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Solar panel cost in Wiltshire (SN10)

See realistic solar installation costs, savings and payback for SN10 (Wiltshire) 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
£828
What you save every year
Profit Over 25 Years
£12,550
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 999 kWh/kW — 2 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 999 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)
999 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: £828, 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 1998 kWh 799 kWh 1199 kWh £211 £120 £331 £3,256 9.8 yrs £3,365
3 kW 2997 kWh 1199 kWh 1798 kWh £317 £180 £497 £4,883 9.8 yrs £5,048
4 kW 3996 kWh 1598 kWh 2398 kWh £422 £240 £662 £6,511 9.8 yrs £6,730
5 kW 4995 kWh 1998 kWh 2997 kWh £528 £300 £828 £8,139 9.8 yrs £8,413
6 kW 5994 kWh 2398 kWh 3596 kWh £633 £360 £993 £9,767 9.8 yrs £10,095
7 kW 6993 kWh 2797 kWh 4196 kWh £739 £420 £1,159 £11,394 9.8 yrs £11,778
8 kW 7992 kWh 3197 kWh 4795 kWh £845 £480 £1,324 £13,022 9.8 yrs £13,460

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: £992, 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 1998 kWh 1199 kWh 799 kWh £317 £80 £397 £5,356 13.5 yrs £2,577
3 kW 2997 kWh 1798 kWh 1199 kWh £475 £120 £595 £6,983 11.7 yrs £4,916
4 kW 3996 kWh 2398 kWh 1598 kWh £633 £160 £793 £8,611 10.9 yrs £7,255
5 kW 4995 kWh 2997 kWh 1998 kWh £792 £200 £992 £10,239 10.3 yrs £9,593
6 kW 5994 kWh 3596 kWh 2398 kWh £950 £240 £1,190 £11,867 10.0 yrs £11,932
7 kW 6993 kWh 4196 kWh 2797 kWh £1,109 £280 £1,388 £13,494 9.7 yrs £14,271
8 kW 7992 kWh 4795 kWh 3197 kWh £1,267 £320 £1,587 £15,122 9.5 yrs £16,609

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: £1,074, 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 1998 kWh 1399 kWh 599 kWh £370 £60 £429 £6,756 15.7 yrs £1,833
3 kW 2997 kWh 2098 kWh 899 kWh £554 £90 £644 £8,383 13.0 yrs £4,500
4 kW 3996 kWh 2797 kWh 1199 kWh £739 £120 £859 £10,011 11.7 yrs £7,167
5 kW 4995 kWh 3496 kWh 1498 kWh £924 £150 £1,074 £11,639 10.8 yrs £9,834
6 kW 5994 kWh 4196 kWh 1798 kWh £1,109 £180 £1,288 £13,267 10.3 yrs £12,500
7 kW 6993 kWh 4895 kWh 2098 kWh £1,293 £210 £1,503 £14,894 9.9 yrs £15,167
8 kW 7992 kWh 5594 kWh 2398 kWh £1,478 £240 £1,718 £16,522 9.6 yrs £17,834

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: £1,098, 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 1998 kWh 1459 kWh 539 kWh £385 £54 £439 £8,506 19.4 yrs £280
3 kW 2997 kWh 2188 kWh 809 kWh £578 £81 £659 £10,133 15.4 yrs £3,045
4 kW 3996 kWh 2917 kWh 1079 kWh £771 £108 £879 £11,761 13.4 yrs £5,811
5 kW 4995 kWh 3646 kWh 1349 kWh £963 £135 £1,098 £13,389 12.2 yrs £8,576
6 kW 5994 kWh 4376 kWh 1618 kWh £1,156 £162 £1,318 £15,017 11.4 yrs £11,341
7 kW 6993 kWh 5105 kWh 1888 kWh £1,349 £189 £1,538 £16,644 10.8 yrs £14,106
8 kW 7992 kWh 5834 kWh 2158 kWh £1,541 £216 £1,757 £18,272 10.4 yrs £16,871

