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Solar panel cost in Mole Valley (KT23)

See realistic solar installation costs, savings and payback for KT23 (Mole Valley) 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
9.7 years
After this, it's pure profit
Upfront Cost
£9,767
What you pay to get started
Annual Benefit
£1,002
What you save every year
Profit Over 25 Years
£15,280
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 1002 kWh/kW — 27 below the regional median (1029).

Read the full story

A typical roof here lands around 6.0 kW, with most eligible homes comfortably fitting within 3–6 kW. Each kilowatt of panels produces roughly 1002 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)
1002 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: £835, Upfront: £8,139, Break-even: 9.7 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2004 kWh 801 kWh 1202 kWh £214 £120 £334 £3,256 9.7 yrs £3,424
3 kW 3005 kWh 1202 kWh 1803 kWh £321 £180 £501 £4,883 9.7 yrs £5,135
4 kW 4007 kWh 1603 kWh 2404 kWh £427 £240 £668 £6,511 9.7 yrs £6,847
5 kW 5009 kWh 2004 kWh 3005 kWh £534 £301 £835 £8,139 9.7 yrs £8,559
6 kW 6011 kWh 2404 kWh 3606 kWh £641 £361 £1,002 £9,767 9.7 yrs £10,271
7 kW 7012 kWh 2805 kWh 4207 kWh £748 £421 £1,169 £11,394 9.7 yrs £11,982
8 kW 8014 kWh 3206 kWh 4809 kWh £855 £481 £1,336 £13,022 9.7 yrs £13,694

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: £1,002, Upfront: £10,239, Break-even: 10.2 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2004 kWh 1202 kWh 801 kWh £321 £80 £401 £5,356 13.4 yrs £2,660
3 kW 3005 kWh 1803 kWh 1202 kWh £481 £120 £601 £6,983 11.6 yrs £5,039
4 kW 4007 kWh 2404 kWh 1603 kWh £641 £160 £802 £8,611 10.7 yrs £7,419
5 kW 5009 kWh 3005 kWh 2004 kWh £802 £200 £1,002 £10,239 10.2 yrs £9,799
6 kW 6011 kWh 3606 kWh 2404 kWh £962 £240 £1,202 £11,867 9.9 yrs £12,179
7 kW 7012 kWh 4207 kWh 2805 kWh £1,122 £280 £1,403 £13,494 9.6 yrs £14,558
8 kW 8014 kWh 4809 kWh 3206 kWh £1,282 £321 £1,603 £15,122 9.4 yrs £16,938

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: £1,085, Upfront: £11,639, Break-even: 10.7 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2004 kWh 1402 kWh 601 kWh £374 £60 £434 £6,756 15.6 yrs £1,928
3 kW 3005 kWh 2104 kWh 902 kWh £561 £90 £651 £8,383 12.9 yrs £4,641
4 kW 4007 kWh 2805 kWh 1202 kWh £748 £120 £868 £10,011 11.5 yrs £7,355
5 kW 5009 kWh 3506 kWh 1503 kWh £935 £150 £1,085 £11,639 10.7 yrs £10,069
6 kW 6011 kWh 4207 kWh 1803 kWh £1,122 £180 £1,302 £13,267 10.2 yrs £12,783
7 kW 7012 kWh 4909 kWh 2104 kWh £1,309 £210 £1,520 £14,894 9.8 yrs £15,496
8 kW 8014 kWh 5610 kWh 2404 kWh £1,496 £240 £1,737 £16,522 9.5 yrs £18,210

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: £1,110, 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 2004 kWh 1463 kWh 541 kWh £390 £54 £444 £8,506 19.1 yrs £378
3 kW 3005 kWh 2194 kWh 811 kWh £585 £81 £666 £10,133 15.2 yrs £3,192
4 kW 4007 kWh 2925 kWh 1082 kWh £780 £108 £888 £11,761 13.2 yrs £6,006
5 kW 5009 kWh 3656 kWh 1352 kWh £975 £135 £1,110 £13,389 12.1 yrs £8,820
6 kW 6011 kWh 4388 kWh 1623 kWh £1,170 £162 £1,333 £15,017 11.3 yrs £11,634
7 kW 7012 kWh 5119 kWh 1893 kWh £1,365 £189 £1,555 £16,644 10.7 yrs £14,448
8 kW 8014 kWh 5850 kWh 2164 kWh £1,560 £216 £1,777 £18,272 10.3 yrs £17,262

