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Solar panel cost in Dartford (DA1)

See realistic solar installation costs, savings and payback for DA1 (Dartford) 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
11.8 years
After this, it's pure profit
Upfront Cost
£8,138
What you pay to get started
Annual Benefit
£687
What you save every year
Profit Over 25 Years
£9,032
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 27.00p/kWh with a 47.11p/day standing charge. Your postcode’s south-facing sunshine yield is 1022 kWh/kW — 31 above the regional median (991).

Read the full story

A typical roof here lands around 4.0 kW, with most eligible homes comfortably fitting within 3–6 kW. Each kilowatt of panels produces roughly 1022 kWh per year on a south-facing roof. We value self-used electricity at 27.0p and exported surplus at a baseline 10p via SEG. Use the calculator above for your exact tariff.

Unit rate
27.0p/kWh
Standing charge
47.1p/day
Sunshine yield (south)
1022 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: £859, Upfront: £10,173, Break-even: 11.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2044 kWh 818 kWh 1226 kWh £221 £123 £343 £4,069 11.8 yrs £2,799
3 kW 3066 kWh 1226 kWh 1840 kWh £331 £184 £515 £6,104 11.8 yrs £4,199
4 kW 4088 kWh 1635 kWh 2453 kWh £442 £245 £687 £8,138 11.8 yrs £5,598
5 kW 5110 kWh 2044 kWh 3066 kWh £552 £307 £859 £10,173 11.8 yrs £6,998
6 kW 6132 kWh 2453 kWh 3679 kWh £662 £368 £1,030 £12,207 11.8 yrs £8,397
7 kW 7154 kWh 2862 kWh 4293 kWh £773 £429 £1,202 £14,242 11.8 yrs £9,797
8 kW 8176 kWh 3270 kWh 4906 kWh £883 £491 £1,374 £16,276 11.8 yrs £11,196

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: £1,032, Upfront: £12,273, Break-even: 11.9 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2044 kWh 1226 kWh 818 kWh £331 £82 £413 £6,169 14.9 yrs £2,089
3 kW 3066 kWh 1840 kWh 1226 kWh £497 £123 £619 £8,204 13.2 yrs £4,183
4 kW 4088 kWh 2453 kWh 1635 kWh £662 £164 £826 £10,238 12.4 yrs £6,278
5 kW 5110 kWh 3066 kWh 2044 kWh £828 £204 £1,032 £12,273 11.9 yrs £8,372
6 kW 6132 kWh 3679 kWh 2453 kWh £993 £245 £1,239 £14,307 11.6 yrs £10,467
7 kW 7154 kWh 4293 kWh 2862 kWh £1,159 £286 £1,445 £16,342 11.3 yrs £12,561
8 kW 8176 kWh 4906 kWh 3270 kWh £1,325 £327 £1,652 £18,376 11.1 yrs £14,656

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: £1,119, Upfront: £13,673, 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 2044 kWh 1431 kWh 613 kWh £386 £61 £448 £7,569 16.9 yrs £1,384
3 kW 3066 kWh 2146 kWh 920 kWh £579 £92 £671 £9,604 14.3 yrs £3,826
4 kW 4088 kWh 2862 kWh 1226 kWh £773 £123 £895 £11,638 13.0 yrs £6,268
5 kW 5110 kWh 3577 kWh 1533 kWh £966 £153 £1,119 £13,673 12.2 yrs £8,710
6 kW 6132 kWh 4293 kWh 1840 kWh £1,159 £184 £1,343 £15,707 11.7 yrs £11,152
7 kW 7154 kWh 5008 kWh 2146 kWh £1,352 £215 £1,567 £17,742 11.3 yrs £13,594
8 kW 8176 kWh 5723 kWh 2453 kWh £1,545 £245 £1,791 £19,776 11.0 yrs £16,036

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: £1,145, Upfront: £15,423, Break-even: 13.5 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2044 kWh 1492 kWh 552 kWh £403 £55 £458 £9,319 20.3 yrs £-158
3 kW 3066 kWh 2238 kWh 828 kWh £604 £83 £687 £11,354 16.5 yrs £2,389
4 kW 4088 kWh 2984 kWh 1104 kWh £806 £110 £916 £13,388 14.6 yrs £4,935
5 kW 5110 kWh 3730 kWh 1380 kWh £1,007 £138 £1,145 £15,423 13.5 yrs £7,481
6 kW 6132 kWh 4476 kWh 1656 kWh £1,209 £166 £1,374 £17,457 12.7 yrs £10,027
7 kW 7154 kWh 5223 kWh 1932 kWh £1,410 £193 £1,603 £19,492 12.2 yrs £12,574
8 kW 8176 kWh 5969 kWh 2208 kWh £1,612 £221 £1,832 £21,526 11.7 yrs £15,120

