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Solar panel cost in Wiltshire (SN16)

See realistic solar installation costs, savings and payback for SN16 (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
10.0 years
After this, it's pure profit
Upfront Cost
£9,767
What you pay to get started
Annual Benefit
£976
What you save every year
Profit Over 25 Years
£14,629
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 982 kWh/kW — 20 below the regional median (1001).

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 982 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)
982 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: £813, Upfront: £8,139, Break-even: 10.0 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1963 kWh 785 kWh 1178 kWh £207 £118 £325 £3,256 10.0 yrs £3,250
3 kW 2945 kWh 1178 kWh 1767 kWh £311 £177 £488 £4,883 10.0 yrs £4,875
4 kW 3927 kWh 1571 kWh 2356 kWh £415 £236 £651 £6,511 10.0 yrs £6,500
5 kW 4908 kWh 1963 kWh 2945 kWh £519 £294 £813 £8,139 10.0 yrs £8,125
6 kW 5890 kWh 2356 kWh 3534 kWh £622 £353 £976 £9,767 10.0 yrs £9,750
7 kW 6871 kWh 2749 kWh 4123 kWh £726 £412 £1,138 £11,394 10.0 yrs £11,375
8 kW 7853 kWh 3141 kWh 4712 kWh £830 £471 £1,301 £13,022 10.0 yrs £13,000

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: £974, Upfront: £10,239, Break-even: 10.5 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1963 kWh 1178 kWh 785 kWh £311 £79 £390 £5,356 13.7 yrs £2,439
3 kW 2945 kWh 1767 kWh 1178 kWh £467 £118 £585 £6,983 11.9 yrs £4,709
4 kW 3927 kWh 2356 kWh 1571 kWh £622 £157 £780 £8,611 11.0 yrs £6,979
5 kW 4908 kWh 2945 kWh 1963 kWh £778 £196 £974 £10,239 10.5 yrs £9,249
6 kW 5890 kWh 3534 kWh 2356 kWh £934 £236 £1,169 £11,867 10.1 yrs £11,518
7 kW 6871 kWh 4123 kWh 2749 kWh £1,089 £275 £1,364 £13,494 9.9 yrs £13,788
8 kW 7853 kWh 4712 kWh 3141 kWh £1,245 £314 £1,559 £15,122 9.7 yrs £16,058

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: £1,055, Upfront: £11,639, Break-even: 11.0 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1963 kWh 1374 kWh 589 kWh £363 £59 £422 £6,756 16.0 yrs £1,684
3 kW 2945 kWh 2061 kWh 883 kWh £545 £88 £633 £8,383 13.2 yrs £4,276
4 kW 3927 kWh 2749 kWh 1178 kWh £726 £118 £844 £10,011 11.9 yrs £6,868
5 kW 4908 kWh 3436 kWh 1472 kWh £908 £147 £1,055 £11,639 11.0 yrs £9,461
6 kW 5890 kWh 4123 kWh 1767 kWh £1,089 £177 £1,266 £13,267 10.5 yrs £12,053
7 kW 6871 kWh 4810 kWh 2061 kWh £1,271 £206 £1,477 £14,894 10.1 yrs £14,645
8 kW 7853 kWh 5497 kWh 2356 kWh £1,452 £236 £1,688 £16,522 9.8 yrs £17,237

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: £1,079, Upfront: £13,389, Break-even: 12.4 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1963 kWh 1433 kWh 530 kWh £379 £53 £432 £8,506 19.7 yrs £128
3 kW 2945 kWh 2150 kWh 795 kWh £568 £80 £647 £10,133 15.7 yrs £2,816
4 kW 3927 kWh 2866 kWh 1060 kWh £757 £106 £863 £11,761 13.6 yrs £5,505
5 kW 4908 kWh 3583 kWh 1325 kWh £947 £133 £1,079 £13,389 12.4 yrs £8,194
6 kW 5890 kWh 4300 kWh 1590 kWh £1,136 £159 £1,295 £15,017 11.6 yrs £10,883
7 kW 6871 kWh 5016 kWh 1855 kWh £1,325 £186 £1,511 £16,644 11.0 yrs £13,572
8 kW 7853 kWh 5733 kWh 2120 kWh £1,515 £212 £1,727 £18,272 10.6 yrs £16,261

