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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in PO22 (Arun)

See if solar pays off for you in Arun — 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
10.9 years
After this, it's pure profit
Upfront Cost
£12,207
What you pay to get started
Annual Benefit
£1,123
What you save every year
Profit Over 25 Years
£15,873
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 1128 kWh/kW — 127 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 1128 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)
1128 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: £936, Upfront: £10,173, Break-even: 10.9 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2256 kWh 903 kWh 1354 kWh £239 £135 £374 £4,069 10.9 yrs £3,419
3 kW 3385 kWh 1354 kWh 2031 kWh £359 £203 £562 £6,104 10.9 yrs £5,128
4 kW 4513 kWh 1805 kWh 2708 kWh £478 £271 £749 £8,138 10.9 yrs £6,838
5 kW 5641 kWh 2256 kWh 3385 kWh £598 £338 £936 £10,173 10.9 yrs £8,547
6 kW 6769 kWh 2708 kWh 4062 kWh £717 £406 £1,123 £12,207 10.9 yrs £10,257
7 kW 7898 kWh 3159 kWh 4739 kWh £837 £474 £1,310 £14,242 10.9 yrs £11,966
8 kW 9026 kWh 3610 kWh 5416 kWh £956 £542 £1,498 £16,276 10.9 yrs £13,676

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: £1,122, Upfront: £12,273, Break-even: 10.9 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2256 kWh 1354 kWh 903 kWh £359 £90 £449 £6,169 13.7 yrs £2,806
3 kW 3385 kWh 2031 kWh 1354 kWh £538 £135 £673 £8,204 12.2 yrs £5,260
4 kW 4513 kWh 2708 kWh 1805 kWh £717 £181 £898 £10,238 11.4 yrs £7,713
5 kW 5641 kWh 3385 kWh 2256 kWh £896 £226 £1,122 £12,273 10.9 yrs £10,166
6 kW 6769 kWh 4062 kWh 2708 kWh £1,076 £271 £1,346 £14,307 10.6 yrs £12,619
7 kW 7898 kWh 4739 kWh 3159 kWh £1,255 £316 £1,571 £16,342 10.4 yrs £15,072
8 kW 9026 kWh 5416 kWh 3610 kWh £1,434 £361 £1,795 £18,376 10.2 yrs £17,525

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: £1,215, Upfront: £13,673, Break-even: 11.3 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2256 kWh 1580 kWh 677 kWh £418 £68 £486 £7,569 15.6 yrs £2,150
3 kW 3385 kWh 2369 kWh 1015 kWh £627 £102 £729 £9,604 13.2 yrs £4,975
4 kW 4513 kWh 3159 kWh 1354 kWh £837 £135 £972 £11,638 12.0 yrs £7,800
5 kW 5641 kWh 3949 kWh 1692 kWh £1,046 £169 £1,215 £13,673 11.3 yrs £10,625
6 kW 6769 kWh 4739 kWh 2031 kWh £1,255 £203 £1,458 £15,707 10.8 yrs £13,450
7 kW 7898 kWh 5528 kWh 2369 kWh £1,464 £237 £1,701 £17,742 10.4 yrs £16,275
8 kW 9026 kWh 6318 kWh 2708 kWh £1,673 £271 £1,944 £19,776 10.2 yrs £19,100

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: £1,243, Upfront: £15,423, Break-even: 12.4 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2256 kWh 1647 kWh 609 kWh £436 £61 £497 £9,319 18.7 yrs £623
3 kW 3385 kWh 2471 kWh 914 kWh £654 £91 £746 £11,354 15.2 yrs £3,560
4 kW 4513 kWh 3294 kWh 1218 kWh £872 £122 £994 £13,388 13.5 yrs £6,496
5 kW 5641 kWh 4118 kWh 1523 kWh £1,090 £152 £1,243 £15,423 12.4 yrs £9,433
6 kW 6769 kWh 4942 kWh 1828 kWh £1,309 £183 £1,491 £17,457 11.7 yrs £12,370
7 kW 7898 kWh 5765 kWh 2132 kWh £1,527 £213 £1,740 £19,492 11.2 yrs £15,306
8 kW 9026 kWh 6589 kWh 2437 kWh £1,745 £244 £1,988 £21,526 10.8 yrs £18,243

