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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in BN24 (Wealden)

See if solar pays off for you in Wealden — 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
10.7 years
After this, it's pure profit
Upfront Cost
£12,207
What you pay to get started
Annual Benefit
£1,144
What you save every year
Profit Over 25 Years
£16,386
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 1137 kWh/kW — 108 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 1137 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)
1137 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: £953, Upfront: £10,173, Break-even: 10.7 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2274 kWh 909 kWh 1364 kWh £245 £136 £381 £4,069 10.7 yrs £3,556
3 kW 3410 kWh 1364 kWh 2046 kWh £367 £205 £572 £6,104 10.7 yrs £5,334
4 kW 4547 kWh 1819 kWh 2728 kWh £490 £273 £762 £8,138 10.7 yrs £7,112
5 kW 5684 kWh 2274 kWh 3410 kWh £612 £341 £953 £10,173 10.7 yrs £8,890
6 kW 6821 kWh 2728 kWh 4093 kWh £734 £409 £1,144 £12,207 10.7 yrs £10,668
7 kW 7958 kWh 3183 kWh 4775 kWh £857 £477 £1,334 £14,242 10.7 yrs £12,446
8 kW 9095 kWh 3638 kWh 5457 kWh £979 £546 £1,525 £16,276 10.7 yrs £14,223

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: £1,145, Upfront: £12,273, Break-even: 10.7 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2274 kWh 1364 kWh 909 kWh £367 £91 £458 £6,169 13.5 yrs £2,995
3 kW 3410 kWh 2046 kWh 1364 kWh £551 £136 £687 £8,204 11.9 yrs £5,542
4 kW 4547 kWh 2728 kWh 1819 kWh £734 £182 £916 £10,238 11.2 yrs £8,089
5 kW 5684 kWh 3410 kWh 2274 kWh £918 £227 £1,145 £12,273 10.7 yrs £10,637
6 kW 6821 kWh 4093 kWh 2728 kWh £1,102 £273 £1,375 £14,307 10.4 yrs £13,184
7 kW 7958 kWh 4775 kWh 3183 kWh £1,285 £318 £1,604 £16,342 10.2 yrs £15,731
8 kW 9095 kWh 5457 kWh 3638 kWh £1,469 £364 £1,833 £18,376 10.0 yrs £18,279

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: £1,242, Upfront: £13,673, 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 2274 kWh 1592 kWh 682 kWh £428 £68 £497 £7,569 15.2 yrs £2,364
3 kW 3410 kWh 2387 kWh 1023 kWh £643 £102 £745 £9,604 12.9 yrs £5,296
4 kW 4547 kWh 3183 kWh 1364 kWh £857 £136 £993 £11,638 11.7 yrs £8,228
5 kW 5684 kWh 3979 kWh 1705 kWh £1,071 £171 £1,242 £13,673 11.0 yrs £11,160
6 kW 6821 kWh 4775 kWh 2046 kWh £1,285 £205 £1,490 £15,707 10.5 yrs £14,092
7 kW 7958 kWh 5570 kWh 2387 kWh £1,500 £239 £1,738 £17,742 10.2 yrs £17,024
8 kW 9095 kWh 6366 kWh 2728 kWh £1,714 £273 £1,987 £19,776 10.0 yrs £19,956

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: £1,270, Upfront: £15,423, 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 2274 kWh 1660 kWh 614 kWh £447 £61 £508 £9,319 18.3 yrs £845
3 kW 3410 kWh 2490 kWh 921 kWh £670 £92 £762 £11,354 14.9 yrs £3,892
4 kW 4547 kWh 3320 kWh 1228 kWh £894 £123 £1,016 £13,388 13.2 yrs £6,940
5 kW 5684 kWh 4149 kWh 1535 kWh £1,117 £153 £1,270 £15,423 12.1 yrs £9,987
6 kW 6821 kWh 4979 kWh 1842 kWh £1,340 £184 £1,525 £17,457 11.5 yrs £13,035
7 kW 7958 kWh 5809 kWh 2149 kWh £1,564 £215 £1,779 £19,492 11.0 yrs £16,082
8 kW 9095 kWh 6639 kWh 2456 kWh £1,787 £246 £2,033 £21,526 10.6 yrs £19,130

