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Solar panel cost in Isle of Wight (PO39)

See realistic solar installation costs, savings and payback for PO39 (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
11.9 years
After this, it's pure profit
Upfront Cost
£12,207
What you pay to get started
Annual Benefit
£1,025
What you save every year
Profit Over 25 Years
£13,409
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: Bigger systems don’t shorten payback—cost and savings rise together per kW.
  • 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

Costs: Battery prices are typically £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 23.36p/kWh with a 49.69p/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 23.4p and exported surplus at a baseline 10p via SEG. Use the calculator above for your exact tariff.

Unit rate
23.4p/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: £854, Upfront: £10,173, Break-even: 11.9 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2226 kWh 890 kWh 1336 kWh £208 £134 £342 £4,069 11.9 yrs £2,762
3 kW 3339 kWh 1336 kWh 2003 kWh £312 £200 £512 £6,104 11.9 yrs £4,143
4 kW 4452 kWh 1781 kWh 2671 kWh £416 £267 £683 £8,138 11.9 yrs £5,524
5 kW 5565 kWh 2226 kWh 3339 kWh £520 £334 £854 £10,173 11.9 yrs £6,905
6 kW 6678 kWh 2671 kWh 4007 kWh £624 £401 £1,025 £12,207 11.9 yrs £8,286
7 kW 7791 kWh 3116 kWh 4674 kWh £728 £467 £1,195 £14,242 11.9 yrs £9,667
8 kW 8904 kWh 3561 kWh 5342 kWh £832 £534 £1,366 £16,276 11.9 yrs £11,048

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 2,035, battery £/kWh = 700.

3 kWh battery 5 kW example → Annual benefit: £1,003, Upfront: £12,273, 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 2226 kWh 1336 kWh 890 kWh £312 £89 £401 £6,169 15.4 yrs £1,851
3 kW 3339 kWh 2003 kWh 1336 kWh £468 £134 £602 £8,204 13.6 yrs £3,827
4 kW 4452 kWh 2671 kWh 1781 kWh £624 £178 £802 £10,238 12.8 yrs £5,803
5 kW 5565 kWh 3339 kWh 2226 kWh £780 £223 £1,003 £12,273 12.2 yrs £7,779
6 kW 6678 kWh 4007 kWh 2671 kWh £936 £267 £1,203 £14,307 11.9 yrs £9,754
7 kW 7791 kWh 4674 kWh 3116 kWh £1,092 £312 £1,404 £16,342 11.6 yrs £11,730
8 kW 8904 kWh 5342 kWh 3561 kWh £1,248 £356 £1,604 £18,376 11.5 yrs £13,706

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 2,035, battery £/kWh = 700.

5 kWh battery 5 kW example → Annual benefit: £1,077, Upfront: £13,673, 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 2226 kWh 1558 kWh 668 kWh £364 £67 £431 £7,569 17.6 yrs £1,046
3 kW 3339 kWh 2337 kWh 1002 kWh £546 £100 £646 £9,604 14.9 yrs £3,319
4 kW 4452 kWh 3116 kWh 1336 kWh £728 £134 £862 £11,638 13.5 yrs £5,592
5 kW 5565 kWh 3895 kWh 1669 kWh £910 £167 £1,077 £13,673 12.7 yrs £7,865
6 kW 6678 kWh 4674 kWh 2003 kWh £1,092 £200 £1,292 £15,707 12.2 yrs £10,139
7 kW 7791 kWh 5454 kWh 2337 kWh £1,274 £234 £1,508 £17,742 11.8 yrs £12,412
8 kW 8904 kWh 6233 kWh 2671 kWh £1,456 £267 £1,723 £19,776 11.5 yrs £14,685

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 2,035, battery £/kWh = 700.

7.5 kWh battery 5 kW example → Annual benefit: £1,099, Upfront: £15,423, 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 2226 kWh 1625 kWh 601 kWh £380 £60 £440 £9,319 21.2 yrs £-525
3 kW 3339 kWh 2437 kWh 901 kWh £569 £90 £660 £11,354 17.2 yrs £1,837
4 kW 4452 kWh 3250 kWh 1202 kWh £759 £120 £879 £13,388 15.2 yrs £4,199
5 kW 5565 kWh 4062 kWh 1502 kWh £949 £150 £1,099 £15,423 14.0 yrs £6,562
6 kW 6678 kWh 4875 kWh 1803 kWh £1,139 £180 £1,319 £17,457 13.2 yrs £8,924
7 kW 7791 kWh 5687 kWh 2103 kWh £1,329 £210 £1,539 £19,492 12.7 yrs £11,286
8 kW 8904 kWh 6500 kWh 2404 kWh £1,518 £240 £1,759 £21,526 12.2 yrs £13,648

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 2,035, battery £/kWh = 700.

