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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in TN21 (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
11.6 years
After this, it's pure profit
Upfront Cost
£12,207
What you pay to get started
Annual Benefit
£1,055
What you save every year
Profit Over 25 Years
£14,172
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 1049 kWh/kW — 20 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 1049 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)
1049 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: £879, Upfront: £10,173, Break-even: 11.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2098 kWh 839 kWh 1259 kWh £226 £126 £352 £4,069 11.6 yrs £2,965
3 kW 3146 kWh 1259 kWh 1888 kWh £339 £189 £528 £6,104 11.6 yrs £4,448
4 kW 4195 kWh 1678 kWh 2517 kWh £452 £252 £703 £8,138 11.6 yrs £5,931
5 kW 5244 kWh 2098 kWh 3146 kWh £565 £315 £879 £10,173 11.6 yrs £7,414
6 kW 6293 kWh 2517 kWh 3776 kWh £678 £378 £1,055 £12,207 11.6 yrs £8,896
7 kW 7342 kWh 2937 kWh 4405 kWh £791 £440 £1,231 £14,242 11.6 yrs £10,379
8 kW 8390 kWh 3356 kWh 5034 kWh £903 £503 £1,407 £16,276 11.6 yrs £11,862

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: £1,057, Upfront: £12,273, Break-even: 11.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2098 kWh 1259 kWh 839 kWh £339 £84 £423 £6,169 14.6 yrs £2,285
3 kW 3146 kWh 1888 kWh 1259 kWh £508 £126 £634 £8,204 12.9 yrs £4,478
4 kW 4195 kWh 2517 kWh 1678 kWh £678 £168 £845 £10,238 12.1 yrs £6,670
5 kW 5244 kWh 3146 kWh 2098 kWh £847 £210 £1,057 £12,273 11.6 yrs £8,863
6 kW 6293 kWh 3776 kWh 2517 kWh £1,016 £252 £1,268 £14,307 11.3 yrs £11,055
7 kW 7342 kWh 4405 kWh 2937 kWh £1,186 £294 £1,479 £16,342 11.0 yrs £13,248
8 kW 8390 kWh 5034 kWh 3356 kWh £1,355 £336 £1,691 £18,376 10.9 yrs £15,440

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: £1,145, Upfront: £13,673, Break-even: 11.9 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2098 kWh 1468 kWh 629 kWh £395 £63 £458 £7,569 16.5 yrs £1,595
3 kW 3146 kWh 2202 kWh 944 kWh £593 £94 £687 £9,604 14.0 yrs £4,142
4 kW 4195 kWh 2937 kWh 1259 kWh £791 £126 £916 £11,638 12.7 yrs £6,690
5 kW 5244 kWh 3671 kWh 1573 kWh £988 £157 £1,145 £13,673 11.9 yrs £9,237
6 kW 6293 kWh 4405 kWh 1888 kWh £1,186 £189 £1,375 £15,707 11.4 yrs £11,785
7 kW 7342 kWh 5139 kWh 2202 kWh £1,383 £220 £1,604 £17,742 11.1 yrs £14,332
8 kW 8390 kWh 5873 kWh 2517 kWh £1,581 £252 £1,833 £19,776 10.8 yrs £16,880

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: £1,172, Upfront: £15,423, Break-even: 13.2 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2098 kWh 1531 kWh 566 kWh £412 £57 £469 £9,319 19.9 yrs £58
3 kW 3146 kWh 2297 kWh 850 kWh £618 £85 £703 £11,354 16.1 yrs £2,712
4 kW 4195 kWh 3062 kWh 1133 kWh £824 £113 £938 £13,388 14.3 yrs £5,366
5 kW 5244 kWh 3828 kWh 1416 kWh £1,031 £142 £1,172 £15,423 13.2 yrs £8,020
6 kW 6293 kWh 4594 kWh 1699 kWh £1,237 £170 £1,407 £17,457 12.4 yrs £10,674
7 kW 7342 kWh 5359 kWh 1982 kWh £1,443 £198 £1,641 £19,492 11.9 yrs £13,327
8 kW 8390 kWh 6125 kWh 2265 kWh £1,649 £227 £1,875 £21,526 11.5 yrs £15,981

