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Solar panel cost in Isle of Wight (PO40)

See realistic solar installation costs, savings and payback for PO40 (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
8.8 years
After this, it's pure profit
Upfront Cost
£9,767
What you pay to get started
Annual Benefit
£1,107
What you save every year
Profit Over 25 Years
£17,902
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 1113 kWh/kW — 112 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 1113 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)
1113 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: £922, Upfront: £8,139, Break-even: 8.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2227 kWh 891 kWh 1336 kWh £235 £134 £369 £3,256 8.8 yrs £4,123
3 kW 3340 kWh 1336 kWh 2004 kWh £353 £200 £553 £4,883 8.8 yrs £6,184
4 kW 4453 kWh 1781 kWh 2672 kWh £471 £267 £738 £6,511 8.8 yrs £8,245
5 kW 5567 kWh 2227 kWh 3340 kWh £588 £334 £922 £8,139 8.8 yrs £10,307
6 kW 6680 kWh 2672 kWh 4008 kWh £706 £401 £1,107 £9,767 8.8 yrs £12,368
7 kW 7793 kWh 3117 kWh 4676 kWh £824 £468 £1,291 £11,394 8.8 yrs £14,430
8 kW 8907 kWh 3563 kWh 5344 kWh £941 £534 £1,476 £13,022 8.8 yrs £16,491

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: £1,105, Upfront: £10,239, Break-even: 9.3 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2227 kWh 1336 kWh 891 kWh £353 £89 £442 £5,356 12.1 yrs £3,485
3 kW 3340 kWh 2004 kWh 1336 kWh £529 £134 £663 £6,983 10.5 yrs £6,278
4 kW 4453 kWh 2672 kWh 1781 kWh £706 £178 £884 £8,611 9.7 yrs £9,070
5 kW 5567 kWh 3340 kWh 2227 kWh £882 £223 £1,105 £10,239 9.3 yrs £11,863
6 kW 6680 kWh 4008 kWh 2672 kWh £1,059 £267 £1,326 £11,867 8.9 yrs £14,656
7 kW 7793 kWh 4676 kWh 3117 kWh £1,235 £312 £1,547 £13,494 8.7 yrs £17,448
8 kW 8907 kWh 5344 kWh 3563 kWh £1,412 £356 £1,768 £15,122 8.6 yrs £20,241

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: £1,196, Upfront: £11,639, 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 2227 kWh 1559 kWh 668 kWh £412 £67 £479 £6,756 14.1 yrs £2,816
3 kW 3340 kWh 2338 kWh 1002 kWh £618 £100 £718 £8,383 11.7 yrs £5,975
4 kW 4453 kWh 3117 kWh 1336 kWh £824 £134 £957 £10,011 10.5 yrs £9,133
5 kW 5567 kWh 3897 kWh 1670 kWh £1,029 £167 £1,196 £11,639 9.7 yrs £12,291
6 kW 6680 kWh 4676 kWh 2004 kWh £1,235 £200 £1,436 £13,267 9.2 yrs £15,449
7 kW 7793 kWh 5455 kWh 2338 kWh £1,441 £234 £1,675 £14,894 8.9 yrs £18,608
8 kW 8907 kWh 6235 kWh 2672 kWh £1,647 £267 £1,914 £16,522 8.6 yrs £21,766

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: £1,224, Upfront: £13,389, Break-even: 10.9 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2227 kWh 1625 kWh 601 kWh £429 £60 £490 £8,506 17.4 yrs £1,286
3 kW 3340 kWh 2438 kWh 902 kWh £644 £90 £734 £10,133 13.8 yrs £4,554
4 kW 4453 kWh 3251 kWh 1202 kWh £859 £120 £979 £11,761 12.0 yrs £7,822
5 kW 5567 kWh 4064 kWh 1503 kWh £1,074 £150 £1,224 £13,389 10.9 yrs £11,090
6 kW 6680 kWh 4876 kWh 1804 kWh £1,288 £180 £1,469 £15,017 10.2 yrs £14,357
7 kW 7793 kWh 5689 kWh 2104 kWh £1,503 £210 £1,713 £16,644 9.7 yrs £17,625
8 kW 8907 kWh 6502 kWh 2405 kWh £1,718 £240 £1,958 £18,272 9.3 yrs £20,893

