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Solar panel cost in Winchester (SO22)

See realistic solar installation costs, savings and payback for SO22 (Winchester) 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
9.7 years
After this, it's pure profit
Upfront Cost
£9,767
What you pay to get started
Annual Benefit
£1,010
What you save every year
Profit Over 25 Years
£15,473
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 1016 kWh/kW — 14 above 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 1016 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)
1016 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: £841, Upfront: £8,139, 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 2031 kWh 812 kWh 1219 kWh £215 £122 £337 £3,256 9.7 yrs £3,475
3 kW 3047 kWh 1219 kWh 1828 kWh £322 £183 £505 £4,883 9.7 yrs £5,212
4 kW 4062 kWh 1625 kWh 2437 kWh £429 £244 £673 £6,511 9.7 yrs £6,950
5 kW 5078 kWh 2031 kWh 3047 kWh £537 £305 £841 £8,139 9.7 yrs £8,687
6 kW 6093 kWh 2437 kWh 3656 kWh £644 £366 £1,010 £9,767 9.7 yrs £10,425
7 kW 7109 kWh 2844 kWh 4265 kWh £751 £427 £1,178 £11,394 9.7 yrs £12,162
8 kW 8125 kWh 3250 kWh 4875 kWh £859 £487 £1,346 £13,022 9.7 yrs £13,900

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: £1,008, Upfront: £10,239, 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 2031 kWh 1219 kWh 812 kWh £322 £81 £403 £5,356 13.3 yrs £2,709
3 kW 3047 kWh 1828 kWh 1219 kWh £483 £122 £605 £6,983 11.5 yrs £5,113
4 kW 4062 kWh 2437 kWh 1625 kWh £644 £162 £806 £8,611 10.7 yrs £7,518
5 kW 5078 kWh 3047 kWh 2031 kWh £805 £203 £1,008 £10,239 10.2 yrs £9,922
6 kW 6093 kWh 3656 kWh 2437 kWh £966 £244 £1,210 £11,867 9.8 yrs £12,327
7 kW 7109 kWh 4265 kWh 2844 kWh £1,127 £284 £1,411 £13,494 9.6 yrs £14,731
8 kW 8125 kWh 4875 kWh 3250 kWh £1,288 £325 £1,613 £15,122 9.4 yrs £17,136

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: £1,091, Upfront: £11,639, Break-even: 10.7 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2031 kWh 1422 kWh 609 kWh £376 £61 £437 £6,756 15.5 yrs £1,976
3 kW 3047 kWh 2133 kWh 914 kWh £563 £91 £655 £8,383 12.8 yrs £4,714
4 kW 4062 kWh 2844 kWh 1219 kWh £751 £122 £873 £10,011 11.5 yrs £7,452
5 kW 5078 kWh 3555 kWh 1523 kWh £939 £152 £1,091 £11,639 10.7 yrs £10,190
6 kW 6093 kWh 4265 kWh 1828 kWh £1,127 £183 £1,310 £13,267 10.1 yrs £12,928
7 kW 7109 kWh 4976 kWh 2133 kWh £1,315 £213 £1,528 £14,894 9.7 yrs £15,666
8 kW 8125 kWh 5687 kWh 2437 kWh £1,503 £244 £1,746 £16,522 9.5 yrs £18,404

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: £1,116, Upfront: £13,389, 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 2031 kWh 1483 kWh 548 kWh £392 £55 £447 £8,506 19.0 yrs £426
3 kW 3047 kWh 2224 kWh 823 kWh £588 £82 £670 £10,133 15.1 yrs £3,264
4 kW 4062 kWh 2965 kWh 1097 kWh £783 £110 £893 £11,761 13.2 yrs £6,102
5 kW 5078 kWh 3707 kWh 1371 kWh £979 £137 £1,116 £13,389 12.0 yrs £8,940
6 kW 6093 kWh 4448 kWh 1645 kWh £1,175 £165 £1,340 £15,017 11.2 yrs £11,778
7 kW 7109 kWh 5190 kWh 1919 kWh £1,371 £192 £1,563 £16,644 10.6 yrs £14,616
8 kW 8125 kWh 5931 kWh 2194 kWh £1,567 £219 £1,786 £18,272 10.2 yrs £17,455

