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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in CH28 (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
£10,173
What you pay to get started
Annual Benefit
£812
What you save every year
Profit Over 25 Years
£10,139
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 951 kWh/kW — 21 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 951 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)
951 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: £812, 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 1902 kWh 761 kWh 1141 kWh £211 £114 £325 £4,069 12.5 yrs £2,431
3 kW 2853 kWh 1141 kWh 1712 kWh £316 £171 £487 £6,104 12.5 yrs £3,646
4 kW 3804 kWh 1521 kWh 2282 kWh £422 £228 £650 £8,138 12.5 yrs £4,861
5 kW 4754 kWh 1902 kWh 2853 kWh £527 £285 £812 £10,173 12.5 yrs £6,076
6 kW 5705 kWh 2282 kWh 3423 kWh £633 £342 £975 £12,207 12.5 yrs £7,292
7 kW 6656 kWh 2663 kWh 3994 kWh £738 £399 £1,137 £14,242 12.5 yrs £8,507
8 kW 7607 kWh 3043 kWh 4564 kWh £843 £456 £1,300 £16,276 12.5 yrs £9,722

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: £981, 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 1902 kWh 1141 kWh 761 kWh £316 £76 £392 £6,169 15.7 yrs £1,679
3 kW 2853 kWh 1712 kWh 1141 kWh £474 £114 £589 £8,204 13.9 yrs £3,568
4 kW 3804 kWh 2282 kWh 1521 kWh £633 £152 £785 £10,238 13.0 yrs £5,457
5 kW 4754 kWh 2853 kWh 1902 kWh £791 £190 £981 £12,273 12.5 yrs £7,346
6 kW 5705 kWh 3423 kWh 2282 kWh £949 £228 £1,177 £14,307 12.2 yrs £9,236
7 kW 6656 kWh 3994 kWh 2663 kWh £1,107 £266 £1,373 £16,342 11.9 yrs £11,125
8 kW 7607 kWh 4564 kWh 3043 kWh £1,265 £304 £1,570 £18,376 11.7 yrs £13,014

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: £1,065, 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 1902 kWh 1331 kWh 571 kWh £369 £57 £426 £7,569 17.8 yrs £953
3 kW 2853 kWh 1997 kWh 856 kWh £554 £86 £639 £9,604 15.0 yrs £3,179
4 kW 3804 kWh 2663 kWh 1141 kWh £738 £114 £852 £11,638 13.7 yrs £5,405
5 kW 4754 kWh 3328 kWh 1426 kWh £923 £143 £1,065 £13,673 12.8 yrs £7,631
6 kW 5705 kWh 3994 kWh 1712 kWh £1,107 £171 £1,278 £15,707 12.3 yrs £9,858
7 kW 6656 kWh 4659 kWh 1997 kWh £1,292 £200 £1,491 £17,742 11.9 yrs £12,084
8 kW 7607 kWh 5325 kWh 2282 kWh £1,476 £228 £1,704 £19,776 11.6 yrs £14,310

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: £1,090, 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 1902 kWh 1388 kWh 513 kWh £385 £51 £436 £9,319 21.4 yrs £-595
3 kW 2853 kWh 2082 kWh 770 kWh £577 £77 £654 £11,354 17.4 yrs £1,732
4 kW 3804 kWh 2777 kWh 1027 kWh £770 £103 £872 £13,388 15.3 yrs £4,060
5 kW 4754 kWh 3471 kWh 1284 kWh £962 £128 £1,090 £15,423 14.1 yrs £6,387
6 kW 5705 kWh 4165 kWh 1540 kWh £1,155 £154 £1,309 £17,457 13.3 yrs £8,714
7 kW 6656 kWh 4859 kWh 1797 kWh £1,347 £180 £1,527 £19,492 12.8 yrs £11,042
8 kW 7607 kWh 5553 kWh 2054 kWh £1,539 £205 £1,745 £21,526 12.3 yrs £13,369

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: £1,107, 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 1902 kWh 1426 kWh 475 kWh £395 £48 £443 £11,069 25.0 yrs £-2,210
3 kW 2853 kWh 2140 kWh 713 kWh £593 £71 £664 £13,104 19.7 yrs £184
4 kW 3804 kWh 2853 kWh 951 kWh £791 £95 £886 £15,138 17.1 yrs £2,579
5 kW 4754 kWh 3566 kWh 1189 kWh £988 £119 £1,107 £17,173 15.5 yrs £4,974
6 kW 5705 kWh 4279 kWh 1426 kWh £1,186 £143 £1,329 £19,207 14.5 yrs £7,369
7 kW 6656 kWh 4992 kWh 1664 kWh £1,384 £166 £1,550 £21,242 13.7 yrs £9,763
8 kW 7607 kWh 5705 kWh 1902 kWh £1,582 £190 £1,772 £23,276 13.1 yrs £12,158

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: £1,124, Upfront: £19,623, Break-even: 17.5 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1902 kWh 1464 kWh 437 kWh £406 £44 £450 £13,519 30.1 yrs £-4,526
3 kW 2853 kWh 2197 kWh 656 kWh £609 £66 £675 £15,554 23.1 yrs £-2,063
4 kW 3804 kWh 2929 kWh 875 kWh £812 £87 £899 £17,588 19.6 yrs £399
5 kW 4754 kWh 3661 kWh 1094 kWh £1,015 £109 £1,124 £19,623 17.5 yrs £2,861
6 kW 5705 kWh 4393 kWh 1312 kWh £1,218 £131 £1,349 £21,657 16.1 yrs £5,323
7 kW 6656 kWh 5125 kWh 1531 kWh £1,421 £153 £1,574 £23,692 15.1 yrs £7,785
8 kW 7607 kWh 5858 kWh 1750 kWh £1,624 £175 £1,799 £25,726 14.3 yrs £10,247

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 CH28

Figures below are tailored to CH28 — click through for full league tables.

Solar Payback Index Rank #920 of 2997
10.8 years (UK avg 11.3 years)
~£939 /yr • £10,173 upfront
Standing-Charge Drag Rank #2426 of 2997
27.2% (UK avg 21.7%) drag on savings
£255 fixed • ~£939 /yr value

Your Area at a Glance

Your Electricity Rate
27.72p/kWh
Daily Fixed Charge
69.95p/day
Local Sunshine
951kWh/kW
A 1 kW system generates ~951 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

No EPC data available for this outcode

Coverage

Wirral (100%)

Areas Covered

Moreton West and Saughall Massie

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

CH46 (Wirral)
≈0.2 km away
Local sunshine: ~951 kWh/kWp · -0% vs CH28
L46 (Wirral)
≈0.3 km away
Local sunshine: ~951 kWh/kWp · +0% vs CH28
L49 (Wirral)
≈2.3 km away
Local sunshine: ~945 kWh/kWp · -1% vs CH28
CH49 (Wirral)
≈2.5 km away
Local sunshine: ~955 kWh/kWp · +0% vs CH28
CH30 (Wirral)
≈2.5 km away
Local sunshine: ~945 kWh/kWp · -1% vs CH28
CH43 (Wirral)
≈3.9 km away
Local sunshine: ~930 kWh/kWp · -2% vs CH28

Similar sunshine across the UK

DN6 (Doncaster)
~951 kWh/kWp · +0% vs CH28
NG5 (Gedling)
~951 kWh/kWp · +0% vs CH28
B91 (Solihull)
~951 kWh/kWp · -0% vs CH28