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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in LL18 (Denbighshire)

See if solar pays off for you in Denbighshire — 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
12.8 years
After this, it's pure profit
Upfront Cost
£12,207
What you pay to get started
Annual Benefit
£956
What you save every year
Profit Over 25 Years
£11,704
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 933 kWh/kW — 3 above 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 933 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)
933 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: £797, Upfront: £10,173, Break-even: 12.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1866 kWh 746 kWh 1119 kWh £207 £112 £319 £4,069 12.8 yrs £2,307
3 kW 2799 kWh 1119 kWh 1679 kWh £310 £168 £478 £6,104 12.8 yrs £3,461
4 kW 3731 kWh 1493 kWh 2239 kWh £414 £224 £638 £8,138 12.8 yrs £4,615
5 kW 4664 kWh 1866 kWh 2799 kWh £517 £280 £797 £10,173 12.8 yrs £5,768
6 kW 5597 kWh 2239 kWh 3358 kWh £621 £336 £956 £12,207 12.8 yrs £6,922
7 kW 6530 kWh 2612 kWh 3918 kWh £724 £392 £1,116 £14,242 12.8 yrs £8,075
8 kW 7463 kWh 2985 kWh 4478 kWh £827 £448 £1,275 £16,276 12.8 yrs £9,229

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: £962, Upfront: £12,273, Break-even: 12.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1866 kWh 1119 kWh 746 kWh £310 £75 £385 £6,169 16.0 yrs £1,530
3 kW 2799 kWh 1679 kWh 1119 kWh £465 £112 £577 £8,204 14.2 yrs £3,345
4 kW 3731 kWh 2239 kWh 1493 kWh £621 £149 £770 £10,238 13.3 yrs £5,159
5 kW 4664 kWh 2799 kWh 1866 kWh £776 £187 £962 £12,273 12.8 yrs £6,974
6 kW 5597 kWh 3358 kWh 2239 kWh £931 £224 £1,155 £14,307 12.4 yrs £8,789
7 kW 6530 kWh 3918 kWh 2612 kWh £1,086 £261 £1,347 £16,342 12.1 yrs £10,604
8 kW 7463 kWh 4478 kWh 2985 kWh £1,241 £299 £1,540 £18,376 11.9 yrs £12,419

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: £1,045, Upfront: £13,673, 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 1866 kWh 1306 kWh 560 kWh £362 £56 £418 £7,569 18.1 yrs £791
3 kW 2799 kWh 1959 kWh 840 kWh £543 £84 £627 £9,604 15.3 yrs £2,936
4 kW 3731 kWh 2612 kWh 1119 kWh £724 £112 £836 £11,638 13.9 yrs £5,082
5 kW 4664 kWh 3265 kWh 1399 kWh £905 £140 £1,045 £13,673 13.1 yrs £7,227
6 kW 5597 kWh 3918 kWh 1679 kWh £1,086 £168 £1,254 £15,707 12.5 yrs £9,373
7 kW 6530 kWh 4571 kWh 1959 kWh £1,267 £196 £1,463 £17,742 12.1 yrs £11,518
8 kW 7463 kWh 5224 kWh 2239 kWh £1,448 £224 £1,672 £19,776 11.8 yrs £13,664

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: £1,070, Upfront: £15,423, Break-even: 14.4 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1866 kWh 1362 kWh 504 kWh £378 £50 £428 £9,319 21.8 yrs £-761
3 kW 2799 kWh 2043 kWh 756 kWh £566 £76 £642 £11,354 17.7 yrs £1,484
4 kW 3731 kWh 2724 kWh 1007 kWh £755 £101 £856 £13,388 15.6 yrs £3,729
5 kW 4664 kWh 3405 kWh 1259 kWh £944 £126 £1,070 £15,423 14.4 yrs £5,973
6 kW 5597 kWh 4086 kWh 1511 kWh £1,133 £151 £1,284 £17,457 13.6 yrs £8,218
7 kW 6530 kWh 4767 kWh 1763 kWh £1,321 £176 £1,498 £19,492 13.0 yrs £10,462
8 kW 7463 kWh 5448 kWh 2015 kWh £1,510 £201 £1,712 £21,526 12.6 yrs £12,707

