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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in L10 (Sefton)

See if solar pays off for you in Sefton — 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
12.8 years
After this, it's pure profit
Upfront Cost
£8,138
What you pay to get started
Annual Benefit
£636
What you save every year
Profit Over 25 Years
£7,769
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 931 kWh/kW — 1 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 931 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)
931 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: £795, Upfront: £10,173, 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 1862 kWh 745 kWh 1117 kWh £206 £112 £318 £4,069 12.8 yrs £2,294
3 kW 2793 kWh 1117 kWh 1676 kWh £310 £168 £477 £6,104 12.8 yrs £3,441
4 kW 3724 kWh 1489 kWh 2234 kWh £413 £223 £636 £8,138 12.8 yrs £4,588
5 kW 4654 kWh 1862 kWh 2793 kWh £516 £279 £795 £10,173 12.8 yrs £5,734
6 kW 5585 kWh 2234 kWh 3351 kWh £619 £335 £954 £12,207 12.8 yrs £6,881
7 kW 6516 kWh 2606 kWh 3910 kWh £723 £391 £1,113 £14,242 12.8 yrs £8,028
8 kW 7447 kWh 2979 kWh 4468 kWh £826 £447 £1,273 £16,276 12.8 yrs £9,175

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: £960, Upfront: £12,273, 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 1862 kWh 1117 kWh 745 kWh £310 £74 £384 £6,169 16.1 yrs £1,513
3 kW 2793 kWh 1676 kWh 1117 kWh £464 £112 £576 £8,204 14.2 yrs £3,320
4 kW 3724 kWh 2234 kWh 1489 kWh £619 £149 £768 £10,238 13.3 yrs £5,127
5 kW 4654 kWh 2793 kWh 1862 kWh £774 £186 £960 £12,273 12.8 yrs £6,934
6 kW 5585 kWh 3351 kWh 2234 kWh £929 £223 £1,152 £14,307 12.4 yrs £8,740
7 kW 6516 kWh 3910 kWh 2606 kWh £1,084 £261 £1,344 £16,342 12.2 yrs £10,547
8 kW 7447 kWh 4468 kWh 2979 kWh £1,239 £298 £1,536 £18,376 12.0 yrs £12,354

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: £1,043, 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 1862 kWh 1303 kWh 559 kWh £361 £56 £417 £7,569 18.1 yrs £773
3 kW 2793 kWh 1955 kWh 838 kWh £542 £84 £626 £9,604 15.3 yrs £2,910
4 kW 3724 kWh 2606 kWh 1117 kWh £723 £112 £834 £11,638 14.0 yrs £5,046
5 kW 4654 kWh 3258 kWh 1396 kWh £903 £140 £1,043 £13,673 13.1 yrs £7,183
6 kW 5585 kWh 3910 kWh 1676 kWh £1,084 £168 £1,251 £15,707 12.6 yrs £9,320
7 kW 6516 kWh 4561 kWh 1955 kWh £1,264 £195 £1,460 £17,742 12.2 yrs £11,456
8 kW 7447 kWh 5213 kWh 2234 kWh £1,445 £223 £1,668 £19,776 11.9 yrs £13,593

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: £1,068, 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 1862 kWh 1359 kWh 503 kWh £377 £50 £427 £9,319 21.8 yrs £-779
3 kW 2793 kWh 2039 kWh 754 kWh £565 £75 £641 £11,354 17.7 yrs £1,457
4 kW 3724 kWh 2718 kWh 1005 kWh £753 £101 £854 £13,388 15.7 yrs £3,692
5 kW 4654 kWh 3398 kWh 1257 kWh £942 £126 £1,068 £15,423 14.4 yrs £5,928
6 kW 5585 kWh 4077 kWh 1508 kWh £1,130 £151 £1,281 £17,457 13.6 yrs £8,164
7 kW 6516 kWh 4757 kWh 1759 kWh £1,319 £176 £1,495 £19,492 13.0 yrs £10,399
8 kW 7447 kWh 5436 kWh 2011 kWh £1,507 £201 £1,708 £21,526 12.6 yrs £12,635

