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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in PO19 (Chichester)

See if solar pays off for you in Chichester — 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
10.8 years
After this, it's pure profit
Upfront Cost
£10,173
What you pay to get started
Annual Benefit
£944
What you save every year
Profit Over 25 Years
£13,420
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 1138 kWh/kW — 136 above the regional median (1001).

Read the full story

A typical roof here lands around 5.0 kW, with most eligible homes comfortably fitting within 3–6 kW. Each kilowatt of panels produces roughly 1138 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)
1138 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: £944, Upfront: £10,173, Break-even: 10.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2275 kWh 910 kWh 1365 kWh £241 £137 £377 £4,069 10.8 yrs £3,481
3 kW 3413 kWh 1365 kWh 2048 kWh £361 £205 £566 £6,104 10.8 yrs £5,221
4 kW 4550 kWh 1820 kWh 2730 kWh £482 £273 £755 £8,138 10.8 yrs £6,961
5 kW 5688 kWh 2275 kWh 3413 kWh £602 £341 £944 £10,173 10.8 yrs £8,702
6 kW 6825 kWh 2730 kWh 4095 kWh £723 £410 £1,132 £12,207 10.8 yrs £10,442
7 kW 7963 kWh 3185 kWh 4778 kWh £843 £478 £1,321 £14,242 10.8 yrs £12,183
8 kW 9100 kWh 3640 kWh 5460 kWh £964 £546 £1,510 £16,276 10.8 yrs £13,923

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: £1,131, Upfront: £12,273, Break-even: 10.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2275 kWh 1365 kWh 910 kWh £361 £91 £452 £6,169 13.6 yrs £2,880
3 kW 3413 kWh 2048 kWh 1365 kWh £542 £137 £679 £8,204 12.1 yrs £5,371
4 kW 4550 kWh 2730 kWh 1820 kWh £723 £182 £905 £10,238 11.3 yrs £7,861
5 kW 5688 kWh 3413 kWh 2275 kWh £904 £228 £1,131 £12,273 10.8 yrs £10,351
6 kW 6825 kWh 4095 kWh 2730 kWh £1,084 £273 £1,357 £14,307 10.5 yrs £12,841
7 kW 7963 kWh 4778 kWh 3185 kWh £1,265 £319 £1,584 £16,342 10.3 yrs £15,332
8 kW 9100 kWh 5460 kWh 3640 kWh £1,446 £364 £1,810 £18,376 10.2 yrs £17,822

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: £1,225, Upfront: £13,673, 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 2275 kWh 1593 kWh 683 kWh £422 £68 £490 £7,569 15.4 yrs £2,230
3 kW 3413 kWh 2389 kWh 1024 kWh £633 £102 £735 £9,604 13.1 yrs £5,096
4 kW 4550 kWh 3185 kWh 1365 kWh £843 £137 £980 £11,638 11.9 yrs £7,961
5 kW 5688 kWh 3981 kWh 1706 kWh £1,054 £171 £1,225 £13,673 11.2 yrs £10,826
6 kW 6825 kWh 4778 kWh 2048 kWh £1,265 £205 £1,470 £15,707 10.7 yrs £13,691
7 kW 7963 kWh 5574 kWh 2389 kWh £1,476 £239 £1,715 £17,742 10.3 yrs £16,556
8 kW 9100 kWh 6370 kWh 2730 kWh £1,687 £273 £1,960 £19,776 10.1 yrs £19,422

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: £1,253, Upfront: £15,423, Break-even: 12.3 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2275 kWh 1661 kWh 614 kWh £440 £61 £501 £9,319 18.6 yrs £705
3 kW 3413 kWh 2491 kWh 921 kWh £660 £92 £752 £11,354 15.1 yrs £3,683
4 kW 4550 kWh 3322 kWh 1229 kWh £880 £123 £1,002 £13,388 13.4 yrs £6,661
5 kW 5688 kWh 4152 kWh 1536 kWh £1,099 £154 £1,253 £15,423 12.3 yrs £9,638
6 kW 6825 kWh 4983 kWh 1843 kWh £1,319 £184 £1,504 £17,457 11.6 yrs £12,616
7 kW 7963 kWh 5813 kWh 2150 kWh £1,539 £215 £1,754 £19,492 11.1 yrs £15,594
8 kW 9100 kWh 6643 kWh 2457 kWh £1,759 £246 £2,005 £21,526 10.7 yrs £18,571