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: £1,115, 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 1998 kWh 1498 kWh 500 kWh £396 £50 £446 £10,256 23.0 yrs £-1,338
3 kW 2997 kWh 2248 kWh 749 kWh £594 £75 £669 £11,883 17.8 yrs £1,492
4 kW 3996 kWh 2997 kWh 999 kWh £792 £100 £892 £13,511 15.2 yrs £4,323
5 kW 4995 kWh 3746 kWh 1249 kWh £990 £125 £1,115 £15,139 13.6 yrs £7,154
6 kW 5994 kWh 4496 kWh 1498 kWh £1,188 £150 £1,338 £16,767 12.5 yrs £9,985
7 kW 6993 kWh 5245 kWh 1748 kWh £1,386 £175 £1,560 £18,394 11.8 yrs £12,815
8 kW 7992 kWh 5994 kWh 1998 kWh £1,584 £200 £1,783 £20,022 11.2 yrs £15,646

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: £1,131, 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 1998 kWh 1538 kWh 460 kWh £406 £46 £452 £12,706 28.1 yrs £-3,657
3 kW 2997 kWh 2308 kWh 689 kWh £610 £69 £679 £14,333 21.1 yrs £-761
4 kW 3996 kWh 3077 kWh 919 kWh £813 £92 £905 £15,961 17.6 yrs £2,136
5 kW 4995 kWh 3846 kWh 1149 kWh £1,016 £115 £1,131 £17,589 15.6 yrs £5,032
6 kW 5994 kWh 4615 kWh 1379 kWh £1,219 £138 £1,357 £19,217 14.2 yrs £7,928
7 kW 6993 kWh 5385 kWh 1608 kWh £1,423 £161 £1,583 £20,844 13.2 yrs £10,825
8 kW 7992 kWh 6154 kWh 1838 kWh £1,626 £184 £1,810 £22,472 12.4 yrs £13,721

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 Wiltshire

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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Check what MCS certification means

Understand DNO, G98 and G99 export limits

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This is a practical sanity-check request, not an instant quote promise. The Blue Ape quote route above remains available if you already want installer introductions.

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Insights for SN10

Figures below are tailored to SN10 — click through for full league tables.

Big-Roof Britain Rank #995 of 2182
5.1 kWp (UK avg 5.1 kWp)
~11 panels (≈430 W)
Solar Payback Index Rank #727 of 2996
9.8 years (UK avg 10.8 years)
~£828 /yr • £8,139 upfront
Standing-Charge Drag Rank #862 of 2996
21.9% (UK avg 26.6%) drag on savings
£181 fixed • ~£828 /yr value
Aspect Penalty View ranking →
East −20.4% West −19.7%
Typical output loss versus a south-facing roof (lower is better)

Seasonal solar output in SN10

Monthly generation per kilowatt of solar panels

kWh 39 Jan 51 Feb 86 Mar 113 Apr 122 May 120 Jun 122 Jul 108 Aug 93 Sep 66 Oct 45 Nov 33 Dec
Best month Worst month Winter (Dec–Feb) Other months

Winter output: 49.3% of an average month (Dec–Feb)

Best / worst month: May / 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 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
999kWh/kW
A 1 kW system generates ~999 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: 69% • Flats: 17% • Bungalows: 13% Based on 8,938 properties

Coverage

Wiltshire (100%)

Areas Covered

Devizes North, Urchfont & Bishops Cannings, The Lavingtons, Devizes East, Bromham, Rowde & Roundway, Devizes Rural West, Devizes South + 1 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 Southern

SN11 (Wiltshire)
≈9.8 km away
Local sunshine: ~988 kWh/kWp · -1% vs SN10
SN12 (Wiltshire)
≈10.3 km away
Local sunshine: ~994 kWh/kWp · -1% vs SN10
SN15 (Wiltshire)
≈15.0 km away
Local sunshine: ~985 kWh/kWp · -1% vs SN10
BA14 (Wiltshire)
≈15.2 km away
Local sunshine: ~1,000 kWh/kWp · +0% vs SN10
SN9 (Wiltshire)
≈15.4 km away
Local sunshine: ~989 kWh/kWp · -1% vs SN10
SN13 (Wiltshire)
≈16.7 km away
Local sunshine: ~986 kWh/kWp · -1% vs SN10

Similar sunshine across the UK

BR2 (Bromley)
~999 kWh/kWp · +0% vs SN10
LN5 (Lincoln)
~999 kWh/kWp · -0% vs SN10
BS77 (Bristol, City of)
~999 kWh/kWp · -0% vs SN10