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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
10.8 years
After this, it's pure profit
Upfront Cost
£7,307
What you pay to get started
Annual Benefit
£676
What you save every year
Profit Over 25 Years
£9,597
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 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 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)
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: £845, Upfront: £9,134, Break-even: 10.8 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 £215 £123 £338 £3,654 10.8 yrs £3,108
3 kW 3066 kWh 1226 kWh 1840 kWh £323 £184 £507 £5,481 10.8 yrs £4,662
4 kW 4088 kWh 1635 kWh 2453 kWh £431 £245 £676 £7,307 10.8 yrs £6,216
5 kW 5110 kWh 2044 kWh 3066 kWh £539 £307 £845 £9,134 10.8 yrs £7,770
6 kW 6132 kWh 2453 kWh 3679 kWh £646 £368 £1,014 £10,961 10.8 yrs £9,324
7 kW 7154 kWh 2862 kWh 4293 kWh £754 £429 £1,183 £12,788 10.8 yrs £10,878
8 kW 8176 kWh 3270 kWh 4906 kWh £862 £491 £1,352 £14,615 10.8 yrs £12,432

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,827, battery £/kWh = 700.

3 kWh battery 5 kW example → Annual benefit: £1,012, Upfront: £11,234, Break-even: 11.1 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 £323 £82 £405 £5,754 14.2 yrs £2,345
3 kW 3066 kWh 1840 kWh 1226 kWh £485 £123 £607 £7,581 12.5 yrs £4,567
4 kW 4088 kWh 2453 kWh 1635 kWh £646 £164 £810 £9,407 11.6 yrs £6,790
5 kW 5110 kWh 3066 kWh 2044 kWh £808 £204 £1,012 £11,234 11.1 yrs £9,012
6 kW 6132 kWh 3679 kWh 2453 kWh £969 £245 £1,215 £13,061 10.8 yrs £11,235
7 kW 7154 kWh 4293 kWh 2862 kWh £1,131 £286 £1,417 £14,888 10.5 yrs £13,457
8 kW 8176 kWh 4906 kWh 3270 kWh £1,293 £327 £1,620 £16,715 10.3 yrs £15,680

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,827, battery £/kWh = 700.

5 kWh battery 5 kW example → Annual benefit: £1,096, Upfront: £12,634, Break-even: 11.5 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2044 kWh 1431 kWh 613 kWh £377 £61 £438 £7,154 16.3 yrs £1,613
3 kW 3066 kWh 2146 kWh 920 kWh £566 £92 £658 £8,981 13.7 yrs £4,170
4 kW 4088 kWh 2862 kWh 1226 kWh £754 £123 £877 £10,807 12.3 yrs £6,727
5 kW 5110 kWh 3577 kWh 1533 kWh £943 £153 £1,096 £12,634 11.5 yrs £9,283
6 kW 6132 kWh 4293 kWh 1840 kWh £1,131 £184 £1,315 £14,461 11.0 yrs £11,840
7 kW 7154 kWh 5008 kWh 2146 kWh £1,320 £215 £1,534 £16,288 10.6 yrs £14,397
8 kW 8176 kWh 5723 kWh 2453 kWh £1,508 £245 £1,753 £18,115 10.3 yrs £16,953

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,827, battery £/kWh = 700.

7.5 kWh battery 5 kW example → Annual benefit: £1,121, Upfront: £14,384, Break-even: 12.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2044 kWh 1492 kWh 552 kWh £393 £55 £448 £8,904 19.9 yrs £64
3 kW 3066 kWh 2238 kWh 828 kWh £590 £83 £673 £10,731 16.0 yrs £2,721
4 kW 4088 kWh 2984 kWh 1104 kWh £786 £110 £897 £12,557 14.0 yrs £5,378
5 kW 5110 kWh 3730 kWh 1380 kWh £983 £138 £1,121 £14,384 12.8 yrs £8,035
6 kW 6132 kWh 4476 kWh 1656 kWh £1,180 £166 £1,345 £16,211 12.1 yrs £10,691
7 kW 7154 kWh 5223 kWh 1932 kWh £1,376 £193 £1,569 £18,038 11.5 yrs £13,348
8 kW 8176 kWh 5969 kWh 2208 kWh £1,573 £221 £1,793 £19,865 11.1 yrs £16,005

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,827, battery £/kWh = 700.

10 kWh battery 5 kW example → Annual benefit: £1,138, Upfront: £16,134, 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 2044 kWh 1533 kWh 511 kWh £404 £51 £455 £10,654 23.4 yrs £-1,553
3 kW 3066 kWh 2300 kWh 767 kWh £606 £77 £683 £12,481 18.3 yrs £1,171
4 kW 4088 kWh 3066 kWh 1022 kWh £808 £102 £910 £14,307 15.7 yrs £3,895
5 kW 5110 kWh 3833 kWh 1278 kWh £1,010 £128 £1,138 £16,134 14.2 yrs £6,619
6 kW 6132 kWh 4599 kWh 1533 kWh £1,212 £153 £1,365 £17,961 13.2 yrs £9,342
7 kW 7154 kWh 5366 kWh 1789 kWh £1,414 £179 £1,593 £19,788 12.4 yrs £12,066
8 kW 8176 kWh 6132 kWh 2044 kWh £1,616 £204 £1,820 £21,615 11.9 yrs £14,790

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,827, battery £/kWh = 700.

13.5 kWh battery 5 kW example → Annual benefit: £1,154, Upfront: £18,584, Break-even: 16.1 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 £415 £47 £462 £13,104 28.4 yrs £-3,869
3 kW 3066 kWh 2361 kWh 705 kWh £622 £71 £693 £14,931 21.6 yrs £-1,078
4 kW 4088 kWh 3148 kWh 940 kWh £829 £94 £923 £16,757 18.1 yrs £1,712
5 kW 5110 kWh 3935 kWh 1175 kWh £1,037 £118 £1,154 £18,584 16.1 yrs £4,503
6 kW 6132 kWh 4722 kWh 1410 kWh £1,244 £141 £1,385 £20,411 14.7 yrs £7,294
7 kW 7154 kWh 5509 kWh 1645 kWh £1,452 £165 £1,616 £22,238 13.8 yrs £10,084
8 kW 8176 kWh 6296 kWh 1881 kWh £1,659 £188 £1,847 £24,065 13.0 yrs £12,875

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,827, 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 Dartford

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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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 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 #1780 of 2996
10.8 years (UK avg 10.8 years)
~£676 /yr • £7,307 upfront
Standing-Charge Drag Rank #1249 of 2996
24.1% (UK avg 26.6%) drag on savings
£163 fixed • ~£676 /yr value
Aspect Penalty View ranking →
East −21.5% West −20.2%
Typical output loss versus a south-facing roof (lower is better)

Seasonal solar output in DA1

Monthly generation per kilowatt of solar panels

kWh 39 Jan 52 Feb 85 Mar 114 Apr 122 May 124 Jun 125 Jul 113 Aug 96 Sep 70 Oct 47 Nov 34 Dec
Best month Worst month Winter (Dec–Feb) Other months

Winter output: 49.0% 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 85 kWh. So a typical 4 kW home system would generate roughly 167 kWh in winter, or 341 kWh in an average month.

Your Area at a Glance

Your Electricity Rate
26.35p/kWh
Daily Fixed Charge
44.78p/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, 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

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