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Solar panel cost in Wiltshire (BA14)

See realistic solar installation costs, savings and payback for BA14 (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
£829
What you save every year
Profit Over 25 Years
£12,581
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 1000 kWh/kW — 1 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 1000 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)
1000 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: £829, 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 2001 kWh 800 kWh 1201 kWh £211 £120 £332 £3,256 9.8 yrs £3,375
3 kW 3001 kWh 1201 kWh 1801 kWh £317 £180 £497 £4,883 9.8 yrs £5,062
4 kW 4002 kWh 1601 kWh 2401 kWh £423 £240 £663 £6,511 9.8 yrs £6,749
5 kW 5002 kWh 2001 kWh 3001 kWh £529 £300 £829 £8,139 9.8 yrs £8,437
6 kW 6003 kWh 2401 kWh 3602 kWh £634 £360 £995 £9,767 9.8 yrs £10,124
7 kW 7003 kWh 2801 kWh 4202 kWh £740 £420 £1,160 £11,394 9.8 yrs £11,811
8 kW 8004 kWh 3201 kWh 4802 kWh £846 £480 £1,326 £13,022 9.8 yrs £13,499

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: £993, 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 2001 kWh 1201 kWh 800 kWh £317 £80 £397 £5,356 13.5 yrs £2,589
3 kW 3001 kWh 1801 kWh 1201 kWh £476 £120 £596 £6,983 11.7 yrs £4,933
4 kW 4002 kWh 2401 kWh 1601 kWh £634 £160 £794 £8,611 10.8 yrs £7,278
5 kW 5002 kWh 3001 kWh 2001 kWh £793 £200 £993 £10,239 10.3 yrs £9,622
6 kW 6003 kWh 3602 kWh 2401 kWh £952 £240 £1,192 £11,867 10.0 yrs £11,967
7 kW 7003 kWh 4202 kWh 2801 kWh £1,110 £280 £1,390 £13,494 9.7 yrs £14,311
8 kW 8004 kWh 4802 kWh 3201 kWh £1,269 £320 £1,589 £15,122 9.5 yrs £16,655

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: £1,075, 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 2001 kWh 1401 kWh 600 kWh £370 £60 £430 £6,756 15.7 yrs £1,846
3 kW 3001 kWh 2101 kWh 900 kWh £555 £90 £645 £8,383 13.0 yrs £4,519
4 kW 4002 kWh 2801 kWh 1201 kWh £740 £120 £860 £10,011 11.6 yrs £7,192
5 kW 5002 kWh 3502 kWh 1501 kWh £925 £150 £1,075 £11,639 10.8 yrs £9,865
6 kW 6003 kWh 4202 kWh 1801 kWh £1,110 £180 £1,290 £13,267 10.3 yrs £12,538
7 kW 7003 kWh 4902 kWh 2101 kWh £1,295 £210 £1,505 £14,894 9.9 yrs £15,211
8 kW 8004 kWh 5603 kWh 2401 kWh £1,480 £240 £1,720 £16,522 9.6 yrs £17,884

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: £1,100, 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 2001 kWh 1461 kWh 540 kWh £386 £54 £440 £8,506 19.3 yrs £293
3 kW 3001 kWh 2191 kWh 810 kWh £579 £81 £660 £10,133 15.4 yrs £3,065
4 kW 4002 kWh 2921 kWh 1080 kWh £772 £108 £880 £11,761 13.4 yrs £5,836
5 kW 5002 kWh 3652 kWh 1351 kWh £965 £135 £1,100 £13,389 12.2 yrs £8,608
6 kW 6003 kWh 4382 kWh 1621 kWh £1,158 £162 £1,320 £15,017 11.4 yrs £11,379
7 kW 7003 kWh 5112 kWh 1891 kWh £1,351 £189 £1,540 £16,644 10.8 yrs £14,151
8 kW 8004 kWh 5843 kWh 2161 kWh £1,544 £216 £1,760 £18,272 10.4 yrs £16,922

