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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in LL12 (Wrexham)

See if solar pays off for you in Wrexham — 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
12.7 years
After this, it's pure profit
Upfront Cost
£10,173
What you pay to get started
Annual Benefit
£803
What you save every year
Profit Over 25 Years
£9,895
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 939 kWh/kW — 10 above 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 939 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)
939 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: £803, Upfront: £10,173, Break-even: 12.7 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1879 kWh 752 kWh 1127 kWh £208 £113 £321 £4,069 12.7 yrs £2,352
3 kW 2818 kWh 1127 kWh 1691 kWh £313 £169 £482 £6,104 12.7 yrs £3,529
4 kW 3758 kWh 1503 kWh 2255 kWh £417 £225 £642 £8,138 12.7 yrs £4,705
5 kW 4697 kWh 1879 kWh 2818 kWh £521 £282 £803 £10,173 12.7 yrs £5,881
6 kW 5637 kWh 2255 kWh 3382 kWh £625 £338 £963 £12,207 12.7 yrs £7,057
7 kW 6576 kWh 2631 kWh 3946 kWh £729 £395 £1,124 £14,242 12.7 yrs £8,234
8 kW 7516 kWh 3006 kWh 4509 kWh £833 £451 £1,284 £16,276 12.7 yrs £9,410

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: £969, Upfront: £12,273, Break-even: 12.7 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1879 kWh 1127 kWh 752 kWh £313 £75 £388 £6,169 15.9 yrs £1,584
3 kW 2818 kWh 1691 kWh 1127 kWh £469 £113 £581 £8,204 14.1 yrs £3,426
4 kW 3758 kWh 2255 kWh 1503 kWh £625 £150 £775 £10,238 13.2 yrs £5,268
5 kW 4697 kWh 2818 kWh 1879 kWh £781 £188 £969 £12,273 12.7 yrs £7,111
6 kW 5637 kWh 3382 kWh 2255 kWh £938 £225 £1,163 £14,307 12.3 yrs £8,953
7 kW 6576 kWh 3946 kWh 2631 kWh £1,094 £263 £1,357 £16,342 12.0 yrs £10,795
8 kW 7516 kWh 4509 kWh 3006 kWh £1,250 £301 £1,551 £18,376 11.9 yrs £12,637

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: £1,052, Upfront: £13,673, Break-even: 13.0 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1879 kWh 1315 kWh 564 kWh £365 £56 £421 £7,569 18.0 yrs £850
3 kW 2818 kWh 1973 kWh 846 kWh £547 £85 £631 £9,604 15.2 yrs £3,025
4 kW 3758 kWh 2631 kWh 1127 kWh £729 £113 £842 £11,638 13.8 yrs £5,200
5 kW 4697 kWh 3288 kWh 1409 kWh £911 £141 £1,052 £13,673 13.0 yrs £7,375
6 kW 5637 kWh 3946 kWh 1691 kWh £1,094 £169 £1,263 £15,707 12.4 yrs £9,550
7 kW 6576 kWh 4603 kWh 1973 kWh £1,276 £197 £1,473 £17,742 12.0 yrs £11,725
8 kW 7516 kWh 5261 kWh 2255 kWh £1,458 £225 £1,684 £19,776 11.7 yrs £13,901

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: £1,077, Upfront: £15,423, Break-even: 14.3 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1879 kWh 1372 kWh 507 kWh £380 £51 £431 £9,319 21.6 yrs £-700
3 kW 2818 kWh 2057 kWh 761 kWh £570 £76 £646 £11,354 17.6 yrs £1,575
4 kW 3758 kWh 2743 kWh 1015 kWh £760 £101 £862 £13,388 15.5 yrs £3,850
5 kW 4697 kWh 3429 kWh 1268 kWh £951 £127 £1,077 £15,423 14.3 yrs £6,125
6 kW 5637 kWh 4115 kWh 1522 kWh £1,141 £152 £1,293 £17,457 13.5 yrs £8,400
7 kW 6576 kWh 4801 kWh 1776 kWh £1,331 £178 £1,508 £19,492 12.9 yrs £10,675
8 kW 7516 kWh 5487 kWh 2029 kWh £1,521 £203 £1,724 £21,526 12.5 yrs £12,950

