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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in BA13 (Wiltshire)

See if solar pays off for you in Wiltshire — price, savings and payback in under a minute (official UK data).

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
12.2 years
After this, it's pure profit
Upfront Cost
£10,173
What you pay to get started
Annual Benefit
£835
What you save every year
Profit Over 25 Years
£10,701
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 26.48p/kWh with a 44.62p/day standing charge. Your postcode’s south-facing sunshine yield is 1006 kWh/kW — 5 above 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 1006 kWh per year on a south-facing roof. We value self-used electricity at 26.5p and exported surplus at a baseline 10p via SEG. Use the calculator above for your exact tariff.

Unit rate
26.5p/kWh
Standing charge
44.6p/day
Sunshine yield (south)
1006 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: £835, Upfront: £10,173, 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 2013 kWh 805 kWh 1208 kWh £213 £121 £334 £4,069 12.2 yrs £2,610
3 kW 3019 kWh 1208 kWh 1812 kWh £320 £181 £501 £6,104 12.2 yrs £3,916
4 kW 4026 kWh 1610 kWh 2415 kWh £426 £242 £668 £8,138 12.2 yrs £5,221
5 kW 5032 kWh 2013 kWh 3019 kWh £533 £302 £835 £10,173 12.2 yrs £6,526
6 kW 6039 kWh 2415 kWh 3623 kWh £640 £362 £1,002 £12,207 12.2 yrs £7,831
7 kW 7045 kWh 2818 kWh 4227 kWh £746 £423 £1,169 £14,242 12.2 yrs £9,136
8 kW 8051 kWh 3221 kWh 4831 kWh £853 £483 £1,336 £16,276 12.2 yrs £10,442

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: £1,001, Upfront: £12,273, Break-even: 12.3 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2013 kWh 1208 kWh 805 kWh £320 £81 £400 £6,169 15.4 yrs £1,837
3 kW 3019 kWh 1812 kWh 1208 kWh £480 £121 £600 £8,204 13.7 yrs £3,806
4 kW 4026 kWh 2415 kWh 1610 kWh £640 £161 £801 £10,238 12.8 yrs £5,775
5 kW 5032 kWh 3019 kWh 2013 kWh £800 £201 £1,001 £12,273 12.3 yrs £7,743
6 kW 6039 kWh 3623 kWh 2415 kWh £959 £242 £1,201 £14,307 11.9 yrs £9,712
7 kW 7045 kWh 4227 kWh 2818 kWh £1,119 £282 £1,401 £16,342 11.7 yrs £11,680
8 kW 8051 kWh 4831 kWh 3221 kWh £1,279 £322 £1,601 £18,376 11.5 yrs £13,649

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: £1,084, Upfront: £13,673, Break-even: 12.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2013 kWh 1409 kWh 604 kWh £373 £60 £433 £7,569 17.5 yrs £1,101
3 kW 3019 kWh 2113 kWh 906 kWh £560 £91 £650 £9,604 14.8 yrs £3,401
4 kW 4026 kWh 2818 kWh 1208 kWh £746 £121 £867 £11,638 13.4 yrs £5,701
5 kW 5032 kWh 3522 kWh 1510 kWh £933 £151 £1,084 £13,673 12.6 yrs £8,002
6 kW 6039 kWh 4227 kWh 1812 kWh £1,119 £181 £1,300 £15,707 12.1 yrs £10,302
7 kW 7045 kWh 4931 kWh 2113 kWh £1,306 £211 £1,517 £17,742 11.7 yrs £12,602
8 kW 8051 kWh 5636 kWh 2415 kWh £1,492 £242 £1,734 £19,776 11.4 yrs £14,903

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: £1,109, Upfront: £15,423, Break-even: 13.9 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2013 kWh 1469 kWh 543 kWh £389 £54 £443 £9,319 21.0 yrs £-450
3 kW 3019 kWh 2204 kWh 815 kWh £584 £82 £665 £11,354 17.1 yrs £1,950
4 kW 4026 kWh 2939 kWh 1087 kWh £778 £109 £887 £13,388 15.1 yrs £4,349
5 kW 5032 kWh 3673 kWh 1359 kWh £973 £136 £1,109 £15,423 13.9 yrs £6,749
6 kW 6039 kWh 4408 kWh 1630 kWh £1,167 £163 £1,330 £17,457 13.1 yrs £9,149
7 kW 7045 kWh 5143 kWh 1902 kWh £1,362 £190 £1,552 £19,492 12.6 yrs £11,549
8 kW 8051 kWh 5877 kWh 2174 kWh £1,556 £217 £1,774 £21,526 12.1 yrs £13,949

