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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in GU28 (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
11.7 years
After this, it's pure profit
Upfront Cost
£12,207
What you pay to get started
Annual Benefit
£1,046
What you save every year
Profit Over 25 Years
£13,945
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 1051 kWh/kW — 49 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 1051 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)
1051 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: £872, Upfront: £10,173, Break-even: 11.7 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2102 kWh 841 kWh 1261 kWh £223 £126 £349 £4,069 11.7 yrs £2,905
3 kW 3152 kWh 1261 kWh 1891 kWh £334 £189 £523 £6,104 11.7 yrs £4,357
4 kW 4203 kWh 1681 kWh 2522 kWh £445 £252 £697 £8,138 11.7 yrs £5,809
5 kW 5254 kWh 2102 kWh 3152 kWh £556 £315 £872 £10,173 11.7 yrs £7,262
6 kW 6305 kWh 2522 kWh 3783 kWh £668 £378 £1,046 £12,207 11.7 yrs £8,714
7 kW 7355 kWh 2942 kWh 4413 kWh £779 £441 £1,220 £14,242 11.7 yrs £10,167
8 kW 8406 kWh 3362 kWh 5044 kWh £890 £504 £1,395 £16,276 11.7 yrs £11,619

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: £1,045, Upfront: £12,273, Break-even: 11.7 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2102 kWh 1261 kWh 841 kWh £334 £84 £418 £6,169 14.8 yrs £2,190
3 kW 3152 kWh 1891 kWh 1261 kWh £501 £126 £627 £8,204 13.1 yrs £4,335
4 kW 4203 kWh 2522 kWh 1681 kWh £668 £168 £836 £10,238 12.2 yrs £6,480
5 kW 5254 kWh 3152 kWh 2102 kWh £835 £210 £1,045 £12,273 11.7 yrs £8,625
6 kW 6305 kWh 3783 kWh 2522 kWh £1,002 £252 £1,254 £14,307 11.4 yrs £10,770
7 kW 7355 kWh 4413 kWh 2942 kWh £1,169 £294 £1,463 £16,342 11.2 yrs £12,915
8 kW 8406 kWh 5044 kWh 3362 kWh £1,336 £336 £1,672 £18,376 11.0 yrs £15,060

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: £1,131, Upfront: £13,673, Break-even: 12.1 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2102 kWh 1471 kWh 630 kWh £390 £63 £453 £7,569 16.7 yrs £1,483
3 kW 3152 kWh 2207 kWh 946 kWh £584 £95 £679 £9,604 14.1 yrs £3,974
4 kW 4203 kWh 2942 kWh 1261 kWh £779 £126 £905 £11,638 12.9 yrs £6,465
5 kW 5254 kWh 3678 kWh 1576 kWh £974 £158 £1,131 £13,673 12.1 yrs £8,957
6 kW 6305 kWh 4413 kWh 1891 kWh £1,169 £189 £1,358 £15,707 11.6 yrs £11,448
7 kW 7355 kWh 5149 kWh 2207 kWh £1,363 £221 £1,584 £17,742 11.2 yrs £13,940
8 kW 8406 kWh 5884 kWh 2522 kWh £1,558 £252 £1,810 £19,776 10.9 yrs £16,431

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: £1,157, Upfront: £15,423, Break-even: 13.3 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2102 kWh 1534 kWh 567 kWh £406 £57 £463 £9,319 20.1 yrs £-59
3 kW 3152 kWh 2301 kWh 851 kWh £609 £85 £694 £11,354 16.3 yrs £2,536
4 kW 4203 kWh 3068 kWh 1135 kWh £812 £113 £926 £13,388 14.5 yrs £5,131
5 kW 5254 kWh 3835 kWh 1419 kWh £1,016 £142 £1,157 £15,423 13.3 yrs £7,726
6 kW 6305 kWh 4602 kWh 1702 kWh £1,219 £170 £1,389 £17,457 12.6 yrs £10,322
7 kW 7355 kWh 5369 kWh 1986 kWh £1,422 £199 £1,620 £19,492 12.0 yrs £12,917
8 kW 8406 kWh 6136 kWh 2270 kWh £1,625 £227 £1,852 £21,526 11.6 yrs £15,512

