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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in SE28 (Greenwich)

See if solar pays off for you in Greenwich — 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
12.4 years
After this, it's pure profit
Upfront Cost
£8,138
What you pay to get started
Annual Benefit
£657
What you save every year
Profit Over 25 Years
£8,279
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 London, the current unit rate is 25.63p/kWh with a 46.06p/day standing charge. Your postcode’s south-facing sunshine yield is 1010 kWh/kW — 20 above the regional median (991).

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 1010 kWh per year on a south-facing roof. We value self-used electricity at 25.6p and exported surplus at a baseline 10p via SEG. Use the calculator above for your exact tariff.

Unit rate
25.6p/kWh
Standing charge
46.1p/day
Sunshine yield (south)
1010 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: £821, Upfront: £10,173, Break-even: 12.4 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2020 kWh 808 kWh 1212 kWh £207 £121 £328 £4,069 12.4 yrs £2,498
3 kW 3030 kWh 1212 kWh 1818 kWh £311 £182 £493 £6,104 12.4 yrs £3,747
4 kW 4041 kWh 1616 kWh 2424 kWh £414 £242 £657 £8,138 12.4 yrs £4,995
5 kW 5051 kWh 2020 kWh 3030 kWh £518 £303 £821 £10,173 12.4 yrs £6,244
6 kW 6061 kWh 2424 kWh 3637 kWh £621 £364 £985 £12,207 12.4 yrs £7,493
7 kW 7071 kWh 2828 kWh 4243 kWh £725 £424 £1,149 £14,242 12.4 yrs £8,742
8 kW 8081 kWh 3232 kWh 4849 kWh £828 £485 £1,313 £16,276 12.4 yrs £9,991

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: £979, 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 2020 kWh 1212 kWh 808 kWh £311 £81 £391 £6,169 15.8 yrs £1,661
3 kW 3030 kWh 1818 kWh 1212 kWh £466 £121 £587 £8,204 14.0 yrs £3,541
4 kW 4041 kWh 2424 kWh 1616 kWh £621 £162 £783 £10,238 13.1 yrs £5,422
5 kW 5051 kWh 3030 kWh 2020 kWh £777 £202 £979 £12,273 12.5 yrs £7,302
6 kW 6061 kWh 3637 kWh 2424 kWh £932 £242 £1,174 £14,307 12.2 yrs £9,182
7 kW 7071 kWh 4243 kWh 2828 kWh £1,087 £283 £1,370 £16,342 11.9 yrs £11,063
8 kW 8081 kWh 4849 kWh 3232 kWh £1,243 £323 £1,566 £18,376 11.7 yrs £12,943

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: £1,058, 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 2020 kWh 1414 kWh 606 kWh £362 £61 £423 £7,569 17.9 yrs £892
3 kW 3030 kWh 2121 kWh 909 kWh £544 £91 £635 £9,604 15.1 yrs £3,088
4 kW 4041 kWh 2828 kWh 1212 kWh £725 £121 £846 £11,638 13.8 yrs £5,285
5 kW 5051 kWh 3535 kWh 1515 kWh £906 £152 £1,058 £13,673 12.9 yrs £7,481
6 kW 6061 kWh 4243 kWh 1818 kWh £1,087 £182 £1,269 £15,707 12.4 yrs £9,677
7 kW 7071 kWh 4950 kWh 2121 kWh £1,269 £212 £1,481 £17,742 12.0 yrs £11,873
8 kW 8081 kWh 5657 kWh 2424 kWh £1,450 £242 £1,692 £19,776 11.7 yrs £14,069

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: £1,081, Upfront: £15,423, Break-even: 14.3 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2020 kWh 1475 kWh 545 kWh £378 £55 £433 £9,319 21.5 yrs £-668
3 kW 3030 kWh 2212 kWh 818 kWh £567 £82 £649 £11,354 17.5 yrs £1,623
4 kW 4041 kWh 2950 kWh 1091 kWh £756 £109 £865 £13,388 15.5 yrs £3,914
5 kW 5051 kWh 3687 kWh 1364 kWh £945 £136 £1,081 £15,423 14.3 yrs £6,204
6 kW 6061 kWh 4424 kWh 1636 kWh £1,134 £164 £1,298 £17,457 13.5 yrs £8,495
7 kW 7071 kWh 5162 kWh 1909 kWh £1,323 £191 £1,514 £19,492 12.9 yrs £10,786
8 kW 8081 kWh 5899 kWh 2182 kWh £1,512 £218 £1,730 £21,526 12.4 yrs £13,077

