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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in BN14 (Worthing)

See if solar pays off for you in Worthing — 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
£12,207
What you pay to get started
Annual Benefit
£1,126
What you save every year
Profit Over 25 Years
£15,949
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 South East, the current unit rate is 26.92p/kWh with a 47.60p/day standing charge. Your postcode’s south-facing sunshine yield is 1119 kWh/kW — 90 above the regional median (1029).

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 1119 kWh per year on a south-facing roof. We value self-used electricity at 26.9p and exported surplus at a baseline 10p via SEG. Use the calculator above for your exact tariff.

Unit rate
26.9p/kWh
Standing charge
47.6p/day
Sunshine yield (south)
1119 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: £939, 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 2239 kWh 896 kWh 1343 kWh £241 £134 £375 £4,069 10.8 yrs £3,439
3 kW 3358 kWh 1343 kWh 2015 kWh £362 £201 £563 £6,104 10.8 yrs £5,159
4 kW 4478 kWh 1791 kWh 2687 kWh £482 £269 £751 £8,138 10.8 yrs £6,878
5 kW 5597 kWh 2239 kWh 3358 kWh £603 £336 £939 £10,173 10.8 yrs £8,598
6 kW 6717 kWh 2687 kWh 4030 kWh £723 £403 £1,126 £12,207 10.8 yrs £10,318
7 kW 7836 kWh 3134 kWh 4702 kWh £844 £470 £1,314 £14,242 10.8 yrs £12,037
8 kW 8955 kWh 3582 kWh 5373 kWh £964 £537 £1,502 £16,276 10.8 yrs £13,757

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: £1,128, 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 2239 kWh 1343 kWh 896 kWh £362 £90 £451 £6,169 13.7 yrs £2,854
3 kW 3358 kWh 2015 kWh 1343 kWh £542 £134 £677 £8,204 12.1 yrs £5,332
4 kW 4478 kWh 2687 kWh 1791 kWh £723 £179 £902 £10,238 11.3 yrs £7,809
5 kW 5597 kWh 3358 kWh 2239 kWh £904 £224 £1,128 £12,273 10.9 yrs £10,286
6 kW 6717 kWh 4030 kWh 2687 kWh £1,085 £269 £1,354 £14,307 10.6 yrs £12,763
7 kW 7836 kWh 4702 kWh 3134 kWh £1,266 £313 £1,579 £16,342 10.3 yrs £15,241
8 kW 8955 kWh 5373 kWh 3582 kWh £1,446 £358 £1,805 £18,376 10.2 yrs £17,718

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: £1,223, 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 2239 kWh 1567 kWh 672 kWh £422 £67 £489 £7,569 15.5 yrs £2,212
3 kW 3358 kWh 2351 kWh 1007 kWh £633 £101 £734 £9,604 13.1 yrs £5,068
4 kW 4478 kWh 3134 kWh 1343 kWh £844 £134 £978 £11,638 11.9 yrs £7,924
5 kW 5597 kWh 3918 kWh 1679 kWh £1,055 £168 £1,223 £13,673 11.2 yrs £10,780
6 kW 6717 kWh 4702 kWh 2015 kWh £1,266 £201 £1,467 £15,707 10.7 yrs £13,636
7 kW 7836 kWh 5485 kWh 2351 kWh £1,477 £235 £1,712 £17,742 10.4 yrs £16,492
8 kW 8955 kWh 6269 kWh 2687 kWh £1,688 £269 £1,956 £19,776 10.1 yrs £19,348

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: £1,251, 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 2239 kWh 1634 kWh 604 kWh £440 £60 £500 £9,319 18.6 yrs £689
3 kW 3358 kWh 2452 kWh 907 kWh £660 £91 £751 £11,354 15.1 yrs £3,659
4 kW 4478 kWh 3269 kWh 1209 kWh £880 £121 £1,001 £13,388 13.4 yrs £6,629
5 kW 5597 kWh 4086 kWh 1511 kWh £1,100 £151 £1,251 £15,423 12.3 yrs £9,599
6 kW 6717 kWh 4903 kWh 1813 kWh £1,320 £181 £1,501 £17,457 11.6 yrs £12,568
7 kW 7836 kWh 5720 kWh 2116 kWh £1,540 £212 £1,751 £19,492 11.1 yrs £15,538
8 kW 8955 kWh 6537 kWh 2418 kWh £1,760 £242 £2,002 £21,526 10.8 yrs £18,508