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: £1,175, Upfront: £17,173, Break-even: 14.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2102 kWh 1576 kWh 525 kWh £417 £53 £470 £11,069 23.6 yrs £-1,671
3 kW 3152 kWh 2364 kWh 788 kWh £626 £79 £705 £13,104 18.6 yrs £994
4 kW 4203 kWh 3152 kWh 1051 kWh £835 £105 £940 £15,138 16.1 yrs £3,658
5 kW 5254 kWh 3940 kWh 1313 kWh £1,043 £131 £1,175 £17,173 14.6 yrs £6,323
6 kW 6305 kWh 4728 kWh 1576 kWh £1,252 £158 £1,410 £19,207 13.6 yrs £8,987
7 kW 7355 kWh 5517 kWh 1839 kWh £1,461 £184 £1,645 £21,242 12.9 yrs £11,652
8 kW 8406 kWh 6305 kWh 2102 kWh £1,669 £210 £1,880 £23,276 12.4 yrs £14,316

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: £1,192, Upfront: £19,623, Break-even: 16.5 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2102 kWh 1618 kWh 483 kWh £428 £48 £477 £13,519 28.4 yrs £-3,982
3 kW 3152 kWh 2427 kWh 725 kWh £643 £73 £715 £15,554 21.7 yrs £-1,249
4 kW 4203 kWh 3236 kWh 967 kWh £857 £97 £954 £17,588 18.4 yrs £1,485
5 kW 5254 kWh 4045 kWh 1208 kWh £1,071 £121 £1,192 £19,623 16.5 yrs £4,219
6 kW 6305 kWh 4855 kWh 1450 kWh £1,285 £145 £1,430 £21,657 15.1 yrs £6,953
7 kW 7355 kWh 5664 kWh 1692 kWh £1,500 £169 £1,669 £23,692 14.2 yrs £9,687
8 kW 8406 kWh 6473 kWh 1933 kWh £1,714 £193 £1,907 £25,726 13.5 yrs £12,420

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 GU28

Figures below are tailored to GU28 — click through for full league tables.

Big-Roof Britain Rank #662 of 2182
5.4 kWp (UK avg 5.1 kWp)
~11 panels (≈430 W)
Solar Payback Index Rank #267 of 2997
10.2 years (UK avg 11.3 years)
~£1,202 /yr • £12,207 upfront
Standing-Charge Drag Rank #59 of 2997
13.5% (UK avg 21.7%) drag on savings
£163 fixed • ~£1,202 /yr value

Your Area at a Glance

Your Electricity Rate
26.48p/kWh
Daily Fixed Charge
44.62p/day
Local Sunshine
1051kWh/kW
A 1 kW system generates ~1051 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: 73% • Flats: 15% • Bungalows: 10% Based on 2,036 properties

Coverage

Chichester (100%)

Areas Covered

Petworth, Fittleworth, Loxwood, Easebourne, Fernhurst, Goodwood, Midhurst

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

GU29 (Chichester)
≈9.0 km away
Local sunshine: ~1,035 kWh/kWp · -2% vs GU28
RH14 (Horsham)
≈11.7 km away
Local sunshine: ~1,037 kWh/kWp · -1% vs GU28
GU27 (Waverley)
≈13.6 km away
Local sunshine: ~1,020 kWh/kWp · -3% vs GU28
BN18 (Arun)
≈15.1 km away
Local sunshine: ~1,106 kWh/kWp · +5% vs GU28
GU30 (East Hampshire)
≈16.7 km away
Local sunshine: ~1,011 kWh/kWp · -4% vs GU28
GU26 (Waverley)
≈16.9 km away
Local sunshine: ~1,005 kWh/kWp · -4% vs GU28

Similar sunshine across the UK

CM8 (Braintree)
~1,050 kWh/kWp · -0% vs GU28
SA73 (Pembrokeshire)
~1,051 kWh/kWp · +0% vs GU28
IP16 (East Suffolk)
~1,051 kWh/kWp · +0% vs GU28