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Solar panel cost in Kingston upon Thames (KT5)

See realistic solar installation costs, savings and payback for KT5 (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
9.8 years
After this, it's pure profit
Upfront Cost
£8,139
What you pay to get started
Annual Benefit
£831
What you save every year
Profit Over 25 Years
£12,633
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 997 kWh/kW — 32 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 997 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)
997 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: £831, Upfront: £8,139, Break-even: 9.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1994 kWh 798 kWh 1196 kWh £213 £120 £332 £3,256 9.8 yrs £3,391
3 kW 2991 kWh 1196 kWh 1795 kWh £319 £179 £499 £4,883 9.8 yrs £5,087
4 kW 3988 kWh 1595 kWh 2393 kWh £425 £239 £665 £6,511 9.8 yrs £6,783
5 kW 4985 kWh 1994 kWh 2991 kWh £532 £299 £831 £8,139 9.8 yrs £8,479
6 kW 5982 kWh 2393 kWh 3589 kWh £638 £359 £997 £9,767 9.8 yrs £10,174
7 kW 6979 kWh 2791 kWh 4187 kWh £744 £419 £1,163 £11,394 9.8 yrs £11,870
8 kW 7976 kWh 3190 kWh 4785 kWh £851 £479 £1,329 £13,022 9.8 yrs £13,566

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: £997, Upfront: £10,239, Break-even: 10.3 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1994 kWh 1196 kWh 798 kWh £319 £80 £399 £5,356 13.4 yrs £2,621
3 kW 2991 kWh 1795 kWh 1196 kWh £479 £120 £598 £6,983 11.7 yrs £4,981
4 kW 3988 kWh 2393 kWh 1595 kWh £638 £160 £798 £8,611 10.8 yrs £7,342
5 kW 4985 kWh 2991 kWh 1994 kWh £798 £199 £997 £10,239 10.3 yrs £9,702
6 kW 5982 kWh 3589 kWh 2393 kWh £957 £239 £1,196 £11,867 9.9 yrs £12,063
7 kW 6979 kWh 4187 kWh 2791 kWh £1,117 £279 £1,396 £13,494 9.7 yrs £14,423
8 kW 7976 kWh 4785 kWh 3190 kWh £1,276 £319 £1,595 £15,122 9.5 yrs £16,784

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: £1,080, Upfront: £11,639, 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 1994 kWh 1396 kWh 598 kWh £372 £60 £432 £6,756 15.6 yrs £1,886
3 kW 2991 kWh 2094 kWh 897 kWh £558 £90 £648 £8,383 12.9 yrs £4,579
4 kW 3988 kWh 2791 kWh 1196 kWh £744 £120 £864 £10,011 11.6 yrs £7,271
5 kW 4985 kWh 3489 kWh 1495 kWh £931 £150 £1,080 £11,639 10.8 yrs £9,964
6 kW 5982 kWh 4187 kWh 1795 kWh £1,117 £179 £1,296 £13,267 10.2 yrs £12,657
7 kW 6979 kWh 4885 kWh 2094 kWh £1,303 £209 £1,512 £14,894 9.8 yrs £15,350
8 kW 7976 kWh 5583 kWh 2393 kWh £1,489 £239 £1,728 £16,522 9.6 yrs £18,043

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: £1,105, Upfront: £13,389, Break-even: 12.1 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1994 kWh 1456 kWh 538 kWh £388 £54 £442 £8,506 19.2 yrs £335
3 kW 2991 kWh 2183 kWh 808 kWh £582 £81 £663 £10,133 15.3 yrs £3,128
4 kW 3988 kWh 2911 kWh 1077 kWh £776 £108 £884 £11,761 13.3 yrs £5,920
5 kW 4985 kWh 3639 kWh 1346 kWh £970 £135 £1,105 £13,389 12.1 yrs £8,713
6 kW 5982 kWh 4367 kWh 1615 kWh £1,165 £162 £1,326 £15,017 11.3 yrs £11,505
7 kW 6979 kWh 5094 kWh 1884 kWh £1,359 £188 £1,547 £16,644 10.8 yrs £14,298
8 kW 7976 kWh 5822 kWh 2153 kWh £1,553 £215 £1,768 £18,272 10.3 yrs £17,091

