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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in CH48 (Wirral)

See if solar pays off for you in Wirral — 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
12.5 years
After this, it's pure profit
Upfront Cost
£12,207
What you pay to get started
Annual Benefit
£977
What you save every year
Profit Over 25 Years
£12,224
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 953 kWh/kW — 23 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 953 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)
953 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: £814, Upfront: £10,173, Break-even: 12.5 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1906 kWh 763 kWh 1144 kWh £211 £114 £326 £4,069 12.5 yrs £2,446
3 kW 2859 kWh 1144 kWh 1716 kWh £317 £172 £489 £6,104 12.5 yrs £3,669
4 kW 3813 kWh 1525 kWh 2288 kWh £423 £229 £651 £8,138 12.5 yrs £4,892
5 kW 4766 kWh 1906 kWh 2859 kWh £528 £286 £814 £10,173 12.5 yrs £6,115
6 kW 5719 kWh 2288 kWh 3431 kWh £634 £343 £977 £12,207 12.5 yrs £7,337
7 kW 6672 kWh 2669 kWh 4003 kWh £740 £400 £1,140 £14,242 12.5 yrs £8,560
8 kW 7625 kWh 3050 kWh 4575 kWh £845 £458 £1,303 £16,276 12.5 yrs £9,783

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: £983, Upfront: £12,273, Break-even: 12.5 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1906 kWh 1144 kWh 763 kWh £317 £76 £393 £6,169 15.7 yrs £1,697
3 kW 2859 kWh 1716 kWh 1144 kWh £476 £114 £590 £8,204 13.9 yrs £3,595
4 kW 3813 kWh 2288 kWh 1525 kWh £634 £153 £787 £10,238 13.0 yrs £5,494
5 kW 4766 kWh 2859 kWh 1906 kWh £793 £191 £983 £12,273 12.5 yrs £7,392
6 kW 5719 kWh 3431 kWh 2288 kWh £951 £229 £1,180 £14,307 12.1 yrs £9,291
7 kW 6672 kWh 4003 kWh 2669 kWh £1,110 £267 £1,377 £16,342 11.9 yrs £11,189
8 kW 7625 kWh 4575 kWh 3050 kWh £1,268 £305 £1,573 £18,376 11.7 yrs £13,088

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: £1,068, Upfront: £13,673, 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 1906 kWh 1334 kWh 572 kWh £370 £57 £427 £7,569 17.7 yrs £973
3 kW 2859 kWh 2002 kWh 858 kWh £555 £86 £641 £9,604 15.0 yrs £3,209
4 kW 3813 kWh 2669 kWh 1144 kWh £740 £114 £854 £11,638 13.6 yrs £5,445
5 kW 4766 kWh 3336 kWh 1430 kWh £925 £143 £1,068 £13,673 12.8 yrs £7,681
6 kW 5719 kWh 4003 kWh 1716 kWh £1,110 £172 £1,281 £15,707 12.3 yrs £9,918
7 kW 6672 kWh 4670 kWh 2002 kWh £1,295 £200 £1,495 £17,742 11.9 yrs £12,154
8 kW 7625 kWh 5338 kWh 2288 kWh £1,480 £229 £1,708 £19,776 11.6 yrs £14,390

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: £1,093, Upfront: £15,423, Break-even: 14.1 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1906 kWh 1392 kWh 515 kWh £386 £51 £437 £9,319 21.3 yrs £-575
3 kW 2859 kWh 2087 kWh 772 kWh £579 £77 £656 £11,354 17.3 yrs £1,763
4 kW 3813 kWh 2783 kWh 1029 kWh £771 £103 £874 £13,388 15.3 yrs £4,100
5 kW 4766 kWh 3479 kWh 1287 kWh £964 £129 £1,093 £15,423 14.1 yrs £6,438
6 kW 5719 kWh 4175 kWh 1544 kWh £1,157 £154 £1,312 £17,457 13.3 yrs £8,776
7 kW 6672 kWh 4870 kWh 1801 kWh £1,350 £180 £1,530 £19,492 12.7 yrs £11,113
8 kW 7625 kWh 5566 kWh 2059 kWh £1,543 £206 £1,749 £21,526 12.3 yrs £13,451