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: £1,190, Upfront: £17,173, Break-even: 14.4 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2098 kWh 1573 kWh 524 kWh £424 £52 £476 £11,069 23.3 yrs £-1,550
3 kW 3146 kWh 2360 kWh 787 kWh £635 £79 £714 £13,104 18.4 yrs £1,175
4 kW 4195 kWh 3146 kWh 1049 kWh £847 £105 £952 £15,138 15.9 yrs £3,900
5 kW 5244 kWh 3933 kWh 1311 kWh £1,059 £131 £1,190 £17,173 14.4 yrs £6,624
6 kW 6293 kWh 4720 kWh 1573 kWh £1,271 £157 £1,428 £19,207 13.5 yrs £9,349
7 kW 7342 kWh 5506 kWh 1835 kWh £1,482 £184 £1,666 £21,242 12.8 yrs £12,074
8 kW 8390 kWh 6293 kWh 2098 kWh £1,694 £210 £1,904 £23,276 12.2 yrs £14,799

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: £1,208, Upfront: £19,623, Break-even: 16.2 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2098 kWh 1615 kWh 482 kWh £435 £48 £483 £13,519 28.0 yrs £-3,858
3 kW 3146 kWh 2423 kWh 724 kWh £652 £72 £725 £15,554 21.5 yrs £-1,062
4 kW 4195 kWh 3230 kWh 965 kWh £870 £96 £966 £17,588 18.2 yrs £1,734
5 kW 5244 kWh 4038 kWh 1206 kWh £1,087 £121 £1,208 £19,623 16.2 yrs £4,529
6 kW 6293 kWh 4845 kWh 1447 kWh £1,304 £145 £1,449 £21,657 14.9 yrs £7,325
7 kW 7342 kWh 5653 kWh 1689 kWh £1,522 £169 £1,691 £23,692 14.0 yrs £10,121
8 kW 8390 kWh 6461 kWh 1930 kWh £1,739 £193 £1,932 £25,726 13.3 yrs £12,917

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 TN21

Figures below are tailored to TN21 — click through for full league tables.

Big-Roof Britain Rank #280 of 2182
5.9 kWp (UK avg 5.1 kWp)
~12 panels (≈430 W)
Solar Payback Index Rank #201 of 2997
10.0 years (UK avg 11.3 years)
~£1,215 /yr • £12,207 upfront
Standing-Charge Drag Rank #130 of 2997
14.3% (UK avg 21.7%) drag on savings
£174 fixed • ~£1,215 /yr value

Your Area at a Glance

Your Electricity Rate
26.92p/kWh
Daily Fixed Charge
47.60p/day
Local Sunshine
1049kWh/kW
A 1 kW system generates ~1049 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: 64% • Flats: 19% • Bungalows: 16% Based on 4,547 properties

Coverage

Wealden (96%)|Rother (4%)

Areas Covered

Heathfield North, Horam & Punnetts Town, Heathfield South, Framfield & Cross-in-Hand, Chiddingly, East Hoathly & Waldron, Catsfield & Crowhurst, Mayfield & Five Ashes + 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

TN20 (Wealden)
≈6.0 km away
Local sunshine: ~1,041 kWh/kWp · -1% vs TN21
TN22 (Wealden)
≈11.0 km away
Local sunshine: ~1,055 kWh/kWp · +1% vs TN21
BN27 (Wealden)
≈11.3 km away
Local sunshine: ~1,134 kWh/kWp · +8% vs TN21
TN6 (Wealden)
≈11.7 km away
Local sunshine: ~1,026 kWh/kWp · -2% vs TN21
TN5 (Wealden)
≈12.3 km away
Local sunshine: ~1,045 kWh/kWp · -0% vs TN21
TN19 (Rother)
≈13.6 km away
Local sunshine: ~1,052 kWh/kWp · +0% vs TN21

Similar sunshine across the UK

PL24 (Cornwall)
~1,049 kWh/kWp · +0% vs TN21
NR13 (Broadland)
~1,048 kWh/kWp · -0% vs TN21
IP7 (Babergh)
~1,050 kWh/kWp · +0% vs TN21