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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in DA17 (Bexley)

See if solar pays off for you in Bexley — 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
12.3 years
After this, it's pure profit
Upfront Cost
£10,173
What you pay to get started
Annual Benefit
£824
What you save every year
Profit Over 25 Years
£10,434
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 1014 kWh/kW — 24 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 1014 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)
1014 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: £824, Upfront: £10,173, 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 2029 kWh 811 kWh 1217 kWh £208 £122 £330 £4,069 12.3 yrs £2,525
3 kW 3043 kWh 1217 kWh 1826 kWh £312 £183 £495 £6,104 12.3 yrs £3,788
4 kW 4057 kWh 1623 kWh 2434 kWh £416 £243 £659 £8,138 12.3 yrs £5,050
5 kW 5072 kWh 2029 kWh 3043 kWh £520 £304 £824 £10,173 12.3 yrs £6,313
6 kW 6086 kWh 2434 kWh 3652 kWh £624 £365 £989 £12,207 12.3 yrs £7,576
7 kW 7101 kWh 2840 kWh 4260 kWh £728 £426 £1,154 £14,242 12.3 yrs £8,838
8 kW 8115 kWh 3246 kWh 4869 kWh £832 £487 £1,319 £16,276 12.3 yrs £10,101

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: £983, 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 2029 kWh 1217 kWh 811 kWh £312 £81 £393 £6,169 15.7 yrs £1,694
3 kW 3043 kWh 1826 kWh 1217 kWh £468 £122 £590 £8,204 13.9 yrs £3,590
4 kW 4057 kWh 2434 kWh 1623 kWh £624 £162 £786 £10,238 13.0 yrs £5,487
5 kW 5072 kWh 3043 kWh 2029 kWh £780 £203 £983 £12,273 12.5 yrs £7,384
6 kW 6086 kWh 3652 kWh 2434 kWh £936 £243 £1,179 £14,307 12.1 yrs £9,281
7 kW 7101 kWh 4260 kWh 2840 kWh £1,092 £284 £1,376 £16,342 11.9 yrs £11,177
8 kW 8115 kWh 4869 kWh 3246 kWh £1,248 £325 £1,573 £18,376 11.7 yrs £13,074

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: £1,062, 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 2029 kWh 1420 kWh 609 kWh £364 £61 £425 £7,569 17.8 yrs £928
3 kW 3043 kWh 2130 kWh 913 kWh £546 £91 £637 £9,604 15.1 yrs £3,142
4 kW 4057 kWh 2840 kWh 1217 kWh £728 £122 £850 £11,638 13.7 yrs £5,355
5 kW 5072 kWh 3550 kWh 1522 kWh £910 £152 £1,062 £13,673 12.9 yrs £7,569
6 kW 6086 kWh 4260 kWh 1826 kWh £1,092 £183 £1,275 £15,707 12.3 yrs £9,783
7 kW 7101 kWh 4970 kWh 2130 kWh £1,274 £213 £1,487 £17,742 11.9 yrs £11,997
8 kW 8115 kWh 5680 kWh 2434 kWh £1,456 £243 £1,699 £19,776 11.6 yrs £14,211

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: £1,086, Upfront: £15,423, Break-even: 14.2 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2029 kWh 1481 kWh 548 kWh £380 £55 £434 £9,319 21.5 yrs £-632
3 kW 3043 kWh 2221 kWh 822 kWh £569 £82 £652 £11,354 17.4 yrs £1,677
4 kW 4057 kWh 2962 kWh 1096 kWh £759 £110 £869 £13,388 15.4 yrs £3,986
5 kW 5072 kWh 3702 kWh 1369 kWh £949 £137 £1,086 £15,423 14.2 yrs £6,295
6 kW 6086 kWh 4443 kWh 1643 kWh £1,139 £164 £1,303 £17,457 13.4 yrs £8,604
7 kW 7101 kWh 5183 kWh 1917 kWh £1,329 £192 £1,520 £19,492 12.8 yrs £10,913
8 kW 8115 kWh 5924 kWh 2191 kWh £1,518 £219 £1,737 £21,526 12.4 yrs £13,222