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: £1,094, Upfront: £17,173, Break-even: 15.7 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1879 kWh 1409 kWh 470 kWh £391 £47 £438 £11,069 25.3 yrs £-2,317
3 kW 2818 kWh 2114 kWh 705 kWh £586 £70 £656 £13,104 20.0 yrs £25
4 kW 3758 kWh 2818 kWh 939 kWh £781 £94 £875 £15,138 17.3 yrs £2,366
5 kW 4697 kWh 3523 kWh 1174 kWh £977 £117 £1,094 £17,173 15.7 yrs £4,708
6 kW 5637 kWh 4228 kWh 1409 kWh £1,172 £141 £1,313 £19,207 14.6 yrs £7,049
7 kW 6576 kWh 4932 kWh 1644 kWh £1,367 £164 £1,532 £21,242 13.9 yrs £9,391
8 kW 7516 kWh 5637 kWh 1879 kWh £1,563 £188 £1,750 £23,276 13.3 yrs £11,732

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: £1,111, Upfront: £19,623, Break-even: 17.7 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1879 kWh 1447 kWh 432 kWh £401 £43 £444 £13,519 30.4 yrs £-4,634
3 kW 2818 kWh 2170 kWh 648 kWh £602 £65 £666 £15,554 23.3 yrs £-2,226
4 kW 3758 kWh 2894 kWh 864 kWh £802 £86 £889 £17,588 19.8 yrs £183
5 kW 4697 kWh 3617 kWh 1080 kWh £1,003 £108 £1,111 £19,623 17.7 yrs £2,591
6 kW 5637 kWh 4340 kWh 1296 kWh £1,203 £130 £1,333 £21,657 16.2 yrs £4,999
7 kW 6576 kWh 5064 kWh 1513 kWh £1,404 £151 £1,555 £23,692 15.2 yrs £7,407
8 kW 7516 kWh 5787 kWh 1729 kWh £1,604 £173 £1,777 £25,726 14.5 yrs £9,815

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 LL12

Figures below are tailored to LL12 — click through for full league tables.

Big-Roof Britain Rank #711 of 2182
5.3 kWp (UK avg 5.1 kWp)
~11 panels (≈430 W)
Solar Payback Index Rank #1227 of 2997
11.0 years (UK avg 11.3 years)
~£928 /yr • £10,173 upfront
Standing-Charge Drag Rank #2459 of 2997
27.5% (UK avg 21.7%) drag on savings
£255 fixed • ~£928 /yr value

Your Area at a Glance

Your Electricity Rate
27.72p/kWh
Daily Fixed Charge
69.95p/day
Local Sunshine
939kWh/kW
A 1 kW system generates ~939 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: 75% • Flats: 8% • Bungalows: 16% Based on 6,214 properties

Coverage

Wrexham (81%)|Flintshire (19%)

Areas Covered

Llay, Acton and Maesydre, Rossett, Gresford East and West, Hope, Marford and Hoseley, Caergwrle, Little Acton + 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

LL11 (Wrexham)
≈4.1 km away
Local sunshine: ~939 kWh/kWp · -0% vs LL12
LL13 (Wrexham)
≈5.3 km away
Local sunshine: ~937 kWh/kWp · -0% vs LL12
CH88 (Cheshire West and Chester)
≈9.6 km away
Local sunshine: ~930 kWh/kWp · -1% vs LL12
CH4 (Cheshire West and Chester)
≈10.1 km away
Local sunshine: ~942 kWh/kWp · +0% vs LL12
LL14 (Wrexham)
≈11.2 km away
Local sunshine: ~935 kWh/kWp · -1% vs LL12
CH70 (Cheshire West and Chester)
≈12.2 km away
Local sunshine: ~931 kWh/kWp · -1% vs LL12

Similar sunshine across the UK

B9 (Birmingham)
~939 kWh/kWp · -0% vs LL12
B4 (Birmingham)
~940 kWh/kWp · +0% vs LL12
B8 (Birmingham)
~939 kWh/kWp · -0% vs LL12