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Solar panel cost in Wealden (TN20)

See realistic solar installation costs, savings and payback for TN20 (Wealden) in under a minute using official UK data. Start with the calculator, then get a no-obligation quote from an MCS-certified installer. You can also ask the SolarByPostcode assistant to sanity-check your roof, bills and plans.

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
9.4 years
After this, it's pure profit
Upfront Cost
£9,767
What you pay to get started
Annual Benefit
£1,041
What you save every year
Profit Over 25 Years
£16,255
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: The official cost per kW is lower above 4 kW, so a 5–6 kW system can pay back a little faster than a 3–4 kW system on otherwise identical assumptions.
  • 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

Panel costs: Uses March 2026 TIC mean installation costs: £1,827/kW up to 4 kW and £1,628/kW above 4 kW.

Other costs: Battery prices are modelled at £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 26.67p/kWh with a 54.45p/day standing charge. Your postcode’s south-facing sunshine yield is 1041 kWh/kW — 12 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 1041 kWh per year on a south-facing roof. We value self-used electricity at 26.7p and exported surplus at a baseline 10p via SEG. Use the calculator above for your exact tariff.

Unit rate
26.7p/kWh
Standing charge
54.5p/day
Sunshine yield (south)
1041 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: £867, Upfront: £8,139, Break-even: 9.4 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2082 kWh 833 kWh 1249 kWh £222 £125 £347 £3,256 9.4 yrs £3,684
3 kW 3122 kWh 1249 kWh 1873 kWh £333 £187 £520 £4,883 9.4 yrs £5,525
4 kW 4163 kWh 1665 kWh 2498 kWh £444 £250 £694 £6,511 9.4 yrs £7,367
5 kW 5204 kWh 2082 kWh 3122 kWh £555 £312 £867 £8,139 9.4 yrs £9,209
6 kW 6245 kWh 2498 kWh 3747 kWh £666 £375 £1,041 £9,767 9.4 yrs £11,051
7 kW 7286 kWh 2914 kWh 4371 kWh £777 £437 £1,214 £11,394 9.4 yrs £12,893
8 kW 8326 kWh 3331 kWh 4996 kWh £888 £500 £1,388 £13,022 9.4 yrs £14,735

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,628, battery £/kWh = 700.

3 kWh battery 5 kW example → Annual benefit: £1,041, Upfront: £10,239, Break-even: 9.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2082 kWh 1249 kWh 833 kWh £333 £83 £416 £5,356 12.9 yrs £2,972
3 kW 3122 kWh 1873 kWh 1249 kWh £500 £125 £625 £6,983 11.2 yrs £5,507
4 kW 4163 kWh 2498 kWh 1665 kWh £666 £167 £833 £8,611 10.3 yrs £8,043
5 kW 5204 kWh 3122 kWh 2082 kWh £833 £208 £1,041 £10,239 9.8 yrs £10,579
6 kW 6245 kWh 3747 kWh 2498 kWh £999 £250 £1,249 £11,867 9.5 yrs £13,115
7 kW 7286 kWh 4371 kWh 2914 kWh £1,166 £291 £1,457 £13,494 9.3 yrs £15,651
8 kW 8326 kWh 4996 kWh 3331 kWh £1,332 £333 £1,665 £15,122 9.1 yrs £18,187

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,628, battery £/kWh = 700.

5 kWh battery 5 kW example → Annual benefit: £1,128, Upfront: £11,639, Break-even: 10.3 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2082 kWh 1457 kWh 624 kWh £389 £62 £451 £6,756 15.0 yrs £2,266
3 kW 3122 kWh 2186 kWh 937 kWh £583 £94 £677 £8,383 12.4 yrs £5,148
4 kW 4163 kWh 2914 kWh 1249 kWh £777 £125 £902 £10,011 11.1 yrs £8,031
5 kW 5204 kWh 3643 kWh 1561 kWh £972 £156 £1,128 £11,639 10.3 yrs £10,914
6 kW 6245 kWh 4371 kWh 1873 kWh £1,166 £187 £1,353 £13,267 9.8 yrs £13,797
7 kW 7286 kWh 5100 kWh 2186 kWh £1,360 £219 £1,579 £14,894 9.4 yrs £16,680
8 kW 8326 kWh 5828 kWh 2498 kWh £1,554 £250 £1,804 £16,522 9.2 yrs £19,563

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,628, battery £/kWh = 700.

7.5 kWh battery 5 kW example → Annual benefit: £1,154, Upfront: £13,389, 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 2082 kWh 1520 kWh 562 kWh £405 £56 £461 £8,506 18.4 yrs £724
3 kW 3122 kWh 2279 kWh 843 kWh £608 £84 £692 £10,133 14.6 yrs £3,711
4 kW 4163 kWh 3039 kWh 1124 kWh £811 £112 £923 £11,761 12.7 yrs £6,698
5 kW 5204 kWh 3799 kWh 1405 kWh £1,013 £141 £1,154 £13,389 11.6 yrs £9,685
6 kW 6245 kWh 4559 kWh 1686 kWh £1,216 £169 £1,384 £15,017 10.8 yrs £12,671
7 kW 7286 kWh 5318 kWh 1967 kWh £1,418 £197 £1,615 £16,644 10.3 yrs £15,658
8 kW 8326 kWh 6078 kWh 2248 kWh £1,621 £225 £1,846 £18,272 9.9 yrs £18,645

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,628, battery £/kWh = 700.

