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Solar panel cost in Isle of Wight (PO31)

See realistic solar installation costs, savings and payback for PO31 (Isle of Wight) 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
9.2 years
After this, it's pure profit
Upfront Cost
£8,139
What you pay to get started
Annual Benefit
£884
What you save every year
Profit Over 25 Years
£13,960
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 1067 kWh/kW — 66 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 1067 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)
1067 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: £884, 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 2134 kWh 854 kWh 1280 kWh £226 £128 £354 £3,256 9.2 yrs £3,816
3 kW 3201 kWh 1280 kWh 1921 kWh £338 £192 £530 £4,883 9.2 yrs £5,724
4 kW 4268 kWh 1707 kWh 2561 kWh £451 £256 £707 £6,511 9.2 yrs £7,632
5 kW 5335 kWh 2134 kWh 3201 kWh £564 £320 £884 £8,139 9.2 yrs £9,540
6 kW 6402 kWh 2561 kWh 3841 kWh £677 £384 £1,061 £9,767 9.2 yrs £11,448
7 kW 7469 kWh 2988 kWh 4482 kWh £789 £448 £1,238 £11,394 9.2 yrs £13,357
8 kW 8537 kWh 3415 kWh 5122 kWh £902 £512 £1,414 £13,022 9.2 yrs £15,265

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: £1,059, 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 2134 kWh 1280 kWh 854 kWh £338 £85 £424 £5,356 12.6 yrs £3,118
3 kW 3201 kWh 1921 kWh 1280 kWh £507 £128 £636 £6,983 11.0 yrs £5,727
4 kW 4268 kWh 2561 kWh 1707 kWh £677 £171 £847 £8,611 10.2 yrs £8,336
5 kW 5335 kWh 3201 kWh 2134 kWh £846 £213 £1,059 £10,239 9.7 yrs £10,945
6 kW 6402 kWh 3841 kWh 2561 kWh £1,015 £256 £1,271 £11,867 9.3 yrs £13,554
7 kW 7469 kWh 4482 kWh 2988 kWh £1,184 £299 £1,483 £13,494 9.1 yrs £16,163
8 kW 8537 kWh 5122 kWh 3415 kWh £1,353 £341 £1,695 £15,122 8.9 yrs £18,771

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: £1,147, Upfront: £11,639, Break-even: 10.1 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2134 kWh 1494 kWh 640 kWh £395 £64 £459 £6,756 14.7 yrs £2,419
3 kW 3201 kWh 2241 kWh 960 kWh £592 £96 £688 £8,383 12.2 yrs £5,378
4 kW 4268 kWh 2988 kWh 1280 kWh £789 £128 £917 £10,011 10.9 yrs £8,337
5 kW 5335 kWh 3735 kWh 1601 kWh £987 £160 £1,147 £11,639 10.1 yrs £11,297
6 kW 6402 kWh 4482 kWh 1921 kWh £1,184 £192 £1,376 £13,267 9.6 yrs £14,256
7 kW 7469 kWh 5229 kWh 2241 kWh £1,381 £224 £1,605 £14,894 9.3 yrs £17,216
8 kW 8537 kWh 5976 kWh 2561 kWh £1,579 £256 £1,835 £16,522 9.0 yrs £20,175

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: £1,173, Upfront: £13,389, Break-even: 11.4 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2134 kWh 1558 kWh 576 kWh £412 £58 £469 £8,506 18.1 yrs £879
3 kW 3201 kWh 2337 kWh 864 kWh £617 £86 £704 £10,133 14.4 yrs £3,943
4 kW 4268 kWh 3116 kWh 1152 kWh £823 £115 £938 £11,761 12.5 yrs £7,008
5 kW 5335 kWh 3895 kWh 1441 kWh £1,029 £144 £1,173 £13,389 11.4 yrs £10,072
6 kW 6402 kWh 4674 kWh 1729 kWh £1,235 £173 £1,408 £15,017 10.7 yrs £13,137
7 kW 7469 kWh 5453 kWh 2017 kWh £1,441 £202 £1,642 £16,644 10.1 yrs £16,201
8 kW 8537 kWh 6232 kWh 2305 kWh £1,646 £230 £1,877 £18,272 9.7 yrs £19,266

