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Postcode solar briefing

Solar panel cost in Southampton (SO19)

See realistic solar installation costs, savings and payback for SO19 (Southampton) using official UK data. Start with the local verdict, then adjust the calculator for your roof, usage and export assumptions.

Local model Calculator unchanged Quote assumptions checked
Local solar briefing

Solar in SO19: roof size may be the main upside, so compare proposed system sizes carefully.

This is a modelled local view, not a promise of savings. Use it as a quick sense-check before comparing installer quotes for SO19.

Typical system
5.0 kW
starting point
Annual benefit
£880
before battery costs
Payback estimate
9.2 years
panel-only baseline
Postcode verdict
Roof-size upside
local model
Local context

Why SO19 differs

South-facing yield is about 6.1% above the Southern median.

The starting system size is close to the regional typical size at 5.0 kW.

Local housing mix looks suitable for a postcode-level estimate, but your actual roof still matters more than the area average.

Battery payback depends heavily on evening use, export tariff and whether the installer has assumed optimistic self-consumption.

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
9.2 years
After this, it's pure profit
Upfront Cost
£8,139
What you pay to get started
Annual Benefit
£880
What you save every year
Profit Over 25 Years
£13,872
After paying itself off, you're this much ahead

Ready to Get Started?

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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.

Before you sign

What to challenge in solar quotes for SO19

Use the calculator above as a baseline, then ask installers to explain where their quote differs from the local assumptions.

If the proposed system is much larger than 5.0 kW, ask why it fits your roof and usage.

Compare payback with and without a battery before accepting a bundled quote.

Check which Smart Export Guarantee tariff is assumed. The calculator baseline uses 10p/kWh.

Confirm who handles MCS certification and DNO/G98/G99 paperwork before comparing finance or warranties.

Compare quotes Check MCS DNO, G98 and G99
New quote check

Want a quote sanity check for SO19?

Share the first part of your postcode and a few basics. We’ll help you check whether system size, battery, export and paperwork assumptions look sensible before you commit to installer conversations.

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.

Request a quote sanity check →

Insights for SO19

Figures below are tailored to SO19 — click through for full league tables.

Big-Roof Britain Rank #2031 of 2182
4.1 kWp (UK avg 5.1 kWp)
~9 panels (≈430 W)
Solar Payback Index Rank #174 of 2996
9.2 years (UK avg 10.8 years)
~£881 /yr • £8,139 upfront
Standing-Charge Drag Rank #660 of 2996
20.5% (UK avg 26.6%) drag on savings
£181 fixed • ~£881 /yr value
Aspect Penalty View ranking →
East −21.1% West −21.2%
Typical output loss versus a south-facing roof (lower is better)
Compare areas

Compare SO19 with nearby and similar areas

Nearby postcode areas in Southern

SO2 (Southampton)
≈1.7 km away
Local sunshine: ~1,031 kWh/kWp · -3% vs SO19
SO18 (Southampton)
≈2.0 km away
Local sunshine: ~1,037 kWh/kWp · -2% vs SO19
SO14 (Southampton)
≈2.7 km away
Local sunshine: ~1,037 kWh/kWp · -2% vs SO19
SO9 (Southampton)
≈3.3 km away
Local sunshine: ~1,050 kWh/kWp · -1% vs SO19
SO17 (Southampton)
≈3.5 km away
Local sunshine: ~1,031 kWh/kWp · -3% vs SO19
SO30 (Eastleigh)
≈4.4 km away
Local sunshine: ~1,043 kWh/kWp · -2% vs SO19

Similar solar-yield areas

CT1 (Canterbury)
~1,063 kWh/kWp · +0% vs SO19
CO1 (Colchester)
~1,062 kWh/kWp · -0% vs SO19
CO4 (Colchester)
~1,062 kWh/kWp · -0% vs SO19

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 1063 kWh/kW — 62 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 1063 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)
1063 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: £880, Upfront: £8,139, Break-even: 9.2 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2126 kWh 850 kWh 1275 kWh £225 £128 £352 £3,256 9.2 yrs £3,788
3 kW 3188 kWh 1275 kWh 1913 kWh £337 £191 £528 £4,883 9.2 yrs £5,682
4 kW 4251 kWh 1701 kWh 2551 kWh £449 £255 £704 £6,511 9.2 yrs £7,576
5 kW 5314 kWh 2126 kWh 3188 kWh £562 £319 £880 £8,139 9.2 yrs £9,470
6 kW 6377 kWh 2551 kWh 3826 kWh £674 £383 £1,057 £9,767 9.2 yrs £11,364
7 kW 7440 kWh 2976 kWh 4464 kWh £786 £446 £1,233 £11,394 9.2 yrs £13,258
8 kW 8503 kWh 3401 kWh 5102 kWh £899 £510 £1,409 £13,022 9.2 yrs £15,152

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: £1,055, Upfront: £10,239, Break-even: 9.7 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2126 kWh 1275 kWh 850 kWh £337 £85 £422 £5,356 12.7 yrs £3,084
3 kW 3188 kWh 1913 kWh 1275 kWh £505 £128 £633 £6,983 11.0 yrs £5,676
4 kW 4251 kWh 2551 kWh 1701 kWh £674 £170 £844 £8,611 10.2 yrs £8,268
5 kW 5314 kWh 3188 kWh 2126 kWh £842 £213 £1,055 £10,239 9.7 yrs £10,861
6 kW 6377 kWh 3826 kWh 2551 kWh £1,011 £255 £1,266 £11,867 9.4 yrs £13,453
7 kW 7440 kWh 4464 kWh 2976 kWh £1,179 £298 £1,477 £13,494 9.1 yrs £16,045
8 kW 8503 kWh 5102 kWh 3401 kWh £1,348 £340 £1,688 £15,122 9.0 yrs £18,637