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: £1,261, Upfront: £17,173, Break-even: 13.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2256 kWh 1692 kWh 564 kWh £448 £56 £505 £11,069 21.9 yrs £-978
3 kW 3385 kWh 2539 kWh 846 kWh £672 £85 £757 £13,104 17.3 yrs £2,033
4 kW 4513 kWh 3385 kWh 1128 kWh £896 £113 £1,009 £15,138 15.0 yrs £5,044
5 kW 5641 kWh 4231 kWh 1410 kWh £1,120 £141 £1,261 £17,173 13.6 yrs £8,055
6 kW 6769 kWh 5077 kWh 1692 kWh £1,344 £169 £1,514 £19,207 12.7 yrs £11,066
7 kW 7898 kWh 5923 kWh 1974 kWh £1,568 £197 £1,766 £21,242 12.0 yrs £14,077
8 kW 9026 kWh 6769 kWh 2256 kWh £1,793 £226 £2,018 £23,276 11.5 yrs £17,088

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: £1,280, Upfront: £19,623, Break-even: 15.3 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2256 kWh 1737 kWh 519 kWh £460 £52 £512 £13,519 26.4 yrs £-3,279
3 kW 3385 kWh 2606 kWh 778 kWh £690 £78 £768 £15,554 20.3 yrs £-194
4 kW 4513 kWh 3475 kWh 1038 kWh £920 £104 £1,024 £17,588 17.2 yrs £2,891
5 kW 5641 kWh 4344 kWh 1297 kWh £1,150 £130 £1,280 £19,623 15.3 yrs £5,977
6 kW 6769 kWh 5212 kWh 1557 kWh £1,380 £156 £1,536 £21,657 14.1 yrs £9,062
7 kW 7898 kWh 6081 kWh 1816 kWh £1,610 £182 £1,792 £23,692 13.2 yrs £12,147
8 kW 9026 kWh 6950 kWh 2076 kWh £1,840 £208 £2,048 £25,726 12.6 yrs £15,233

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 PO22

Figures below are tailored to PO22 — click through for full league tables.

Big-Roof Britain Rank #741 of 2182
5.3 kWp (UK avg 5.1 kWp)
~11 panels (≈430 W)
Solar Payback Index Rank #50 of 2997
9.5 years (UK avg 11.3 years)
~£1,291 /yr • £12,207 upfront
Standing-Charge Drag Rank #1 of 2997
12.6% (UK avg 21.7%) drag on savings
£163 fixed • ~£1,291 /yr value

Your Area at a Glance

Your Electricity Rate
26.48p/kWh
Daily Fixed Charge
44.62p/day
Local Sunshine
1128kWh/kW
A 1 kW system generates ~1128 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: 56% • Flats: 17% • Bungalows: 22% Based on 8,324 properties

Coverage

Arun (100%)

Areas Covered

Felpham West, Felpham East, Middleton-on-Sea, Hotham, Barnham, Bersted, Orchard, Arundel & Walberton + 3 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

PO21 (Arun)
≈3.1 km away
Local sunshine: ~1,111 kWh/kWp · -2% vs PO22
BN18 (Arun)
≈8.1 km away
Local sunshine: ~1,106 kWh/kWp · -2% vs PO22
PO20 (Chichester)
≈9.5 km away
Local sunshine: ~1,122 kWh/kWp · -1% vs PO22
PO19 (Chichester)
≈10.3 km away
Local sunshine: ~1,138 kWh/kWp · +1% vs PO22
PO18 (Chichester)
≈14.0 km away
Local sunshine: ~1,108 kWh/kWp · -2% vs PO22
PO10 (Havant)
≈21.1 km away
Local sunshine: ~1,133 kWh/kWp · +0% vs PO22

Similar sunshine across the UK

BN16 (Arun)
~1,128 kWh/kWp · -0% vs PO22
BN23 (Eastbourne)
~1,126 kWh/kWp · -0% vs PO22
BN7 (Lewes)
~1,126 kWh/kWp · -0% vs PO22