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Solar panel cost in Southwark (SE1P)

See realistic solar installation costs, savings and payback for SE1P (Southwark) in under a minute using official UK data. Start with the calculator, then get a no-obligation quote from an MCS-certified installer. You can also ask the SolarByPostcode assistant to sanity-check your roof, bills and plans.

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
9.9 years
After this, it's pure profit
Upfront Cost
£9,767
What you pay to get started
Annual Benefit
£986
What you save every year
Profit Over 25 Years
£14,879
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: The official cost per kW is lower above 4 kW, so a 5–6 kW system can pay back a little faster than a 3–4 kW system on otherwise identical assumptions.
  • 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

Panel costs: Uses March 2026 TIC mean installation costs: £1,827/kW up to 4 kW and £1,628/kW above 4 kW.

Other costs: Battery prices are modelled at £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 26.35p/kWh with a 44.78p/day standing charge. Your postcode’s south-facing sunshine yield is 993 kWh/kW — 3 above the regional median (991).

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 993 kWh per year on a south-facing roof. We value self-used electricity at 26.4p and exported surplus at a baseline 10p via SEG. Use the calculator above for your exact tariff.

Unit rate
26.4p/kWh
Standing charge
44.8p/day
Sunshine yield (south)
993 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: £822, Upfront: £8,139, Break-even: 9.9 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1987 kWh 795 kWh 1192 kWh £209 £119 £329 £3,256 9.9 yrs £3,317
3 kW 2980 kWh 1192 kWh 1788 kWh £314 £179 £493 £4,883 9.9 yrs £4,975
4 kW 3973 kWh 1589 kWh 2384 kWh £419 £238 £657 £6,511 9.9 yrs £6,633
5 kW 4967 kWh 1987 kWh 2980 kWh £524 £298 £822 £8,139 9.9 yrs £8,292
6 kW 5960 kWh 2384 kWh 3576 kWh £628 £358 £986 £9,767 9.9 yrs £9,950
7 kW 6954 kWh 2781 kWh 4172 kWh £733 £417 £1,150 £11,394 9.9 yrs £11,608
8 kW 7947 kWh 3179 kWh 4768 kWh £838 £477 £1,314 £13,022 9.9 yrs £13,266

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,628, battery £/kWh = 700.

3 kWh battery 5 kW example → Annual benefit: £984, Upfront: £10,239, Break-even: 10.4 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1987 kWh 1192 kWh 795 kWh £314 £79 £394 £5,356 13.6 yrs £2,516
3 kW 2980 kWh 1788 kWh 1192 kWh £471 £119 £590 £6,983 11.8 yrs £4,824
4 kW 3973 kWh 2384 kWh 1589 kWh £628 £159 £787 £8,611 10.9 yrs £7,132
5 kW 4967 kWh 2980 kWh 1987 kWh £785 £199 £984 £10,239 10.4 yrs £9,440
6 kW 5960 kWh 3576 kWh 2384 kWh £942 £238 £1,181 £11,867 10.1 yrs £11,748
7 kW 6954 kWh 4172 kWh 2781 kWh £1,099 £278 £1,378 £13,494 9.8 yrs £14,056
8 kW 7947 kWh 4768 kWh 3179 kWh £1,256 £318 £1,574 £15,122 9.6 yrs £16,364

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,628, battery £/kWh = 700.

5 kWh battery 5 kW example → Annual benefit: £1,065, Upfront: £11,639, Break-even: 10.9 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1987 kWh 1391 kWh 596 kWh £366 £60 £426 £6,756 15.9 yrs £1,766
3 kW 2980 kWh 2086 kWh 894 kWh £550 £89 £639 £8,383 13.1 yrs £4,398
4 kW 3973 kWh 2781 kWh 1192 kWh £733 £119 £852 £10,011 11.7 yrs £7,031
5 kW 4967 kWh 3477 kWh 1490 kWh £916 £149 £1,065 £11,639 10.9 yrs £9,664
6 kW 5960 kWh 4172 kWh 1788 kWh £1,099 £179 £1,278 £13,267 10.4 yrs £12,297
7 kW 6954 kWh 4868 kWh 2086 kWh £1,283 £209 £1,491 £14,894 10.0 yrs £14,930
8 kW 7947 kWh 5563 kWh 2384 kWh £1,466 £238 £1,704 £16,522 9.7 yrs £17,562

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,628, battery £/kWh = 700.

7.5 kWh battery 5 kW example → Annual benefit: £1,090, Upfront: £13,389, Break-even: 12.3 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1987 kWh 1450 kWh 536 kWh £382 £54 £436 £8,506 19.5 yrs £211
3 kW 2980 kWh 2175 kWh 805 kWh £573 £80 £654 £10,133 15.5 yrs £2,941
4 kW 3973 kWh 2901 kWh 1073 kWh £764 £107 £872 £11,761 13.5 yrs £5,671
5 kW 4967 kWh 3626 kWh 1341 kWh £955 £134 £1,090 £13,389 12.3 yrs £8,401
6 kW 5960 kWh 4351 kWh 1609 kWh £1,146 £161 £1,307 £15,017 11.5 yrs £11,132
7 kW 6954 kWh 5076 kWh 1877 kWh £1,338 £188 £1,525 £16,644 10.9 yrs £13,862
8 kW 7947 kWh 5801 kWh 2146 kWh £1,529 £215 £1,743 £18,272 10.5 yrs £16,592

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,628, battery £/kWh = 700.