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: £1,133, Upfront: £15,139, 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 2031 kWh 1523 kWh 508 kWh £402 £51 £453 £10,256 22.6 yrs £-1,190
3 kW 3047 kWh 2285 kWh 762 kWh £604 £76 £680 £11,883 17.5 yrs £1,714
4 kW 4062 kWh 3047 kWh 1016 kWh £805 £102 £907 £13,511 14.9 yrs £4,619
5 kW 5078 kWh 3808 kWh 1269 kWh £1,006 £127 £1,133 £15,139 13.4 yrs £7,524
6 kW 6093 kWh 4570 kWh 1523 kWh £1,207 £152 £1,360 £16,767 12.3 yrs £10,429
7 kW 7109 kWh 5332 kWh 1777 kWh £1,409 £178 £1,586 £18,394 11.6 yrs £13,333
8 kW 8125 kWh 6093 kWh 2031 kWh £1,610 £203 £1,813 £20,022 11.0 yrs £16,238

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: £1,150, Upfront: £17,589, 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 2031 kWh 1564 kWh 467 kWh £413 £47 £460 £12,706 27.6 yrs £-3,507
3 kW 3047 kWh 2346 kWh 701 kWh £620 £70 £690 £14,333 20.8 yrs £-536
4 kW 4062 kWh 3128 kWh 934 kWh £826 £93 £920 £15,961 17.4 yrs £2,436
5 kW 5078 kWh 3910 kWh 1168 kWh £1,033 £117 £1,150 £17,589 15.3 yrs £5,407
6 kW 6093 kWh 4692 kWh 1402 kWh £1,240 £140 £1,380 £19,217 13.9 yrs £8,379
7 kW 7109 kWh 5474 kWh 1635 kWh £1,446 £164 £1,610 £20,844 12.9 yrs £11,350
8 kW 8125 kWh 6256 kWh 1869 kWh £1,653 £187 £1,840 £22,472 12.2 yrs £14,322

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 Winchester

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 SO22

Figures below are tailored to SO22 — click through for full league tables.

Big-Roof Britain Rank #790 of 2182
5.3 kWp (UK avg 5.1 kWp)
~11 panels (≈430 W)
Solar Payback Index Rank #541 of 2996
9.7 years (UK avg 10.8 years)
~£1,010 /yr • £9,767 upfront
Standing-Charge Drag Rank #211 of 2996
17.9% (UK avg 26.6%) drag on savings
£181 fixed • ~£1,010 /yr value
Aspect Penalty View ranking →
East −21.2% West −19.7%
Typical output loss versus a south-facing roof (lower is better)

Seasonal solar output in SO22

Monthly generation per kilowatt of solar panels

kWh 40 Jan 53 Feb 87 Mar 115 Apr 122 May 122 Jun 122 Jul 110 Aug 95 Sep 68 Oct 46 Nov 35 Dec
Best month Worst month Winter (Dec–Feb) Other months

Winter output: 50.6% 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 43 kWh per month; the average month produces around 85 kWh. So a typical 4 kW home system would generate roughly 171 kWh in winter, or 339 kWh in an average month.

Your Area at a Glance

Your Electricity Rate
26.42p/kWh
Daily Fixed Charge
49.70p/day
Local Sunshine
1016kWh/kW
A 1 kW system generates ~1016 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: 68% • Flats: 23% • Bungalows: 7% Based on 8,240 properties

Coverage

Winchester (100%)

Areas Covered

St Paul, St Barnabas, St Luke, St Bartholomew, Badger Farm and Oliver's Battery, Wonston and Micheldever, The Worthys, St Michael + 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.

Compare nearby areas

Nearby in Southern

SO21 (Winchester)
≈1.2 km away
Local sunshine: ~1,017 kWh/kWp · +0% vs SO22
SO23 (Winchester)
≈2.1 km away
Local sunshine: ~1,017 kWh/kWp · +0% vs SO22
SO25 (Winchester)
≈2.6 km away
Local sunshine: ~1,017 kWh/kWp · +0% vs SO22
SO53 (Eastleigh)
≈9.9 km away
Local sunshine: ~1,024 kWh/kWp · +1% vs SO22
SO5 (Eastleigh)
≈10.2 km away
Local sunshine: ~1,022 kWh/kWp · +1% vs SO22
SO50 (Eastleigh)
≈10.7 km away
Local sunshine: ~1,024 kWh/kWp · +1% vs SO22

Similar sunshine across the UK

PE21 (Boston)
~1,016 kWh/kWp · +0% vs SO22
ME2 (Medway)
~1,016 kWh/kWp · +0% vs SO22
CM5 (Epping Forest)
~1,015 kWh/kWp · -0% vs SO22