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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in BN15 (Adur)

See if solar pays off for you in Adur — 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
£10,173
What you pay to get started
Annual Benefit
£932
What you save every year
Profit Over 25 Years
£13,135
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 1112 kWh/kW — 83 above the regional median (1029).

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 1112 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)
1112 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: £932, 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 2224 kWh 890 kWh 1334 kWh £239 £133 £373 £4,069 10.9 yrs £3,389
3 kW 3336 kWh 1334 kWh 2002 kWh £359 £200 £559 £6,104 10.9 yrs £5,084
4 kW 4448 kWh 1779 kWh 2669 kWh £479 £267 £746 £8,138 10.9 yrs £6,779
5 kW 5560 kWh 2224 kWh 3336 kWh £599 £334 £932 £10,173 10.9 yrs £8,473
6 kW 6672 kWh 2669 kWh 4003 kWh £718 £400 £1,119 £12,207 10.9 yrs £10,168
7 kW 7784 kWh 3114 kWh 4670 kWh £838 £467 £1,305 £14,242 10.9 yrs £11,863
8 kW 8896 kWh 3558 kWh 5338 kWh £958 £534 £1,492 £16,276 10.9 yrs £13,558

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: £1,120, Upfront: £12,273, Break-even: 11.0 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2224 kWh 1334 kWh 890 kWh £359 £89 £448 £6,169 13.8 yrs £2,795
3 kW 3336 kWh 2002 kWh 1334 kWh £539 £133 £672 £8,204 12.2 yrs £5,242
4 kW 4448 kWh 2669 kWh 1779 kWh £718 £178 £896 £10,238 11.4 yrs £7,689
5 kW 5560 kWh 3336 kWh 2224 kWh £898 £222 £1,120 £12,273 11.0 yrs £10,136
6 kW 6672 kWh 4003 kWh 2669 kWh £1,078 £267 £1,345 £14,307 10.6 yrs £12,584
7 kW 7784 kWh 4670 kWh 3114 kWh £1,257 £311 £1,569 £16,342 10.4 yrs £15,031
8 kW 8896 kWh 5338 kWh 3558 kWh £1,437 £356 £1,793 £18,376 10.3 yrs £17,478

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 2224 kWh 1557 kWh 667 kWh £419 £67 £486 £7,569 15.6 yrs £2,147
3 kW 3336 kWh 2335 kWh 1001 kWh £629 £100 £729 £9,604 13.2 yrs £4,971
4 kW 4448 kWh 3114 kWh 1334 kWh £838 £133 £972 £11,638 12.0 yrs £7,794
5 kW 5560 kWh 3892 kWh 1668 kWh £1,048 £167 £1,215 £13,673 11.3 yrs £10,618
6 kW 6672 kWh 4670 kWh 2002 kWh £1,257 £200 £1,457 £15,707 10.8 yrs £13,442
7 kW 7784 kWh 5449 kWh 2335 kWh £1,467 £234 £1,700 £17,742 10.4 yrs £16,265
8 kW 8896 kWh 6227 kWh 2669 kWh £1,676 £267 £1,943 £19,776 10.2 yrs £19,089

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 2224 kWh 1624 kWh 600 kWh £437 £60 £497 £9,319 18.7 yrs £623
3 kW 3336 kWh 2435 kWh 901 kWh £656 £90 £746 £11,354 15.2 yrs £3,559
4 kW 4448 kWh 3247 kWh 1201 kWh £874 £120 £994 £13,388 13.5 yrs £6,496
5 kW 5560 kWh 4059 kWh 1501 kWh £1,093 £150 £1,243 £15,423 12.4 yrs £9,432
6 kW 6672 kWh 4871 kWh 1801 kWh £1,311 £180 £1,491 £17,457 11.7 yrs £12,369
7 kW 7784 kWh 5682 kWh 2102 kWh £1,530 £210 £1,740 £19,492 11.2 yrs £15,305
8 kW 8896 kWh 6494 kWh 2402 kWh £1,748 £240 £1,988 £21,526 10.8 yrs £18,242

