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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in BN27 (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
£10,173
What you pay to get started
Annual Benefit
£951
What you save every year
Profit Over 25 Years
£13,592
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 1134 kWh/kW — 105 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 1134 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)
1134 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: £951, 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 2268 kWh 907 kWh 1361 kWh £244 £136 £380 £4,069 10.7 yrs £3,536
3 kW 3401 kWh 1361 kWh 2041 kWh £366 £204 £570 £6,104 10.7 yrs £5,303
4 kW 4535 kWh 1814 kWh 2721 kWh £488 £272 £760 £8,138 10.7 yrs £7,071
5 kW 5669 kWh 2268 kWh 3401 kWh £610 £340 £951 £10,173 10.7 yrs £8,839
6 kW 6803 kWh 2721 kWh 4082 kWh £733 £408 £1,141 £12,207 10.7 yrs £10,607
7 kW 7937 kWh 3175 kWh 4762 kWh £855 £476 £1,331 £14,242 10.7 yrs £12,375
8 kW 9070 kWh 3628 kWh 5442 kWh £977 £544 £1,521 £16,276 10.7 yrs £14,142

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: £1,142, 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 2268 kWh 1361 kWh 907 kWh £366 £91 £457 £6,169 13.5 yrs £2,970
3 kW 3401 kWh 2041 kWh 1361 kWh £549 £136 £685 £8,204 12.0 yrs £5,505
4 kW 4535 kWh 2721 kWh 1814 kWh £733 £181 £914 £10,238 11.2 yrs £8,041
5 kW 5669 kWh 3401 kWh 2268 kWh £916 £227 £1,142 £12,273 10.7 yrs £10,576
6 kW 6803 kWh 4082 kWh 2721 kWh £1,099 £272 £1,371 £14,307 10.4 yrs £13,111
7 kW 7937 kWh 4762 kWh 3175 kWh £1,282 £317 £1,599 £16,342 10.2 yrs £15,646
8 kW 9070 kWh 5442 kWh 3628 kWh £1,465 £363 £1,828 £18,376 10.1 yrs £18,181

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: £1,238, 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 2268 kWh 1587 kWh 680 kWh £427 £68 £495 £7,569 15.3 yrs £2,338
3 kW 3401 kWh 2381 kWh 1020 kWh £641 £102 £743 £9,604 12.9 yrs £5,257
4 kW 4535 kWh 3175 kWh 1361 kWh £855 £136 £991 £11,638 11.7 yrs £8,175
5 kW 5669 kWh 3968 kWh 1701 kWh £1,068 £170 £1,238 £13,673 11.0 yrs £11,094
6 kW 6803 kWh 4762 kWh 2041 kWh £1,282 £204 £1,486 £15,707 10.6 yrs £14,013
7 kW 7937 kWh 5556 kWh 2381 kWh £1,496 £238 £1,734 £17,742 10.2 yrs £16,932
8 kW 9070 kWh 6349 kWh 2721 kWh £1,709 £272 £1,981 £19,776 10.0 yrs £19,851

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: £1,267, Upfront: £15,423, Break-even: 12.2 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2268 kWh 1655 kWh 612 kWh £446 £61 £507 £9,319 18.4 yrs £818
3 kW 3401 kWh 2483 kWh 918 kWh £668 £92 £760 £11,354 14.9 yrs £3,852
4 kW 4535 kWh 3311 kWh 1225 kWh £891 £122 £1,014 £13,388 13.2 yrs £6,886
5 kW 5669 kWh 4138 kWh 1531 kWh £1,114 £153 £1,267 £15,423 12.2 yrs £9,920
6 kW 6803 kWh 4966 kWh 1837 kWh £1,337 £184 £1,521 £17,457 11.5 yrs £12,954
7 kW 7937 kWh 5794 kWh 2143 kWh £1,560 £214 £1,774 £19,492 11.0 yrs £15,988
8 kW 9070 kWh 6621 kWh 2449 kWh £1,782 £245 £2,027 £21,526 10.6 yrs £19,022