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: £1,116, 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 2001 kWh 1501 kWh 500 kWh £396 £50 £447 £10,256 23.0 yrs £-1,326
3 kW 3001 kWh 2251 kWh 750 kWh £595 £75 £670 £11,883 17.7 yrs £1,512
4 kW 4002 kWh 3001 kWh 1000 kWh £793 £100 £893 £13,511 15.1 yrs £4,349
5 kW 5002 kWh 3752 kWh 1251 kWh £991 £125 £1,116 £15,139 13.6 yrs £7,186
6 kW 6003 kWh 4502 kWh 1501 kWh £1,189 £150 £1,340 £16,767 12.5 yrs £10,023
7 kW 7003 kWh 5252 kWh 1751 kWh £1,388 £175 £1,563 £18,394 11.8 yrs £12,861
8 kW 8004 kWh 6003 kWh 2001 kWh £1,586 £200 £1,786 £20,022 11.2 yrs £15,698

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: £1,133, 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 2001 kWh 1541 kWh 460 kWh £407 £46 £453 £12,706 28.0 yrs £-3,644
3 kW 3001 kWh 2311 kWh 690 kWh £611 £69 £680 £14,333 21.1 yrs £-741
4 kW 4002 kWh 3081 kWh 920 kWh £814 £92 £906 £15,961 17.6 yrs £2,162
5 kW 5002 kWh 3852 kWh 1151 kWh £1,018 £115 £1,133 £17,589 15.5 yrs £5,065
6 kW 6003 kWh 4622 kWh 1381 kWh £1,221 £138 £1,359 £19,217 14.1 yrs £7,968
7 kW 7003 kWh 5392 kWh 1611 kWh £1,425 £161 £1,586 £20,844 13.1 yrs £10,871
8 kW 8004 kWh 6163 kWh 1841 kWh £1,628 £184 £1,812 £22,472 12.4 yrs £13,774

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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Insights for BA14

Figures below are tailored to BA14 — click through for full league tables.

Big-Roof Britain Rank #1220 of 2182
4.9 kWp (UK avg 5.1 kWp)
~10 panels (≈430 W)
Solar Payback Index Rank #571 of 2996
9.8 years (UK avg 10.8 years)
~£828 /yr • £8,139 upfront
Standing-Charge Drag Rank #845 of 2996
21.9% (UK avg 26.6%) drag on savings
£181 fixed • ~£828 /yr value
Aspect Penalty View ranking →
East −20.3% West −19.8%
Typical output loss versus a south-facing roof (lower is better)

Seasonal solar output in BA14

Monthly generation per kilowatt of solar panels

kWh 39 Jan 52 Feb 86 Mar 113 Apr 122 May 120 Jun 122 Jul 109 Aug 93 Sep 66 Oct 45 Nov 33 Dec
Best month Worst month Winter (Dec–Feb) Other months

Winter output: 49.6% 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 165 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
1000kWh/kW
A 1 kW system generates ~1000 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: 67% • Flats: 22% • Bungalows: 10% Based on 12,051 properties

Coverage

Wiltshire (100%)

Areas Covered

Trowbridge Central, Trowbridge Adcroft, Trowbridge Drynham, Trowbridge Lambrok, Southwick, Trowbridge Grove, Melksham Without West & Rural, Holt + 4 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

BA15 (Wiltshire)
≈4.3 km away
Local sunshine: ~1,001 kWh/kWp · +0% vs BA14
BA13 (Wiltshire)
≈6.3 km away
Local sunshine: ~1,006 kWh/kWp · +1% vs BA14
SN12 (Wiltshire)
≈7.6 km away
Local sunshine: ~994 kWh/kWp · -1% vs BA14
SN13 (Wiltshire)
≈11.9 km away
Local sunshine: ~986 kWh/kWp · -1% vs BA14
BA11 (Somerset)
≈12.7 km away
Local sunshine: ~981 kWh/kWp · -2% vs BA14
BA12 (Wiltshire)
≈13.6 km away
Local sunshine: ~1,011 kWh/kWp · +1% vs BA14

Similar sunshine across the UK

TA4 (Somerset)
~1,000 kWh/kWp · -0% vs BA14
NR8 (Broadland)
~1,000 kWh/kWp · -0% vs BA14
NP19 (Newport)
~1,000 kWh/kWp · -0% vs BA14