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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in LL20 (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
13.6 years
After this, it's pure profit
Upfront Cost
£10,173
What you pay to get started
Annual Benefit
£750
What you save every year
Profit Over 25 Years
£8,571
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 877 kWh/kW — 52 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 877 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)
877 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: £750, Upfront: £10,173, 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 1755 kWh 702 kWh 1053 kWh £195 £105 £300 £4,069 13.6 yrs £1,929
3 kW 2632 kWh 1053 kWh 1579 kWh £292 £158 £450 £6,104 13.6 yrs £2,893
4 kW 3510 kWh 1404 kWh 2106 kWh £389 £211 £600 £8,138 13.6 yrs £3,858
5 kW 4387 kWh 1755 kWh 2632 kWh £486 £263 £750 £10,173 13.6 yrs £4,822
6 kW 5265 kWh 2106 kWh 3159 kWh £584 £316 £900 £12,207 13.6 yrs £5,786
7 kW 6142 kWh 2457 kWh 3685 kWh £681 £369 £1,050 £14,242 13.6 yrs £6,751
8 kW 7020 kWh 2808 kWh 4212 kWh £778 £421 £1,200 £16,276 13.6 yrs £7,715

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: £905, Upfront: £12,273, 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 1755 kWh 1053 kWh 702 kWh £292 £70 £362 £6,169 17.0 yrs £1,073
3 kW 2632 kWh 1579 kWh 1053 kWh £438 £105 £543 £8,204 15.1 yrs £2,659
4 kW 3510 kWh 2106 kWh 1404 kWh £584 £140 £724 £10,238 14.1 yrs £4,245
5 kW 4387 kWh 2632 kWh 1755 kWh £730 £175 £905 £12,273 13.6 yrs £5,832
6 kW 5265 kWh 3159 kWh 2106 kWh £876 £211 £1,086 £14,307 13.2 yrs £7,418
7 kW 6142 kWh 3685 kWh 2457 kWh £1,022 £246 £1,267 £16,342 12.9 yrs £9,005
8 kW 7020 kWh 4212 kWh 2808 kWh £1,168 £281 £1,448 £18,376 12.7 yrs £10,591

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: £983, Upfront: £13,673, Break-even: 13.9 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1755 kWh 1228 kWh 526 kWh £341 £53 £393 £7,569 19.3 yrs £295
3 kW 2632 kWh 1843 kWh 790 kWh £511 £79 £590 £9,604 16.3 yrs £2,192
4 kW 3510 kWh 2457 kWh 1053 kWh £681 £105 £786 £11,638 14.8 yrs £4,089
5 kW 4387 kWh 3071 kWh 1316 kWh £851 £132 £983 £13,673 13.9 yrs £5,987
6 kW 5265 kWh 3685 kWh 1579 kWh £1,022 £158 £1,180 £15,707 13.3 yrs £7,884
7 kW 6142 kWh 4300 kWh 1843 kWh £1,192 £184 £1,376 £17,742 12.9 yrs £9,781
8 kW 7020 kWh 4914 kWh 2106 kWh £1,362 £211 £1,573 £19,776 12.6 yrs £11,679

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: £1,006, Upfront: £15,423, 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 1755 kWh 1281 kWh 474 kWh £355 £47 £403 £9,319 23.2 yrs £-1,269
3 kW 2632 kWh 1922 kWh 711 kWh £533 £71 £604 £11,354 18.8 yrs £722
4 kW 3510 kWh 2562 kWh 948 kWh £710 £95 £805 £13,388 16.6 yrs £2,713
5 kW 4387 kWh 3203 kWh 1185 kWh £888 £118 £1,006 £15,423 15.3 yrs £4,703
6 kW 5265 kWh 3843 kWh 1422 kWh £1,065 £142 £1,208 £17,457 14.5 yrs £6,694
7 kW 6142 kWh 4484 kWh 1658 kWh £1,243 £166 £1,409 £19,492 13.8 yrs £8,684
8 kW 7020 kWh 5125 kWh 1895 kWh £1,421 £190 £1,610 £21,526 13.4 yrs £10,675

