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Solar panel cost in Dartford (DA2)

See realistic solar installation costs, savings and payback for DA2 (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
9.5 years
After this, it's pure profit
Upfront Cost
£8,139
What you pay to get started
Annual Benefit
£854
What you save every year
Profit Over 25 Years
£13,201
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 South East, the current unit rate is 26.67p/kWh with a 54.45p/day standing charge. Your postcode’s south-facing sunshine yield is 1024 kWh/kW — 5 below the regional median (1029).

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 1024 kWh per year on a south-facing roof. We value self-used electricity at 26.7p and exported surplus at a baseline 10p via SEG. Use the calculator above for your exact tariff.

Unit rate
26.7p/kWh
Standing charge
54.5p/day
Sunshine yield (south)
1024 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: £854, Upfront: £8,139, Break-even: 9.5 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2048 kWh 819 kWh 1229 kWh £219 £123 £341 £3,256 9.5 yrs £3,573
3 kW 3073 kWh 1229 kWh 1844 kWh £328 £184 £512 £4,883 9.5 yrs £5,360
4 kW 4097 kWh 1639 kWh 2458 kWh £437 £246 £683 £6,511 9.5 yrs £7,146
5 kW 5121 kWh 2048 kWh 3073 kWh £546 £307 £854 £8,139 9.5 yrs £8,933
6 kW 6145 kWh 2458 kWh 3687 kWh £656 £369 £1,024 £9,767 9.5 yrs £10,720
7 kW 7170 kWh 2868 kWh 4302 kWh £765 £430 £1,195 £11,394 9.5 yrs £12,506
8 kW 8194 kWh 3278 kWh 4916 kWh £874 £492 £1,366 £13,022 9.5 yrs £14,293

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: £1,024, Upfront: £10,239, Break-even: 10.0 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2048 kWh 1229 kWh 819 kWh £328 £82 £410 £5,356 13.1 yrs £2,839
3 kW 3073 kWh 1844 kWh 1229 kWh £492 £123 £615 £6,983 11.4 yrs £5,309
4 kW 4097 kWh 2458 kWh 1639 kWh £656 £164 £819 £8,611 10.5 yrs £7,778
5 kW 5121 kWh 3073 kWh 2048 kWh £819 £205 £1,024 £10,239 10.0 yrs £10,248
6 kW 6145 kWh 3687 kWh 2458 kWh £983 £246 £1,229 £11,867 9.7 yrs £12,717
7 kW 7170 kWh 4302 kWh 2868 kWh £1,147 £287 £1,434 £13,494 9.4 yrs £15,187
8 kW 8194 kWh 4916 kWh 3278 kWh £1,311 £328 £1,639 £15,122 9.2 yrs £17,657

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: £1,110, Upfront: £11,639, Break-even: 10.5 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2048 kWh 1434 kWh 615 kWh £382 £61 £444 £6,756 15.2 yrs £2,122
3 kW 3073 kWh 2151 kWh 922 kWh £574 £92 £666 £8,383 12.6 yrs £4,933
4 kW 4097 kWh 2868 kWh 1229 kWh £765 £123 £888 £10,011 11.3 yrs £7,744
5 kW 5121 kWh 3585 kWh 1536 kWh £956 £154 £1,110 £11,639 10.5 yrs £10,555
6 kW 6145 kWh 4302 kWh 1844 kWh £1,147 £184 £1,332 £13,267 10.0 yrs £13,366
7 kW 7170 kWh 5019 kWh 2151 kWh £1,338 £215 £1,554 £14,894 9.6 yrs £16,177
8 kW 8194 kWh 5736 kWh 2458 kWh £1,530 £246 £1,776 £16,522 9.3 yrs £18,988

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: £1,135, Upfront: £13,389, 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 2048 kWh 1495 kWh 553 kWh £399 £55 £454 £8,506 18.7 yrs £577
3 kW 3073 kWh 2243 kWh 830 kWh £598 £83 £681 £10,133 14.9 yrs £3,490
4 kW 4097 kWh 2991 kWh 1106 kWh £798 £111 £908 £11,761 12.9 yrs £6,404
5 kW 5121 kWh 3738 kWh 1383 kWh £997 £138 £1,135 £13,389 11.8 yrs £9,317
6 kW 6145 kWh 4486 kWh 1659 kWh £1,196 £166 £1,362 £15,017 11.0 yrs £12,231
7 kW 7170 kWh 5234 kWh 1936 kWh £1,396 £194 £1,589 £16,644 10.5 yrs £15,144
8 kW 8194 kWh 5982 kWh 2212 kWh £1,595 £221 £1,817 £18,272 10.1 yrs £18,058

