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Solar panel cost in Bromley (BR7)

See realistic solar installation costs, savings and payback for BR7 (Bromley) 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
9.7 years
After this, it's pure profit
Upfront Cost
£9,767
What you pay to get started
Annual Benefit
£1,004
What you save every year
Profit Over 25 Years
£15,342
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 1012 kWh/kW — 21 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 1012 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)
1012 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: £837, Upfront: £8,139, Break-even: 9.7 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2024 kWh 810 kWh 1214 kWh £213 £121 £335 £3,256 9.7 yrs £3,440
3 kW 3036 kWh 1214 kWh 1822 kWh £320 £182 £502 £4,883 9.7 yrs £5,160
4 kW 4048 kWh 1619 kWh 2429 kWh £427 £243 £670 £6,511 9.7 yrs £6,880
5 kW 5060 kWh 2024 kWh 3036 kWh £533 £304 £837 £8,139 9.7 yrs £8,600
6 kW 6072 kWh 2429 kWh 3643 kWh £640 £364 £1,004 £9,767 9.7 yrs £10,320
7 kW 7084 kWh 2834 kWh 4250 kWh £747 £425 £1,172 £11,394 9.7 yrs £12,040
8 kW 8096 kWh 3238 kWh 4858 kWh £853 £486 £1,339 £13,022 9.7 yrs £13,760

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: £1,002, Upfront: £10,239, Break-even: 10.2 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2024 kWh 1214 kWh 810 kWh £320 £81 £401 £5,356 13.4 yrs £2,664
3 kW 3036 kWh 1822 kWh 1214 kWh £480 £121 £601 £6,983 11.6 yrs £5,046
4 kW 4048 kWh 2429 kWh 1619 kWh £640 £162 £802 £8,611 10.7 yrs £7,427
5 kW 5060 kWh 3036 kWh 2024 kWh £800 £202 £1,002 £10,239 10.2 yrs £9,809
6 kW 6072 kWh 3643 kWh 2429 kWh £960 £243 £1,203 £11,867 9.9 yrs £12,191
7 kW 7084 kWh 4250 kWh 2834 kWh £1,120 £283 £1,403 £13,494 9.6 yrs £14,573
8 kW 8096 kWh 4858 kWh 3238 kWh £1,280 £324 £1,604 £15,122 9.4 yrs £16,955

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: £1,085, Upfront: £11,639, Break-even: 10.7 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2024 kWh 1417 kWh 607 kWh £373 £61 £434 £6,756 15.6 yrs £1,926
3 kW 3036 kWh 2125 kWh 911 kWh £560 £91 £651 £8,383 12.9 yrs £4,638
4 kW 4048 kWh 2834 kWh 1214 kWh £747 £121 £868 £10,011 11.5 yrs £7,351
5 kW 5060 kWh 3542 kWh 1518 kWh £933 £152 £1,085 £11,639 10.7 yrs £10,064
6 kW 6072 kWh 4250 kWh 1822 kWh £1,120 £182 £1,302 £13,267 10.2 yrs £12,777
7 kW 7084 kWh 4959 kWh 2125 kWh £1,307 £213 £1,519 £14,894 9.8 yrs £15,490
8 kW 8096 kWh 5667 kWh 2429 kWh £1,493 £243 £1,736 £16,522 9.5 yrs £18,202

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: £1,110, Upfront: £13,389, Break-even: 12.1 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2024 kWh 1478 kWh 546 kWh £389 £55 £444 £8,506 19.2 yrs £374
3 kW 3036 kWh 2216 kWh 820 kWh £584 £82 £666 £10,133 15.2 yrs £3,186
4 kW 4048 kWh 2955 kWh 1093 kWh £779 £109 £888 £11,761 13.2 yrs £5,998
5 kW 5060 kWh 3694 kWh 1366 kWh £973 £137 £1,110 £13,389 12.1 yrs £8,810
6 kW 6072 kWh 4433 kWh 1639 kWh £1,168 £164 £1,332 £15,017 11.3 yrs £11,622
7 kW 7084 kWh 5171 kWh 1913 kWh £1,363 £191 £1,554 £16,644 10.7 yrs £14,435
8 kW 8096 kWh 5910 kWh 2186 kWh £1,557 £219 £1,776 £18,272 10.3 yrs £17,247

