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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in SP2 (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
11.9 years
After this, it's pure profit
Upfront Cost
£10,173
What you pay to get started
Annual Benefit
£853
What you save every year
Profit Over 25 Years
£11,158
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 1028 kWh/kW — 27 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 1028 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)
1028 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: £853, 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 2057 kWh 823 kWh 1234 kWh £218 £123 £341 £4,069 11.9 yrs £2,757
3 kW 3085 kWh 1234 kWh 1851 kWh £327 £185 £512 £6,104 11.9 yrs £4,135
4 kW 4114 kWh 1646 kWh 2468 kWh £436 £247 £683 £8,138 11.9 yrs £5,513
5 kW 5142 kWh 2057 kWh 3085 kWh £545 £309 £853 £10,173 11.9 yrs £6,891
6 kW 6171 kWh 2468 kWh 3702 kWh £654 £370 £1,024 £12,207 11.9 yrs £8,270
7 kW 7199 kWh 2880 kWh 4319 kWh £763 £432 £1,194 £14,242 11.9 yrs £9,648
8 kW 8228 kWh 3291 kWh 4937 kWh £871 £494 £1,365 £16,276 11.9 yrs £11,026

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: £1,023, Upfront: £12,273, Break-even: 12.0 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2057 kWh 1234 kWh 823 kWh £327 £82 £409 £6,169 15.1 yrs £2,013
3 kW 3085 kWh 1851 kWh 1234 kWh £490 £123 £614 £8,204 13.4 yrs £4,069
4 kW 4114 kWh 2468 kWh 1646 kWh £654 £165 £818 £10,238 12.5 yrs £6,125
5 kW 5142 kWh 3085 kWh 2057 kWh £817 £206 £1,023 £12,273 12.0 yrs £8,181
6 kW 6171 kWh 3702 kWh 2468 kWh £980 £247 £1,227 £14,307 11.7 yrs £10,238
7 kW 7199 kWh 4319 kWh 2880 kWh £1,144 £288 £1,432 £16,342 11.4 yrs £12,294
8 kW 8228 kWh 4937 kWh 3291 kWh £1,307 £329 £1,636 £18,376 11.2 yrs £14,350

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: £1,107, Upfront: £13,673, 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 2057 kWh 1440 kWh 617 kWh £381 £62 £443 £7,569 17.1 yrs £1,290
3 kW 3085 kWh 2160 kWh 926 kWh £572 £93 £664 £9,604 14.5 yrs £3,686
4 kW 4114 kWh 2880 kWh 1234 kWh £763 £123 £886 £11,638 13.1 yrs £6,081
5 kW 5142 kWh 3600 kWh 1543 kWh £953 £154 £1,107 £13,673 12.3 yrs £8,476
6 kW 6171 kWh 4319 kWh 1851 kWh £1,144 £185 £1,329 £15,707 11.8 yrs £10,871
7 kW 7199 kWh 5039 kWh 2160 kWh £1,334 £216 £1,550 £17,742 11.4 yrs £13,267
8 kW 8228 kWh 5759 kWh 2468 kWh £1,525 £247 £1,772 £19,776 11.2 yrs £15,662

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: £1,133, Upfront: £15,423, 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 2057 kWh 1502 kWh 555 kWh £398 £56 £453 £9,319 20.6 yrs £-256
3 kW 3085 kWh 2252 kWh 833 kWh £596 £83 £680 £11,354 16.7 yrs £2,241
4 kW 4114 kWh 3003 kWh 1111 kWh £795 £111 £906 £13,388 14.8 yrs £4,738
5 kW 5142 kWh 3754 kWh 1388 kWh £994 £139 £1,133 £15,423 13.6 yrs £7,235
6 kW 6171 kWh 4505 kWh 1666 kWh £1,193 £167 £1,359 £17,457 12.8 yrs £9,732
7 kW 7199 kWh 5255 kWh 1944 kWh £1,392 £194 £1,586 £19,492 12.3 yrs £12,228
8 kW 8228 kWh 6006 kWh 2221 kWh £1,590 £222 £1,813 £21,526 11.9 yrs £14,725

