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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in L29 (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
12.6 years
After this, it's pure profit
Upfront Cost
£12,207
What you pay to get started
Annual Benefit
£968
What you save every year
Profit Over 25 Years
£11,989
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 944 kWh/kW — 14 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 944 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)
944 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: £807, Upfront: £10,173, Break-even: 12.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1888 kWh 755 kWh 1133 kWh £209 £113 £323 £4,069 12.6 yrs £2,383
3 kW 2832 kWh 1133 kWh 1699 kWh £314 £170 £484 £6,104 12.6 yrs £3,575
4 kW 3776 kWh 1510 kWh 2266 kWh £419 £227 £645 £8,138 12.6 yrs £4,767
5 kW 4720 kWh 1888 kWh 2832 kWh £523 £283 £807 £10,173 12.6 yrs £5,958
6 kW 5664 kWh 2266 kWh 3398 kWh £628 £340 £968 £12,207 12.6 yrs £7,150
7 kW 6608 kWh 2643 kWh 3965 kWh £733 £396 £1,129 £14,242 12.6 yrs £8,341
8 kW 7552 kWh 3021 kWh 4531 kWh £837 £453 £1,290 £16,276 12.6 yrs £9,533

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: £974, Upfront: £12,273, Break-even: 12.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1888 kWh 1133 kWh 755 kWh £314 £76 £390 £6,169 15.8 yrs £1,621
3 kW 2832 kWh 1699 kWh 1133 kWh £471 £113 £584 £8,204 14.0 yrs £3,482
4 kW 3776 kWh 2266 kWh 1510 kWh £628 £151 £779 £10,238 13.1 yrs £5,343
5 kW 4720 kWh 2832 kWh 1888 kWh £785 £189 £974 £12,273 12.6 yrs £7,204
6 kW 5664 kWh 3398 kWh 2266 kWh £942 £227 £1,169 £14,307 12.2 yrs £9,064
7 kW 6608 kWh 3965 kWh 2643 kWh £1,099 £264 £1,363 £16,342 12.0 yrs £10,925
8 kW 7552 kWh 4531 kWh 3021 kWh £1,256 £302 £1,558 £18,376 11.8 yrs £12,786

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: £1,057, Upfront: £13,673, 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 1888 kWh 1322 kWh 566 kWh £366 £57 £423 £7,569 17.9 yrs £891
3 kW 2832 kWh 1982 kWh 850 kWh £550 £85 £634 £9,604 15.1 yrs £3,086
4 kW 3776 kWh 2643 kWh 1133 kWh £733 £113 £846 £11,638 13.8 yrs £5,281
5 kW 4720 kWh 3304 kWh 1416 kWh £916 £142 £1,057 £13,673 12.9 yrs £7,476
6 kW 5664 kWh 3965 kWh 1699 kWh £1,099 £170 £1,269 £15,707 12.4 yrs £9,672
7 kW 6608 kWh 4626 kWh 1982 kWh £1,282 £198 £1,480 £17,742 12.0 yrs £11,867
8 kW 7552 kWh 5286 kWh 2266 kWh £1,465 £227 £1,692 £19,776 11.7 yrs £14,062

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: £1,083, Upfront: £15,423, Break-even: 14.2 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1888 kWh 1378 kWh 510 kWh £382 £51 £433 £9,319 21.5 yrs £-659
3 kW 2832 kWh 2067 kWh 765 kWh £573 £76 £650 £11,354 17.5 yrs £1,637
4 kW 3776 kWh 2756 kWh 1019 kWh £764 £102 £866 £13,388 15.5 yrs £3,933
5 kW 4720 kWh 3446 kWh 1274 kWh £955 £127 £1,083 £15,423 14.2 yrs £6,228
6 kW 5664 kWh 4135 kWh 1529 kWh £1,146 £153 £1,299 £17,457 13.4 yrs £8,524
7 kW 6608 kWh 4824 kWh 1784 kWh £1,337 £178 £1,516 £19,492 12.9 yrs £10,819
8 kW 7552 kWh 5513 kWh 2039 kWh £1,528 £204 £1,732 £21,526 12.4 yrs £13,115

