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Solar panel cost in Slough (SL95)

See realistic solar installation costs, savings and payback for SL95 (Slough) 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
£827
What you save every year
Profit Over 25 Years
£12,532
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 Southern, the current unit rate is 26.42p/kWh with a 49.70p/day standing charge. Your postcode’s south-facing sunshine yield is 998 kWh/kW — 3 below the regional median (1001).

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 998 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
49.7p/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: £827, 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 1996 kWh 798 kWh 1198 kWh £211 £120 £331 £3,256 9.8 yrs £3,359
3 kW 2994 kWh 1198 kWh 1797 kWh £316 £180 £496 £4,883 9.8 yrs £5,039
4 kW 3992 kWh 1597 kWh 2395 kWh £422 £240 £661 £6,511 9.8 yrs £6,718
5 kW 4991 kWh 1996 kWh 2994 kWh £527 £299 £827 £8,139 9.8 yrs £8,398
6 kW 5989 kWh 2395 kWh 3593 kWh £633 £359 £992 £9,767 9.8 yrs £10,078
7 kW 6987 kWh 2795 kWh 4192 kWh £738 £419 £1,158 £11,394 9.8 yrs £11,757
8 kW 7985 kWh 3194 kWh 4791 kWh £844 £479 £1,323 £13,022 9.8 yrs £13,437

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: £991, 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 1996 kWh 1198 kWh 798 kWh £316 £80 £396 £5,356 13.5 yrs £2,570
3 kW 2994 kWh 1797 kWh 1198 kWh £475 £120 £594 £6,983 11.7 yrs £4,906
4 kW 3992 kWh 2395 kWh 1597 kWh £633 £160 £793 £8,611 10.9 yrs £7,241
5 kW 4991 kWh 2994 kWh 1996 kWh £791 £200 £991 £10,239 10.3 yrs £9,576
6 kW 5989 kWh 3593 kWh 2395 kWh £949 £240 £1,189 £11,867 10.0 yrs £11,911
7 kW 6987 kWh 4192 kWh 2795 kWh £1,108 £279 £1,387 £13,494 9.7 yrs £14,246
8 kW 7985 kWh 4791 kWh 3194 kWh £1,266 £319 £1,585 £15,122 9.5 yrs £16,581

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: £1,073, Upfront: £11,639, Break-even: 10.9 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 £369 £60 £429 £6,756 15.7 yrs £1,826
3 kW 2994 kWh 2096 kWh 898 kWh £554 £90 £644 £8,383 13.0 yrs £4,489
4 kW 3992 kWh 2795 kWh 1198 kWh £738 £120 £858 £10,011 11.7 yrs £7,152
5 kW 4991 kWh 3493 kWh 1497 kWh £923 £150 £1,073 £11,639 10.9 yrs £9,815
6 kW 5989 kWh 4192 kWh 1797 kWh £1,108 £180 £1,287 £13,267 10.3 yrs £12,478
7 kW 6987 kWh 4891 kWh 2096 kWh £1,292 £210 £1,502 £14,894 9.9 yrs £15,141
8 kW 7985 kWh 5589 kWh 2395 kWh £1,477 £240 £1,716 £16,522 9.6 yrs £17,804

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: £1,097, Upfront: £13,389, Break-even: 12.2 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 £385 £54 £439 £8,506 19.4 yrs £273
3 kW 2994 kWh 2186 kWh 808 kWh £578 £81 £658 £10,133 15.4 yrs £3,034
4 kW 3992 kWh 2915 kWh 1078 kWh £770 £108 £878 £11,761 13.4 yrs £5,795
5 kW 4991 kWh 3643 kWh 1347 kWh £963 £135 £1,097 £13,389 12.2 yrs £8,556
6 kW 5989 kWh 4372 kWh 1617 kWh £1,155 £162 £1,317 £15,017 11.4 yrs £11,318
7 kW 6987 kWh 5100 kWh 1886 kWh £1,348 £189 £1,536 £16,644 10.8 yrs £14,079
8 kW 7985 kWh 5829 kWh 2156 kWh £1,540 £216 £1,756 £18,272 10.4 yrs £16,840