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: £1,150, Upfront: £17,173, Break-even: 14.9 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2057 kWh 1543 kWh 514 kWh £409 £51 £460 £11,069 24.1 yrs £-1,871
3 kW 3085 kWh 2314 kWh 771 kWh £613 £77 £690 £13,104 19.0 yrs £694
4 kW 4114 kWh 3085 kWh 1028 kWh £817 £103 £920 £15,138 16.5 yrs £3,259
5 kW 5142 kWh 3857 kWh 1286 kWh £1,021 £129 £1,150 £17,173 14.9 yrs £5,824
6 kW 6171 kWh 4628 kWh 1543 kWh £1,226 £154 £1,380 £19,207 13.9 yrs £8,388
7 kW 7199 kWh 5399 kWh 1800 kWh £1,430 £180 £1,610 £21,242 13.2 yrs £10,953
8 kW 8228 kWh 6171 kWh 2057 kWh £1,634 £206 £1,840 £23,276 12.7 yrs £13,518

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: £1,167, Upfront: £19,623, Break-even: 16.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2057 kWh 1584 kWh 473 kWh £419 £47 £467 £13,519 29.0 yrs £-4,185
3 kW 3085 kWh 2376 kWh 710 kWh £629 £71 £700 £15,554 22.2 yrs £-1,552
4 kW 4114 kWh 3168 kWh 946 kWh £839 £95 £933 £17,588 18.8 yrs £1,080
5 kW 5142 kWh 3960 kWh 1183 kWh £1,048 £118 £1,167 £19,623 16.8 yrs £3,713
6 kW 6171 kWh 4751 kWh 1419 kWh £1,258 £142 £1,400 £21,657 15.5 yrs £6,345
7 kW 7199 kWh 5543 kWh 1656 kWh £1,468 £166 £1,633 £23,692 14.5 yrs £8,978
8 kW 8228 kWh 6335 kWh 1892 kWh £1,678 £189 £1,867 £25,726 13.8 yrs £11,610

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 SP2

Figures below are tailored to SP2 — click through for full league tables.

Big-Roof Britain Rank #1476 of 2182
4.7 kWp (UK avg 5.1 kWp)
~10 panels (≈430 W)
Solar Payback Index Rank #444 of 2997
10.4 years (UK avg 11.3 years)
~£980 /yr • £10,173 upfront
Standing-Charge Drag Rank #644 of 2997
16.6% (UK avg 21.7%) drag on savings
£163 fixed • ~£980 /yr value

Your Area at a Glance

Your Electricity Rate
26.48p/kWh
Daily Fixed Charge
44.62p/day
Local Sunshine
1028kWh/kW
A 1 kW system generates ~1028 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: 66% • Flats: 26% • Bungalows: 6% Based on 9,727 properties

Coverage

Wiltshire (100%)

Areas Covered

Salisbury St Edmund's, Wilton, Salisbury St Paul's, Salisbury Harnham West, Salisbury Fisherton & Bemerton Village, Salisbury Bemerton Heath, Salisbury Harnham East, Till Valley + 2 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

SP1 (Wiltshire)
≈1.1 km away
Local sunshine: ~1,019 kWh/kWp · -1% vs SP2
SP5 (Wiltshire)
≈6.9 km away
Local sunshine: ~1,019 kWh/kWp · -1% vs SP2
SP4 (Wiltshire)
≈11.4 km away
Local sunshine: ~1,018 kWh/kWp · -1% vs SP2
SP3 (Wiltshire)
≈14.6 km away
Local sunshine: ~1,031 kWh/kWp · +0% vs SP2
SP6 (New Forest)
≈15.8 km away
Local sunshine: ~1,013 kWh/kWp · -1% vs SP2
SP9 (Wiltshire)
≈20.9 km away
Local sunshine: ~1,016 kWh/kWp · -1% vs SP2

Similar sunshine across the UK

EX5 (East Devon)
~1,028 kWh/kWp · +0% vs SP2
NR30 (Great Yarmouth)
~1,028 kWh/kWp · +0% vs SP2
PL26 (Cornwall)
~1,028 kWh/kWp · -0% vs SP2