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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in L13 (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
12.7 years
After this, it's pure profit
Upfront Cost
£8,138
What you pay to get started
Annual Benefit
£639
What you save every year
Profit Over 25 Years
£7,828
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 934 kWh/kW — 4 above the regional median (930).

Read the full story

A typical roof here lands around 4.0 kW, with most eligible homes comfortably fitting within 3–6 kW. Each kilowatt of panels produces roughly 934 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)
934 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: £798, 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 1869 kWh 747 kWh 1121 kWh £207 £112 £319 £4,069 12.7 yrs £2,317
3 kW 2803 kWh 1121 kWh 1682 kWh £311 £168 £479 £6,104 12.7 yrs £3,476
4 kW 3737 kWh 1495 kWh 2242 kWh £414 £224 £639 £8,138 12.7 yrs £4,634
5 kW 4672 kWh 1869 kWh 2803 kWh £518 £280 £798 £10,173 12.7 yrs £5,793
6 kW 5606 kWh 2242 kWh 3364 kWh £622 £336 £958 £12,207 12.7 yrs £6,952
7 kW 6540 kWh 2616 kWh 3924 kWh £725 £392 £1,118 £14,242 12.7 yrs £8,110
8 kW 7475 kWh 2990 kWh 4485 kWh £829 £448 £1,277 £16,276 12.7 yrs £9,269

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: £964, 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 1869 kWh 1121 kWh 747 kWh £311 £75 £386 £6,169 16.0 yrs £1,542
3 kW 2803 kWh 1682 kWh 1121 kWh £466 £112 £578 £8,204 14.2 yrs £3,363
4 kW 3737 kWh 2242 kWh 1495 kWh £622 £149 £771 £10,238 13.3 yrs £5,183
5 kW 4672 kWh 2803 kWh 1869 kWh £777 £187 £964 £12,273 12.7 yrs £7,004
6 kW 5606 kWh 3364 kWh 2242 kWh £932 £224 £1,157 £14,307 12.4 yrs £8,825
7 kW 6540 kWh 3924 kWh 2616 kWh £1,088 £262 £1,349 £16,342 12.1 yrs £10,646
8 kW 7475 kWh 4485 kWh 2990 kWh £1,243 £299 £1,542 £18,376 11.9 yrs £12,467

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: £1,047, Upfront: £13,673, Break-even: 13.1 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1869 kWh 1308 kWh 561 kWh £363 £56 £419 £7,569 18.1 yrs £804
3 kW 2803 kWh 1962 kWh 841 kWh £544 £84 £628 £9,604 15.3 yrs £2,956
4 kW 3737 kWh 2616 kWh 1121 kWh £725 £112 £837 £11,638 13.9 yrs £5,108
5 kW 4672 kWh 3270 kWh 1401 kWh £906 £140 £1,047 £13,673 13.1 yrs £7,260
6 kW 5606 kWh 3924 kWh 1682 kWh £1,088 £168 £1,256 £15,707 12.5 yrs £9,412
7 kW 6540 kWh 4578 kWh 1962 kWh £1,269 £196 £1,465 £17,742 12.1 yrs £11,564
8 kW 7475 kWh 5232 kWh 2242 kWh £1,450 £224 £1,675 £19,776 11.8 yrs £13,716

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: £1,071, Upfront: £15,423, Break-even: 14.4 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1869 kWh 1364 kWh 505 kWh £378 £50 £429 £9,319 21.7 yrs £-747
3 kW 2803 kWh 2046 kWh 757 kWh £567 £76 £643 £11,354 17.7 yrs £1,504
4 kW 3737 kWh 2728 kWh 1009 kWh £756 £101 £857 £13,388 15.6 yrs £3,755
5 kW 4672 kWh 3410 kWh 1261 kWh £945 £126 £1,071 £15,423 14.4 yrs £6,007
6 kW 5606 kWh 4092 kWh 1514 kWh £1,134 £151 £1,286 £17,457 13.6 yrs £8,258
7 kW 6540 kWh 4774 kWh 1766 kWh £1,323 £177 £1,500 £19,492 13.0 yrs £10,509
8 kW 7475 kWh 5456 kWh 2018 kWh £1,513 £202 £1,714 £21,526 12.6 yrs £12,761