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: £1,122, Upfront: £15,139, 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 1994 kWh 1495 kWh 498 kWh £399 £50 £449 £10,256 22.9 yrs £-1,282
3 kW 2991 kWh 2243 kWh 748 kWh £598 £75 £673 £11,883 17.7 yrs £1,577
4 kW 3988 kWh 2991 kWh 997 kWh £798 £100 £897 £13,511 15.1 yrs £4,436
5 kW 4985 kWh 3739 kWh 1246 kWh £997 £125 £1,122 £15,139 13.5 yrs £7,295
6 kW 5982 kWh 4486 kWh 1495 kWh £1,197 £150 £1,346 £16,767 12.5 yrs £10,154
7 kW 6979 kWh 5234 kWh 1745 kWh £1,396 £174 £1,570 £18,394 11.7 yrs £13,013
8 kW 7976 kWh 5982 kWh 1994 kWh £1,595 £199 £1,795 £20,022 11.2 yrs £15,872

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: £1,138, Upfront: £17,589, Break-even: 15.5 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1994 kWh 1535 kWh 459 kWh £409 £46 £455 £12,706 27.9 yrs £-3,599
3 kW 2991 kWh 2303 kWh 688 kWh £614 £69 £683 £14,333 21.0 yrs £-673
4 kW 3988 kWh 3071 kWh 917 kWh £819 £92 £911 £15,961 17.5 yrs £2,252
5 kW 4985 kWh 3838 kWh 1147 kWh £1,024 £115 £1,138 £17,589 15.5 yrs £5,178
6 kW 5982 kWh 4606 kWh 1376 kWh £1,228 £138 £1,366 £19,217 14.1 yrs £8,103
7 kW 6979 kWh 5374 kWh 1605 kWh £1,433 £161 £1,594 £20,844 13.1 yrs £11,029
8 kW 7976 kWh 6141 kWh 1834 kWh £1,638 £183 £1,821 £22,472 12.3 yrs £13,954

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 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 KT5

Figures below are tailored to KT5 — click through for full league tables.

Big-Roof Britain Rank #1956 of 2182
4.2 kWp (UK avg 5.1 kWp)
~9 panels (≈430 W)
Solar Payback Index Rank #644 of 2996
9.8 years (UK avg 10.8 years)
~£831 /yr • £8,139 upfront
Standing-Charge Drag Rank #1181 of 2996
23.9% (UK avg 26.6%) drag on savings
£199 fixed • ~£831 /yr value
Aspect Penalty View ranking →
East −21.3% West −19.4%
Typical output loss versus a south-facing roof (lower is better)

Seasonal solar output in KT5

Monthly generation per kilowatt of solar panels

kWh 38 Jan 51 Feb 84 Mar 112 Apr 119 May 121 Jun 122 Jul 109 Aug 93 Sep 67 Oct 46 Nov 34 Dec
Best month Worst month Winter (Dec–Feb) Other months

Winter output: 49.6% 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 332 kWh in an average month.

Your Area at a Glance

Your Electricity Rate
26.67p/kWh
Daily Fixed Charge
54.45p/day
Local Sunshine
997kWh/kW
A 1 kW system generates ~997 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: 43% • Flats: 50% • Bungalows: 3% Based on 5,986 properties

Coverage

Kingston upon Thames (100%)

Areas Covered

Berrylands, Alexandra, Norbiton, Surbiton Hill, King George's & Sunray, St Mark's & Seething Wells

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)
≈0.7 km away
Local sunshine: ~998 kWh/kWp · +0% vs KT5
KT1 (Kingston upon Thames)
≈1.5 km away
Local sunshine: ~997 kWh/kWp · +0% vs KT5
KT2 (Kingston upon Thames)
≈2.7 km away
Local sunshine: ~997 kWh/kWp · +0% vs KT5
KT7 (Elmbridge)
≈2.9 km away
Local sunshine: ~998 kWh/kWp · +0% vs KT5
KT9 (Kingston upon Thames)
≈2.9 km away
Local sunshine: ~998 kWh/kWp · +0% vs KT5
KT4 (Sutton)
≈3.7 km away
Local sunshine: ~998 kWh/kWp · +0% vs KT5

Similar sunshine across the UK

HU11 (East Riding of Yorkshire)
~997 kWh/kWp · +0% vs KT5
RG17 (West Berkshire)
~997 kWh/kWp · -0% vs KT5
SE22 (Southwark)
~997 kWh/kWp · -0% vs KT5