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: £1,290, Upfront: £17,173, 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 2274 kWh 1705 kWh 568 kWh £459 £57 £516 £11,069 21.5 yrs £-751
3 kW 3410 kWh 2558 kWh 853 kWh £689 £85 £774 £13,104 16.9 yrs £2,373
4 kW 4547 kWh 3410 kWh 1137 kWh £918 £114 £1,032 £15,138 14.7 yrs £5,498
5 kW 5684 kWh 4263 kWh 1421 kWh £1,148 £142 £1,290 £17,173 13.3 yrs £8,622
6 kW 6821 kWh 5116 kWh 1705 kWh £1,377 £171 £1,548 £19,207 12.4 yrs £11,746
7 kW 7958 kWh 5968 kWh 1989 kWh £1,607 £199 £1,806 £21,242 11.8 yrs £14,871
8 kW 9095 kWh 6821 kWh 2274 kWh £1,836 £227 £2,064 £23,276 11.3 yrs £17,995

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: £1,309, Upfront: £19,623, Break-even: 15.0 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2274 kWh 1751 kWh 523 kWh £471 £52 £524 £13,519 25.8 yrs £-3,047
3 kW 3410 kWh 2626 kWh 784 kWh £707 £78 £785 £15,554 19.8 yrs £154
4 kW 4547 kWh 3501 kWh 1046 kWh £943 £105 £1,047 £17,588 16.8 yrs £3,355
5 kW 5684 kWh 4377 kWh 1307 kWh £1,178 £131 £1,309 £19,623 15.0 yrs £6,557
6 kW 6821 kWh 5252 kWh 1569 kWh £1,414 £157 £1,571 £21,657 13.8 yrs £9,758
7 kW 7958 kWh 6127 kWh 1830 kWh £1,650 £183 £1,833 £23,692 12.9 yrs £12,959
8 kW 9095 kWh 7003 kWh 2092 kWh £1,885 £209 £2,094 £25,726 12.3 yrs £16,161

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 BN24

Figures below are tailored to BN24 — click through for full league tables.

Big-Roof Britain Rank #531 of 2182
5.6 kWp (UK avg 5.1 kWp)
~12 panels (≈430 W)
Solar Payback Index Rank #6 of 2997
9.3 years (UK avg 11.3 years)
~£1,317 /yr • £12,207 upfront
Standing-Charge Drag Rank #31 of 2997
13.2% (UK avg 21.7%) drag on savings
£174 fixed • ~£1,317 /yr value

Your Area at a Glance

Your Electricity Rate
26.92p/kWh
Daily Fixed Charge
47.60p/day
Local Sunshine
1137kWh/kW
A 1 kW system generates ~1137 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: 12% • Bungalows: 24% Based on 3,044 properties

Coverage

Wealden (98%)|Rother (2%)

Areas Covered

Herstmonceux & Pevensey Levels, Pevensey Bay, Stone Cross, Polegate Central, Bexhill St Marks

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

BN23 (Eastbourne)
≈1.8 km away
Local sunshine: ~1,126 kWh/kWp · -1% vs BN24
BN22 (Eastbourne)
≈4.3 km away
Local sunshine: ~1,138 kWh/kWp · +0% vs BN24
BN26 (Wealden)
≈5.6 km away
Local sunshine: ~1,155 kWh/kWp · +2% vs BN24
BN21 (Eastbourne)
≈5.8 km away
Local sunshine: ~1,135 kWh/kWp · -0% vs BN24
BN20 (Eastbourne)
≈6.8 km away
Local sunshine: ~1,141 kWh/kWp · +0% vs BN24
BN27 (Wealden)
≈7.3 km away
Local sunshine: ~1,134 kWh/kWp · -0% vs BN24

Similar sunshine across the UK

PO19 (Chichester)
~1,138 kWh/kWp · +0% vs BN24
PO30 (Isle of Wight)
~1,133 kWh/kWp · -0% vs BN24
PO10 (Havant)
~1,133 kWh/kWp · -0% vs BN24