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: £1,127, Upfront: £15,139, Break-even: 13.4 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2024 kWh 1518 kWh 506 kWh £400 £51 £451 £10,256 22.8 yrs £-1,243
3 kW 3036 kWh 2277 kWh 759 kWh £600 £76 £676 £11,883 17.6 yrs £1,635
4 kW 4048 kWh 3036 kWh 1012 kWh £800 £101 £901 £13,511 15.0 yrs £4,513
5 kW 5060 kWh 3795 kWh 1265 kWh £1,000 £127 £1,127 £15,139 13.4 yrs £7,391
6 kW 6072 kWh 4554 kWh 1518 kWh £1,200 £152 £1,352 £16,767 12.4 yrs £10,270
7 kW 7084 kWh 5313 kWh 1771 kWh £1,400 £177 £1,577 £18,394 11.7 yrs £13,148
8 kW 8096 kWh 6072 kWh 2024 kWh £1,600 £202 £1,802 £20,022 11.1 yrs £16,026

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: £1,143, Upfront: £17,589, Break-even: 15.4 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2024 kWh 1559 kWh 466 kWh £411 £47 £457 £12,706 27.8 yrs £-3,561
3 kW 3036 kWh 2338 kWh 698 kWh £616 £70 £686 £14,333 20.9 yrs £-617
4 kW 4048 kWh 3117 kWh 931 kWh £821 £93 £914 £15,961 17.5 yrs £2,328
5 kW 5060 kWh 3896 kWh 1164 kWh £1,027 £116 £1,143 £17,589 15.4 yrs £5,272
6 kW 6072 kWh 4676 kWh 1397 kWh £1,232 £140 £1,372 £19,217 14.0 yrs £8,217
7 kW 7084 kWh 5455 kWh 1629 kWh £1,437 £163 £1,600 £20,844 13.0 yrs £11,161
8 kW 8096 kWh 6234 kWh 1862 kWh £1,643 £186 £1,829 £22,472 12.3 yrs £14,106

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 Bromley

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 BR7

Figures below are tailored to BR7 — click through for full league tables.

Big-Roof Britain Rank #555 of 2182
5.5 kWp (UK avg 5.1 kWp)
~12 panels (≈430 W)
Solar Payback Index Rank #418 of 2996
9.7 years (UK avg 10.8 years)
~£1,004 /yr • £9,767 upfront
Standing-Charge Drag Rank #3 of 2996
16.2% (UK avg 26.6%) drag on savings
£163 fixed • ~£1,004 /yr value
Aspect Penalty View ranking →
East −21.3% West −20.0%
Typical output loss versus a south-facing roof (lower is better)

Seasonal solar output in BR7

Monthly generation per kilowatt of solar panels

kWh 39 Jan 52 Feb 85 Mar 113 Apr 120 May 122 Jun 125 Jul 112 Aug 95 Sep 68 Oct 47 Nov 35 Dec
Best month Worst month Winter (Dec–Feb) Other months

Winter output: 49.7% 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 84 kWh. So a typical 4 kW home system would generate roughly 168 kWh in winter, or 337 kWh in an average month.

Your Area at a Glance

Your Electricity Rate
26.35p/kWh
Daily Fixed Charge
44.78p/day
Local Sunshine
1012kWh/kW
A 1 kW system generates ~1012 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: 62% • Flats: 29% • Bungalows: 5% Based on 4,211 properties

Coverage

Bromley (99%)|Greenwich (1%)

Areas Covered

Chislehurst, Bromley Town, Mottingham, Orpington, Bickley & Sundridge, Mottingham, Coldharbour & New Eltham

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

BR1 (Bromley)
≈3.1 km away
Local sunshine: ~1,007 kWh/kWp · -1% vs BR7
DA14 (Bexley)
≈3.6 km away
Local sunshine: ~1,017 kWh/kWp · +1% vs BR7
DA15 (Bexley)
≈3.8 km away
Local sunshine: ~1,018 kWh/kWp · +1% vs BR7
SE9 (Greenwich)
≈4.3 km away
Local sunshine: ~1,012 kWh/kWp · +0% vs BR7
SE12 (Lewisham)
≈5.0 km away
Local sunshine: ~1,007 kWh/kWp · -0% vs BR7
SE6 (Lewisham)
≈6.4 km away
Local sunshine: ~1,000 kWh/kWp · -1% vs BR7

Similar sunshine across the UK

CM18 (Harlow)
~1,012 kWh/kWp · +0% vs BR7
PE17 (Huntingdonshire)
~1,012 kWh/kWp · -0% vs BR7
PE26 (Huntingdonshire)
~1,012 kWh/kWp · -0% vs BR7