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: £1,125, Upfront: £17,173, Break-even: 15.3 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2013 kWh 1510 kWh 503 kWh £400 £50 £450 £11,069 24.6 yrs £-2,068
3 kW 3019 kWh 2264 kWh 755 kWh £600 £75 £675 £13,104 19.4 yrs £399
4 kW 4026 kWh 3019 kWh 1006 kWh £800 £101 £900 £15,138 16.8 yrs £2,865
5 kW 5032 kWh 3774 kWh 1258 kWh £999 £126 £1,125 £17,173 15.3 yrs £5,331
6 kW 6039 kWh 4529 kWh 1510 kWh £1,199 £151 £1,350 £19,207 14.2 yrs £7,797
7 kW 7045 kWh 5284 kWh 1761 kWh £1,399 £176 £1,575 £21,242 13.5 yrs £10,263
8 kW 8051 kWh 6039 kWh 2013 kWh £1,599 £201 £1,800 £23,276 12.9 yrs £12,730

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: £1,142, Upfront: £19,623, Break-even: 17.2 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2013 kWh 1550 kWh 463 kWh £410 £46 £457 £13,519 29.6 yrs £-4,385
3 kW 3019 kWh 2325 kWh 694 kWh £616 £69 £685 £15,554 22.7 yrs £-1,852
4 kW 4026 kWh 3100 kWh 926 kWh £821 £93 £913 £17,588 19.3 yrs £680
5 kW 5032 kWh 3875 kWh 1157 kWh £1,026 £116 £1,142 £19,623 17.2 yrs £3,213
6 kW 6039 kWh 4650 kWh 1389 kWh £1,231 £139 £1,370 £21,657 15.8 yrs £5,745
7 kW 7045 kWh 5425 kWh 1620 kWh £1,436 £162 £1,598 £23,692 14.8 yrs £8,278
8 kW 8051 kWh 6200 kWh 1852 kWh £1,642 £185 £1,827 £25,726 14.1 yrs £10,810

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 BA13

Figures below are tailored to BA13 — click through for full league tables.

Big-Roof Britain Rank #1077 of 2182
5.0 kWp (UK avg 5.1 kWp)
~11 panels (≈430 W)
Solar Payback Index Rank #592 of 2997
10.6 years (UK avg 11.3 years)
~£959 /yr • £10,173 upfront
Standing-Charge Drag Rank #717 of 2997
17.0% (UK avg 21.7%) drag on savings
£163 fixed • ~£959 /yr value

Your Area at a Glance

Your Electricity Rate
26.48p/kWh
Daily Fixed Charge
44.62p/day
Local Sunshine
1006kWh/kW
A 1 kW system generates ~1006 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: 72% • Flats: 13% • Bungalows: 14% Based on 5,782 properties

Coverage

Wiltshire (100%)

Areas Covered

Westbury West, Ethandune, Westbury North, Westbury East, Warminster North & Rural, Southwick, Devizes Rural West, Melksham Without West & Rural + 1 more

Data Sources & Assumptions

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

Electricity rates: Ofgem price cap, Q4 2025

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)
≈6.3 km away
Local sunshine: ~1,000 kWh/kWp · -1% vs BA13
BA12 (Wiltshire)
≈7.4 km away
Local sunshine: ~1,011 kWh/kWp · +0% vs BA13
BA11 (Somerset)
≈9.7 km away
Local sunshine: ~981 kWh/kWp · -3% vs BA13
BA15 (Wiltshire)
≈10.0 km away
Local sunshine: ~1,001 kWh/kWp · -1% vs BA13
SN12 (Wiltshire)
≈12.7 km away
Local sunshine: ~994 kWh/kWp · -1% vs BA13
SN10 (Wiltshire)
≈17.0 km away
Local sunshine: ~999 kWh/kWp · -1% vs BA13

Similar sunshine across the UK

RH12 (Horsham)
~1,006 kWh/kWp · -0% vs BA13
CM92 (Harlow)
~1,006 kWh/kWp · -0% vs BA13
BS21 (North Somerset)
~1,006 kWh/kWp · -0% vs BA13