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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in PO37 (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
11.1 years
After this, it's pure profit
Upfront Cost
£12,207
What you pay to get started
Annual Benefit
£1,103
What you save every year
Profit Over 25 Years
£15,377
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 1108 kWh/kW — 107 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 1108 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)
1108 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: £919, Upfront: £10,173, 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 2217 kWh 887 kWh 1330 kWh £235 £133 £368 £4,069 11.1 yrs £3,287
3 kW 3325 kWh 1330 kWh 1995 kWh £352 £200 £552 £6,104 11.1 yrs £4,930
4 kW 4433 kWh 1773 kWh 2660 kWh £470 £266 £736 £8,138 11.1 yrs £6,574
5 kW 5542 kWh 2217 kWh 3325 kWh £587 £333 £919 £10,173 11.1 yrs £8,217
6 kW 6650 kWh 2660 kWh 3990 kWh £704 £399 £1,103 £12,207 11.1 yrs £9,860
7 kW 7758 kWh 3103 kWh 4655 kWh £822 £466 £1,287 £14,242 11.1 yrs £11,504
8 kW 8867 kWh 3547 kWh 5320 kWh £939 £532 £1,471 £16,276 11.1 yrs £13,147

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: £1,102, 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 2217 kWh 1330 kWh 887 kWh £352 £89 £441 £6,169 14.0 yrs £2,648
3 kW 3325 kWh 1995 kWh 1330 kWh £528 £133 £661 £8,204 12.4 yrs £5,022
4 kW 4433 kWh 2660 kWh 1773 kWh £704 £177 £882 £10,238 11.6 yrs £7,396
5 kW 5542 kWh 3325 kWh 2217 kWh £880 £222 £1,102 £12,273 11.1 yrs £9,770
6 kW 6650 kWh 3990 kWh 2660 kWh £1,057 £266 £1,323 £14,307 10.8 yrs £12,144
7 kW 7758 kWh 4655 kWh 3103 kWh £1,233 £310 £1,543 £16,342 10.6 yrs £14,518
8 kW 8867 kWh 5320 kWh 3547 kWh £1,409 £355 £1,763 £18,376 10.4 yrs £16,892

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: £1,193, Upfront: £13,673, Break-even: 11.5 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2217 kWh 1552 kWh 665 kWh £411 £67 £477 £7,569 15.9 yrs £1,979
3 kW 3325 kWh 2328 kWh 998 kWh £616 £100 £716 £9,604 13.4 yrs £4,718
4 kW 4433 kWh 3103 kWh 1330 kWh £822 £133 £955 £11,638 12.2 yrs £7,457
5 kW 5542 kWh 3879 kWh 1663 kWh £1,027 £166 £1,193 £13,673 11.5 yrs £10,197
6 kW 6650 kWh 4655 kWh 1995 kWh £1,233 £200 £1,432 £15,707 11.0 yrs £12,936
7 kW 7758 kWh 5431 kWh 2328 kWh £1,438 £233 £1,671 £17,742 10.6 yrs £15,675
8 kW 8867 kWh 6207 kWh 2660 kWh £1,644 £266 £1,910 £19,776 10.4 yrs £18,415

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: £1,221, 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 2217 kWh 1618 kWh 599 kWh £428 £60 £488 £9,319 19.1 yrs £448
3 kW 3325 kWh 2427 kWh 898 kWh £643 £90 £733 £11,354 15.5 yrs £3,297
4 kW 4433 kWh 3236 kWh 1197 kWh £857 £120 £977 £13,388 13.7 yrs £6,146
5 kW 5542 kWh 4045 kWh 1496 kWh £1,071 £150 £1,221 £15,423 12.6 yrs £8,995
6 kW 6650 kWh 4855 kWh 1796 kWh £1,285 £180 £1,465 £17,457 11.9 yrs £11,844
7 kW 7758 kWh 5664 kWh 2095 kWh £1,500 £209 £1,709 £19,492 11.4 yrs £14,692
8 kW 8867 kWh 6473 kWh 2394 kWh £1,714 £239 £1,953 £21,526 11.0 yrs £17,541