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: £1,114, Upfront: £15,139, Break-even: 13.6 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 £396 £50 £445 £10,256 23.0 yrs £-1,346
3 kW 2994 kWh 2246 kWh 749 kWh £593 £75 £668 £11,883 17.8 yrs £1,481
4 kW 3992 kWh 2994 kWh 998 kWh £791 £100 £891 £13,511 15.2 yrs £4,307
5 kW 4991 kWh 3743 kWh 1248 kWh £989 £125 £1,114 £15,139 13.6 yrs £7,134
6 kW 5989 kWh 4492 kWh 1497 kWh £1,187 £150 £1,336 £16,767 12.5 yrs £9,961
7 kW 6987 kWh 5240 kWh 1747 kWh £1,384 £175 £1,559 £18,394 11.8 yrs £12,788
8 kW 7985 kWh 5989 kWh 1996 kWh £1,582 £200 £1,782 £20,022 11.2 yrs £15,615

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: £1,130, Upfront: £17,589, Break-even: 15.6 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 £406 £46 £452 £12,706 28.1 yrs £-3,665
3 kW 2994 kWh 2306 kWh 689 kWh £609 £69 £678 £14,333 21.1 yrs £-773
4 kW 3992 kWh 3074 kWh 918 kWh £812 £92 £904 £15,961 17.7 yrs £2,120
5 kW 4991 kWh 3843 kWh 1148 kWh £1,015 £115 £1,130 £17,589 15.6 yrs £5,012
6 kW 5989 kWh 4611 kWh 1377 kWh £1,218 £138 £1,356 £19,217 14.2 yrs £7,904
7 kW 6987 kWh 5380 kWh 1607 kWh £1,421 £161 £1,582 £20,844 13.2 yrs £10,797
8 kW 7985 kWh 6148 kWh 1837 kWh £1,624 £184 £1,808 £22,472 12.4 yrs £13,689

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 Slough

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 SL95

Figures below are tailored to SL95 — click through for full league tables.

Solar Payback Index Rank #722 of 2996
9.8 years (UK avg 10.8 years)
~£827 /yr • £8,139 upfront
Standing-Charge Drag Rank #861 of 2996
21.9% (UK avg 26.6%) drag on savings
£181 fixed • ~£827 /yr value
Aspect Penalty View ranking →
East −21.8% West −19.5%
Typical output loss versus a south-facing roof (lower is better)

Seasonal solar output in SL95

Monthly generation per kilowatt of solar panels

kWh 40 Jan 52 Feb 85 Mar 111 Apr 119 May 120 Jun 121 Jul 109 Aug 93 Sep 67 Oct 45 Nov 35 Dec
Best month Worst month Winter (Dec–Feb) Other months

Winter output: 50.9% 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 83 kWh. So a typical 4 kW home system would generate roughly 169 kWh in winter, or 333 kWh in an average month.

Your Area at a Glance

Your Electricity Rate
26.42p/kWh
Daily Fixed Charge
49.70p/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
5.0kW
For houses & bungalows in this area

Local Property Data

Property Types

No EPC data available for this outcode

Coverage

Slough (100%)

Areas Covered

Langley Foxborough, Slough Central

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 Southern

SL3 (Slough)
≈2.1 km away
Local sunshine: ~1,007 kWh/kWp · +1% vs SL95
SL0 (Buckinghamshire)
≈2.8 km away
Local sunshine: ~1,002 kWh/kWp · +0% vs SL95
UB7 (Hillingdon)
≈4.3 km away
Local sunshine: ~1,007 kWh/kWp · +1% vs SL95
SL1 (Slough)
≈5.4 km away
Local sunshine: ~998 kWh/kWp · +0% vs SL95
UB8 (Hillingdon)
≈5.6 km away
Local sunshine: ~1,000 kWh/kWp · +0% vs SL95
TW19 (Spelthorne)
≈5.9 km away
Local sunshine: ~1,001 kWh/kWp · +0% vs SL95

Similar sunshine across the UK

EX6 (Teignbridge)
~998 kWh/kWp · +0% vs SL95
KT10 (Elmbridge)
~998 kWh/kWp · -0% vs SL95
FY5 (Wyre)
~998 kWh/kWp · -0% vs SL95