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: £1,102, Upfront: £17,173, Break-even: 15.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2029 kWh 1522 kWh 507 kWh £390 £51 £441 £11,069 25.1 yrs £-2,255
3 kW 3043 kWh 2282 kWh 761 kWh £585 £76 £661 £13,104 19.8 yrs £117
4 kW 4057 kWh 3043 kWh 1014 kWh £780 £101 £881 £15,138 17.2 yrs £2,490
5 kW 5072 kWh 3804 kWh 1268 kWh £975 £127 £1,102 £17,173 15.6 yrs £4,862
6 kW 6086 kWh 4565 kWh 1522 kWh £1,170 £152 £1,322 £19,207 14.5 yrs £7,235
7 kW 7101 kWh 5325 kWh 1775 kWh £1,365 £178 £1,542 £21,242 13.8 yrs £9,607
8 kW 8115 kWh 6086 kWh 2029 kWh £1,560 £203 £1,763 £23,276 13.2 yrs £11,979

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: £1,118, 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 2029 kWh 1562 kWh 467 kWh £400 £47 £447 £13,519 30.2 yrs £-4,578
3 kW 3043 kWh 2343 kWh 700 kWh £601 £70 £671 £15,554 23.2 yrs £-2,142
4 kW 4057 kWh 3124 kWh 933 kWh £801 £93 £894 £17,588 19.7 yrs £293
5 kW 5072 kWh 3905 kWh 1167 kWh £1,001 £117 £1,118 £19,623 17.6 yrs £2,729
6 kW 6086 kWh 4686 kWh 1400 kWh £1,201 £140 £1,341 £21,657 16.1 yrs £5,165
7 kW 7101 kWh 5467 kWh 1633 kWh £1,401 £163 £1,565 £23,692 15.1 yrs £7,601
8 kW 8115 kWh 6249 kWh 1866 kWh £1,601 £187 £1,788 £25,726 14.4 yrs £10,037

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 DA17

Figures below are tailored to DA17 — click through for full league tables.

Big-Roof Britain Rank #2073 of 2182
4.0 kWp (UK avg 5.1 kWp)
~8 panels (≈430 W)
Solar Payback Index Rank #931 of 2997
10.8 years (UK avg 11.3 years)
~£943 /yr • £10,173 upfront
Standing-Charge Drag Rank #934 of 2997
17.8% (UK avg 21.7%) drag on savings
£168 fixed • ~£943 /yr value

Your Area at a Glance

Your Electricity Rate
25.63p/kWh
Daily Fixed Charge
46.06p/day
Local Sunshine
1014kWh/kW
A 1 kW system generates ~1014 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: 42% • Flats: 41% • Bungalows: 3% Based on 6,605 properties

Coverage

Bexley (96%)|Dartford (4%)

Areas Covered

Belvedere, Erith, West Hill, Northumberland Heath, West Heath

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

DA18 (Bexley)
≈1.1 km away
Local sunshine: ~1,017 kWh/kWp · +0% vs DA17
SE2 (Greenwich)
≈2.3 km away
Local sunshine: ~1,016 kWh/kWp · +0% vs DA17
DA8 (Bexley)
≈2.6 km away
Local sunshine: ~1,019 kWh/kWp · +0% vs DA17
DA7 (Bexley)
≈3.0 km away
Local sunshine: ~1,016 kWh/kWp · +0% vs DA17
SE28 (Greenwich)
≈3.2 km away
Local sunshine: ~1,010 kWh/kWp · -0% vs DA17
DA6 (Bexley)
≈3.7 km away
Local sunshine: ~1,016 kWh/kWp · +0% vs DA17

Similar sunshine across the UK

RM5 (Havering)
~1,014 kWh/kWp · -0% vs DA17
SA68 (Pembrokeshire)
~1,014 kWh/kWp · -0% vs DA17
GU32 (East Hampshire)
~1,015 kWh/kWp · +0% vs DA17