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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in BR2 (Bromley)

See if solar pays off for you in Bromley — 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
12.1 years
After this, it's pure profit
Upfront Cost
£12,207
What you pay to get started
Annual Benefit
£1,005
What you save every year
Profit Over 25 Years
£12,921
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 South East, the current unit rate is 26.92p/kWh with a 47.60p/day standing charge. Your postcode’s south-facing sunshine yield is 999 kWh/kW — 30 below the regional median (1029).

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 999 kWh per year on a south-facing roof. We value self-used electricity at 26.9p and exported surplus at a baseline 10p via SEG. Use the calculator above for your exact tariff.

Unit rate
26.9p/kWh
Standing charge
47.6p/day
Sunshine yield (south)
999 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: £838, Upfront: £10,173, 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 1998 kWh 799 kWh 1199 kWh £215 £120 £335 £4,069 12.1 yrs £2,632
3 kW 2997 kWh 1199 kWh 1798 kWh £323 £180 £503 £6,104 12.1 yrs £3,948
4 kW 3996 kWh 1598 kWh 2398 kWh £430 £240 £670 £8,138 12.1 yrs £5,263
5 kW 4995 kWh 1998 kWh 2997 kWh £538 £300 £838 £10,173 12.1 yrs £6,579
6 kW 5994 kWh 2398 kWh 3597 kWh £645 £360 £1,005 £12,207 12.1 yrs £7,895
7 kW 6993 kWh 2797 kWh 4196 kWh £753 £420 £1,173 £14,242 12.1 yrs £9,211
8 kW 7992 kWh 3197 kWh 4795 kWh £861 £480 £1,340 £16,276 12.1 yrs £10,527

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: £1,007, Upfront: £12,273, Break-even: 12.2 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1998 kWh 1199 kWh 799 kWh £323 £80 £403 £6,169 15.3 yrs £1,884
3 kW 2997 kWh 1798 kWh 1199 kWh £484 £120 £604 £8,204 13.6 yrs £3,876
4 kW 3996 kWh 2398 kWh 1598 kWh £645 £160 £805 £10,238 12.7 yrs £5,868
5 kW 4995 kWh 2997 kWh 1998 kWh £807 £200 £1,007 £12,273 12.2 yrs £7,860
6 kW 5994 kWh 3597 kWh 2398 kWh £968 £240 £1,208 £14,307 11.8 yrs £9,852
7 kW 6993 kWh 4196 kWh 2797 kWh £1,130 £280 £1,409 £16,342 11.6 yrs £11,844
8 kW 7992 kWh 4795 kWh 3197 kWh £1,291 £320 £1,611 £18,376 11.4 yrs £13,836

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: £1,091, Upfront: £13,673, 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 1998 kWh 1399 kWh 599 kWh £377 £60 £436 £7,569 17.3 yrs £1,160
3 kW 2997 kWh 2098 kWh 899 kWh £565 £90 £655 £9,604 14.7 yrs £3,490
4 kW 3996 kWh 2797 kWh 1199 kWh £753 £120 £873 £11,638 13.3 yrs £5,820
5 kW 4995 kWh 3497 kWh 1499 kWh £941 £150 £1,091 £13,673 12.5 yrs £8,150
6 kW 5994 kWh 4196 kWh 1798 kWh £1,130 £180 £1,309 £15,707 12.0 yrs £10,481
7 kW 6993 kWh 4895 kWh 2098 kWh £1,318 £210 £1,528 £17,742 11.6 yrs £12,811
8 kW 7992 kWh 5595 kWh 2398 kWh £1,506 £240 £1,746 £19,776 11.3 yrs £15,141

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: £1,117, Upfront: £15,423, Break-even: 13.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1998 kWh 1459 kWh 539 kWh £393 £54 £447 £9,319 20.9 yrs £-387
3 kW 2997 kWh 2188 kWh 809 kWh £589 £81 £670 £11,354 16.9 yrs £2,045
4 kW 3996 kWh 2917 kWh 1079 kWh £785 £108 £893 £13,388 15.0 yrs £4,476
5 kW 4995 kWh 3646 kWh 1349 kWh £982 £135 £1,117 £15,423 13.8 yrs £6,908
6 kW 5994 kWh 4376 kWh 1618 kWh £1,178 £162 £1,340 £17,457 13.0 yrs £9,339
7 kW 6993 kWh 5105 kWh 1888 kWh £1,374 £189 £1,563 £19,492 12.5 yrs £11,771
8 kW 7992 kWh 5834 kWh 2158 kWh £1,571 £216 £1,786 £21,526 12.0 yrs £14,202

