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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in PO40 (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
£1,108
What you save every year
Profit Over 25 Years
£15,501
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 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 26.5p 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)
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: £924, 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 2227 kWh 891 kWh 1336 kWh £236 £134 £369 £4,069 11.0 yrs £3,320
3 kW 3340 kWh 1336 kWh 2004 kWh £354 £200 £554 £6,104 11.0 yrs £4,980
4 kW 4453 kWh 1781 kWh 2672 kWh £472 £267 £739 £8,138 11.0 yrs £6,640
5 kW 5567 kWh 2227 kWh 3340 kWh £590 £334 £924 £10,173 11.0 yrs £8,300
6 kW 6680 kWh 2672 kWh 4008 kWh £708 £401 £1,108 £12,207 11.0 yrs £9,960
7 kW 7793 kWh 3117 kWh 4676 kWh £825 £468 £1,293 £14,242 11.0 yrs £11,620
8 kW 8907 kWh 3563 kWh 5344 kWh £943 £534 £1,478 £16,276 11.0 yrs £13,280

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: £1,107, 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 2227 kWh 1336 kWh 891 kWh £354 £89 £443 £6,169 13.9 yrs £2,688
3 kW 3340 kWh 2004 kWh 1336 kWh £531 £134 £664 £8,204 12.3 yrs £5,082
4 kW 4453 kWh 2672 kWh 1781 kWh £708 £178 £886 £10,238 11.6 yrs £7,475
5 kW 5567 kWh 3340 kWh 2227 kWh £884 £223 £1,107 £12,273 11.1 yrs £9,869
6 kW 6680 kWh 4008 kWh 2672 kWh £1,061 £267 £1,329 £14,307 10.8 yrs £12,263
7 kW 7793 kWh 4676 kWh 3117 kWh £1,238 £312 £1,550 £16,342 10.5 yrs £14,657
8 kW 8907 kWh 5344 kWh 3563 kWh £1,415 £356 £1,771 £18,376 10.4 yrs £17,051

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: £1,199, 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 2227 kWh 1559 kWh 668 kWh £413 £67 £480 £7,569 15.8 yrs £2,022
3 kW 3340 kWh 2338 kWh 1002 kWh £619 £100 £719 £9,604 13.4 yrs £4,782
4 kW 4453 kWh 3117 kWh 1336 kWh £825 £134 £959 £11,638 12.1 yrs £7,543
5 kW 5567 kWh 3897 kWh 1670 kWh £1,032 £167 £1,199 £13,673 11.4 yrs £10,304
6 kW 6680 kWh 4676 kWh 2004 kWh £1,238 £200 £1,439 £15,707 10.9 yrs £13,065
7 kW 7793 kWh 5455 kWh 2338 kWh £1,445 £234 £1,678 £17,742 10.6 yrs £15,826
8 kW 8907 kWh 6235 kWh 2672 kWh £1,651 £267 £1,918 £19,776 10.3 yrs £18,587

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: £1,226, 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 2227 kWh 1625 kWh 601 kWh £430 £60 £491 £9,319 19.0 yrs £492
3 kW 3340 kWh 2438 kWh 902 kWh £646 £90 £736 £11,354 15.4 yrs £3,363
4 kW 4453 kWh 3251 kWh 1202 kWh £861 £120 £981 £13,388 13.6 yrs £6,234
5 kW 5567 kWh 4064 kWh 1503 kWh £1,076 £150 £1,226 £15,423 12.6 yrs £9,105
6 kW 6680 kWh 4876 kWh 1804 kWh £1,291 £180 £1,472 £17,457 11.9 yrs £11,975
7 kW 7793 kWh 5689 kWh 2104 kWh £1,506 £210 £1,717 £19,492 11.4 yrs £14,846
8 kW 8907 kWh 6502 kWh 2405 kWh £1,722 £240 £1,962 £21,526 11.0 yrs £17,717

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: £1,245, 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 2227 kWh 1670 kWh 557 kWh £442 £56 £498 £11,069 22.2 yrs £-1,111
3 kW 3340 kWh 2505 kWh 835 kWh £663 £83 £747 £13,104 17.5 yrs £1,833
4 kW 4453 kWh 3340 kWh 1113 kWh £884 £111 £996 £15,138 15.2 yrs £4,777
5 kW 5567 kWh 4175 kWh 1392 kWh £1,106 £139 £1,245 £17,173 13.8 yrs £7,722
6 kW 6680 kWh 5010 kWh 1670 kWh £1,327 £167 £1,494 £19,207 12.9 yrs £10,666
7 kW 7793 kWh 5845 kWh 1948 kWh £1,548 £195 £1,743 £21,242 12.2 yrs £13,610
8 kW 8907 kWh 6680 kWh 2227 kWh £1,769 £223 £1,992 £23,276 11.7 yrs £16,554

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: £1,263, Upfront: £19,623, Break-even: 15.5 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 £454 £51 £505 £13,519 26.8 yrs £-3,415
3 kW 3340 kWh 2572 kWh 768 kWh £681 £77 £758 £15,554 20.5 yrs £-397
4 kW 4453 kWh 3429 kWh 1024 kWh £908 £102 £1,010 £17,588 17.4 yrs £2,621
5 kW 5567 kWh 4286 kWh 1280 kWh £1,135 £128 £1,263 £19,623 15.5 yrs £5,638
6 kW 6680 kWh 5144 kWh 1536 kWh £1,362 £154 £1,516 £21,657 14.3 yrs £8,656
7 kW 7793 kWh 6001 kWh 1792 kWh £1,589 £179 £1,768 £23,692 13.4 yrs £11,674
8 kW 8907 kWh 6858 kWh 2049 kWh £1,816 £205 £2,021 £25,726 12.7 yrs £14,692

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 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 #68 of 2997
9.6 years (UK avg 11.3 years)
~£1,273 /yr • £12,207 upfront
Standing-Charge Drag Rank #8 of 2997
12.8% (UK avg 21.7%) drag on savings
£163 fixed • ~£1,273 /yr value

Your Area at a Glance

Your Electricity Rate
26.48p/kWh
Daily Fixed Charge
44.62p/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, 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

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