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: £1,095, Upfront: £15,139, Break-even: 13.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1963 kWh 1472 kWh 491 kWh £389 £49 £438 £10,256 23.4 yrs £-1,493
3 kW 2945 kWh 2209 kWh 736 kWh £584 £74 £657 £11,883 18.1 yrs £1,260
4 kW 3927 kWh 2945 kWh 982 kWh £778 £98 £876 £13,511 15.4 yrs £4,013
5 kW 4908 kWh 3681 kWh 1227 kWh £973 £123 £1,095 £15,139 13.8 yrs £6,766
6 kW 5890 kWh 4417 kWh 1472 kWh £1,167 £147 £1,314 £16,767 12.8 yrs £9,520
7 kW 6871 kWh 5154 kWh 1718 kWh £1,362 £172 £1,533 £18,394 12.0 yrs £12,273
8 kW 7853 kWh 5890 kWh 1963 kWh £1,556 £196 £1,752 £20,022 11.4 yrs £15,026

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: £1,111, Upfront: £17,589, Break-even: 15.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1963 kWh 1512 kWh 452 kWh £399 £45 £445 £12,706 28.6 yrs £-3,814
3 kW 2945 kWh 2268 kWh 677 kWh £599 £68 £667 £14,333 21.5 yrs £-997
4 kW 3927 kWh 3023 kWh 903 kWh £799 £90 £889 £15,961 18.0 yrs £1,821
5 kW 4908 kWh 3779 kWh 1129 kWh £998 £113 £1,111 £17,589 15.8 yrs £4,639
6 kW 5890 kWh 4535 kWh 1355 kWh £1,198 £135 £1,334 £19,217 14.4 yrs £7,457
7 kW 6871 kWh 5291 kWh 1580 kWh £1,398 £158 £1,556 £20,844 13.4 yrs £10,274
8 kW 7853 kWh 6047 kWh 1806 kWh £1,598 £181 £1,778 £22,472 12.6 yrs £13,092

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 SN16

Figures below are tailored to SN16 — click through for full league tables.

Big-Roof Britain Rank #544 of 2182
5.5 kWp (UK avg 5.1 kWp)
~11 panels (≈430 W)
Solar Payback Index Rank #1161 of 2996
10.0 years (UK avg 10.8 years)
~£976 /yr • £9,767 upfront
Standing-Charge Drag Rank #300 of 2996
18.5% (UK avg 26.6%) drag on savings
£181 fixed • ~£976 /yr value
Aspect Penalty View ranking →
East −19.9% West −20.6%
Typical output loss versus a south-facing roof (lower is better)

Seasonal solar output in SN16

Monthly generation per kilowatt of solar panels

kWh 37 Jan 50 Feb 85 Mar 111 Apr 121 May 119 Jun 120 Jul 108 Aug 92 Sep 65 Oct 43 Nov 31 Dec
Best month Worst month Winter (Dec–Feb) Other months

Winter output: 48.2% 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 39 kWh per month; the average month produces around 82 kWh. So a typical 4 kW home system would generate roughly 158 kWh in winter, or 327 kWh in an average month.

Your Area at a Glance

Your Electricity Rate
26.42p/kWh
Daily Fixed Charge
49.70p/day
Local Sunshine
982kWh/kW
A 1 kW system generates ~982 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: 73% • Flats: 11% • Bungalows: 14% Based on 4,327 properties

Coverage

Wiltshire (100%)

Areas Covered

Malmesbury, Sherston, Minety, Brinkworth, Royal Wootton Bassett South & West, By Brook, Purton, Tetbury East & Rural

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

GL8 (Cotswold)
≈7.5 km away
Local sunshine: ~991 kWh/kWp · +1% vs SN16
SN15 (Wiltshire)
≈13.7 km away
Local sunshine: ~985 kWh/kWp · +0% vs SN16
SN14 (Wiltshire)
≈14.7 km away
Local sunshine: ~985 kWh/kWp · +0% vs SN16
SN4 (Wiltshire)
≈15.4 km away
Local sunshine: ~998 kWh/kWp · +2% vs SN16
GL7 (Cotswold)
≈16.6 km away
Local sunshine: ~982 kWh/kWp · +0% vs SN16
SN11 (Wiltshire)
≈17.6 km away
Local sunshine: ~988 kWh/kWp · +1% vs SN16

Similar sunshine across the UK

PL31 (Cornwall)
~982 kWh/kWp · +0% vs SN16
LN12 (East Lindsey)
~982 kWh/kWp · +0% vs SN16
OX17 (West Northamptonshire)
~981 kWh/kWp · -0% vs SN16