10 kWh battery 5 kW example → Annual benefit: £1,114, Upfront: £17,173, Break-even: 15.4 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2226 kWh 1669 kWh 556 kWh £390 £56 £446 £11,069 24.8 yrs £-2,156
3 kW 3339 kWh 2504 kWh 835 kWh £585 £83 £668 £13,104 19.6 yrs £265
4 kW 4452 kWh 3339 kWh 1113 kWh £780 £111 £891 £15,138 17.0 yrs £2,687
5 kW 5565 kWh 4174 kWh 1391 kWh £975 £139 £1,114 £17,173 15.4 yrs £5,109
6 kW 6678 kWh 5008 kWh 1669 kWh £1,170 £167 £1,337 £19,207 14.4 yrs £7,531
7 kW 7791 kWh 5843 kWh 1948 kWh £1,365 £195 £1,560 £21,242 13.6 yrs £9,952
8 kW 8904 kWh 6678 kWh 2226 kWh £1,560 £223 £1,783 £23,276 13.1 yrs £12,374

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 2,035, battery £/kWh = 700.

13.5 kWh battery 5 kW example → Annual benefit: £1,129, Upfront: £19,623, Break-even: 17.4 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2226 kWh 1714 kWh 512 kWh £400 £51 £452 £13,519 29.9 yrs £-4,487
3 kW 3339 kWh 2571 kWh 768 kWh £601 £77 £677 £15,554 23.0 yrs £-2,006
4 kW 4452 kWh 3428 kWh 1024 kWh £801 £102 £903 £17,588 19.5 yrs £475
5 kW 5565 kWh 4285 kWh 1280 kWh £1,001 £128 £1,129 £19,623 17.4 yrs £2,956
6 kW 6678 kWh 5142 kWh 1536 kWh £1,201 £154 £1,355 £21,657 16.0 yrs £5,438
7 kW 7791 kWh 5999 kWh 1792 kWh £1,401 £179 £1,581 £23,692 15.0 yrs £7,919
8 kW 8904 kWh 6856 kWh 2048 kWh £1,602 £205 £1,806 £25,726 14.2 yrs £10,400

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 2,035, 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.

Insights for PO39

Figures below are tailored to PO39 — click through for full league tables.

Big-Roof Britain Rank #219 of 2182
6.1 kWp (UK avg 5.1 kWp)
~13 panels (≈430 W)
Solar Payback Index Rank #66 of 2997
10.7 years (UK avg 12.6 years)
~£1,144 /yr • £12,207 upfront
Standing-Charge Drag Rank #8 of 2997
14.6% (UK avg 24.6%) drag on savings
£167 fixed • ~£1,144 /yr value
Aspect Penalty View ranking →
East −21.3% West −22.5%
Typical output loss versus a south-facing roof (lower is better)

Seasonal solar output in PO39

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: 48.6% 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 45 kWh per month; the average month produces around 93 kWh. So a typical 4 kW home system would generate roughly 180 kWh in winter, or 371 kWh in an average month.

Your Area at a Glance

Your Electricity Rate
23.36p/kWh
Daily Fixed Charge
49.69p/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: 45% • Flats: 24% • Bungalows: 28% Based on 899 properties

Coverage

Isle of Wight (100%)

Areas Covered

Totland & Colwell, Freshwater South

Data Sources & Assumptions

Solar yield: PVGIS (EU Joint Research Centre), January 2025 data

Electricity rates: Ofgem price cap, Q1 2026

Installation costs: MCS certified installer data, March 2025

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

PO40 (Isle of Wight)
≈1.0 km away
Local sunshine: ~1,113 kWh/kWp · +0% vs PO39
PO41 (Isle of Wight)
≈4.3 km away
Local sunshine: ~1,101 kWh/kWp · -1% vs PO39
SO41 (New Forest)
≈8.5 km away
Local sunshine: ~1,106 kWh/kWp · -1% vs PO39
BH25 (New Forest)
≈11.3 km away
Local sunshine: ~1,106 kWh/kWp · -1% vs PO39
SO42 (New Forest)
≈15.3 km away
Local sunshine: ~1,068 kWh/kWp · -4% vs PO39
PO30 (Isle of Wight)
≈17.2 km away
Local sunshine: ~1,133 kWh/kWp · +2% vs PO39

Similar sunshine across the UK

BN52 (Brighton and Hove)
~1,113 kWh/kWp · +0% vs PO39
BN3 (Brighton and Hove)
~1,113 kWh/kWp · -0% vs PO39
BN15 (Adur)
~1,112 kWh/kWp · -0% vs PO39