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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in L25 (Liverpool)

See if solar pays off for you in Liverpool — 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
12.9 years
After this, it's pure profit
Upfront Cost
£10,173
What you pay to get started
Annual Benefit
£787
What you save every year
Profit Over 25 Years
£9,496
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 921 kWh/kW — 9 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 921 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)
921 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: £787, Upfront: £10,173, Break-even: 12.9 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1842 kWh 737 kWh 1105 kWh £204 £110 £315 £4,069 12.9 yrs £2,225
3 kW 2762 kWh 1105 kWh 1657 kWh £306 £166 £472 £6,104 12.9 yrs £3,337
4 kW 3683 kWh 1473 kWh 2210 kWh £408 £221 £629 £8,138 12.9 yrs £4,450
5 kW 4604 kWh 1842 kWh 2762 kWh £511 £276 £787 £10,173 12.9 yrs £5,562
6 kW 5525 kWh 2210 kWh 3315 kWh £613 £331 £944 £12,207 12.9 yrs £6,675
7 kW 6446 kWh 2578 kWh 3867 kWh £715 £387 £1,101 £14,242 12.9 yrs £7,787
8 kW 7367 kWh 2947 kWh 4420 kWh £817 £442 £1,259 £16,276 12.9 yrs £8,900

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: £950, Upfront: £12,273, Break-even: 12.9 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1842 kWh 1105 kWh 737 kWh £306 £74 £380 £6,169 16.2 yrs £1,430
3 kW 2762 kWh 1657 kWh 1105 kWh £459 £110 £570 £8,204 14.4 yrs £3,195
4 kW 3683 kWh 2210 kWh 1473 kWh £613 £147 £760 £10,238 13.5 yrs £4,961
5 kW 4604 kWh 2762 kWh 1842 kWh £766 £184 £950 £12,273 12.9 yrs £6,726
6 kW 5525 kWh 3315 kWh 2210 kWh £919 £221 £1,140 £14,307 12.6 yrs £8,491
7 kW 6446 kWh 3867 kWh 2578 kWh £1,072 £258 £1,330 £16,342 12.3 yrs £10,256
8 kW 7367 kWh 4420 kWh 2947 kWh £1,225 £295 £1,520 £18,376 12.1 yrs £12,021

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: £1,032, Upfront: £13,673, Break-even: 13.3 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1842 kWh 1289 kWh 552 kWh £357 £55 £413 £7,569 18.3 yrs £683
3 kW 2762 kWh 1934 kWh 829 kWh £536 £83 £619 £9,604 15.5 yrs £2,775
4 kW 3683 kWh 2578 kWh 1105 kWh £715 £110 £825 £11,638 14.1 yrs £4,866
5 kW 4604 kWh 3223 kWh 1381 kWh £893 £138 £1,032 £13,673 13.3 yrs £6,958
6 kW 5525 kWh 3867 kWh 1657 kWh £1,072 £166 £1,238 £15,707 12.7 yrs £9,049
7 kW 6446 kWh 4512 kWh 1934 kWh £1,251 £193 £1,444 £17,742 12.3 yrs £11,141
8 kW 7367 kWh 5157 kWh 2210 kWh £1,429 £221 £1,650 £19,776 12.0 yrs £13,232

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: £1,056, Upfront: £15,423, Break-even: 14.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1842 kWh 1344 kWh 497 kWh £373 £50 £422 £9,319 22.1 yrs £-871
3 kW 2762 kWh 2017 kWh 746 kWh £559 £75 £634 £11,354 17.9 yrs £1,318
4 kW 3683 kWh 2689 kWh 994 kWh £745 £99 £845 £13,388 15.8 yrs £3,508
5 kW 4604 kWh 3361 kWh 1243 kWh £932 £124 £1,056 £15,423 14.6 yrs £5,697
6 kW 5525 kWh 4033 kWh 1492 kWh £1,118 £149 £1,267 £17,457 13.8 yrs £7,886
7 kW 6446 kWh 4705 kWh 1740 kWh £1,304 £174 £1,478 £19,492 13.2 yrs £10,076
8 kW 7367 kWh 5378 kWh 1989 kWh £1,491 £199 £1,690 £21,526 12.7 yrs £12,265