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: £1,133, Upfront: £17,173, Break-even: 15.2 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1998 kWh 1499 kWh 500 kWh £403 £50 £453 £11,069 24.4 yrs £-2,002
3 kW 2997 kWh 2248 kWh 749 kWh £605 £75 £680 £13,104 19.3 yrs £497
4 kW 3996 kWh 2997 kWh 999 kWh £807 £100 £907 £15,138 16.7 yrs £2,997
5 kW 4995 kWh 3746 kWh 1249 kWh £1,009 £125 £1,133 £17,173 15.2 yrs £5,496
6 kW 5994 kWh 4496 kWh 1499 kWh £1,210 £150 £1,360 £19,207 14.1 yrs £7,995
7 kW 6993 kWh 5245 kWh 1748 kWh £1,412 £175 £1,587 £21,242 13.4 yrs £10,494
8 kW 7992 kWh 5994 kWh 1998 kWh £1,614 £200 £1,813 £23,276 12.8 yrs £12,993

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: £1,150, Upfront: £19,623, Break-even: 17.1 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1998 kWh 1539 kWh 460 kWh £414 £46 £460 £13,519 29.4 yrs £-4,317
3 kW 2997 kWh 2308 kWh 689 kWh £621 £69 £690 £15,554 22.5 yrs £-1,750
4 kW 3996 kWh 3077 kWh 919 kWh £828 £92 £920 £17,588 19.1 yrs £817
5 kW 4995 kWh 3846 kWh 1149 kWh £1,035 £115 £1,150 £19,623 17.1 yrs £3,384
6 kW 5994 kWh 4616 kWh 1379 kWh £1,243 £138 £1,380 £21,657 15.7 yrs £5,950
7 kW 6993 kWh 5385 kWh 1608 kWh £1,450 £161 £1,610 £23,692 14.7 yrs £8,517
8 kW 7992 kWh 6154 kWh 1838 kWh £1,657 £184 £1,841 £25,726 14.0 yrs £11,084

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 BR2

Figures below are tailored to BR2 — click through for full league tables.

Big-Roof Britain Rank #1237 of 2182
4.9 kWp (UK avg 5.1 kWp)
~10 panels (≈430 W)
Solar Payback Index Rank #469 of 2997
10.5 years (UK avg 11.3 years)
~£1,157 /yr • £12,207 upfront
Standing-Charge Drag Rank #244 of 2997
15.0% (UK avg 21.7%) drag on savings
£174 fixed • ~£1,157 /yr value

Your Area at a Glance

Your Electricity Rate
26.92p/kWh
Daily Fixed Charge
47.60p/day
Local Sunshine
999kWh/kW
A 1 kW system generates ~999 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: 55% • Flats: 38% • Bungalows: 2% Based on 11,729 properties

Coverage

Bromley (100%)

Areas Covered

Bromley Common & Holwood, Bromley Town, Shortlands & Park Langley, Hayes & Coney Hall, Darwin, Bickley & Sundridge

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 South East

BR4 (Bromley)
≈2.9 km away
Local sunshine: ~1,000 kWh/kWp · +0% vs BR2
BR5 (Bromley)
≈6.1 km away
Local sunshine: ~1,011 kWh/kWp · +1% vs BR2
BR6 (Bromley)
≈6.1 km away
Local sunshine: ~1,010 kWh/kWp · +1% vs BR2
SE25 (Croydon)
≈6.8 km away
Local sunshine: ~996 kWh/kWp · -0% vs BR2
SE19 (Croydon)
≈7.5 km away
Local sunshine: ~996 kWh/kWp · -0% vs BR2
CR0 (Croydon)
≈7.7 km away
Local sunshine: ~996 kWh/kWp · -0% vs BR2

Similar sunshine across the UK

SN10 (Wiltshire)
~999 kWh/kWp · -0% vs BR2
LN5 (Lincoln)
~999 kWh/kWp · -0% vs BR2
PE32 (King's Lynn and West Norfolk)
~999 kWh/kWp · +0% vs BR2