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: £1,127, Upfront: £15,139, Break-even: 13.4 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2004 kWh 1503 kWh 501 kWh £401 £50 £451 £10,256 22.7 yrs £-1,238
3 kW 3005 kWh 2254 kWh 751 kWh £601 £75 £676 £11,883 17.6 yrs £1,642
4 kW 4007 kWh 3005 kWh 1002 kWh £802 £100 £902 £13,511 15.0 yrs £4,523
5 kW 5009 kWh 3757 kWh 1252 kWh £1,002 £125 £1,127 £15,139 13.4 yrs £7,404
6 kW 6011 kWh 4508 kWh 1503 kWh £1,202 £150 £1,353 £16,767 12.4 yrs £10,285
7 kW 7012 kWh 5259 kWh 1753 kWh £1,403 £175 £1,578 £18,394 11.7 yrs £13,165
8 kW 8014 kWh 6011 kWh 2004 kWh £1,603 £200 £1,803 £20,022 11.1 yrs £16,046

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: £1,144, Upfront: £17,589, Break-even: 15.4 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2004 kWh 1543 kWh 461 kWh £411 £46 £458 £12,706 27.8 yrs £-3,555
3 kW 3005 kWh 2314 kWh 691 kWh £617 £69 £686 £14,333 20.9 yrs £-607
4 kW 4007 kWh 3085 kWh 922 kWh £823 £92 £915 £15,961 17.4 yrs £2,340
5 kW 5009 kWh 3857 kWh 1152 kWh £1,029 £115 £1,144 £17,589 15.4 yrs £5,288
6 kW 6011 kWh 4628 kWh 1382 kWh £1,234 £138 £1,373 £19,217 14.0 yrs £8,235
7 kW 7012 kWh 5400 kWh 1613 kWh £1,440 £161 £1,601 £20,844 13.0 yrs £11,183
8 kW 8014 kWh 6171 kWh 1843 kWh £1,646 £184 £1,830 £22,472 12.3 yrs £14,130

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 Mole Valley

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 KT23

Figures below are tailored to KT23 — click through for full league tables.

Big-Roof Britain Rank #217 of 2182
6.1 kWp (UK avg 5.1 kWp)
~13 panels (≈430 W)
Solar Payback Index Rank #481 of 2996
9.7 years (UK avg 10.8 years)
~£1,002 /yr • £9,767 upfront
Standing-Charge Drag Rank #510 of 2996
19.9% (UK avg 26.6%) drag on savings
£199 fixed • ~£1,002 /yr value
Aspect Penalty View ranking →
East −20.8% West −19.5%
Typical output loss versus a south-facing roof (lower is better)

Seasonal solar output in KT23

Monthly generation per kilowatt of solar panels

kWh 38 Jan 51 Feb 85 Mar 112 Apr 120 May 122 Jun 123 Jul 110 Aug 93 Sep 67 Oct 46 Nov 34 Dec
Best month Worst month Winter (Dec–Feb) Other months

Winter output: 49.2% 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 164 kWh in winter, or 334 kWh in an average month.

Your Area at a Glance

Your Electricity Rate
26.67p/kWh
Daily Fixed Charge
54.45p/day
Local Sunshine
1002kWh/kW
A 1 kW system generates ~1002 kWh per year. A typical home uses ~2,700 kWh per year.
Typical System Size
6.0kW
For houses & bungalows in this area

Local Property Data

Property Types

Houses: 58% • Flats: 22% • Bungalows: 18% Based on 2,818 properties

Coverage

Mole Valley (98%)|Guildford (2%)

Areas Covered

Bookham West, Bookham East & Eastwick Park, Leatherhead South, Effingham

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

KT22 (Mole Valley)
≈3.3 km away
Local sunshine: ~989 kWh/kWp · -1% vs KT23
KT24 (Guildford)
≈4.3 km away
Local sunshine: ~997 kWh/kWp · -0% vs KT23
KT11 (Elmbridge)
≈5.9 km away
Local sunshine: ~997 kWh/kWp · -0% vs KT23
KT21 (Mole Valley)
≈6.0 km away
Local sunshine: ~989 kWh/kWp · -1% vs KT23
RH4 (Mole Valley)
≈6.1 km away
Local sunshine: ~1,012 kWh/kWp · +1% vs KT23
RH3 (Mole Valley)
≈8.3 km away
Local sunshine: ~1,015 kWh/kWp · +1% vs KT23

Similar sunshine across the UK

IP25 (Breckland)
~1,002 kWh/kWp · +0% vs KT23
MK46 (Milton Keynes)
~1,002 kWh/kWp · +0% vs KT23
SG18 (Central Bedfordshire)
~1,002 kWh/kWp · +0% vs KT23