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Solar panel cost in Kingston upon Thames (KT9)

See realistic solar installation costs, savings and payback for KT9 (Kingston upon Thames) 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
11.0 years
After this, it's pure profit
Upfront Cost
£7,307
What you pay to get started
Annual Benefit
£665
What you save every year
Profit Over 25 Years
£9,329
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 998 kWh/kW — 31 below the regional median (1029).

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 998 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)
998 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: £832, Upfront: £9,134, Break-even: 11.0 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1996 kWh 798 kWh 1198 kWh £213 £120 £333 £3,654 11.0 yrs £3,001
3 kW 2994 kWh 1198 kWh 1797 kWh £319 £180 £499 £5,481 11.0 yrs £4,501
4 kW 3992 kWh 1597 kWh 2395 kWh £426 £240 £665 £7,307 11.0 yrs £6,002
5 kW 4990 kWh 1996 kWh 2994 kWh £532 £299 £832 £9,134 11.0 yrs £7,502
6 kW 5989 kWh 2395 kWh 3593 kWh £639 £359 £998 £10,961 11.0 yrs £9,002
7 kW 6987 kWh 2795 kWh 4192 kWh £745 £419 £1,165 £12,788 11.0 yrs £10,503
8 kW 7985 kWh 3194 kWh 4791 kWh £852 £479 £1,331 £14,615 11.0 yrs £12,003

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: £998, Upfront: £11,234, Break-even: 11.3 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1996 kWh 1198 kWh 798 kWh £319 £80 £399 £5,754 14.4 yrs £2,232
3 kW 2994 kWh 1797 kWh 1198 kWh £479 £120 £599 £7,581 12.7 yrs £4,398
4 kW 3992 kWh 2395 kWh 1597 kWh £639 £160 £799 £9,407 11.8 yrs £6,564
5 kW 4990 kWh 2994 kWh 1996 kWh £799 £200 £998 £11,234 11.3 yrs £8,730
6 kW 5989 kWh 3593 kWh 2395 kWh £958 £240 £1,198 £13,061 10.9 yrs £10,896
7 kW 6987 kWh 4192 kWh 2795 kWh £1,118 £279 £1,397 £14,888 10.7 yrs £13,061
8 kW 7985 kWh 4791 kWh 3194 kWh £1,278 £319 £1,597 £16,715 10.5 yrs £15,227

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: £1,081, Upfront: £12,634, Break-even: 11.7 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1996 kWh 1397 kWh 599 kWh £373 £60 £433 £7,154 16.5 yrs £1,497
3 kW 2994 kWh 2096 kWh 898 kWh £559 £90 £649 £8,981 13.8 yrs £3,996
4 kW 3992 kWh 2795 kWh 1198 kWh £745 £120 £865 £10,807 12.5 yrs £6,495
5 kW 4990 kWh 3493 kWh 1497 kWh £932 £150 £1,081 £12,634 11.7 yrs £8,993
6 kW 5989 kWh 4192 kWh 1797 kWh £1,118 £180 £1,298 £14,461 11.1 yrs £11,492
7 kW 6987 kWh 4891 kWh 2096 kWh £1,304 £210 £1,514 £16,288 10.8 yrs £13,991
8 kW 7985 kWh 5589 kWh 2395 kWh £1,491 £240 £1,730 £18,115 10.5 yrs £16,489

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: £1,106, Upfront: £14,384, Break-even: 13.0 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1996 kWh 1457 kWh 539 kWh £389 £54 £443 £8,904 20.1 yrs £-53
3 kW 2994 kWh 2186 kWh 808 kWh £583 £81 £664 £10,731 16.2 yrs £2,546
4 kW 3992 kWh 2914 kWh 1078 kWh £777 £108 £885 £12,557 14.2 yrs £5,144
5 kW 4990 kWh 3643 kWh 1347 kWh £972 £135 £1,106 £14,384 13.0 yrs £7,743
6 kW 5989 kWh 4372 kWh 1617 kWh £1,166 £162 £1,328 £16,211 12.2 yrs £10,341
7 kW 6987 kWh 5100 kWh 1886 kWh £1,360 £189 £1,549 £18,038 11.6 yrs £12,940
8 kW 7985 kWh 5829 kWh 2156 kWh £1,555 £216 £1,770 £19,865 11.2 yrs £15,538

