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Solar panel cost in Bexley (DA8)

See realistic solar installation costs, savings and payback for DA8 (Bexley) 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
£8,139
What you pay to get started
Annual Benefit
£842
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: 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 1019 kWh/kW — 28 above the regional median (991).

Read the full story

A typical roof here lands around 5.0 kW, with most eligible homes comfortably fitting within 3–6 kW. Each kilowatt of panels produces roughly 1019 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)
1019 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: £842, 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 2037 kWh 815 kWh 1222 kWh £215 £122 £337 £3,256 9.7 yrs £3,484
3 kW 3056 kWh 1222 kWh 1833 kWh £322 £183 £505 £4,883 9.7 yrs £5,225
4 kW 4074 kWh 1630 kWh 2445 kWh £429 £244 £674 £6,511 9.7 yrs £6,967
5 kW 5093 kWh 2037 kWh 3056 kWh £537 £306 £842 £8,139 9.7 yrs £8,709
6 kW 6112 kWh 2445 kWh 3667 kWh £644 £367 £1,011 £9,767 9.7 yrs £10,451
7 kW 7130 kWh 2852 kWh 4278 kWh £752 £428 £1,179 £11,394 9.7 yrs £12,192
8 kW 8149 kWh 3260 kWh 4889 kWh £859 £489 £1,348 £13,022 9.7 yrs £13,934

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: £1,009, Upfront: £10,239, Break-even: 10.1 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2037 kWh 1222 kWh 815 kWh £322 £81 £404 £5,356 13.3 yrs £2,716
3 kW 3056 kWh 1833 kWh 1222 kWh £483 £122 £605 £6,983 11.5 yrs £5,124
4 kW 4074 kWh 2445 kWh 1630 kWh £644 £163 £807 £8,611 10.7 yrs £7,532
5 kW 5093 kWh 3056 kWh 2037 kWh £805 £204 £1,009 £10,239 10.1 yrs £9,940
6 kW 6112 kWh 3667 kWh 2445 kWh £966 £244 £1,211 £11,867 9.8 yrs £12,348
7 kW 7130 kWh 4278 kWh 2852 kWh £1,127 £285 £1,412 £13,494 9.6 yrs £14,756
8 kW 8149 kWh 4889 kWh 3260 kWh £1,288 £326 £1,614 £15,122 9.4 yrs £17,163

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: £1,092, 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 2037 kWh 1426 kWh 611 kWh £376 £61 £437 £6,756 15.5 yrs £1,982
3 kW 3056 kWh 2139 kWh 917 kWh £564 £92 £655 £8,383 12.8 yrs £4,723
4 kW 4074 kWh 2852 kWh 1222 kWh £752 £122 £874 £10,011 11.5 yrs £7,464
5 kW 5093 kWh 3565 kWh 1528 kWh £939 £153 £1,092 £11,639 10.7 yrs £10,205
6 kW 6112 kWh 4278 kWh 1833 kWh £1,127 £183 £1,311 £13,267 10.1 yrs £12,946
7 kW 7130 kWh 4991 kWh 2139 kWh £1,315 £214 £1,529 £14,894 9.7 yrs £15,687
8 kW 8149 kWh 5704 kWh 2445 kWh £1,503 £244 £1,748 £16,522 9.5 yrs £18,428

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: £1,117, Upfront: £13,389, Break-even: 12.0 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2037 kWh 1487 kWh 550 kWh £392 £55 £447 £8,506 19.0 yrs £432
3 kW 3056 kWh 2231 kWh 825 kWh £588 £83 £670 £10,133 15.1 yrs £3,273
4 kW 4074 kWh 2974 kWh 1100 kWh £784 £110 £894 £11,761 13.2 yrs £6,114
5 kW 5093 kWh 3718 kWh 1375 kWh £980 £138 £1,117 £13,389 12.0 yrs £8,955
6 kW 6112 kWh 4461 kWh 1650 kWh £1,176 £165 £1,341 £15,017 11.2 yrs £11,796
7 kW 7130 kWh 5205 kWh 1925 kWh £1,372 £193 £1,564 £16,644 10.6 yrs £14,637
8 kW 8149 kWh 5949 kWh 2200 kWh £1,567 £220 £1,787 £18,272 10.2 yrs £17,478