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: £1,239, Upfront: £17,173, Break-even: 13.9 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2217 kWh 1663 kWh 554 kWh £440 £55 £496 £11,069 22.3 yrs £-1,156
3 kW 3325 kWh 2494 kWh 831 kWh £660 £83 £743 £13,104 17.6 yrs £1,766
4 kW 4433 kWh 3325 kWh 1108 kWh £880 £111 £991 £15,138 15.3 yrs £4,688
5 kW 5542 kWh 4156 kWh 1385 kWh £1,101 £139 £1,239 £17,173 13.9 yrs £7,610
6 kW 6650 kWh 4988 kWh 1663 kWh £1,321 £166 £1,487 £19,207 12.9 yrs £10,532
7 kW 7758 kWh 5819 kWh 1940 kWh £1,541 £194 £1,735 £21,242 12.2 yrs £13,454
8 kW 8867 kWh 6650 kWh 2217 kWh £1,761 £222 £1,983 £23,276 11.7 yrs £16,376

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: £1,257, 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 2217 kWh 1707 kWh 510 kWh £452 £51 £503 £13,519 26.9 yrs £-3,460
3 kW 3325 kWh 2560 kWh 765 kWh £678 £76 £754 £15,554 20.6 yrs £-465
4 kW 4433 kWh 3414 kWh 1020 kWh £904 £102 £1,006 £17,588 17.5 yrs £2,530
5 kW 5542 kWh 4267 kWh 1275 kWh £1,130 £127 £1,257 £19,623 15.6 yrs £5,525
6 kW 6650 kWh 5121 kWh 1530 kWh £1,356 £153 £1,509 £21,657 14.4 yrs £8,520
7 kW 7758 kWh 5974 kWh 1784 kWh £1,582 £178 £1,760 £23,692 13.5 yrs £11,515
8 kW 8867 kWh 6827 kWh 2039 kWh £1,808 £204 £2,012 £25,726 12.8 yrs £14,510

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 PO37

Figures below are tailored to PO37 — click through for full league tables.

Big-Roof Britain Rank #1238 of 2182
4.9 kWp (UK avg 5.1 kWp)
~10 panels (≈430 W)
Solar Payback Index Rank #66 of 2997
9.6 years (UK avg 11.3 years)
~£1,268 /yr • £12,207 upfront
Standing-Charge Drag Rank #4 of 2997
12.8% (UK avg 21.7%) drag on savings
£163 fixed • ~£1,268 /yr value

Your Area at a Glance

Your Electricity Rate
26.48p/kWh
Daily Fixed Charge
44.62p/day
Local Sunshine
1108kWh/kW
A 1 kW system generates ~1108 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: 39% • Flats: 45% • Bungalows: 14% Based on 3,081 properties

Coverage

Isle of Wight (100%)

Areas Covered

Shanklin South, Shanklin Central, Lake South, Sandown South, Newchurch, Havenstreet & Ashey

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

PO36 (Isle of Wight)
≈3.0 km away
Local sunshine: ~1,110 kWh/kWp · +0% vs PO37
PO38 (Isle of Wight)
≈5.0 km away
Local sunshine: ~1,125 kWh/kWp · +2% vs PO37
PO35 (Isle of Wight)
≈8.9 km away
Local sunshine: ~1,111 kWh/kWp · +0% vs PO37
PO33 (Isle of Wight)
≈10.3 km away
Local sunshine: ~1,088 kWh/kWp · -2% vs PO37
PO34 (Isle of Wight)
≈10.5 km away
Local sunshine: ~1,087 kWh/kWp · -2% vs PO37
PO30 (Isle of Wight)
≈11.2 km away
Local sunshine: ~1,133 kWh/kWp · +2% vs PO37

Similar sunshine across the UK

BN43 (Adur)
~1,109 kWh/kWp · +0% vs PO37
CT15 (Dover)
~1,110 kWh/kWp · +0% vs PO37
BN42 (Adur)
~1,110 kWh/kWp · +0% vs PO37