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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in PO41 (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
£1,096
What you save every year
Profit Over 25 Years
£15,198
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 1101 kWh/kW — 100 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 1101 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)
1101 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: £913, 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 2202 kWh 881 kWh 1321 kWh £233 £132 £365 £4,069 11.1 yrs £3,239
3 kW 3303 kWh 1321 kWh 1982 kWh £350 £198 £548 £6,104 11.1 yrs £4,858
4 kW 4405 kWh 1762 kWh 2643 kWh £467 £264 £731 £8,138 11.1 yrs £6,478
5 kW 5506 kWh 2202 kWh 3303 kWh £583 £330 £913 £10,173 11.1 yrs £8,097
6 kW 6607 kWh 2643 kWh 3964 kWh £700 £396 £1,096 £12,207 11.1 yrs £9,717
7 kW 7708 kWh 3083 kWh 4625 kWh £816 £462 £1,279 £14,242 11.1 yrs £11,336
8 kW 8809 kWh 3524 kWh 5285 kWh £933 £529 £1,462 £16,276 11.1 yrs £12,956

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: £1,095, Upfront: £12,273, Break-even: 11.2 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2202 kWh 1321 kWh 881 kWh £350 £88 £438 £6,169 14.1 yrs £2,591
3 kW 3303 kWh 1982 kWh 1321 kWh £525 £132 £657 £8,204 12.5 yrs £4,936
4 kW 4405 kWh 2643 kWh 1762 kWh £700 £176 £876 £10,238 11.7 yrs £7,281
5 kW 5506 kWh 3303 kWh 2202 kWh £875 £220 £1,095 £12,273 11.2 yrs £9,627
6 kW 6607 kWh 3964 kWh 2643 kWh £1,050 £264 £1,314 £14,307 10.9 yrs £11,972
7 kW 7708 kWh 4625 kWh 3083 kWh £1,225 £308 £1,533 £16,342 10.7 yrs £14,317
8 kW 8809 kWh 5285 kWh 3524 kWh £1,400 £352 £1,752 £18,376 10.5 yrs £16,663

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: £1,186, 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 2202 kWh 1542 kWh 661 kWh £408 £66 £474 £7,569 16.0 yrs £1,917
3 kW 3303 kWh 2312 kWh 991 kWh £612 £99 £711 £9,604 13.5 yrs £4,625
4 kW 4405 kWh 3083 kWh 1321 kWh £816 £132 £949 £11,638 12.3 yrs £7,333
5 kW 5506 kWh 3854 kWh 1652 kWh £1,021 £165 £1,186 £13,673 11.5 yrs £10,041
6 kW 6607 kWh 4625 kWh 1982 kWh £1,225 £198 £1,423 £15,707 11.0 yrs £12,750
7 kW 7708 kWh 5396 kWh 2312 kWh £1,429 £231 £1,660 £17,742 10.7 yrs £15,458
8 kW 8809 kWh 6166 kWh 2643 kWh £1,633 £264 £1,897 £19,776 10.4 yrs £18,166

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: £1,213, Upfront: £15,423, 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 2202 kWh 1608 kWh 595 kWh £426 £59 £485 £9,319 19.2 yrs £384
3 kW 3303 kWh 2411 kWh 892 kWh £639 £89 £728 £11,354 15.6 yrs £3,201
4 kW 4405 kWh 3215 kWh 1189 kWh £851 £119 £970 £13,388 13.8 yrs £6,019
5 kW 5506 kWh 4019 kWh 1487 kWh £1,064 £149 £1,213 £15,423 12.7 yrs £8,836
6 kW 6607 kWh 4823 kWh 1784 kWh £1,277 £178 £1,456 £17,457 12.0 yrs £11,653
7 kW 7708 kWh 5627 kWh 2081 kWh £1,490 £208 £1,698 £19,492 11.5 yrs £14,470
8 kW 8809 kWh 6431 kWh 2378 kWh £1,703 £238 £1,941 £21,526 11.1 yrs £17,287