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: £1,134, 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 2037 kWh 1528 kWh 509 kWh £403 £51 £454 £10,256 22.6 yrs £-1,185
3 kW 3056 kWh 2292 kWh 764 kWh £604 £76 £680 £11,883 17.5 yrs £1,723
4 kW 4074 kWh 3056 kWh 1019 kWh £805 £102 £907 £13,511 14.9 yrs £4,630
5 kW 5093 kWh 3820 kWh 1273 kWh £1,007 £127 £1,134 £15,139 13.4 yrs £7,538
6 kW 6112 kWh 4584 kWh 1528 kWh £1,208 £153 £1,361 £16,767 12.3 yrs £10,445
7 kW 7130 kWh 5348 kWh 1783 kWh £1,409 £178 £1,587 £18,394 11.6 yrs £13,353
8 kW 8149 kWh 6112 kWh 2037 kWh £1,610 £204 £1,814 £20,022 11.0 yrs £16,260

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: £1,150, Upfront: £17,589, Break-even: 15.3 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2037 kWh 1569 kWh 469 kWh £413 £47 £460 £12,706 27.6 yrs £-3,502
3 kW 3056 kWh 2353 kWh 703 kWh £620 £70 £690 £14,333 20.8 yrs £-527
4 kW 4074 kWh 3137 kWh 937 kWh £827 £94 £920 £15,961 17.3 yrs £2,447
5 kW 5093 kWh 3922 kWh 1171 kWh £1,033 £117 £1,150 £17,589 15.3 yrs £5,421
6 kW 6112 kWh 4706 kWh 1406 kWh £1,240 £141 £1,381 £19,217 13.9 yrs £8,395
7 kW 7130 kWh 5490 kWh 1640 kWh £1,447 £164 £1,611 £20,844 12.9 yrs £11,369
8 kW 8149 kWh 6275 kWh 1874 kWh £1,653 £187 £1,841 £22,472 12.2 yrs £14,343

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 Bexley

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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Understand DNO, G98 and G99 export limits

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Insights for DA8

Figures below are tailored to DA8 — click through for full league tables.

Big-Roof Britain Rank #1978 of 2182
4.2 kWp (UK avg 5.1 kWp)
~9 panels (≈430 W)
Solar Payback Index Rank #457 of 2996
9.7 years (UK avg 10.8 years)
~£843 /yr • £8,139 upfront
Standing-Charge Drag Rank #354 of 2996
19.3% (UK avg 26.6%) drag on savings
£163 fixed • ~£843 /yr value
Aspect Penalty View ranking →
East −21.6% West −20.3%
Typical output loss versus a south-facing roof (lower is better)

Seasonal solar output in DA8

Monthly generation per kilowatt of solar panels

kWh 40 Jan 52 Feb 85 Mar 113 Apr 121 May 122 Jun 125 Jul 112 Aug 96 Sep 69 Oct 47 Nov 36 Dec
Best month Worst month Winter (Dec–Feb) Other months

Winter output: 50.3% 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 43 kWh per month; the average month produces around 85 kWh. So a typical 4 kW home system would generate roughly 171 kWh in winter, or 340 kWh in an average month.

Your Area at a Glance

Your Electricity Rate
26.35p/kWh
Daily Fixed Charge
44.78p/day
Local Sunshine
1019kWh/kW
A 1 kW system generates ~1019 kWh per year. A typical home uses ~2,700 kWh per year.
Typical System Size
5.0kW
For houses & bungalows in this area

Local Property Data

Property Types

Houses: 48% • Flats: 46% • Bungalows: 4% Based on 14,162 properties

Coverage

Bexley (100%)

Areas Covered

Slade Green & Northend, Erith, Northumberland Heath, Barnehurst, Belvedere, Bexleyheath

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

DA17 (Bexley)
≈2.6 km away
Local sunshine: ~1,014 kWh/kWp · -0% vs DA8
DA7 (Bexley)
≈3.4 km away
Local sunshine: ~1,016 kWh/kWp · -0% vs DA8
DA18 (Bexley)
≈3.7 km away
Local sunshine: ~1,017 kWh/kWp · -0% vs DA8
DA6 (Bexley)
≈3.8 km away
Local sunshine: ~1,016 kWh/kWp · -0% vs DA8
DA1 (Dartford)
≈4.1 km away
Local sunshine: ~1,022 kWh/kWp · +0% vs DA8
DA5 (Bexley)
≈4.4 km away
Local sunshine: ~1,020 kWh/kWp · +0% vs DA8

Similar sunshine across the UK

NR26 (North Norfolk)
~1,019 kWh/kWp · -0% vs DA8
RM3 (Havering)
~1,019 kWh/kWp · +0% vs DA8
SO20 (Test Valley)
~1,019 kWh/kWp · +0% vs DA8