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: £1,242, Upfront: £15,139, Break-even: 12.2 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2227 kWh 1670 kWh 557 kWh £441 £56 £497 £10,256 20.6 yrs £-318
3 kW 3340 kWh 2505 kWh 835 kWh £662 £83 £745 £11,883 15.9 yrs £3,023
4 kW 4453 kWh 3340 kWh 1113 kWh £882 £111 £994 £13,511 13.6 yrs £6,364
5 kW 5567 kWh 4175 kWh 1392 kWh £1,103 £139 £1,242 £15,139 12.2 yrs £9,705
6 kW 6680 kWh 5010 kWh 1670 kWh £1,324 £167 £1,491 £16,767 11.2 yrs £13,046
7 kW 7793 kWh 5845 kWh 1948 kWh £1,544 £195 £1,739 £18,394 10.6 yrs £16,387
8 kW 8907 kWh 6680 kWh 2227 kWh £1,765 £223 £1,988 £20,022 10.1 yrs £19,728

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: £1,260, Upfront: £17,589, Break-even: 14.0 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2227 kWh 1715 kWh 512 kWh £453 £51 £504 £12,706 25.2 yrs £-2,622
3 kW 3340 kWh 2572 kWh 768 kWh £679 £77 £756 £14,333 19.0 yrs £792
4 kW 4453 kWh 3429 kWh 1024 kWh £906 £102 £1,008 £15,961 15.8 yrs £4,207
5 kW 5567 kWh 4286 kWh 1280 kWh £1,132 £128 £1,260 £17,589 14.0 yrs £7,621
6 kW 6680 kWh 5144 kWh 1536 kWh £1,359 £154 £1,513 £19,217 12.7 yrs £11,035
7 kW 7793 kWh 6001 kWh 1792 kWh £1,585 £179 £1,765 £20,844 11.8 yrs £14,449
8 kW 8907 kWh 6858 kWh 2049 kWh £1,812 £205 £2,017 £22,472 11.1 yrs £17,863

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 PO40

Figures below are tailored to PO40 — click through for full league tables.

Big-Roof Britain Rank #516 of 2182
5.6 kWp (UK avg 5.1 kWp)
~12 panels (≈430 W)
Solar Payback Index Rank #54 of 2996
8.8 years (UK avg 10.8 years)
~£1,106 /yr • £9,767 upfront
Standing-Charge Drag Rank #19 of 2996
16.4% (UK avg 26.6%) drag on savings
£181 fixed • ~£1,106 /yr value
Aspect Penalty View ranking →
East −21.2% West −22.5%
Typical output loss versus a south-facing roof (lower is better)

Seasonal solar output in PO40

Monthly generation per kilowatt of solar panels

kWh 41 Jan 58 Feb 97 Mar 127 Apr 136 May 135 Jun 139 Jul 122 Aug 103 Sep 71 Oct 48 Nov 37 Dec
Best month Worst month Winter (Dec–Feb) Other months

Winter output: 48.7% 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 93 kWh. So a typical 4 kW home system would generate roughly 181 kWh in winter, or 371 kWh in an average month.

Your Area at a Glance

Your Electricity Rate
26.42p/kWh
Daily Fixed Charge
49.70p/day
Local Sunshine
1113kWh/kW
A 1 kW system generates ~1113 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: 48% • Flats: 24% • Bungalows: 27% Based on 2,104 properties

Coverage

Isle of Wight (100%)

Areas Covered

Freshwater South, Totland & Colwell, Freshwater North & Yarmouth

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

PO39 (Isle of Wight)
≈1.0 km away
Local sunshine: ~1,113 kWh/kWp · -0% vs PO40
PO41 (Isle of Wight)
≈3.4 km away
Local sunshine: ~1,101 kWh/kWp · -1% vs PO40
SO41 (New Forest)
≈8.5 km away
Local sunshine: ~1,106 kWh/kWp · -1% vs PO40
BH25 (New Forest)
≈12.0 km away
Local sunshine: ~1,106 kWh/kWp · -1% vs PO40
SO42 (New Forest)
≈15.3 km away
Local sunshine: ~1,068 kWh/kWp · -4% vs PO40
PO30 (Isle of Wight)
≈16.2 km away
Local sunshine: ~1,133 kWh/kWp · +2% vs PO40

Similar sunshine across the UK

BN52 (Brighton and Hove)
~1,113 kWh/kWp · -0% vs PO40
BN3 (Brighton and Hove)
~1,113 kWh/kWp · -0% vs PO40
BN15 (Adur)
~1,112 kWh/kWp · -0% vs PO40