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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in GU29 (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
11.8 years
After this, it's pure profit
Upfront Cost
£12,207
What you pay to get started
Annual Benefit
£1,030
What you save every year
Profit Over 25 Years
£13,547
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 1035 kWh/kW — 34 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 1035 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)
1035 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: £858, Upfront: £10,173, Break-even: 11.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2070 kWh 828 kWh 1242 kWh £219 £124 £343 £4,069 11.8 yrs £2,799
3 kW 3104 kWh 1242 kWh 1863 kWh £329 £186 £515 £6,104 11.8 yrs £4,198
4 kW 4139 kWh 1656 kWh 2484 kWh £438 £248 £687 £8,138 11.8 yrs £5,597
5 kW 5174 kWh 2070 kWh 3104 kWh £548 £310 £858 £10,173 11.8 yrs £6,997
6 kW 6209 kWh 2484 kWh 3725 kWh £658 £373 £1,030 £12,207 11.8 yrs £8,396
7 kW 7244 kWh 2897 kWh 4346 kWh £767 £435 £1,202 £14,242 11.8 yrs £9,796
8 kW 8278 kWh 3311 kWh 4967 kWh £877 £497 £1,374 £16,276 11.8 yrs £11,195

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: £1,029, Upfront: £12,273, Break-even: 11.9 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2070 kWh 1242 kWh 828 kWh £329 £83 £412 £6,169 15.0 yrs £2,063
3 kW 3104 kWh 1863 kWh 1242 kWh £493 £124 £617 £8,204 13.3 yrs £4,145
4 kW 4139 kWh 2484 kWh 1656 kWh £658 £166 £823 £10,238 12.4 yrs £6,226
5 kW 5174 kWh 3104 kWh 2070 kWh £822 £207 £1,029 £12,273 11.9 yrs £8,308
6 kW 6209 kWh 3725 kWh 2484 kWh £986 £248 £1,235 £14,307 11.6 yrs £10,389
7 kW 7244 kWh 4346 kWh 2897 kWh £1,151 £290 £1,441 £16,342 11.3 yrs £12,471
8 kW 8278 kWh 4967 kWh 3311 kWh £1,315 £331 £1,646 £18,376 11.2 yrs £14,552

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: £1,114, Upfront: £13,673, 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 2070 kWh 1449 kWh 621 kWh £384 £62 £446 £7,569 17.0 yrs £1,345
3 kW 3104 kWh 2173 kWh 931 kWh £575 £93 £669 £9,604 14.4 yrs £3,768
4 kW 4139 kWh 2897 kWh 1242 kWh £767 £124 £891 £11,638 13.1 yrs £6,190
5 kW 5174 kWh 3622 kWh 1552 kWh £959 £155 £1,114 £13,673 12.3 yrs £8,613
6 kW 6209 kWh 4346 kWh 1863 kWh £1,151 £186 £1,337 £15,707 11.7 yrs £11,035
7 kW 7244 kWh 5071 kWh 2173 kWh £1,343 £217 £1,560 £17,742 11.4 yrs £13,458
8 kW 8278 kWh 5795 kWh 2484 kWh £1,534 £248 £1,783 £19,776 11.1 yrs £15,881

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: £1,140, Upfront: £15,423, 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 2070 kWh 1511 kWh 559 kWh £400 £56 £456 £9,319 20.4 yrs £-200
3 kW 3104 kWh 2266 kWh 838 kWh £600 £84 £684 £11,354 16.6 yrs £2,325
4 kW 4139 kWh 3022 kWh 1118 kWh £800 £112 £912 £13,388 14.7 yrs £4,850
5 kW 5174 kWh 3777 kWh 1397 kWh £1,000 £140 £1,140 £15,423 13.5 yrs £7,375
6 kW 6209 kWh 4532 kWh 1676 kWh £1,200 £168 £1,368 £17,457 12.8 yrs £9,899
7 kW 7244 kWh 5288 kWh 1956 kWh £1,400 £196 £1,596 £19,492 12.2 yrs £12,424
8 kW 8278 kWh 6043 kWh 2235 kWh £1,600 £224 £1,824 £21,526 11.8 yrs £14,949

