 2701 kWh 1621 kWh 1081 kWh £449 £108 £557 £8,204 14.7 yrs £2,944
4 kW 3602 kWh 2161 kWh 1441 kWh £599 £144 £743 £10,238 13.8 yrs £4,625
5 kW 4502 kWh 2701 kWh 1801 kWh £749 £180 £929 £12,273 13.2 yrs £6,306
6 kW 5403 kWh 3242 kWh 2161 kWh £899 £216 £1,115 £14,307 12.8 yrs £7,987
7 kW 6303 kWh 3782 kWh 2521 kWh £1,048 £252 £1,300 £16,342 12.6 yrs £9,668
8 kW 7204 kWh 4322 kWh 2882 kWh £1,198 £288 £1,486 £18,376 12.4 yrs £11,350

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: £1,009, Upfront: £13,673, Break-even: 13.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1801 kWh 1261 kWh 540 kWh £349 £54 £403 £7,569 18.8 yrs £501
3 kW 2701 kWh 1891 kWh 810 kWh £524 £81 £605 £9,604 15.9 yrs £2,501
4 kW 3602 kWh 2521 kWh 1081 kWh £699 £108 £807 £11,638 14.4 yrs £4,501
5 kW 4502 kWh 3152 kWh 1351 kWh £874 £135 £1,009 £13,673 13.6 yrs £6,502
6 kW 5403 kWh 3782 kWh 1621 kWh £1,048 £162 £1,210 £15,707 13.0 yrs £8,502
7 kW 6303 kWh 4412 kWh 1891 kWh £1,223 £189 £1,412 £17,742 12.6 yrs £10,502
8 kW 7204 kWh 5043 kWh 2161 kWh £1,398 £216 £1,614 £19,776 12.3 yrs £12,503

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: £1,033, Upfront: £15,423, Break-even: 14.9 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1801 kWh 1315 kWh 486 kWh £364 £49 £413 £9,319 22.6 yrs £-1,058
3 kW 2701 kWh 1972 kWh 729 kWh £547 £73 £620 £11,354 18.3 yrs £1,038
4 kW 3602 kWh 2629 kWh 973 kWh £729 £97 £826 £13,388 16.2 yrs £3,134
5 kW 4502 kWh 3287 kWh 1216 kWh £911 £122 £1,033 £15,423 14.9 yrs £5,230
6 kW 5403 kWh 3944 kWh 1459 kWh £1,093 £146 £1,239 £17,457 14.1 yrs £7,326
7 kW 6303 kWh 4601 kWh 1702 kWh £1,276 £170 £1,446 £19,492 13.5 yrs £9,422
8 kW 7204 kWh 5259 kWh 1945 kWh £1,458 £195 £1,652 £21,526 13.0 yrs £11,518

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: £1,049, Upfront: £17,173, Break-even: 16.4 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1801 kWh 1351 kWh 450 kWh £374 £45 £419 £11,069 26.4 yrs £-2,680
3 kW 2701 kWh 2026 kWh 675 kWh £562 £68 £629 £13,104 20.8 yrs £-520
4 kW 3602 kWh 2701 kWh 900 kWh £749 £90 £839 £15,138 18.0 yrs £1,640
5 kW 4502 kWh 3377 kWh 1126 kWh £936 £113 £1,049 £17,173 16.4 yrs £3,799
6 kW 5403 kWh 4052 kWh 1351 kWh £1,123 £135 £1,258 £19,207 15.3 yrs £5,959
7 kW 6303 kWh 4727 kWh 1576 kWh £1,310 £158 £1,468 £21,242 14.5 yrs £8,119
8 kW 7204 kWh 5403 kWh 1801 kWh £1,498 £180 £1,678 £23,276 13.9 yrs £10,279

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: £1,065, Upfront: £19,623, Break-even: 18.4 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1801 kWh 1387 kWh 414 kWh £384 £41 £426 £13,519 31.7 yrs £-5,003
3 kW 2701 kWh 2080 kWh 621 kWh £577 £62 £639 £15,554 24.4 yrs £-2,779
4 kW 3602 kWh 2773 kWh 828 kWh £769 £83 £852 £17,588 20.7 yrs £-555
5 kW 4502 kWh 3467 kWh 1036 kWh £961 £104 £1,065 £19,623 18.4 yrs £1,669
6 kW 5403 kWh 4160 kWh 1243 kWh £1,153 £124 £1,277 £21,657 17.0 yrs £3,892
7 kW 6303 kWh 4854 kWh 1450 kWh £1,345 £145 £1,490 £23,692 15.9 yrs £6,116
8 kW 7204 kWh 5547 kWh 1657 kWh £1,538 £166 £1,703 £25,726 15.1 yrs £8,340

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 LL28

Figures below are tailored to LL28 — click through for full league tables.

Big-Roof Britain Rank #407 of 2182
5.7 kWp (UK avg 5.1 kWp)
~12 panels (≈430 W)
Solar Payback Index Rank #1702 of 2997
11.4 years (UK avg 11.3 years)
~£1,067 /yr • £12,207 upfront
Standing-Charge Drag Rank #2130 of 2997
23.9% (UK avg 21.7%) drag on savings
£255 fixed • ~£1,067 /yr value

Your Area at a Glance

Your Electricity Rate
27.72p/kWh
Daily Fixed Charge
69.95p/day
Local Sunshine
900kWh/kW
A 1 kW system generates ~900 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: 50% • Flats: 30% • Bungalows: 18% Based on 4,052 properties

Coverage

Conwy (100%)

Areas Covered

Llandrillo-yn-Rhos, Llansanffraid, Mochdre, Rhiw, Eglwys-bach a Llangernyw, Betws-yn-Rhos, Caerhun

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

LL29 (Conwy)
≈2.0 km away
Local sunshine: ~923 kWh/kWp · +3% vs LL28
LL31 (Conwy)
≈4.0 km away
Local sunshine: ~908 kWh/kWp · +1% vs LL28
LL30 (Conwy)
≈5.3 km away
Local sunshine: ~919 kWh/kWp · +2% vs LL28
LL32 (Conwy)
≈6.3 km away
Local sunshine: ~906 kWh/kWp · +1% vs LL28
LL22 (Conwy)
≈11.2 km away
Local sunshine: ~949 kWh/kWp · +5% vs LL28
LL34 (Conwy)
≈11.5 km away
Local sunshine: ~871 kWh/kWp · -3% vs LL28

Similar sunshine across the UK

KY9 (Fife)
~901 kWh/kWp · +0% vs LL28
DE4 (Derbyshire Dales)
~900 kWh/kWp · -0% vs LL28
ST6 (Stoke-on-Trent)
~900 kWh/kWp · -0% vs LL28