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: £1,262, 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 2224 kWh 1668 kWh 556 kWh £449 £56 £505 £11,069 21.9 yrs £-977
3 kW 3336 kWh 2502 kWh 834 kWh £674 £83 £757 £13,104 17.3 yrs £2,035
4 kW 4448 kWh 3336 kWh 1112 kWh £898 £111 £1,009 £15,138 15.0 yrs £5,047
5 kW 5560 kWh 4170 kWh 1390 kWh £1,123 £139 £1,262 £17,173 13.6 yrs £8,059
6 kW 6672 kWh 5004 kWh 1668 kWh £1,347 £167 £1,514 £19,207 12.7 yrs £11,070
7 kW 7784 kWh 5838 kWh 1946 kWh £1,572 £195 £1,766 £21,242 12.0 yrs £14,082
8 kW 8896 kWh 6672 kWh 2224 kWh £1,796 £222 £2,019 £23,276 11.5 yrs £17,094

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 2224 kWh 1712 kWh 512 kWh £461 £51 £512 £13,519 26.4 yrs £-3,276
3 kW 3336 kWh 2569 kWh 767 kWh £691 £77 £768 £15,554 20.2 yrs £-189
4 kW 4448 kWh 3425 kWh 1023 kWh £922 £102 £1,024 £17,588 17.2 yrs £2,898
5 kW 5560 kWh 4281 kWh 1279 kWh £1,152 £128 £1,280 £19,623 15.3 yrs £5,985
6 kW 6672 kWh 5137 kWh 1535 kWh £1,383 £153 £1,536 £21,657 14.1 yrs £9,072
7 kW 7784 kWh 5994 kWh 1790 kWh £1,613 £179 £1,793 £23,692 13.2 yrs £12,159
8 kW 8896 kWh 6850 kWh 2046 kWh £1,844 £205 £2,049 £25,726 12.6 yrs £15,246

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 BN15

Figures below are tailored to BN15 — click through for full league tables.

Big-Roof Britain Rank #818 of 2182
5.2 kWp (UK avg 5.1 kWp)
~11 panels (≈430 W)
Solar Payback Index Rank #36 of 2997
9.5 years (UK avg 11.3 years)
~£1,073 /yr • £10,173 upfront
Standing-Charge Drag Rank #590 of 2997
16.2% (UK avg 21.7%) drag on savings
£174 fixed • ~£1,073 /yr value

Your Area at a Glance

Your Electricity Rate
26.92p/kWh
Daily Fixed Charge
47.60p/day
Local Sunshine
1112kWh/kW
A 1 kW system generates ~1112 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: 45% • Flats: 27% • Bungalows: 25% Based on 7,135 properties

Coverage

Adur (100%)

Areas Covered

Mash Barn, Widewater, Churchill, Peverel, Manor, Cokeham, Selden, Marine

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

BN99 (Adur)
≈0.6 km away
Local sunshine: ~1,119 kWh/kWp · +1% vs BN15
BN95 (Adur)
≈0.8 km away
Local sunshine: ~1,112 kWh/kWp · -0% vs BN15
BN43 (Adur)
≈3.6 km away
Local sunshine: ~1,109 kWh/kWp · -0% vs BN15
BN11 (Worthing)
≈3.7 km away
Local sunshine: ~1,119 kWh/kWp · +1% vs BN15
BN14 (Worthing)
≈3.7 km away
Local sunshine: ~1,119 kWh/kWp · +1% vs BN15
BN4 (Adur)
≈5.4 km away
Local sunshine: ~1,110 kWh/kWp · -0% vs BN15

Similar sunshine across the UK

PO21 (Arun)
~1,111 kWh/kWp · -0% vs BN15
PO39 (Isle of Wight)
~1,113 kWh/kWp · +0% vs BN15
PO35 (Isle of Wight)
~1,111 kWh/kWp · -0% vs BN15