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: £1,163, Upfront: £17,173, Break-even: 14.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2044 kWh 1533 kWh 511 kWh £414 £51 £465 £11,069 23.8 yrs £-1,769
3 kW 3066 kWh 2300 kWh 767 kWh £621 £77 £698 £13,104 18.8 yrs £847
4 kW 4088 kWh 3066 kWh 1022 kWh £828 £102 £930 £15,138 16.3 yrs £3,463
5 kW 5110 kWh 3833 kWh 1278 kWh £1,035 £128 £1,163 £17,173 14.8 yrs £6,079
6 kW 6132 kWh 4599 kWh 1533 kWh £1,242 £153 £1,395 £19,207 13.8 yrs £8,694
7 kW 7154 kWh 5366 kWh 1789 kWh £1,449 £179 £1,628 £21,242 13.1 yrs £11,310
8 kW 8176 kWh 6132 kWh 2044 kWh £1,656 £204 £1,860 £23,276 12.5 yrs £13,926

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: £1,180, Upfront: £19,623, Break-even: 16.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2044 kWh 1574 kWh 470 kWh £425 £47 £472 £13,519 28.6 yrs £-4,080
3 kW 3066 kWh 2361 kWh 705 kWh £637 £71 £708 £15,554 22.0 yrs £-1,394
4 kW 4088 kWh 3148 kWh 940 kWh £850 £94 £944 £17,588 18.6 yrs £1,291
5 kW 5110 kWh 3935 kWh 1175 kWh £1,062 £118 £1,180 £19,623 16.6 yrs £3,976
6 kW 6132 kWh 4722 kWh 1410 kWh £1,275 £141 £1,416 £21,657 15.3 yrs £6,661
7 kW 7154 kWh 5509 kWh 1645 kWh £1,487 £165 £1,652 £23,692 14.3 yrs £9,347
8 kW 8176 kWh 6296 kWh 1881 kWh £1,700 £188 £1,888 £25,726 13.6 yrs £12,032

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 DA1

Figures below are tailored to DA1 — click through for full league tables.

Big-Roof Britain Rank #2014 of 2182
4.1 kWp (UK avg 5.1 kWp)
~9 panels (≈430 W)
Solar Payback Index Rank #621 of 2997
11.8 years (UK avg 12.6 years)
~£687 /yr • £8,138 upfront
Standing-Charge Drag Rank #1888 of 2997
25.0% (UK avg 24.6%) drag on savings
£172 fixed • ~£687 /yr value
Aspect Penalty View ranking →
East −21.5% West −20.2%
Typical output loss versus a south-facing roof (lower is better)

Your Area at a Glance

Your Electricity Rate
27.00p/kWh
Daily Fixed Charge
47.11p/day
Local Sunshine
1022kWh/kW
A 1 kW system generates ~1022 kWh per year. A typical home uses ~2,700 kWh per year.
Typical System Size
4.0kW
For houses & bungalows in this area

Local Property Data

Property Types

Houses: 60% • Flats: 34% • Bungalows: 2% Based on 16,806 properties

Coverage

Dartford (83%)|Bexley (17%)

Areas Covered

West Hill, Crayford, Town, Temple Hill, Princes, Heath, Newtown, Bridge + 5 more

Data Sources & Assumptions

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

Electricity rates: Ofgem price cap, Q1 2026

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

DA8 (Bexley)
≈4.1 km away
Local sunshine: ~1,019 kWh/kWp · -0% vs DA1
DA5 (Bexley)
≈4.2 km away
Local sunshine: ~1,020 kWh/kWp · -0% vs DA1
DA6 (Bexley)
≈5.2 km away
Local sunshine: ~1,016 kWh/kWp · -1% vs DA1
DA7 (Bexley)
≈5.5 km away
Local sunshine: ~1,016 kWh/kWp · -1% vs DA1
DA17 (Bexley)
≈6.5 km away
Local sunshine: ~1,014 kWh/kWp · -1% vs DA1
DA16 (Bexley)
≈7.3 km away
Local sunshine: ~1,016 kWh/kWp · -1% vs DA1

Similar sunshine across the UK

IP30 (Mid Suffolk)
~1,022 kWh/kWp · -0% vs DA1
SO5 (Eastleigh)
~1,022 kWh/kWp · +0% vs DA1
GU6 (Waverley)
~1,021 kWh/kWp · -0% vs DA1