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: £1,097, Upfront: £17,173, Break-even: 15.7 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2020 kWh 1515 kWh 505 kWh £388 £51 £439 £11,069 25.2 yrs £-2,292
3 kW 3030 kWh 2273 kWh 758 kWh £583 £76 £658 £13,104 19.9 yrs £62
4 kW 4041 kWh 3030 kWh 1010 kWh £777 £101 £878 £15,138 17.2 yrs £2,416
5 kW 5051 kWh 3788 kWh 1263 kWh £971 £126 £1,097 £17,173 15.7 yrs £4,770
6 kW 6061 kWh 4546 kWh 1515 kWh £1,165 £152 £1,317 £19,207 14.6 yrs £7,124
7 kW 7071 kWh 5303 kWh 1768 kWh £1,359 £177 £1,536 £21,242 13.8 yrs £9,478
8 kW 8081 kWh 6061 kWh 2020 kWh £1,553 £202 £1,755 £23,276 13.3 yrs £11,832

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: £1,113, 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 2020 kWh 1556 kWh 465 kWh £399 £46 £445 £13,519 30.4 yrs £-4,616
3 kW 3030 kWh 2333 kWh 697 kWh £598 £70 £668 £15,554 23.3 yrs £-2,198
4 kW 4041 kWh 3111 kWh 929 kWh £797 £93 £890 £17,588 19.8 yrs £219
5 kW 5051 kWh 3889 kWh 1162 kWh £997 £116 £1,113 £19,623 17.6 yrs £2,636
6 kW 6061 kWh 4667 kWh 1394 kWh £1,196 £139 £1,336 £21,657 16.2 yrs £5,053
7 kW 7071 kWh 5445 kWh 1626 kWh £1,395 £163 £1,558 £23,692 15.2 yrs £7,470
8 kW 8081 kWh 6222 kWh 1859 kWh £1,595 £186 £1,781 £25,726 14.4 yrs £9,888

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 SE28

Figures below are tailored to SE28 — click through for full league tables.

Big-Roof Britain Rank #2132 of 2182
3.7 kWp (UK avg 5.1 kWp)
~8 panels (≈430 W)
Solar Payback Index Rank #1062 of 2997
10.8 years (UK avg 11.3 years)
~£751 /yr • £8,138 upfront
Standing-Charge Drag Rank #2000 of 2997
22.4% (UK avg 21.7%) drag on savings
£168 fixed • ~£751 /yr value

Your Area at a Glance

Your Electricity Rate
25.63p/kWh
Daily Fixed Charge
46.06p/day
Local Sunshine
1010kWh/kW
A 1 kW system generates ~1010 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: 48% • Flats: 48% • Bungalows: 0% Based on 6,130 properties

Coverage

Greenwich (87%)|Bexley (13%)

Areas Covered

West Thamesmead, Thamesmead Moorings, Thamesmead East, Plumstead & Glyndon

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 London

SE2 (Greenwich)
≈1.1 km away
Local sunshine: ~1,016 kWh/kWp · +1% vs SE28
DA18 (Bexley)
≈2.2 km away
Local sunshine: ~1,017 kWh/kWp · +1% vs SE28
SE18 (Greenwich)
≈2.8 km away
Local sunshine: ~1,011 kWh/kWp · +0% vs SE28
DA17 (Bexley)
≈3.2 km away
Local sunshine: ~1,014 kWh/kWp · +0% vs SE28
DA16 (Bexley)
≈4.0 km away
Local sunshine: ~1,016 kWh/kWp · +1% vs SE28
IG11 (Barking and Dagenham)
≈4.1 km away
Local sunshine: ~1,010 kWh/kWp · -0% vs SE28

Similar sunshine across the UK

CM16 (Epping Forest)
~1,010 kWh/kWp · +0% vs SE28
CB4 (South Cambridgeshire)
~1,010 kWh/kWp · -0% vs SE28
NR19 (Breckland)
~1,010 kWh/kWp · -0% vs SE28