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: £1,191, Upfront: £15,139, Break-even: 12.7 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2134 kWh 1601 kWh 534 kWh £423 £53 £476 £10,256 21.5 yrs £-731
3 kW 3201 kWh 2401 kWh 800 kWh £634 £80 £714 £11,883 16.6 yrs £2,404
4 kW 4268 kWh 3201 kWh 1067 kWh £846 £107 £952 £13,511 14.2 yrs £5,538
5 kW 5335 kWh 4002 kWh 1334 kWh £1,057 £133 £1,191 £15,139 12.7 yrs £8,673
6 kW 6402 kWh 4802 kWh 1601 kWh £1,269 £160 £1,429 £16,767 11.7 yrs £11,807
7 kW 7469 kWh 5602 kWh 1867 kWh £1,480 £187 £1,667 £18,394 11.0 yrs £14,942
8 kW 8537 kWh 6402 kWh 2134 kWh £1,692 £213 £1,905 £20,022 10.5 yrs £18,077

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: £1,208, 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 2134 kWh 1643 kWh 491 kWh £434 £49 £483 £12,706 26.3 yrs £-3,041
3 kW 3201 kWh 2465 kWh 736 kWh £651 £74 £725 £14,333 19.8 yrs £164
4 kW 4268 kWh 3287 kWh 982 kWh £868 £98 £966 £15,961 16.5 yrs £3,369
5 kW 5335 kWh 4108 kWh 1227 kWh £1,085 £123 £1,208 £17,589 14.6 yrs £6,573
6 kW 6402 kWh 4930 kWh 1473 kWh £1,302 £147 £1,450 £19,217 13.3 yrs £9,778
7 kW 7469 kWh 5752 kWh 1718 kWh £1,520 £172 £1,691 £20,844 12.3 yrs £12,983
8 kW 8537 kWh 6573 kWh 1963 kWh £1,737 £196 £1,933 £22,472 11.6 yrs £16,187

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 Isle of Wight

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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Understand DNO, G98 and G99 export limits

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Insights for PO31

Figures below are tailored to PO31 — click through for full league tables.

Big-Roof Britain Rank #882 of 2182
5.2 kWp (UK avg 5.1 kWp)
~11 panels (≈430 W)
Solar Payback Index Rank #171 of 2996
9.2 years (UK avg 10.8 years)
~£884 /yr • £8,139 upfront
Standing-Charge Drag Rank #657 of 2996
20.5% (UK avg 26.6%) drag on savings
£181 fixed • ~£884 /yr value
Aspect Penalty View ranking →
East −21.1% West −21.7%
Typical output loss versus a south-facing roof (lower is better)

Seasonal solar output in PO31

Monthly generation per kilowatt of solar panels

kWh 40 Jan 55 Feb 93 Mar 122 Apr 128 May 131 Jun 133 Jul 116 Aug 99 Sep 68 Oct 47 Nov 34 Dec
Best month Worst month Winter (Dec–Feb) Other months

Winter output: 48.6% 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 43 kWh per month; the average month produces around 89 kWh. So a typical 4 kW home system would generate roughly 173 kWh in winter, or 356 kWh in an average month.

Your Area at a Glance

Your Electricity Rate
26.42p/kWh
Daily Fixed Charge
49.70p/day
Local Sunshine
1067kWh/kW
A 1 kW system generates ~1067 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: 60% • Flats: 20% • Bungalows: 18% Based on 4,617 properties

Coverage

Isle of Wight (100%)

Areas Covered

Cowes North, Cowes West & Gurnard, Cowes Medina, Cowes South & Northwood, Newport Central, Brighstone, Calbourne & Shalfleet, Parkhurst & Hunnyhill

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

PO32 (Isle of Wight)
≈1.5 km away
Local sunshine: ~1,062 kWh/kWp · -0% vs PO31
PO30 (Isle of Wight)
≈6.4 km away
Local sunshine: ~1,133 kWh/kWp · +6% vs PO31
PO33 (Isle of Wight)
≈10.6 km away
Local sunshine: ~1,088 kWh/kWp · +2% vs PO31
PO13 (Gosport)
≈10.6 km away
Local sunshine: ~1,085 kWh/kWp · +2% vs PO31
PO14 (Fareham)
≈11.5 km away
Local sunshine: ~1,078 kWh/kWp · +1% vs PO31
PO12 (Gosport)
≈12.0 km away
Local sunshine: ~1,072 kWh/kWp · +0% vs PO31

Similar sunshine across the UK

TR20 (Cornwall)
~1,067 kWh/kWp · -0% vs PO31
TR17 (Cornwall)
~1,067 kWh/kWp · -0% vs PO31
TR27 (Cornwall)
~1,067 kWh/kWp · +0% vs PO31