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Solar panel cost in Wiltshire (BA15)

See realistic solar installation costs, savings and payback for BA15 (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
11.9 years
After this, it's pure profit
Upfront Cost
£12,207
What you pay to get started
Annual Benefit
£1,029
What you save every year
Profit Over 25 Years
£13,515
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: Bigger systems don’t shorten payback—cost and savings rise together per kW.
  • 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

Costs: Battery prices are typically £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 27.83p/kWh with a 45.70p/day standing charge. Your postcode’s south-facing sunshine yield is 1001 kWh/kW — 0 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 1001 kWh per year on a south-facing roof. We value self-used electricity at 27.8p and exported surplus at a baseline 10p via SEG. Use the calculator above for your exact tariff.

Unit rate
27.8p/kWh
Standing charge
45.7p/day
Sunshine yield (south)
1001 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: £857, Upfront: £10,173, Break-even: 11.9 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2002 kWh 801 kWh 1201 kWh £223 £120 £343 £4,069 11.9 yrs £2,790
3 kW 3003 kWh 1201 kWh 1802 kWh £334 £180 £514 £6,104 11.9 yrs £4,185
4 kW 4004 kWh 1601 kWh 2402 kWh £446 £240 £686 £8,138 11.9 yrs £5,580
5 kW 5005 kWh 2002 kWh 3003 kWh £557 £300 £857 £10,173 11.9 yrs £6,975
6 kW 6006 kWh 2402 kWh 3603 kWh £669 £360 £1,029 £12,207 11.9 yrs £8,370
7 kW 7006 kWh 2803 kWh 4204 kWh £780 £420 £1,200 £14,242 11.9 yrs £9,765
8 kW 8007 kWh 3203 kWh 4804 kWh £891 £480 £1,372 £16,276 11.9 yrs £11,160

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 2,035, battery £/kWh = 700.

3 kWh battery 5 kW example → Annual benefit: £1,036, Upfront: £12,273, Break-even: 11.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2002 kWh 1201 kWh 801 kWh £334 £80 £414 £6,169 14.9 yrs £2,118
3 kW 3003 kWh 1802 kWh 1201 kWh £501 £120 £622 £8,204 13.2 yrs £4,227
4 kW 4004 kWh 2402 kWh 1601 kWh £669 £160 £829 £10,238 12.4 yrs £6,336
5 kW 5005 kWh 3003 kWh 2002 kWh £836 £200 £1,036 £12,273 11.8 yrs £8,444
6 kW 6006 kWh 3603 kWh 2402 kWh £1,003 £240 £1,243 £14,307 11.5 yrs £10,553
7 kW 7006 kWh 4204 kWh 2803 kWh £1,170 £280 £1,450 £16,342 11.3 yrs £12,662
8 kW 8007 kWh 4804 kWh 3203 kWh £1,337 £320 £1,657 £18,376 11.1 yrs £14,771

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 2,035, battery £/kWh = 700.

5 kWh battery 5 kW example → Annual benefit: £1,125, Upfront: £13,673, 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 2002 kWh 1401 kWh 601 kWh £390 £60 £450 £7,569 16.8 yrs £1,432
3 kW 3003 kWh 2102 kWh 901 kWh £585 £90 £675 £9,604 14.2 yrs £3,897
4 kW 4004 kWh 2803 kWh 1201 kWh £780 £120 £900 £11,638 12.9 yrs £6,363
5 kW 5005 kWh 3503 kWh 1501 kWh £975 £150 £1,125 £13,673 12.2 yrs £8,829
6 kW 6006 kWh 4204 kWh 1802 kWh £1,170 £180 £1,350 £15,707 11.6 yrs £11,295
7 kW 7006 kWh 4905 kWh 2102 kWh £1,365 £210 £1,575 £17,742 11.3 yrs £13,761
8 kW 8007 kWh 5605 kWh 2402 kWh £1,560 £240 £1,800 £19,776 11.0 yrs £16,227

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 2,035, battery £/kWh = 700.

7.5 kWh battery 5 kW example → Annual benefit: £1,152, Upfront: £15,423, 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 2002 kWh 1461 kWh 540 kWh £407 £54 £461 £9,319 20.2 yrs £-104
3 kW 3003 kWh 2192 kWh 811 kWh £610 £81 £691 £11,354 16.4 yrs £2,469
4 kW 4004 kWh 2923 kWh 1081 kWh £813 £108 £921 £13,388 14.5 yrs £5,042
5 kW 5005 kWh 3653 kWh 1351 kWh £1,017 £135 £1,152 £15,423 13.4 yrs £7,615
6 kW 6006 kWh 4384 kWh 1621 kWh £1,220 £162 £1,382 £17,457 12.6 yrs £10,187
7 kW 7006 kWh 5115 kWh 1892 kWh £1,423 £189 £1,613 £19,492 12.1 yrs £12,760
8 kW 8007 kWh 5845 kWh 2162 kWh £1,627 £216 £1,843 £21,526 11.7 yrs £15,333

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 2,035, battery £/kWh = 700.