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: £1,072, Upfront: £17,173, Break-even: 16.0 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1842 kWh 1381 kWh 460 kWh £383 £46 £429 £11,069 25.8 yrs £-2,491
3 kW 2762 kWh 2072 kWh 691 kWh £574 £69 £643 £13,104 20.4 yrs £-236
4 kW 3683 kWh 2762 kWh 921 kWh £766 £92 £858 £15,138 17.6 yrs £2,019
5 kW 4604 kWh 3453 kWh 1151 kWh £957 £115 £1,072 £17,173 16.0 yrs £4,273
6 kW 5525 kWh 4144 kWh 1381 kWh £1,149 £138 £1,287 £19,207 14.9 yrs £6,528
7 kW 6446 kWh 4834 kWh 1611 kWh £1,340 £161 £1,501 £21,242 14.1 yrs £8,783
8 kW 7367 kWh 5525 kWh 1842 kWh £1,532 £184 £1,716 £23,276 13.6 yrs £11,037

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: £1,089, Upfront: £19,623, Break-even: 18.0 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1842 kWh 1418 kWh 424 kWh £393 £42 £435 £13,519 31.0 yrs £-4,810
3 kW 2762 kWh 2127 kWh 635 kWh £590 £64 £653 £15,554 23.8 yrs £-2,490
4 kW 3683 kWh 2836 kWh 847 kWh £786 £85 £871 £17,588 20.2 yrs £-170
5 kW 4604 kWh 3545 kWh 1059 kWh £983 £106 £1,089 £19,623 18.0 yrs £2,150
6 kW 5525 kWh 4254 kWh 1271 kWh £1,179 £127 £1,306 £21,657 16.6 yrs £4,470
7 kW 6446 kWh 4963 kWh 1483 kWh £1,376 £148 £1,524 £23,692 15.5 yrs £6,790
8 kW 7367 kWh 5672 kWh 1694 kWh £1,572 £169 £1,742 £25,726 14.8 yrs £9,109

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 L25

Figures below are tailored to L25 — click through for full league tables.

Big-Roof Britain Rank #1357 of 2182
4.8 kWp (UK avg 5.1 kWp)
~10 panels (≈430 W)
Solar Payback Index Rank #1533 of 2997
11.2 years (UK avg 11.3 years)
~£909 /yr • £10,173 upfront
Standing-Charge Drag Rank #2568 of 2997
28.1% (UK avg 21.7%) drag on savings
£255 fixed • ~£909 /yr value

Your Area at a Glance

Your Electricity Rate
27.72p/kWh
Daily Fixed Charge
69.95p/day
Local Sunshine
921kWh/kW
A 1 kW system generates ~921 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: 62% • Flats: 30% • Bungalows: 7% Based on 9,654 properties

Coverage

Liverpool (89%)|Knowsley (11%)

Areas Covered

Much Woolton & Hunts Cross, Belle Vale, Woolton Village, Gateacre, Halewood North, Halewood South, Springwood, Calderstones

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

L27 (Liverpool)
≈2.2 km away
Local sunshine: ~921 kWh/kWp · +0% vs L25
L26 (Knowsley)
≈2.5 km away
Local sunshine: ~915 kWh/kWp · -1% vs L25
L16 (Liverpool)
≈2.8 km away
Local sunshine: ~921 kWh/kWp · +0% vs L25
L18 (Liverpool)
≈3.2 km away
Local sunshine: ~920 kWh/kWp · -0% vs L25
L19 (Liverpool)
≈3.2 km away
Local sunshine: ~920 kWh/kWp · -0% vs L25
L24 (Liverpool)
≈4.0 km away
Local sunshine: ~913 kWh/kWp · -1% vs L25

Similar sunshine across the UK

LS8 (Leeds)
~921 kWh/kWp · -0% vs L25
ST12 (Stafford)
~921 kWh/kWp · +0% vs L25
TD12 (Scottish Borders)
~921 kWh/kWp · +0% vs L25