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: £1,086, Upfront: £17,173, Break-even: 15.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1866 kWh 1399 kWh 466 kWh £388 £47 £435 £11,069 25.5 yrs £-2,378
3 kW 2799 kWh 2099 kWh 700 kWh £582 £70 £652 £13,104 20.1 yrs £-68
4 kW 3731 kWh 2799 kWh 933 kWh £776 £93 £869 £15,138 17.4 yrs £2,243
5 kW 4664 kWh 3498 kWh 1166 kWh £970 £117 £1,086 £17,173 15.8 yrs £4,554
6 kW 5597 kWh 4198 kWh 1399 kWh £1,164 £140 £1,304 £19,207 14.7 yrs £6,865
7 kW 6530 kWh 4898 kWh 1633 kWh £1,358 £163 £1,521 £21,242 14.0 yrs £9,175
8 kW 7463 kWh 5597 kWh 1866 kWh £1,552 £187 £1,738 £23,276 13.4 yrs £11,486

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: £1,103, Upfront: £19,623, Break-even: 17.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1866 kWh 1437 kWh 429 kWh £398 £43 £441 £13,519 30.6 yrs £-4,696
3 kW 2799 kWh 2155 kWh 644 kWh £597 £64 £662 £15,554 23.5 yrs £-2,319
4 kW 3731 kWh 2873 kWh 858 kWh £796 £86 £882 £17,588 19.9 yrs £57
5 kW 4664 kWh 3592 kWh 1073 kWh £996 £107 £1,103 £19,623 17.8 yrs £2,434
6 kW 5597 kWh 4310 kWh 1287 kWh £1,195 £129 £1,323 £21,657 16.4 yrs £4,811
7 kW 6530 kWh 5028 kWh 1502 kWh £1,394 £150 £1,544 £23,692 15.3 yrs £7,188
8 kW 7463 kWh 5746 kWh 1716 kWh £1,593 £172 £1,765 £25,726 14.6 yrs £9,565

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 LL18

Figures below are tailored to LL18 — click through for full league tables.

Big-Roof Britain Rank #856 of 2182
5.2 kWp (UK avg 5.1 kWp)
~11 panels (≈430 W)
Solar Payback Index Rank #1230 of 2997
11.0 years (UK avg 11.3 years)
~£1,105 /yr • £12,207 upfront
Standing-Charge Drag Rank #2083 of 2997
23.1% (UK avg 21.7%) drag on savings
£255 fixed • ~£1,105 /yr value

Your Area at a Glance

Your Electricity Rate
27.72p/kWh
Daily Fixed Charge
69.95p/day
Local Sunshine
933kWh/kW
A 1 kW system generates ~933 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: 47% • Flats: 24% • Bungalows: 27% Based on 13,658 properties

Coverage

Denbighshire (88%)|Conwy (10%)|Flintshire (3%)

Areas Covered

Rhyl South West, Rhyl West, Rhyl East, Kinmel Bay, Rhuddlan, Rhyl South, Rhyl Tŷ Newydd, Rhyl Trellewelyn + 4 more

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

LL19 (Denbighshire)
≈5.3 km away
Local sunshine: ~918 kWh/kWp · -2% vs LL18
LL17 (Denbighshire)
≈7.3 km away
Local sunshine: ~924 kWh/kWp · -1% vs LL18
LL22 (Conwy)
≈7.5 km away
Local sunshine: ~949 kWh/kWp · +2% vs LL18
LL16 (Denbighshire)
≈15.4 km away
Local sunshine: ~924 kWh/kWp · -1% vs LL18
LL29 (Conwy)
≈16.2 km away
Local sunshine: ~923 kWh/kWp · -1% vs LL18
CH8 (Flintshire)
≈17.7 km away
Local sunshine: ~925 kWh/kWp · -1% vs LL18

Similar sunshine across the UK

WS1 (Walsall)
~933 kWh/kWp · +0% vs LL18
SY5 (Shropshire)
~933 kWh/kWp · +0% vs LL18
NP13 (Blaenau Gwent)
~933 kWh/kWp · +0% vs LL18