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: £1,088, Upfront: £17,173, Break-even: 15.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1869 kWh 1401 kWh 467 kWh £388 £47 £435 £11,069 25.4 yrs £-2,365
3 kW 2803 kWh 2102 kWh 701 kWh £583 £70 £653 £13,104 20.1 yrs £-47
4 kW 3737 kWh 2803 kWh 934 kWh £777 £93 £870 £15,138 17.4 yrs £2,270
5 kW 4672 kWh 3504 kWh 1168 kWh £971 £117 £1,088 £17,173 15.8 yrs £4,588
6 kW 5606 kWh 4204 kWh 1401 kWh £1,165 £140 £1,306 £19,207 14.7 yrs £6,905
7 kW 6540 kWh 4905 kWh 1635 kWh £1,360 £164 £1,523 £21,242 13.9 yrs £9,223
8 kW 7475 kWh 5606 kWh 1869 kWh £1,554 £187 £1,741 £23,276 13.4 yrs £11,540

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: £1,105, Upfront: £19,623, Break-even: 17.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1869 kWh 1439 kWh 430 kWh £399 £43 £442 £13,519 30.6 yrs £-4,682
3 kW 2803 kWh 2158 kWh 645 kWh £598 £64 £663 £15,554 23.5 yrs £-2,299
4 kW 3737 kWh 2878 kWh 860 kWh £798 £86 £884 £17,588 19.9 yrs £85
5 kW 4672 kWh 3597 kWh 1074 kWh £997 £107 £1,105 £19,623 17.8 yrs £2,469
6 kW 5606 kWh 4317 kWh 1289 kWh £1,197 £129 £1,325 £21,657 16.3 yrs £4,853
7 kW 6540 kWh 5036 kWh 1504 kWh £1,396 £150 £1,546 £23,692 15.3 yrs £7,236
8 kW 7475 kWh 5755 kWh 1719 kWh £1,595 £172 £1,767 £25,726 14.6 yrs £9,620

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 L13

Figures below are tailored to L13 — click through for full league tables.

Big-Roof Britain Rank #1726 of 2182
4.5 kWp (UK avg 5.1 kWp)
~9 panels (≈430 W)
Solar Payback Index Rank #1213 of 2997
11.0 years (UK avg 11.3 years)
~£738 /yr • £8,138 upfront
Standing-Charge Drag Rank #2834 of 2997
34.6% (UK avg 21.7%) drag on savings
£255 fixed • ~£738 /yr value

Your Area at a Glance

Your Electricity Rate
27.72p/kWh
Daily Fixed Charge
69.95p/day
Local Sunshine
934kWh/kW
A 1 kW system generates ~934 kWh per year. A typical home uses ~2,700 kWh per year.
Typical System Size
4.0kW
For houses & bungalows in this area

Local Property Data

Property Types

Houses: 69% • Flats: 29% • Bungalows: 2% Based on 11,002 properties

Coverage

Liverpool (100%)

Areas Covered

Old Swan West, Tuebrook Larkhill, Stoneycroft, Old Swan East, Smithdown, Broadgreen, Wavertree Garden Suburb, Sandfield Park + 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

L15 (Liverpool)
≈2.0 km away
Local sunshine: ~920 kWh/kWp · -2% vs L13
L6 (Liverpool)
≈2.1 km away
Local sunshine: ~934 kWh/kWp · -0% vs L13
L7 (Liverpool)
≈2.1 km away
Local sunshine: ~934 kWh/kWp · -0% vs L13
L12 (Liverpool)
≈2.5 km away
Local sunshine: ~926 kWh/kWp · -1% vs L13
L16 (Liverpool)
≈2.9 km away
Local sunshine: ~921 kWh/kWp · -1% vs L13
L14 (Liverpool)
≈2.9 km away
Local sunshine: ~926 kWh/kWp · -1% vs L13

Similar sunshine across the UK

HG5 (North Yorkshire)
~934 kWh/kWp · -0% vs L13
B21 (Birmingham)
~935 kWh/kWp · +0% vs L13
LS22 (Leeds)
~935 kWh/kWp · +0% vs L13