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: £1,123, Upfront: £16,134, Break-even: 14.4 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1996 kWh 1497 kWh 499 kWh £399 £50 £449 £10,654 23.7 yrs £-1,670
3 kW 2994 kWh 2246 kWh 749 kWh £599 £75 £674 £12,481 18.5 yrs £995
4 kW 3992 kWh 2994 kWh 998 kWh £799 £100 £898 £14,307 15.9 yrs £3,660
5 kW 4990 kWh 3743 kWh 1248 kWh £998 £125 £1,123 £16,134 14.4 yrs £6,325
6 kW 5989 kWh 4491 kWh 1497 kWh £1,198 £150 £1,348 £17,961 13.3 yrs £8,990
7 kW 6987 kWh 5240 kWh 1747 kWh £1,398 £175 £1,572 £19,788 12.6 yrs £11,655
8 kW 7985 kWh 5989 kWh 1996 kWh £1,597 £200 £1,797 £21,615 12.0 yrs £14,321

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: £1,140, Upfront: £18,584, Break-even: 16.3 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1996 kWh 1537 kWh 459 kWh £410 £46 £456 £13,104 28.7 yrs £-3,987
3 kW 2994 kWh 2306 kWh 689 kWh £615 £69 £684 £14,931 21.8 yrs £-1,255
4 kW 3992 kWh 3074 kWh 918 kWh £820 £92 £912 £16,757 18.4 yrs £1,476
5 kW 4990 kWh 3843 kWh 1148 kWh £1,025 £115 £1,140 £18,584 16.3 yrs £4,208
6 kW 5989 kWh 4611 kWh 1377 kWh £1,230 £138 £1,368 £20,411 14.9 yrs £6,940
7 kW 6987 kWh 5380 kWh 1607 kWh £1,435 £161 £1,595 £22,238 13.9 yrs £9,671
8 kW 7985 kWh 6148 kWh 1836 kWh £1,640 £184 £1,823 £24,065 13.2 yrs £12,403

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 Kingston upon Thames

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 KT9

Figures below are tailored to KT9 — click through for full league tables.

Big-Roof Britain Rank #1812 of 2182
4.4 kWp (UK avg 5.1 kWp)
~9 panels (≈430 W)
Solar Payback Index Rank #1977 of 2996
11.0 years (UK avg 10.8 years)
~£665 /yr • £7,307 upfront
Standing-Charge Drag Rank #2135 of 2996
29.9% (UK avg 26.6%) drag on savings
£199 fixed • ~£665 /yr value
Aspect Penalty View ranking →
East −21.3% West −19.5%
Typical output loss versus a south-facing roof (lower is better)

Seasonal solar output in KT9

Monthly generation per kilowatt of solar panels

kWh 39 Jan 51 Feb 84 Mar 112 Apr 119 May 121 Jun 122 Jul 109 Aug 93 Sep 68 Oct 46 Nov 34 Dec
Best month Worst month Winter (Dec–Feb) Other months

Winter output: 49.7% 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 41 kWh per month; the average month produces around 83 kWh. So a typical 4 kW home system would generate roughly 165 kWh in winter, or 333 kWh in an average month.

Your Area at a Glance

Your Electricity Rate
26.67p/kWh
Daily Fixed Charge
54.45p/day
Local Sunshine
998kWh/kW
A 1 kW system generates ~998 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: 66% • Flats: 25% • Bungalows: 3% Based on 4,894 properties

Coverage

Kingston upon Thames (99%)|Elmbridge (1%)

Areas Covered

Hook & Chessington North, Chessington South & Malden Rushett, King George's & Sunray, Hinchley Wood and Weston Green

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

KT6 (Kingston upon Thames)
≈2.5 km away
Local sunshine: ~998 kWh/kWp · +0% vs KT9
KT5 (Kingston upon Thames)
≈2.9 km away
Local sunshine: ~997 kWh/kWp · -0% vs KT9
KT7 (Elmbridge)
≈3.1 km away
Local sunshine: ~998 kWh/kWp · +0% vs KT9
KT19 (Epsom and Ewell)
≈3.3 km away
Local sunshine: ~996 kWh/kWp · -0% vs KT9
KT10 (Elmbridge)
≈4.0 km away
Local sunshine: ~998 kWh/kWp · +0% vs KT9
KT1 (Kingston upon Thames)
≈4.4 km away
Local sunshine: ~997 kWh/kWp · -0% vs KT9

Similar sunshine across the UK

FY5 (Wyre)
~998 kWh/kWp · +0% vs KT9
EX6 (Teignbridge)
~998 kWh/kWp · +0% vs KT9
SL1 (Slough)
~998 kWh/kWp · +0% vs KT9