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: £1,157, Upfront: £17,173, Break-even: 14.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2070 kWh 1552 kWh 517 kWh £411 £52 £463 £11,069 23.9 yrs £-1,814
3 kW 3104 kWh 2328 kWh 776 kWh £617 £78 £694 £13,104 18.9 yrs £779
4 kW 4139 kWh 3104 kWh 1035 kWh £822 £103 £926 £15,138 16.4 yrs £3,372
5 kW 5174 kWh 3880 kWh 1294 kWh £1,028 £129 £1,157 £17,173 14.8 yrs £5,966
6 kW 6209 kWh 4657 kWh 1552 kWh £1,233 £155 £1,388 £19,207 13.8 yrs £8,559
7 kW 7244 kWh 5433 kWh 1811 kWh £1,439 £181 £1,620 £21,242 13.1 yrs £11,152
8 kW 8278 kWh 6209 kWh 2070 kWh £1,644 £207 £1,851 £23,276 12.6 yrs £13,745

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: £1,174, Upfront: £19,623, Break-even: 16.7 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2070 kWh 1594 kWh 476 kWh £422 £48 £470 £13,519 28.8 yrs £-4,127
3 kW 3104 kWh 2390 kWh 714 kWh £633 £71 £704 £15,554 22.1 yrs £-1,466
4 kW 4139 kWh 3187 kWh 952 kWh £844 £95 £939 £17,588 18.7 yrs £1,195
5 kW 5174 kWh 3984 kWh 1190 kWh £1,055 £119 £1,174 £19,623 16.7 yrs £3,857
6 kW 6209 kWh 4781 kWh 1428 kWh £1,266 £143 £1,409 £21,657 15.4 yrs £6,518
7 kW 7244 kWh 5578 kWh 1666 kWh £1,477 £167 £1,644 £23,692 14.4 yrs £9,179
8 kW 8278 kWh 6374 kWh 1904 kWh £1,688 £190 £1,878 £25,726 13.7 yrs £11,841

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 GU29

Figures below are tailored to GU29 — click through for full league tables.

Big-Roof Britain Rank #760 of 2182
5.3 kWp (UK avg 5.1 kWp)
~11 panels (≈430 W)
Solar Payback Index Rank #325 of 2997
10.3 years (UK avg 11.3 years)
~£1,184 /yr • £12,207 upfront
Standing-Charge Drag Rank #73 of 2997
13.8% (UK avg 21.7%) drag on savings
£163 fixed • ~£1,184 /yr value

Your Area at a Glance

Your Electricity Rate
26.48p/kWh
Daily Fixed Charge
44.62p/day
Local Sunshine
1035kWh/kW
A 1 kW system generates ~1035 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: 62% • Flats: 25% • Bungalows: 11% Based on 3,104 properties

Coverage

Chichester (100%)

Areas Covered

Midhurst, Easebourne, Harting, Fernhurst, Fittleworth

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

GU28 (Chichester)
≈9.0 km away
Local sunshine: ~1,051 kWh/kWp · +2% vs GU29
GU30 (East Hampshire)
≈11.0 km away
Local sunshine: ~1,011 kWh/kWp · -2% vs GU29
GU27 (Waverley)
≈11.3 km away
Local sunshine: ~1,020 kWh/kWp · -1% vs GU29
GU33 (East Hampshire)
≈12.3 km away
Local sunshine: ~1,011 kWh/kWp · -2% vs GU29
GU31 (East Hampshire)
≈12.8 km away
Local sunshine: ~1,013 kWh/kWp · -2% vs GU29
GU32 (East Hampshire)
≈14.1 km away
Local sunshine: ~1,015 kWh/kWp · -2% vs GU29

Similar sunshine across the UK

CM3 (Chelmsford)
~1,035 kWh/kWp · +0% vs GU29
ME17 (Maidstone)
~1,034 kWh/kWp · -0% vs GU29
PE24 (East Lindsey)
~1,034 kWh/kWp · -0% vs GU29