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: £1,022, Upfront: £17,173, Break-even: 16.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1755 kWh 1316 kWh 439 kWh £365 £44 £409 £11,069 27.1 yrs £-2,894
3 kW 2632 kWh 1974 kWh 658 kWh £547 £66 £613 £13,104 21.4 yrs £-841
4 kW 3510 kWh 2632 kWh 877 kWh £730 £88 £817 £15,138 18.5 yrs £1,211
5 kW 4387 kWh 3291 kWh 1097 kWh £912 £110 £1,022 £17,173 16.8 yrs £3,264
6 kW 5265 kWh 3949 kWh 1316 kWh £1,095 £132 £1,226 £19,207 15.7 yrs £5,317
7 kW 6142 kWh 4607 kWh 1536 kWh £1,277 £154 £1,431 £21,242 14.8 yrs £7,370
8 kW 7020 kWh 5265 kWh 1755 kWh £1,459 £175 £1,635 £23,276 14.2 yrs £9,423

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: £1,037, Upfront: £19,623, Break-even: 18.9 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1755 kWh 1351 kWh 404 kWh £375 £40 £415 £13,519 32.6 yrs £-5,220
3 kW 2632 kWh 2027 kWh 605 kWh £562 £61 £622 £15,554 25.0 yrs £-3,105
4 kW 3510 kWh 2703 kWh 807 kWh £749 £81 £830 £17,588 21.2 yrs £-990
5 kW 4387 kWh 3378 kWh 1009 kWh £936 £101 £1,037 £19,623 18.9 yrs £1,125
6 kW 5265 kWh 4054 kWh 1211 kWh £1,124 £121 £1,245 £21,657 17.4 yrs £3,240
7 kW 6142 kWh 4730 kWh 1413 kWh £1,311 £141 £1,452 £23,692 16.3 yrs £5,355
8 kW 7020 kWh 5405 kWh 1615 kWh £1,498 £161 £1,660 £25,726 15.5 yrs £7,470

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 LL20

Figures below are tailored to LL20 — click through for full league tables.

Big-Roof Britain Rank #638 of 2182
5.4 kWp (UK avg 5.1 kWp)
~11 panels (≈430 W)
Solar Payback Index Rank #1994 of 2997
11.7 years (UK avg 11.3 years)
~£866 /yr • £10,173 upfront
Standing-Charge Drag Rank #2624 of 2997
29.5% (UK avg 21.7%) drag on savings
£255 fixed • ~£866 /yr value

Your Area at a Glance

Your Electricity Rate
27.72p/kWh
Daily Fixed Charge
69.95p/day
Local Sunshine
877kWh/kW
A 1 kW system generates ~877 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: 73% • Flats: 12% • Bungalows: 13% Based on 2,267 properties

Coverage

Denbighshire (61%)|Wrexham (39%)

Areas Covered

Llangollen, Dyffryn Ceiriog, Llangollen Rural, Alyn Valley, Cefn West, Chirk South

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

LL14 (Wrexham)
≈8.4 km away
Local sunshine: ~935 kWh/kWp · +7% vs LL20
LL11 (Wrexham)
≈14.2 km away
Local sunshine: ~939 kWh/kWp · +7% vs LL20
LL21 (Denbighshire)
≈14.5 km away
Local sunshine: ~785 kWh/kWp · -11% vs LL20
SY11 (Shropshire)
≈14.8 km away
Local sunshine: ~944 kWh/kWp · +8% vs LL20
LL13 (Wrexham)
≈15.5 km away
Local sunshine: ~937 kWh/kWp · +7% vs LL20
SY10 (Shropshire)
≈15.8 km away
Local sunshine: ~929 kWh/kWp · +6% vs LL20

Similar sunshine across the UK

KA23 (North Ayrshire)
~878 kWh/kWp · +0% vs LL20
EH1 (City of Edinburgh)
~878 kWh/kWp · +0% vs LL20
CA11 (Westmorland and Furness)
~877 kWh/kWp · -0% vs LL20