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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in PO36 (Isle of Wight)

See if solar pays off for you in Isle of Wight — price, savings and payback in under a minute (official UK data).

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
11.0 years
After this, it's pure profit
Upfront Cost
£12,207
What you pay to get started
Annual Benefit
£1,106
What you save every year
Profit Over 25 Years
£15,431
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 26.48p/kWh with a 44.62p/day standing charge. Your postcode’s south-facing sunshine yield is 1110 kWh/kW — 109 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 1110 kWh per year on a south-facing roof. We value self-used electricity at 26.5p and exported surplus at a baseline 10p via SEG. Use the calculator above for your exact tariff.

Unit rate
26.5p/kWh
Standing charge
44.6p/day
Sunshine yield (south)
1110 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: £921, Upfront: £10,173, Break-even: 11.0 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2221 kWh 888 kWh 1333 kWh £235 £133 £369 £4,069 11.0 yrs £3,301
3 kW 3331 kWh 1333 kWh 1999 kWh £353 £200 £553 £6,104 11.0 yrs £4,952
4 kW 4442 kWh 1777 kWh 2665 kWh £470 £267 £737 £8,138 11.0 yrs £6,602
5 kW 5552 kWh 2221 kWh 3331 kWh £588 £333 £921 £10,173 11.0 yrs £8,253
6 kW 6663 kWh 2665 kWh 3998 kWh £706 £400 £1,106 £12,207 11.0 yrs £9,903
7 kW 7773 kWh 3109 kWh 4664 kWh £823 £466 £1,290 £14,242 11.0 yrs £11,554
8 kW 8884 kWh 3554 kWh 5330 kWh £941 £533 £1,474 £16,276 11.0 yrs £13,204

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: £1,104, Upfront: £12,273, Break-even: 11.1 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2221 kWh 1333 kWh 888 kWh £353 £89 £442 £6,169 14.0 yrs £2,665
3 kW 3331 kWh 1999 kWh 1333 kWh £529 £133 £663 £8,204 12.4 yrs £5,048
4 kW 4442 kWh 2665 kWh 1777 kWh £706 £178 £883 £10,238 11.6 yrs £7,430
5 kW 5552 kWh 3331 kWh 2221 kWh £882 £222 £1,104 £12,273 11.1 yrs £9,813
6 kW 6663 kWh 3998 kWh 2665 kWh £1,059 £267 £1,325 £14,307 10.8 yrs £12,195
7 kW 7773 kWh 4664 kWh 3109 kWh £1,235 £311 £1,546 £16,342 10.6 yrs £14,578
8 kW 8884 kWh 5330 kWh 3554 kWh £1,411 £355 £1,767 £18,376 10.4 yrs £16,961

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: £1,196, Upfront: £13,673, 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 2221 kWh 1555 kWh 666 kWh £412 £67 £478 £7,569 15.8 yrs £1,997
3 kW 3331 kWh 2332 kWh 999 kWh £618 £100 £717 £9,604 13.4 yrs £4,746
4 kW 4442 kWh 3109 kWh 1333 kWh £823 £133 £957 £11,638 12.2 yrs £7,494
5 kW 5552 kWh 3887 kWh 1666 kWh £1,029 £167 £1,196 £13,673 11.4 yrs £10,243
6 kW 6663 kWh 4664 kWh 1999 kWh £1,235 £200 £1,435 £15,707 10.9 yrs £12,992
7 kW 7773 kWh 5441 kWh 2332 kWh £1,441 £233 £1,674 £17,742 10.6 yrs £15,740
8 kW 8884 kWh 6219 kWh 2665 kWh £1,647 £267 £1,913 £19,776 10.3 yrs £18,489

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: £1,223, Upfront: £15,423, 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 2221 kWh 1621 kWh 600 kWh £429 £60 £489 £9,319 19.0 yrs £467
3 kW 3331 kWh 2432 kWh 899 kWh £644 £90 £734 £11,354 15.5 yrs £3,325
4 kW 4442 kWh 3243 kWh 1199 kWh £859 £120 £979 £13,388 13.7 yrs £6,184
5 kW 5552 kWh 4053 kWh 1499 kWh £1,073 £150 £1,223 £15,423 12.6 yrs £9,042
6 kW 6663 kWh 4864 kWh 1799 kWh £1,288 £180 £1,468 £17,457 11.9 yrs £11,900
7 kW 7773 kWh 5675 kWh 2099 kWh £1,503 £210 £1,713 £19,492 11.4 yrs £14,759
8 kW 8884 kWh 6485 kWh 2399 kWh £1,717 £240 £1,957 £21,526 11.0 yrs £17,617

