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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in LL15 (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
13.4 years
After this, it's pure profit
Upfront Cost
£12,207
What you pay to get started
Annual Benefit
£908
What you save every year
Profit Over 25 Years
£10,489
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 885 kWh/kW — 44 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 885 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)
885 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 1771 kWh 708 kWh 1063 kWh £196 £106 £303 £4,069 13.4 yrs £1,983
3 kW 2656 kWh 1063 kWh 1594 kWh £295 £159 £454 £6,104 13.4 yrs £2,975
4 kW 3542 kWh 1417 kWh 2125 kWh £393 £213 £605 £8,138 13.4 yrs £3,967
5 kW 4427 kWh 1771 kWh 2656 kWh £491 £266 £757 £10,173 13.4 yrs £4,958
6 kW 5313 kWh 2125 kWh 3188 kWh £589 £319 £908 £12,207 13.4 yrs £5,950
7 kW 6198 kWh 2479 kWh 3719 kWh £687 £372 £1,059 £14,242 13.4 yrs £6,941
8 kW 7084 kWh 2833 kWh 4250 kWh £785 £425 £1,210 £16,276 13.4 yrs £7,933

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: £913, 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 1771 kWh 1063 kWh 708 kWh £295 £71 £365 £6,169 16.9 yrs £1,139
3 kW 2656 kWh 1594 kWh 1063 kWh £442 £106 £548 £8,204 15.0 yrs £2,758
4 kW 3542 kWh 2125 kWh 1417 kWh £589 £142 £731 £10,238 14.0 yrs £4,377
5 kW 4427 kWh 2656 kWh 1771 kWh £736 £177 £913 £12,273 13.4 yrs £5,996
6 kW 5313 kWh 3188 kWh 2125 kWh £884 £213 £1,096 £14,307 13.1 yrs £7,616
7 kW 6198 kWh 3719 kWh 2479 kWh £1,031 £248 £1,279 £16,342 12.8 yrs £9,235
8 kW 7084 kWh 4250 kWh 2833 kWh £1,178 £283 £1,462 £18,376 12.6 yrs £10,854

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: £992, 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 1771 kWh 1240 kWh 531 kWh £344 £53 £397 £7,569 19.1 yrs £366
3 kW 2656 kWh 1859 kWh 797 kWh £515 £80 £595 £9,604 16.1 yrs £2,299
4 kW 3542 kWh 2479 kWh 1063 kWh £687 £106 £794 £11,638 14.7 yrs £4,232
5 kW 4427 kWh 3099 kWh 1328 kWh £859 £133 £992 £13,673 13.8 yrs £6,165
6 kW 5313 kWh 3719 kWh 1594 kWh £1,031 £159 £1,190 £15,707 13.2 yrs £8,098
7 kW 6198 kWh 4339 kWh 1859 kWh £1,203 £186 £1,389 £17,742 12.8 yrs £10,031
8 kW 7084 kWh 4959 kWh 2125 kWh £1,375 £213 £1,587 £19,776 12.5 yrs £11,964

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: £1,015, 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 1771 kWh 1293 kWh 478 kWh £358 £48 £406 £9,319 22.9 yrs £-1,196
3 kW 2656 kWh 1939 kWh 717 kWh £538 £72 £609 £11,354 18.6 yrs £832
4 kW 3542 kWh 2586 kWh 956 kWh £717 £96 £812 £13,388 16.5 yrs £2,859
5 kW 4427 kWh 3232 kWh 1195 kWh £896 £120 £1,015 £15,423 15.2 yrs £4,886
6 kW 5313 kWh 3878 kWh 1434 kWh £1,075 £143 £1,219 £17,457 14.3 yrs £6,913
7 kW 6198 kWh 4525 kWh 1674 kWh £1,254 £167 £1,422 £19,492 13.7 yrs £8,940
8 kW 7084 kWh 5171 kWh 1913 kWh £1,433 £191 £1,625 £21,526 13.2 yrs £10,968