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: £1,152, Upfront: £15,139, Break-even: 13.1 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2048 kWh 1536 kWh 512 kWh £410 £51 £461 £10,256 22.2 yrs £-1,036
3 kW 3073 kWh 2305 kWh 768 kWh £615 £77 £691 £11,883 17.2 yrs £1,945
4 kW 4097 kWh 3073 kWh 1024 kWh £819 £102 £922 £13,511 14.7 yrs £4,927
5 kW 5121 kWh 3841 kWh 1280 kWh £1,024 £128 £1,152 £15,139 13.1 yrs £7,909
6 kW 6145 kWh 4609 kWh 1536 kWh £1,229 £154 £1,383 £16,767 12.1 yrs £10,891
7 kW 7170 kWh 5377 kWh 1792 kWh £1,434 £179 £1,613 £18,394 11.4 yrs £13,873
8 kW 8194 kWh 6145 kWh 2048 kWh £1,639 £205 £1,844 £20,022 10.9 yrs £16,854

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: £1,169, Upfront: £17,589, Break-even: 15.0 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2048 kWh 1577 kWh 471 kWh £421 £47 £468 £12,706 27.2 yrs £-3,350
3 kW 3073 kWh 2366 kWh 707 kWh £631 £71 £702 £14,333 20.4 yrs £-300
4 kW 4097 kWh 3155 kWh 942 kWh £841 £94 £936 £15,961 17.1 yrs £2,750
5 kW 5121 kWh 3943 kWh 1178 kWh £1,052 £118 £1,169 £17,589 15.0 yrs £5,800
6 kW 6145 kWh 4732 kWh 1413 kWh £1,262 £141 £1,403 £19,217 13.7 yrs £8,850
7 kW 7170 kWh 5521 kWh 1649 kWh £1,472 £165 £1,637 £20,844 12.7 yrs £11,901
8 kW 8194 kWh 6309 kWh 1885 kWh £1,683 £188 £1,871 £22,472 12.0 yrs £14,951

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 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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Insights for DA2

Figures below are tailored to DA2 — click through for full league tables.

Big-Roof Britain Rank #1344 of 2182
4.8 kWp (UK avg 5.1 kWp)
~10 panels (≈430 W)
Solar Payback Index Rank #283 of 2996
9.5 years (UK avg 10.8 years)
~£853 /yr • £8,139 upfront
Standing-Charge Drag Rank #1050 of 2996
23.3% (UK avg 26.6%) drag on savings
£199 fixed • ~£853 /yr value
Aspect Penalty View ranking →
East −21.2% West −20.4%
Typical output loss versus a south-facing roof (lower is better)

Seasonal solar output in DA2

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 36 Dec
Best month Worst month Winter (Dec–Feb) Other months

Winter output: 49.5% 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 169 kWh in winter, or 341 kWh in an average month.

Your Area at a Glance

Your Electricity Rate
26.67p/kWh
Daily Fixed Charge
54.45p/day
Local Sunshine
1024kWh/kW
A 1 kW system generates ~1024 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: 68% • Flats: 21% • Bungalows: 10% Based on 5,200 properties

Coverage

Dartford (100%)

Areas Covered

Stone House, Wilmington, Sutton-at-Hone & Hawley, Bean & Village Park, Darenth, West Hill, Maypole & Leyton Cross, Brent + 6 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 South East

DA9 (Dartford)
≈3.1 km away
Local sunshine: ~1,025 kWh/kWp · +0% vs DA2
DA4 (Sevenoaks)
≈4.4 km away
Local sunshine: ~1,015 kWh/kWp · -1% vs DA2
DA10 (Dartford)
≈4.6 km away
Local sunshine: ~1,027 kWh/kWp · +0% vs DA2
BR8 (Sevenoaks)
≈6.2 km away
Local sunshine: ~1,010 kWh/kWp · -1% vs DA2
DA3 (Sevenoaks)
≈6.6 km away
Local sunshine: ~1,025 kWh/kWp · +0% vs DA2
DA11 (Gravesham)
≈7.8 km away
Local sunshine: ~1,028 kWh/kWp · +0% vs DA2

Similar sunshine across the UK

CM14 (Brentwood)
~1,024 kWh/kWp · +0% vs DA2
TA5 (Somerset)
~1,024 kWh/kWp · +0% vs DA2
CF5 (Cardiff)
~1,024 kWh/kWp · -0% vs DA2