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: £1,142, Upfront: £11,639, Break-even: 10.2 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2126 kWh 1488 kWh 638 kWh £393 £64 £457 £6,756 14.8 yrs £2,382
3 kW 3188 kWh 2232 kWh 957 kWh £590 £96 £685 £8,383 12.2 yrs £5,323
4 kW 4251 kWh 2976 kWh 1275 kWh £786 £128 £914 £10,011 11.0 yrs £8,265
5 kW 5314 kWh 3720 kWh 1594 kWh £983 £159 £1,142 £11,639 10.2 yrs £11,206
6 kW 6377 kWh 4464 kWh 1913 kWh £1,179 £191 £1,371 £13,267 9.7 yrs £14,147
7 kW 7440 kWh 5208 kWh 2232 kWh £1,376 £223 £1,599 £14,894 9.3 yrs £17,088
8 kW 8503 kWh 5952 kWh 2551 kWh £1,572 £255 £1,828 £16,522 9.0 yrs £20,029

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: £1,168, Upfront: £13,389, Break-even: 11.5 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2126 kWh 1552 kWh 574 kWh £410 £57 £467 £8,506 18.2 yrs £842
3 kW 3188 kWh 2328 kWh 861 kWh £615 £86 £701 £10,133 14.5 yrs £3,888
4 kW 4251 kWh 3103 kWh 1148 kWh £820 £115 £935 £11,761 12.6 yrs £6,933
5 kW 5314 kWh 3879 kWh 1435 kWh £1,025 £143 £1,168 £13,389 11.5 yrs £9,979
6 kW 6377 kWh 4655 kWh 1722 kWh £1,230 £172 £1,402 £15,017 10.7 yrs £13,025
7 kW 7440 kWh 5431 kWh 2009 kWh £1,435 £201 £1,636 £16,644 10.2 yrs £16,071
8 kW 8503 kWh 6207 kWh 2296 kWh £1,640 £230 £1,869 £18,272 9.8 yrs £19,117

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: £1,186, Upfront: £15,139, Break-even: 12.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2126 kWh 1594 kWh 531 kWh £421 £53 £474 £10,256 21.6 yrs £-769
3 kW 3188 kWh 2391 kWh 797 kWh £632 £80 £712 £11,883 16.7 yrs £2,347
4 kW 4251 kWh 3188 kWh 1063 kWh £842 £106 £949 £13,511 14.2 yrs £5,463
5 kW 5314 kWh 3986 kWh 1329 kWh £1,053 £133 £1,186 £15,139 12.8 yrs £8,578
6 kW 6377 kWh 4783 kWh 1594 kWh £1,264 £159 £1,423 £16,767 11.8 yrs £11,694
7 kW 7440 kWh 5580 kWh 1860 kWh £1,474 £186 £1,660 £18,394 11.1 yrs £14,810
8 kW 8503 kWh 6377 kWh 2126 kWh £1,685 £213 £1,897 £20,022 10.6 yrs £17,925

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: £1,203, Upfront: £17,589, Break-even: 14.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2126 kWh 1637 kWh 489 kWh £432 £49 £481 £12,706 26.4 yrs £-3,079
3 kW 3188 kWh 2455 kWh 733 kWh £649 £73 £722 £14,333 19.9 yrs £106
4 kW 4251 kWh 3274 kWh 978 kWh £865 £98 £963 £15,961 16.6 yrs £3,292
5 kW 5314 kWh 4092 kWh 1222 kWh £1,081 £122 £1,203 £17,589 14.6 yrs £6,477
6 kW 6377 kWh 4910 kWh 1467 kWh £1,297 £147 £1,444 £19,217 13.3 yrs £9,663
7 kW 7440 kWh 5729 kWh 1711 kWh £1,514 £171 £1,685 £20,844 12.4 yrs £12,848
8 kW 8503 kWh 6547 kWh 1956 kWh £1,730 £196 £1,925 £22,472 11.7 yrs £16,034

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.

Seasonal solar output in SO19

Monthly generation per kilowatt of solar panels

kWh 41 Jan 56 Feb 92 Mar 120 Apr 127 May 130 Jun 130 Jul 115 Aug 98 Sep 70 Oct 48 Nov 36 Dec
Best month Worst month Winter (Dec–Feb) Other months

Winter output: 50.0% of an average month (Dec–Feb)

Best / worst month: Jun / Dec

These figures show output per kilowatt (kW) of panels installed. In winter, a 1 kW system here produces about 44 kWh per month; the average month produces around 89 kWh. So a typical 4 kW home system would generate roughly 177 kWh in winter, or 354 kWh in an average month.

Your Area at a Glance

Your Electricity Rate
26.42p/kWh
Daily Fixed Charge
49.70p/day
Local Sunshine
1063kWh/kW
A 1 kW system generates ~1063 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: 46% • Flats: 43% • Bungalows: 6% Based on 15,416 properties

Coverage

Southampton (99%)|Eastleigh (1%)

Areas Covered

Thornhill, Peartree, Woolston, Sholing, Bitterne Park, West End South, Harefield, Bursledon & Hound North + 1 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.