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: £1,031, Upfront: £17,173, Break-even: 16.7 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1771 kWh 1328 kWh 443 kWh £368 £44 £412 £11,069 26.8 yrs £-2,820
3 kW 2656 kWh 1992 kWh 664 kWh £552 £66 £619 £13,104 21.2 yrs £-730
4 kW 3542 kWh 2656 kWh 885 kWh £736 £89 £825 £15,138 18.4 yrs £1,360
5 kW 4427 kWh 3320 kWh 1107 kWh £920 £111 £1,031 £17,173 16.7 yrs £3,450
6 kW 5313 kWh 3985 kWh 1328 kWh £1,105 £133 £1,237 £19,207 15.5 yrs £5,540
7 kW 6198 kWh 4649 kWh 1550 kWh £1,289 £155 £1,444 £21,242 14.7 yrs £7,630
8 kW 7084 kWh 5313 kWh 1771 kWh £1,473 £177 £1,650 £23,276 14.1 yrs £9,720

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: £1,047, 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 1771 kWh 1364 kWh 407 kWh £378 £41 £419 £13,519 32.3 yrs £-5,145
3 kW 2656 kWh 2045 kWh 611 kWh £567 £61 £628 £15,554 24.8 yrs £-2,992
4 kW 3542 kWh 2727 kWh 815 kWh £756 £81 £837 £17,588 21.0 yrs £-839
5 kW 4427 kWh 3409 kWh 1018 kWh £945 £102 £1,047 £19,623 18.7 yrs £1,314
6 kW 5313 kWh 4091 kWh 1222 kWh £1,134 £122 £1,256 £21,657 17.2 yrs £3,466
7 kW 6198 kWh 4773 kWh 1426 kWh £1,323 £143 £1,466 £23,692 16.2 yrs £5,619
8 kW 7084 kWh 5454 kWh 1629 kWh £1,512 £163 £1,675 £25,726 15.4 yrs £7,772

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 LL15

Figures below are tailored to LL15 — click through for full league tables.

Big-Roof Britain Rank #360 of 2182
5.8 kWp (UK avg 5.1 kWp)
~12 panels (≈430 W)
Solar Payback Index Rank #1864 of 2997
11.6 years (UK avg 11.3 years)
~£1,049 /yr • £12,207 upfront
Standing-Charge Drag Rank #2147 of 2997
24.3% (UK avg 21.7%) drag on savings
£255 fixed • ~£1,049 /yr value

Your Area at a Glance

Your Electricity Rate
27.72p/kWh
Daily Fixed Charge
69.95p/day
Local Sunshine
885kWh/kW
A 1 kW system generates ~885 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: 66% • Flats: 13% • Bungalows: 20% Based on 3,189 properties

Coverage

Denbighshire (100%)

Areas Covered

Ruthin, Llanfair Dyffryn Clwyd Gwyddelwern, Moel Famau, Efenechdyd, Llandyrnog, Llanrhaeadr-yng-Nghinmeirch

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

LL16 (Denbighshire)
≈10.6 km away
Local sunshine: ~924 kWh/kWp · +4% vs LL15
CH7 (Flintshire)
≈13.1 km away
Local sunshine: ~940 kWh/kWp · +6% vs LL15
LL21 (Denbighshire)
≈15.5 km away
Local sunshine: ~785 kWh/kWp · -11% vs LL15
LL17 (Denbighshire)
≈18.0 km away
Local sunshine: ~924 kWh/kWp · +4% vs LL15
CH6 (Flintshire)
≈18.5 km away
Local sunshine: ~946 kWh/kWp · +7% vs LL15
LL20 (Denbighshire)
≈18.7 km away
Local sunshine: ~877 kWh/kWp · -1% vs LL15

Similar sunshine across the UK

BT3 (Belfast)
~885 kWh/kWp · +0% vs LL15
CA2 (Cumberland)
~885 kWh/kWp · -0% vs LL15
BT99 (Belfast)
~885 kWh/kWp · -0% vs LL15