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: £1,270, 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 2239 kWh 1679 kWh 560 kWh £452 £56 £508 £11,069 21.8 yrs £-909
3 kW 3358 kWh 2519 kWh 840 kWh £678 £84 £762 £13,104 17.2 yrs £2,136
4 kW 4478 kWh 3358 kWh 1119 kWh £904 £112 £1,016 £15,138 14.9 yrs £5,182
5 kW 5597 kWh 4198 kWh 1399 kWh £1,130 £140 £1,270 £17,173 13.5 yrs £8,227
6 kW 6717 kWh 5037 kWh 1679 kWh £1,356 £168 £1,524 £19,207 12.6 yrs £11,273
7 kW 7836 kWh 5877 kWh 1959 kWh £1,582 £196 £1,778 £21,242 11.9 yrs £14,318
8 kW 8955 kWh 6717 kWh 2239 kWh £1,808 £224 £2,032 £23,276 11.5 yrs £17,364

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: £1,289, 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 2239 kWh 1724 kWh 515 kWh £464 £51 £516 £13,519 26.2 yrs £-3,208
3 kW 3358 kWh 2586 kWh 772 kWh £696 £77 £773 £15,554 20.1 yrs £-86
4 kW 4478 kWh 3448 kWh 1030 kWh £928 £103 £1,031 £17,588 17.1 yrs £3,035
5 kW 5597 kWh 4310 kWh 1287 kWh £1,160 £129 £1,289 £19,623 15.2 yrs £6,156
6 kW 6717 kWh 5172 kWh 1545 kWh £1,392 £154 £1,547 £21,657 14.0 yrs £9,277
7 kW 7836 kWh 6034 kWh 1802 kWh £1,624 £180 £1,805 £23,692 13.1 yrs £12,399
8 kW 8955 kWh 6896 kWh 2060 kWh £1,856 £206 £2,062 £25,726 12.5 yrs £15,520

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 BN14

Figures below are tailored to BN14 — click through for full league tables.

Big-Roof Britain Rank #817 of 2182
5.2 kWp (UK avg 5.1 kWp)
~11 panels (≈430 W)
Solar Payback Index Rank #17 of 2997
9.4 years (UK avg 11.3 years)
~£1,297 /yr • £12,207 upfront
Standing-Charge Drag Rank #48 of 2997
13.4% (UK avg 21.7%) drag on savings
£174 fixed • ~£1,297 /yr value

Your Area at a Glance

Your Electricity Rate
26.92p/kWh
Daily Fixed Charge
47.60p/day
Local Sunshine
1119kWh/kW
A 1 kW system generates ~1119 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: 53% • Flats: 32% • Bungalows: 14% Based on 7,234 properties

Coverage

Worthing (91%)|Arun (9%)

Areas Covered

Broadwater, Gaisford, Offington, Central, Angmering & Findon, Tarring, Salvington, Peverel + 2 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 South East

BN11 (Worthing)
≈1.5 km away
Local sunshine: ~1,119 kWh/kWp · -0% vs BN14
BN13 (Worthing)
≈2.2 km away
Local sunshine: ~1,119 kWh/kWp · -0% vs BN14
BN99 (Adur)
≈3.2 km away
Local sunshine: ~1,119 kWh/kWp · -0% vs BN14
BN95 (Adur)
≈3.3 km away
Local sunshine: ~1,112 kWh/kWp · -1% vs BN14
BN12 (Worthing)
≈3.6 km away
Local sunshine: ~1,123 kWh/kWp · +0% vs BN14
BN15 (Adur)
≈3.7 km away
Local sunshine: ~1,112 kWh/kWp · -1% vs BN14

Similar sunshine across the UK

PO20 (Chichester)
~1,122 kWh/kWp · +0% vs BN14
TQ7 (South Hams)
~1,123 kWh/kWp · +0% vs BN14
TQ8 (South Hams)
~1,115 kWh/kWp · -0% vs BN14