10 kWh battery 5 kW example → Annual benefit: £1,170, Upfront: £17,173, Break-even: 14.7 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2002 kWh 1501 kWh 500 kWh £418 £50 £468 £11,069 23.7 yrs £-1,711
3 kW 3003 kWh 2252 kWh 751 kWh £627 £75 £702 £13,104 18.7 yrs £933
4 kW 4004 kWh 3003 kWh 1001 kWh £836 £100 £936 £15,138 16.2 yrs £3,577
5 kW 5005 kWh 3753 kWh 1251 kWh £1,045 £125 £1,170 £17,173 14.7 yrs £6,221
6 kW 6006 kWh 4504 kWh 1501 kWh £1,254 £150 £1,404 £19,207 13.7 yrs £8,866
7 kW 7006 kWh 5255 kWh 1752 kWh £1,462 £175 £1,638 £21,242 13.0 yrs £11,510
8 kW 8007 kWh 6006 kWh 2002 kWh £1,671 £200 £1,872 £23,276 12.4 yrs £14,154

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 2,035, battery £/kWh = 700.

13.5 kWh battery 5 kW example → Annual benefit: £1,188, Upfront: £19,623, Break-even: 16.5 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2002 kWh 1541 kWh 460 kWh £429 £46 £475 £13,519 28.5 yrs £-4,019
3 kW 3003 kWh 2312 kWh 691 kWh £643 £69 £713 £15,554 21.8 yrs £-1,303
4 kW 4004 kWh 3083 kWh 921 kWh £858 £92 £950 £17,588 18.5 yrs £1,413
5 kW 5005 kWh 3854 kWh 1151 kWh £1,072 £115 £1,188 £19,623 16.5 yrs £4,128
6 kW 6006 kWh 4624 kWh 1381 kWh £1,287 £138 £1,425 £21,657 15.2 yrs £6,844
7 kW 7006 kWh 5395 kWh 1611 kWh £1,501 £161 £1,663 £23,692 14.3 yrs £9,560
8 kW 8007 kWh 6166 kWh 1842 kWh £1,716 £184 £1,900 £25,726 13.5 yrs £12,275

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 2,035, 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.

Insights for BA15

Figures below are tailored to BA15 — click through for full league tables.

Big-Roof Britain Rank #525 of 2182
5.6 kWp (UK avg 5.1 kWp)
~12 panels (≈430 W)
Solar Payback Index Rank #737 of 2997
11.9 years (UK avg 12.6 years)
~£1,029 /yr • £12,207 upfront
Standing-Charge Drag Rank #122 of 2997
16.2% (UK avg 24.6%) drag on savings
£167 fixed • ~£1,029 /yr value
Aspect Penalty View ranking →
East −20.5% West −19.9%
Typical output loss versus a south-facing roof (lower is better)

Your Area at a Glance

Your Electricity Rate
27.83p/kWh
Daily Fixed Charge
45.70p/day
Local Sunshine
1001kWh/kW
A 1 kW system generates ~1001 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: 69% • Flats: 15% • Bungalows: 14% Based on 3,171 properties

Coverage

Wiltshire (95%)|Bath and North East Somerset (5%)

Areas Covered

Bradford-on-Avon South, Winsley & Westwood, Bradford-on-Avon North, Kingsmead, Bathavon South

Data Sources & Assumptions

Solar yield: PVGIS (EU Joint Research Centre), January 2025 data

Electricity rates: Ofgem price cap, Q1 2026

Installation costs: MCS certified installer data, March 2025

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

BA14 (Wiltshire)
≈4.3 km away
Local sunshine: ~1,000 kWh/kWp · -0% vs BA15
SN12 (Wiltshire)
≈8.5 km away
Local sunshine: ~994 kWh/kWp · -1% vs BA15
SN13 (Wiltshire)
≈9.6 km away
Local sunshine: ~986 kWh/kWp · -1% vs BA15
BA13 (Wiltshire)
≈10.0 km away
Local sunshine: ~1,006 kWh/kWp · +1% vs BA15
BA11 (Somerset)
≈13.6 km away
Local sunshine: ~981 kWh/kWp · -2% vs BA15
SN14 (Wiltshire)
≈14.0 km away
Local sunshine: ~985 kWh/kWp · -2% vs BA15

Similar sunshine across the UK

CB6 (East Cambridgeshire)
~1,001 kWh/kWp · -0% vs BA15
NR3 (Norwich)
~1,001 kWh/kWp · -0% vs BA15
PE2 (Peterborough)
~1,001 kWh/kWp · +0% vs BA15