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: £1,231, 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 2202 kWh 1652 kWh 551 kWh £437 £55 £492 £11,069 22.5 yrs £-1,221
3 kW 3303 kWh 2478 kWh 826 kWh £656 £83 £739 £13,104 17.7 yrs £1,669
4 kW 4405 kWh 3303 kWh 1101 kWh £875 £110 £985 £15,138 15.4 yrs £4,559
5 kW 5506 kWh 4129 kWh 1376 kWh £1,093 £138 £1,231 £17,173 13.9 yrs £7,449
6 kW 6607 kWh 4955 kWh 1652 kWh £1,312 £165 £1,477 £19,207 13.0 yrs £10,338
7 kW 7708 kWh 5781 kWh 1927 kWh £1,531 £193 £1,723 £21,242 12.3 yrs £13,228
8 kW 8809 kWh 6607 kWh 2202 kWh £1,749 £220 £1,970 £23,276 11.8 yrs £16,118

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: £1,249, Upfront: £19,623, Break-even: 15.7 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2202 kWh 1696 kWh 507 kWh £449 £51 £500 £13,519 27.1 yrs £-3,525
3 kW 3303 kWh 2544 kWh 760 kWh £674 £76 £750 £15,554 20.8 yrs £-563
4 kW 4405 kWh 3391 kWh 1013 kWh £898 £101 £999 £17,588 17.6 yrs £2,399
5 kW 5506 kWh 4239 kWh 1266 kWh £1,123 £127 £1,249 £19,623 15.7 yrs £5,362
6 kW 6607 kWh 5087 kWh 1520 kWh £1,347 £152 £1,499 £21,657 14.4 yrs £8,324
7 kW 7708 kWh 5935 kWh 1773 kWh £1,572 £177 £1,749 £23,692 13.5 yrs £11,286
8 kW 8809 kWh 6783 kWh 2026 kWh £1,796 £203 £1,999 £25,726 12.9 yrs £14,249

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 PO41

Figures below are tailored to PO41 — click through for full league tables.

Big-Roof Britain Rank #172 of 2182
6.3 kWp (UK avg 5.1 kWp)
~13 panels (≈430 W)
Solar Payback Index Rank #103 of 2997
9.7 years (UK avg 11.3 years)
~£1,260 /yr • £12,207 upfront
Standing-Charge Drag Rank #14 of 2997
12.9% (UK avg 21.7%) drag on savings
£163 fixed • ~£1,260 /yr value

Your Area at a Glance

Your Electricity Rate
26.48p/kWh
Daily Fixed Charge
44.62p/day
Local Sunshine
1101kWh/kW
A 1 kW system generates ~1101 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: 63% • Flats: 9% • Bungalows: 27% Based on 833 properties

Coverage

Isle of Wight (100%)

Areas Covered

Freshwater North & Yarmouth, Brighstone, Calbourne & Shalfleet, Freshwater South, Newport Central

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

PO40 (Isle of Wight)
≈3.4 km away
Local sunshine: ~1,113 kWh/kWp · +1% vs PO41
PO39 (Isle of Wight)
≈4.3 km away
Local sunshine: ~1,113 kWh/kWp · +1% vs PO41
SO41 (New Forest)
≈7.2 km away
Local sunshine: ~1,106 kWh/kWp · +0% vs PO41
BH25 (New Forest)
≈12.8 km away
Local sunshine: ~1,106 kWh/kWp · +0% vs PO41
PO30 (Isle of Wight)
≈13.7 km away
Local sunshine: ~1,133 kWh/kWp · +3% vs PO41
SO42 (New Forest)
≈13.8 km away
Local sunshine: ~1,068 kWh/kWp · -3% vs PO41

Similar sunshine across the UK

TR23 (Isles of Scilly)
~1,101 kWh/kWp · -0% vs PO41
CO16 (Tendring)
~1,101 kWh/kWp · +0% vs PO41
CT13 (Dover)
~1,100 kWh/kWp · -0% vs PO41