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: £1,242, Upfront: £17,173, Break-even: 13.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2221 kWh 1666 kWh 555 kWh £441 £56 £497 £11,069 22.3 yrs £-1,137
3 kW 3331 kWh 2499 kWh 833 kWh £662 £83 £745 £13,104 17.6 yrs £1,795
4 kW 4442 kWh 3331 kWh 1110 kWh £882 £111 £993 £15,138 15.2 yrs £4,726
5 kW 5552 kWh 4164 kWh 1388 kWh £1,103 £139 £1,242 £17,173 13.8 yrs £7,658
6 kW 6663 kWh 4997 kWh 1666 kWh £1,323 £167 £1,490 £19,207 12.9 yrs £10,590
7 kW 7773 kWh 5830 kWh 1943 kWh £1,544 £194 £1,738 £21,242 12.2 yrs £13,521
8 kW 8884 kWh 6663 kWh 2221 kWh £1,764 £222 £1,986 £23,276 11.7 yrs £16,453

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: £1,260, Upfront: £19,623, Break-even: 15.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2221 kWh 1710 kWh 511 kWh £453 £51 £504 £13,519 26.8 yrs £-3,440
3 kW 3331 kWh 2565 kWh 766 kWh £679 £77 £756 £15,554 20.6 yrs £-436
4 kW 4442 kWh 3420 kWh 1022 kWh £906 £102 £1,008 £17,588 17.5 yrs £2,569
5 kW 5552 kWh 4275 kWh 1277 kWh £1,132 £128 £1,260 £19,623 15.6 yrs £5,574
6 kW 6663 kWh 5130 kWh 1532 kWh £1,359 £153 £1,512 £21,657 14.3 yrs £8,579
7 kW 7773 kWh 5986 kWh 1788 kWh £1,585 £179 £1,764 £23,692 13.4 yrs £11,584
8 kW 8884 kWh 6841 kWh 2043 kWh £1,811 £204 £2,016 £25,726 12.8 yrs £14,588

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 PO36

Figures below are tailored to PO36 — click through for full league tables.

Big-Roof Britain Rank #928 of 2182
5.1 kWp (UK avg 5.1 kWp)
~11 panels (≈430 W)
Solar Payback Index Rank #65 of 2997
9.6 years (UK avg 11.3 years)
~£1,270 /yr • £12,207 upfront
Standing-Charge Drag Rank #5 of 2997
12.8% (UK avg 21.7%) drag on savings
£163 fixed • ~£1,270 /yr value

Your Area at a Glance

Your Electricity Rate
26.48p/kWh
Daily Fixed Charge
44.62p/day
Local Sunshine
1110kWh/kW
A 1 kW system generates ~1110 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: 49% • Flats: 29% • Bungalows: 21% Based on 4,798 properties

Coverage

Isle of Wight (100%)

Areas Covered

Sandown South, Sandown North, Brading & St Helens, Lake North, Newchurch, Havenstreet & Ashey, Lake South, Bembridge + 1 more

Data Sources & Assumptions

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

Electricity rates: Ofgem price cap, Q4 2025

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

PO37 (Isle of Wight)
≈3.0 km away
Local sunshine: ~1,108 kWh/kWp · -0% vs PO36
PO35 (Isle of Wight)
≈6.1 km away
Local sunshine: ~1,111 kWh/kWp · +0% vs PO36
PO34 (Isle of Wight)
≈7.5 km away
Local sunshine: ~1,087 kWh/kWp · -2% vs PO36
PO33 (Isle of Wight)
≈7.7 km away
Local sunshine: ~1,088 kWh/kWp · -2% vs PO36
PO38 (Isle of Wight)
≈7.9 km away
Local sunshine: ~1,125 kWh/kWp · +1% vs PO36
PO30 (Isle of Wight)
≈11.0 km away
Local sunshine: ~1,133 kWh/kWp · +2% vs PO36

Similar sunshine across the UK

CT20 (Folkestone and Hythe)
~1,111 kWh/kWp · +0% vs PO36
BN41 (Brighton and Hove)
~1,110 kWh/kWp · -0% vs PO36
BN4 (Adur)
~1,110 kWh/kWp · -0% vs PO36