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Solar panel cost in Winchester (PO17)

See realistic solar installation costs, savings and payback for PO17 (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
9.1 years
After this, it's pure profit
Upfront Cost
£8,139
What you pay to get started
Annual Benefit
£893
What you save every year
Profit Over 25 Years
£14,197
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 1078 kWh/kW — 77 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 1078 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)
1078 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: £893, Upfront: £8,139, Break-even: 9.1 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2157 kWh 863 kWh 1294 kWh £228 £129 £357 £3,256 9.1 yrs £3,892
3 kW 3236 kWh 1294 kWh 1941 kWh £342 £194 £536 £4,883 9.1 yrs £5,838
4 kW 4314 kWh 1726 kWh 2588 kWh £456 £259 £715 £6,511 9.1 yrs £7,784
5 kW 5392 kWh 2157 kWh 3236 kWh £570 £324 £893 £8,139 9.1 yrs £9,730
6 kW 6471 kWh 2588 kWh 3883 kWh £684 £388 £1,072 £9,767 9.1 yrs £11,676
7 kW 7550 kWh 3020 kWh 4530 kWh £798 £453 £1,251 £11,394 9.1 yrs £13,622
8 kW 8628 kWh 3451 kWh 5177 kWh £912 £518 £1,429 £13,022 9.1 yrs £15,568

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: £1,071, Upfront: £10,239, Break-even: 9.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2157 kWh 1294 kWh 863 kWh £342 £86 £428 £5,356 12.5 yrs £3,209
3 kW 3236 kWh 1941 kWh 1294 kWh £513 £129 £642 £6,983 10.9 yrs £5,863
4 kW 4314 kWh 2588 kWh 1726 kWh £684 £173 £856 £8,611 10.1 yrs £8,517
5 kW 5392 kWh 3236 kWh 2157 kWh £855 £216 £1,071 £10,239 9.6 yrs £11,172
6 kW 6471 kWh 3883 kWh 2588 kWh £1,026 £259 £1,285 £11,867 9.2 yrs £13,826
7 kW 7550 kWh 4530 kWh 3020 kWh £1,197 £302 £1,499 £13,494 9.0 yrs £16,480
8 kW 8628 kWh 5177 kWh 3451 kWh £1,368 £345 £1,713 £15,122 8.8 yrs £19,135

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: £1,159, Upfront: £11,639, Break-even: 10.0 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2157 kWh 1510 kWh 647 kWh £399 £65 £464 £6,756 14.6 yrs £2,517
3 kW 3236 kWh 2265 kWh 971 kWh £598 £97 £695 £8,383 12.1 yrs £5,525
4 kW 4314 kWh 3020 kWh 1294 kWh £798 £129 £927 £10,011 10.8 yrs £8,534
5 kW 5392 kWh 3775 kWh 1618 kWh £997 £162 £1,159 £11,639 10.0 yrs £11,542
6 kW 6471 kWh 4530 kWh 1941 kWh £1,197 £194 £1,391 £13,267 9.5 yrs £14,551
7 kW 7550 kWh 5285 kWh 2265 kWh £1,396 £226 £1,623 £14,894 9.2 yrs £17,559
8 kW 8628 kWh 6040 kWh 2588 kWh £1,596 £259 £1,855 £16,522 8.9 yrs £20,568

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: £1,186, Upfront: £13,389, Break-even: 11.3 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2157 kWh 1575 kWh 582 kWh £416 £58 £474 £8,506 17.9 yrs £979
3 kW 3236 kWh 2362 kWh 874 kWh £624 £87 £711 £10,133 14.2 yrs £4,094
4 kW 4314 kWh 3149 kWh 1165 kWh £832 £116 £949 £11,761 12.4 yrs £7,209
5 kW 5392 kWh 3937 kWh 1456 kWh £1,040 £146 £1,186 £13,389 11.3 yrs £10,324
6 kW 6471 kWh 4724 kWh 1747 kWh £1,248 £175 £1,423 £15,017 10.6 yrs £13,438
7 kW 7550 kWh 5511 kWh 2038 kWh £1,456 £204 £1,660 £16,644 10.0 yrs £16,553
8 kW 8628 kWh 6298 kWh 2330 kWh £1,664 £233 £1,897 £18,272 9.6 yrs £19,668