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: £1,110, Upfront: £17,173, Break-even: 15.5 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1906 kWh 1430 kWh 477 kWh £396 £48 £444 £11,069 24.9 yrs £-2,190
3 kW 2859 kWh 2145 kWh 715 kWh £594 £71 £666 £13,104 19.7 yrs £216
4 kW 3813 kWh 2859 kWh 953 kWh £793 £95 £888 £15,138 17.0 yrs £2,621
5 kW 4766 kWh 3574 kWh 1191 kWh £991 £119 £1,110 £17,173 15.5 yrs £5,026
6 kW 5719 kWh 4289 kWh 1430 kWh £1,189 £143 £1,332 £19,207 14.4 yrs £7,431
7 kW 6672 kWh 5004 kWh 1668 kWh £1,387 £167 £1,554 £21,242 13.7 yrs £9,836
8 kW 7625 kWh 5719 kWh 1906 kWh £1,585 £191 £1,776 £23,276 13.1 yrs £12,241

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: £1,127, Upfront: £19,623, Break-even: 17.4 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1906 kWh 1468 kWh 438 kWh £407 £44 £451 £13,519 30.0 yrs £-4,505
3 kW 2859 kWh 2202 kWh 658 kWh £610 £66 £676 £15,554 23.0 yrs £-2,032
4 kW 3813 kWh 2936 kWh 877 kWh £814 £88 £901 £17,588 19.5 yrs £441
5 kW 4766 kWh 3670 kWh 1096 kWh £1,017 £110 £1,127 £19,623 17.4 yrs £2,914
6 kW 5719 kWh 4403 kWh 1315 kWh £1,221 £132 £1,352 £21,657 16.0 yrs £5,386
7 kW 6672 kWh 5137 kWh 1535 kWh £1,424 £153 £1,578 £23,692 15.0 yrs £7,859
8 kW 7625 kWh 5871 kWh 1754 kWh £1,628 £175 £1,803 £25,726 14.3 yrs £10,332

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 CH48

Figures below are tailored to CH48 — click through for full league tables.

Big-Roof Britain Rank #319 of 2182
5.9 kWp (UK avg 5.1 kWp)
~12 panels (≈430 W)
Solar Payback Index Rank #925 of 2997
10.8 years (UK avg 11.3 years)
~£1,129 /yr • £12,207 upfront
Standing-Charge Drag Rank #2024 of 2997
22.6% (UK avg 21.7%) drag on savings
£255 fixed • ~£1,129 /yr value

Your Area at a Glance

Your Electricity Rate
27.72p/kWh
Daily Fixed Charge
69.95p/day
Local Sunshine
953kWh/kW
A 1 kW system generates ~953 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: 59% • Flats: 30% • Bungalows: 9% Based on 3,737 properties

Coverage

Wirral (100%)

Areas Covered

West Kirby and Thurstaston, Hoylake and Meols, Greasby, Frankby and Irby

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

L48 (Wirral)
≈0.2 km away
Local sunshine: ~953 kWh/kWp · +0% vs CH48
CH29 (Wirral)
≈2.0 km away
Local sunshine: ~951 kWh/kWp · -0% vs CH48
CH47 (Wirral)
≈2.6 km away
Local sunshine: ~953 kWh/kWp · +0% vs CH48
L47 (Wirral)
≈2.7 km away
Local sunshine: ~953 kWh/kWp · +0% vs CH48
L49 (Wirral)
≈4.8 km away
Local sunshine: ~945 kWh/kWp · -1% vs CH48
CH49 (Wirral)
≈5.1 km away
Local sunshine: ~955 kWh/kWp · +0% vs CH48

Similar sunshine across the UK

NG2 (Nottingham)
~953 kWh/kWp · +0% vs CH48
NP8 (Powys)
~953 kWh/kWp · -0% vs CH48
S26 (Rotherham)
~953 kWh/kWp · -0% vs CH48