10 kWh battery 5 kW example → Annual benefit: £1,106, Upfront: £15,139, Break-even: 13.7 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1987 kWh 1490 kWh 497 kWh £393 £50 £442 £10,256 23.2 yrs £-1,410
3 kW 2980 kWh 2235 kWh 745 kWh £589 £75 £663 £11,883 17.9 yrs £1,386
4 kW 3973 kWh 2980 kWh 993 kWh £785 £99 £885 £13,511 15.3 yrs £4,181
5 kW 4967 kWh 3725 kWh 1242 kWh £982 £124 £1,106 £15,139 13.7 yrs £6,976
6 kW 5960 kWh 4470 kWh 1490 kWh £1,178 £149 £1,327 £16,767 12.6 yrs £9,771
7 kW 6954 kWh 5215 kWh 1738 kWh £1,374 £174 £1,548 £18,394 11.9 yrs £12,567
8 kW 7947 kWh 5960 kWh 1987 kWh £1,571 £199 £1,769 £20,022 11.3 yrs £15,362

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,628, battery £/kWh = 700.

13.5 kWh battery 5 kW example → Annual benefit: £1,122, Upfront: £17,589, 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 1987 kWh 1530 kWh 457 kWh £403 £46 £449 £12,706 28.3 yrs £-3,730
3 kW 2980 kWh 2295 kWh 685 kWh £605 £69 £673 £14,333 21.3 yrs £-869
4 kW 3973 kWh 3060 kWh 914 kWh £806 £91 £898 £15,961 17.8 yrs £1,991
5 kW 4967 kWh 3824 kWh 1142 kWh £1,008 £114 £1,122 £17,589 15.7 yrs £4,851
6 kW 5960 kWh 4589 kWh 1371 kWh £1,209 £137 £1,346 £19,217 14.3 yrs £7,711
7 kW 6954 kWh 5354 kWh 1599 kWh £1,411 £160 £1,571 £20,844 13.3 yrs £10,571
8 kW 7947 kWh 6119 kWh 1828 kWh £1,612 £183 £1,795 £22,472 12.5 yrs £13,431

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,628, 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.

Before you request quotes in Southwark

Use the numbers above to sanity-check installer quotes. The main things to compare are system size, battery assumptions, payback claims, MCS certification, DNO paperwork and export assumptions.

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Check what MCS certification means

Understand DNO, G98 and G99 export limits

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This is a practical sanity-check request, not an instant quote promise. The Blue Ape quote route above remains available if you already want installer introductions.

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Insights for SE1P

Figures below are tailored to SE1P — click through for full league tables.

Solar Payback Index Rank #935 of 2996
9.9 years (UK avg 10.8 years)
~£985 /yr • £9,767 upfront
Standing-Charge Drag Rank #25 of 2996
16.5% (UK avg 26.6%) drag on savings
£163 fixed • ~£985 /yr value
Aspect Penalty View ranking →
East −22.0% West −19.5%
Typical output loss versus a south-facing roof (lower is better)

Seasonal solar output in SE1P

Monthly generation per kilowatt of solar panels

kWh 40 Jan 52 Feb 84 Mar 111 Apr 117 May 120 Jun 121 Jul 108 Aug 93 Sep 67 Oct 47 Nov 35 Dec
Best month Worst month Winter (Dec–Feb) Other months

Winter output: 51.1% of an average month (Dec–Feb)

Best / worst month: Jul / Dec

These figures show output per kilowatt (kW) of panels installed. In winter, a 1 kW system here produces about 42 kWh per month; the average month produces around 83 kWh. So a typical 4 kW home system would generate roughly 169 kWh in winter, or 331 kWh in an average month.

Your Area at a Glance

Your Electricity Rate
26.35p/kWh
Daily Fixed Charge
44.78p/day
Local Sunshine
993kWh/kW
A 1 kW system generates ~993 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

No EPC data available for this outcode

Coverage

Southwark (100%)

Areas Covered

London Bridge & West Bermondsey

Data Sources & Assumptions

Solar yield: PVGIS (EU Joint Research Centre), January 2025 data

Electricity rates: Ofgem price cap, Q3 2026

Installation costs: DESNZ/MCS data, March 2026 (TIC)

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

SE1 (Southwark)
≈0.8 km away
Local sunshine: ~991 kWh/kWp · -0% vs SE1P
SE17 (Southwark)
≈1.2 km away
Local sunshine: ~993 kWh/kWp · -0% vs SE1P
SE99 (Southwark)
≈1.6 km away
Local sunshine: ~993 kWh/kWp · -0% vs SE1P
SE16 (Southwark)
≈1.9 km away
Local sunshine: ~994 kWh/kWp · +0% vs SE1P
EC3R (City of London)
≈1.9 km away
Local sunshine: ~989 kWh/kWp · -0% vs SE1P
E98 (Tower Hamlets)
≈2.0 km away
Local sunshine: ~989 kWh/kWp · -0% vs SE1P

Similar sunshine across the UK

NN4 (West Northamptonshire)
~993 kWh/kWp · +0% vs SE1P
RG9 (South Oxfordshire)
~993 kWh/kWp · +0% vs SE1P
UB1 (Ealing)
~993 kWh/kWp · -0% vs SE1P