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: £1,286, Upfront: £17,173, Break-even: 13.4 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2268 kWh 1701 kWh 567 kWh £458 £57 £515 £11,069 21.5 yrs £-779
3 kW 3401 kWh 2551 kWh 850 kWh £687 £85 £772 £13,104 17.0 yrs £2,332
4 kW 4535 kWh 3401 kWh 1134 kWh £916 £113 £1,029 £15,138 14.7 yrs £5,443
5 kW 5669 kWh 4252 kWh 1417 kWh £1,145 £142 £1,286 £17,173 13.4 yrs £8,553
6 kW 6803 kWh 5102 kWh 1701 kWh £1,373 £170 £1,544 £19,207 12.4 yrs £11,664
7 kW 7937 kWh 5952 kWh 1984 kWh £1,602 £198 £1,801 £21,242 11.8 yrs £14,775
8 kW 9070 kWh 6803 kWh 2268 kWh £1,831 £227 £2,058 £23,276 11.3 yrs £17,885

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: £1,305, 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 2268 kWh 1746 kWh 522 kWh £470 £52 £522 £13,519 25.9 yrs £-3,075
3 kW 3401 kWh 2619 kWh 782 kWh £705 £78 £783 £15,554 19.9 yrs £112
4 kW 4535 kWh 3492 kWh 1043 kWh £940 £104 £1,044 £17,588 16.8 yrs £3,300
5 kW 5669 kWh 4365 kWh 1304 kWh £1,175 £130 £1,305 £19,623 15.0 yrs £6,487
6 kW 6803 kWh 5238 kWh 1565 kWh £1,410 £156 £1,567 £21,657 13.8 yrs £9,674
7 kW 7937 kWh 6111 kWh 1825 kWh £1,645 £183 £1,828 £23,692 13.0 yrs £12,862
8 kW 9070 kWh 6984 kWh 2086 kWh £1,880 £209 £2,089 £25,726 12.3 yrs £16,049

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 BN27

Figures below are tailored to BN27 — click through for full league tables.

Big-Roof Britain Rank #816 of 2182
5.2 kWp (UK avg 5.1 kWp)
~11 panels (≈430 W)
Solar Payback Index Rank #8 of 2997
9.3 years (UK avg 11.3 years)
~£1,094 /yr • £10,173 upfront
Standing-Charge Drag Rank #552 of 2997
15.9% (UK avg 21.7%) drag on savings
£174 fixed • ~£1,094 /yr value

Your Area at a Glance

Your Electricity Rate
26.92p/kWh
Daily Fixed Charge
47.60p/day
Local Sunshine
1134kWh/kW
A 1 kW system generates ~1134 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: 67% • Flats: 14% • Bungalows: 15% Based on 9,827 properties

Coverage

Wealden (100%)

Areas Covered

Hailsham Central, Hailsham East, Hellingly, Herstmonceux & Pevensey Levels, Hailsham South, Hailsham North, Hailsham West, Arlington + 5 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

BN26 (Wealden)
≈4.9 km away
Local sunshine: ~1,155 kWh/kWp · +2% vs BN27
BN24 (Wealden)
≈7.3 km away
Local sunshine: ~1,137 kWh/kWp · +0% vs BN27
BN23 (Eastbourne)
≈8.4 km away
Local sunshine: ~1,126 kWh/kWp · -1% vs BN27
BN22 (Eastbourne)
≈9.2 km away
Local sunshine: ~1,138 kWh/kWp · +0% vs BN27
BN20 (Eastbourne)
≈10.6 km away
Local sunshine: ~1,141 kWh/kWp · +1% vs BN27
BN21 (Eastbourne)
≈10.7 km away
Local sunshine: ~1,135 kWh/kWp · +0% vs BN27

Similar sunshine across the UK

PO30 (Isle of Wight)
~1,133 kWh/kWp · -0% vs BN27
PO10 (Havant)
~1,133 kWh/kWp · -0% vs BN27
PO19 (Chichester)
~1,138 kWh/kWp · +0% vs BN27