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: £1,203, Upfront: £15,139, 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 2157 kWh 1618 kWh 539 kWh £427 £54 £481 £10,256 21.3 yrs £-629
3 kW 3236 kWh 2427 kWh 809 kWh £641 £81 £722 £11,883 16.5 yrs £2,557
4 kW 4314 kWh 3236 kWh 1078 kWh £855 £108 £963 £13,511 14.0 yrs £5,742
5 kW 5392 kWh 4044 kWh 1348 kWh £1,069 £135 £1,203 £15,139 12.6 yrs £8,928
6 kW 6471 kWh 4853 kWh 1618 kWh £1,282 £162 £1,444 £16,767 11.6 yrs £12,114
7 kW 7550 kWh 5662 kWh 1887 kWh £1,496 £189 £1,685 £18,394 10.9 yrs £15,299
8 kW 8628 kWh 6471 kWh 2157 kWh £1,710 £216 £1,925 £20,022 10.4 yrs £18,485

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: £1,221, Upfront: £17,589, Break-even: 14.4 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2157 kWh 1661 kWh 496 kWh £439 £50 £488 £12,706 26.0 yrs £-2,937
3 kW 3236 kWh 2491 kWh 744 kWh £658 £74 £733 £14,333 19.6 yrs £319
4 kW 4314 kWh 3322 kWh 992 kWh £878 £99 £977 £15,961 16.3 yrs £3,576
5 kW 5392 kWh 4152 kWh 1240 kWh £1,097 £124 £1,221 £17,589 14.4 yrs £6,832
6 kW 6471 kWh 4983 kWh 1488 kWh £1,316 £149 £1,465 £19,217 13.1 yrs £10,089
7 kW 7550 kWh 5813 kWh 1736 kWh £1,536 £174 £1,709 £20,844 12.2 yrs £13,345
8 kW 8628 kWh 6644 kWh 1984 kWh £1,755 £198 £1,954 £22,472 11.5 yrs £16,601

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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Insights for PO17

Figures below are tailored to PO17 — click through for full league tables.

Big-Roof Britain Rank #874 of 2182
5.2 kWp (UK avg 5.1 kWp)
~11 panels (≈430 W)
Solar Payback Index Rank #146 of 2996
9.1 years (UK avg 10.8 years)
~£893 /yr • £8,139 upfront
Standing-Charge Drag Rank #630 of 2996
20.3% (UK avg 26.6%) drag on savings
£181 fixed • ~£893 /yr value
Aspect Penalty View ranking →
East −21.1% West −21.3%
Typical output loss versus a south-facing roof (lower is better)

Seasonal solar output in PO17

Monthly generation per kilowatt of solar panels

kWh 41 Jan 56 Feb 93 Mar 122 Apr 128 May 132 Jun 132 Jul 117 Aug 100 Sep 70 Oct 50 Nov 37 Dec
Best month Worst month Winter (Dec–Feb) Other months

Winter output: 50.1% of an average month (Dec–Feb)

Best / worst month: Jul / Dec

These figures show output per kilowatt (kW) of panels installed. In winter, a 1 kW system here produces about 45 kWh per month; the average month produces around 90 kWh. So a typical 4 kW home system would generate roughly 180 kWh in winter, or 359 kWh in an average month.

Your Area at a Glance

Your Electricity Rate
26.42p/kWh
Daily Fixed Charge
49.70p/day
Local Sunshine
1078kWh/kW
A 1 kW system generates ~1078 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: 65% • Flats: 24% • Bungalows: 8% Based on 2,014 properties

Coverage

Winchester (85%)|Fareham (15%)

Areas Covered

Southwick and Wickham, Central Meon Valley, Uplands & Funtley, Wallington & Downend, Fort Fareham, Whiteley and Shedfield, Portchester Castle, Paulsgrove

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

PO15 (Fareham)
≈3.7 km away
Local sunshine: ~1,078 kWh/kWp · -0% vs PO17
PO16 (Fareham)
≈4.4 km away
Local sunshine: ~1,078 kWh/kWp · -0% vs PO17
PO14 (Fareham)
≈5.5 km away
Local sunshine: ~1,078 kWh/kWp · -0% vs PO17
SO32 (Winchester)
≈6.7 km away
Local sunshine: ~1,032 kWh/kWp · -4% vs PO17
SO31 (Fareham)
≈7.2 km away
Local sunshine: ~1,076 kWh/kWp · -0% vs PO17
SO3 (Eastleigh)
≈7.8 km away
Local sunshine: ~1,032 kWh/kWp · -4% vs PO17

Similar sunshine across the UK

CT11 (Thanet)
~1,078 kWh/kWp · -0% vs PO17
DT6 (Dorset)
~1,079 kWh/kWp · +0% vs PO17
IP12 (East Suffolk)
~1,077 kWh/kWp · -0% vs PO17