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: £1,099, Upfront: £17,173, Break-even: 15.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1888 kWh 1416 kWh 472 kWh £393 £47 £440 £11,069 25.2 yrs £-2,275
3 kW 2832 kWh 2124 kWh 708 kWh £589 £71 £660 £13,104 19.9 yrs £88
4 kW 3776 kWh 2832 kWh 944 kWh £785 £94 £879 £15,138 17.2 yrs £2,450
5 kW 4720 kWh 3540 kWh 1180 kWh £981 £118 £1,099 £17,173 15.6 yrs £4,813
6 kW 5664 kWh 4248 kWh 1416 kWh £1,178 £142 £1,319 £19,207 14.6 yrs £7,175
7 kW 6608 kWh 4956 kWh 1652 kWh £1,374 £165 £1,539 £21,242 13.8 yrs £9,538
8 kW 7552 kWh 5664 kWh 1888 kWh £1,570 £189 £1,759 £23,276 13.2 yrs £11,900

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: £1,116, Upfront: £19,623, Break-even: 17.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1888 kWh 1454 kWh 434 kWh £403 £43 £446 £13,519 30.3 yrs £-4,591
3 kW 2832 kWh 2181 kWh 651 kWh £604 £65 £670 £15,554 23.2 yrs £-2,162
4 kW 3776 kWh 2907 kWh 868 kWh £806 £87 £893 £17,588 19.7 yrs £268
5 kW 4720 kWh 3634 kWh 1086 kWh £1,007 £109 £1,116 £19,623 17.6 yrs £2,697
6 kW 5664 kWh 4361 kWh 1303 kWh £1,209 £130 £1,339 £21,657 16.2 yrs £5,127
7 kW 6608 kWh 5088 kWh 1520 kWh £1,410 £152 £1,562 £23,692 15.2 yrs £7,556
8 kW 7552 kWh 5815 kWh 1737 kWh £1,612 £174 £1,786 £25,726 14.4 yrs £9,986

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 L29

Figures below are tailored to L29 — click through for full league tables.

Big-Roof Britain Rank #162 of 2182
6.3 kWp (UK avg 5.1 kWp)
~13 panels (≈430 W)
Solar Payback Index Rank #1141 of 2997
10.9 years (UK avg 11.3 years)
~£1,118 /yr • £12,207 upfront
Standing-Charge Drag Rank #2056 of 2997
22.8% (UK avg 21.7%) drag on savings
£255 fixed • ~£1,118 /yr value

Your Area at a Glance

Your Electricity Rate
27.72p/kWh
Daily Fixed Charge
69.95p/day
Local Sunshine
944kWh/kW
A 1 kW system generates ~944 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: 95% • Flats: 2% • Bungalows: 4% Based on 114 properties

Coverage

Sefton (100%)

Areas Covered

Park, Manor, Ravenmeols, Church

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

L30 (Sefton)
≈2.7 km away
Local sunshine: ~944 kWh/kWp · -0% vs L29
L31 (Sefton)
≈2.9 km away
Local sunshine: ~938 kWh/kWp · -1% vs L29
L23 (Sefton)
≈3.4 km away
Local sunshine: ~953 kWh/kWp · +1% vs L29
L72 (Sefton)
≈4.1 km away
Local sunshine: ~953 kWh/kWp · +1% vs L29
L21 (Sefton)
≈4.3 km away
Local sunshine: ~944 kWh/kWp · -0% vs L29
L80 (Sefton)
≈4.3 km away
Local sunshine: ~944 kWh/kWp · -0% vs L29

Similar sunshine across the UK

S63 (Rotherham)
~944 kWh/kWp · +0% vs L29
TS29 (County Durham)
~944 kWh/kWp · -0% vs L29
S97 (Rotherham)
~944 kWh/kWp · -0% vs L29