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: £1,084, 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 1862 kWh 1396 kWh 465 kWh £387 £47 £434 £11,069 25.5 yrs £-2,397
3 kW 2793 kWh 2095 kWh 698 kWh £581 £70 £650 £13,104 20.1 yrs £-95
4 kW 3724 kWh 2793 kWh 931 kWh £774 £93 £867 £15,138 17.5 yrs £2,206
5 kW 4654 kWh 3491 kWh 1164 kWh £968 £116 £1,084 £17,173 15.8 yrs £4,508
6 kW 5585 kWh 4189 kWh 1396 kWh £1,161 £140 £1,301 £19,207 14.8 yrs £6,809
7 kW 6516 kWh 4887 kWh 1629 kWh £1,355 £163 £1,518 £21,242 14.0 yrs £9,111
8 kW 7447 kWh 5585 kWh 1862 kWh £1,548 £186 £1,734 £23,276 13.4 yrs £11,413

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: £1,101, 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 1862 kWh 1434 kWh 428 kWh £397 £43 £440 £13,519 30.7 yrs £-4,715
3 kW 2793 kWh 2150 kWh 642 kWh £596 £64 £660 £15,554 23.6 yrs £-2,347
4 kW 3724 kWh 2867 kWh 856 kWh £795 £86 £880 £17,588 20.0 yrs £20
5 kW 4654 kWh 3584 kWh 1071 kWh £993 £107 £1,101 £19,623 17.8 yrs £2,388
6 kW 5585 kWh 4301 kWh 1285 kWh £1,192 £128 £1,321 £21,657 16.4 yrs £4,755
7 kW 6516 kWh 5017 kWh 1499 kWh £1,391 £150 £1,541 £23,692 15.4 yrs £7,123
8 kW 7447 kWh 5734 kWh 1713 kWh £1,590 £171 £1,761 £25,726 14.6 yrs £9,490

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 L10

Figures below are tailored to L10 — click through for full league tables.

Big-Roof Britain Rank #1616 of 2182
4.6 kWp (UK avg 5.1 kWp)
~10 panels (≈430 W)
Solar Payback Index Rank #1386 of 2997
11.1 years (UK avg 11.3 years)
~£735 /yr • £8,138 upfront
Standing-Charge Drag Rank #2842 of 2997
34.7% (UK avg 21.7%) drag on savings
£255 fixed • ~£735 /yr value

Your Area at a Glance

Your Electricity Rate
27.72p/kWh
Daily Fixed Charge
69.95p/day
Local Sunshine
931kWh/kW
A 1 kW system generates ~931 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: 82% • Flats: 11% • Bungalows: 6% Based on 3,266 properties

Coverage

Sefton (42%)|Liverpool (39%)|Knowsley (19%)

Areas Covered

Molyneux, Fazakerley East, Cherryfield, Fazakerley West, Park

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

L9 (Liverpool)
≈1.8 km away
Local sunshine: ~944 kWh/kWp · +1% vs L10
L72 (Sefton)
≈2.2 km away
Local sunshine: ~953 kWh/kWp · +2% vs L10
L68 (Sefton)
≈2.3 km away
Local sunshine: ~944 kWh/kWp · +1% vs L10
L11 (Liverpool)
≈2.6 km away
Local sunshine: ~922 kWh/kWp · -1% vs L10
L80 (Sefton)
≈2.7 km away
Local sunshine: ~944 kWh/kWp · +1% vs L10
L32 (Knowsley)
≈2.9 km away
Local sunshine: ~922 kWh/kWp · -1% vs L10

Similar sunshine across the UK

ST15 (Stafford)
~931 kWh/kWp · +0% vs L10
WV14 (Wolverhampton)
~931 kWh/kWp · -0% vs L10
TS11 (Redcar and Cleveland)
~931 kWh/kWp · +0% vs L10