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: £1,272, Upfront: £17,173, Break-even: 13.5 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2275 kWh 1706 kWh 569 kWh £452 £57 £509 £11,069 21.8 yrs £-895
3 kW 3413 kWh 2560 kWh 853 kWh £678 £85 £763 £13,104 17.2 yrs £2,158
4 kW 4550 kWh 3413 kWh 1138 kWh £904 £114 £1,017 £15,138 14.9 yrs £5,211
5 kW 5688 kWh 4266 kWh 1422 kWh £1,130 £142 £1,272 £17,173 13.5 yrs £8,263
6 kW 6825 kWh 5119 kWh 1706 kWh £1,356 £171 £1,526 £19,207 12.6 yrs £11,316
7 kW 7963 kWh 5972 kWh 1991 kWh £1,581 £199 £1,781 £21,242 11.9 yrs £14,369
8 kW 9100 kWh 6825 kWh 2275 kWh £1,807 £228 £2,035 £23,276 11.4 yrs £17,421

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: £1,291, Upfront: £19,623, Break-even: 15.2 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2275 kWh 1752 kWh 523 kWh £464 £52 £516 £13,519 26.2 yrs £-3,195
3 kW 3413 kWh 2628 kWh 785 kWh £696 £78 £774 £15,554 20.1 yrs £-67
4 kW 4550 kWh 3504 kWh 1047 kWh £928 £105 £1,032 £17,588 17.0 yrs £3,061
5 kW 5688 kWh 4380 kWh 1308 kWh £1,160 £131 £1,291 £19,623 15.2 yrs £6,188
6 kW 6825 kWh 5256 kWh 1570 kWh £1,392 £157 £1,549 £21,657 14.0 yrs £9,316
7 kW 7963 kWh 6131 kWh 1831 kWh £1,624 £183 £1,807 £23,692 13.1 yrs £12,444
8 kW 9100 kWh 7007 kWh 2093 kWh £1,856 £209 £2,065 £25,726 12.5 yrs £15,571

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 PO19

Figures below are tailored to PO19 — click through for full league tables.

Big-Roof Britain Rank #1441 of 2182
4.7 kWp (UK avg 5.1 kWp)
~10 panels (≈430 W)
Solar Payback Index Rank #26 of 2997
9.4 years (UK avg 11.3 years)
~£1,084 /yr • £10,173 upfront
Standing-Charge Drag Rank #242 of 2997
15.0% (UK avg 21.7%) drag on savings
£163 fixed • ~£1,084 /yr value

Your Area at a Glance

Your Electricity Rate
26.48p/kWh
Daily Fixed Charge
44.62p/day
Local Sunshine
1138kWh/kW
A 1 kW system generates ~1138 kWh per year. A typical home uses ~2,700 kWh per year.
Typical System Size
5.0kW
For houses & bungalows in this area

Local Property Data

Property Types

Houses: 56% • Flats: 35% • Bungalows: 6% Based on 11,640 properties

Coverage

Chichester (100%)

Areas Covered

Chichester Central, Chichester South, Chichester East, Chichester North, Chichester West, Harbour Villages, North Mundham & Tangmere, Lavant + 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

PO20 (Chichester)
≈3.0 km away
Local sunshine: ~1,122 kWh/kWp · -1% vs PO19
PO18 (Chichester)
≈3.7 km away
Local sunshine: ~1,108 kWh/kWp · -3% vs PO19
PO21 (Arun)
≈8.6 km away
Local sunshine: ~1,111 kWh/kWp · -2% vs PO19
PO22 (Arun)
≈10.3 km away
Local sunshine: ~1,128 kWh/kWp · -1% vs PO19
PO10 (Havant)
≈11.0 km away
Local sunshine: ~1,133 kWh/kWp · -0% vs PO19
PO9 (Havant)
≈14.4 km away
Local sunshine: ~1,096 kWh/kWp · -4% vs PO19

Similar sunshine across the UK

BN22 (Eastbourne)
~1,138 kWh/kWp · +0% vs PO19
BN51 (Brighton and Hove)
~1,137 kWh/kWp · -0% vs PO19
BN9 (Lewes)
~1,138 kWh/kWp · +0% vs PO19