10 kWh battery 5 kW example → Annual benefit: £1,171, Upfront: £15,139, Break-even: 12.9 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2082 kWh 1561 kWh 520 kWh £416 £52 £468 £10,256 21.9 yrs £-887
3 kW 3122 kWh 2342 kWh 781 kWh £625 £78 £703 £11,883 16.9 yrs £2,169
4 kW 4163 kWh 3122 kWh 1041 kWh £833 £104 £937 £13,511 14.4 yrs £5,225
5 kW 5204 kWh 3903 kWh 1301 kWh £1,041 £130 £1,171 £15,139 12.9 yrs £8,282
6 kW 6245 kWh 4684 kWh 1561 kWh £1,249 £156 £1,405 £16,767 11.9 yrs £11,338
7 kW 7286 kWh 5464 kWh 1821 kWh £1,457 £182 £1,639 £18,394 11.2 yrs £14,394
8 kW 8326 kWh 6245 kWh 2082 kWh £1,665 £208 £1,874 £20,022 10.7 yrs £17,451

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,628, battery £/kWh = 700.

13.5 kWh battery 5 kW example → Annual benefit: £1,188, Upfront: £17,589, Break-even: 14.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2082 kWh 1603 kWh 479 kWh £427 £48 £475 £12,706 26.7 yrs £-3,199
3 kW 3122 kWh 2404 kWh 718 kWh £641 £72 £713 £14,333 20.1 yrs £-73
4 kW 4163 kWh 3206 kWh 958 kWh £855 £96 £951 £15,961 16.8 yrs £3,053
5 kW 5204 kWh 4007 kWh 1197 kWh £1,069 £120 £1,188 £17,589 14.8 yrs £6,179
6 kW 6245 kWh 4808 kWh 1436 kWh £1,282 £144 £1,426 £19,217 13.5 yrs £9,304
7 kW 7286 kWh 5610 kWh 1676 kWh £1,496 £168 £1,664 £20,844 12.5 yrs £12,430
8 kW 8326 kWh 6411 kWh 1915 kWh £1,710 £192 £1,901 £22,472 11.8 yrs £15,556

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,628, 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.

Before you request quotes in Wealden

Use the numbers above to sanity-check installer quotes. The main things to compare are system size, battery assumptions, payback claims, MCS certification, DNO paperwork and export assumptions.

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Understand DNO, G98 and G99 export limits

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Insights for TN20

Figures below are tailored to TN20 — click through for full league tables.

Big-Roof Britain Rank #45 of 2182
7.1 kWp (UK avg 5.1 kWp)
~15 panels (≈430 W)
Solar Payback Index Rank #256 of 2996
9.4 years (UK avg 10.8 years)
~£1,041 /yr • £9,767 upfront
Standing-Charge Drag Rank #345 of 2996
19.1% (UK avg 26.6%) drag on savings
£199 fixed • ~£1,041 /yr value
Aspect Penalty View ranking →
East −20.0% West −20.7%
Typical output loss versus a south-facing roof (lower is better)

Seasonal solar output in TN20

Monthly generation per kilowatt of solar panels

kWh 40 Jan 52 Feb 88 Mar 117 Apr 123 May 128 Jun 129 Jul 115 Aug 97 Sep 68 Oct 47 Nov 36 Dec
Best month Worst month Winter (Dec–Feb) Other months

Winter output: 49.3% of an average month (Dec–Feb)

Best / worst month: Jul / Dec

These figures show output per kilowatt (kW) of panels installed. In winter, a 1 kW system here produces about 43 kWh per month; the average month produces around 87 kWh. So a typical 4 kW home system would generate roughly 171 kWh in winter, or 347 kWh in an average month.

Your Area at a Glance

Your Electricity Rate
26.67p/kWh
Daily Fixed Charge
54.45p/day
Local Sunshine
1041kWh/kW
A 1 kW system generates ~1041 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: 70% • Flats: 16% • Bungalows: 12% Based on 927 properties

Coverage

Wealden (90%)|Tunbridge Wells (10%)

Areas Covered

Mayfield & Five Ashes, Sherwood, Frant & Wadhurst, Hadlow Down & Rotherfield, Uckfield New Town

Data Sources & Assumptions

Solar yield: PVGIS (EU Joint Research Centre), January 2025 data

Electricity rates: Ofgem price cap, Q3 2026

Installation costs: DESNZ/MCS data, March 2026 (TIC)

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

TN21 (Wealden)
≈6.0 km away
Local sunshine: ~1,049 kWh/kWp · +1% vs TN20
TN5 (Wealden)
≈7.4 km away
Local sunshine: ~1,045 kWh/kWp · +0% vs TN20
TN6 (Wealden)
≈7.8 km away
Local sunshine: ~1,026 kWh/kWp · -1% vs TN20
TN19 (Rother)
≈12.3 km away
Local sunshine: ~1,052 kWh/kWp · +1% vs TN20
TN3 (Tunbridge Wells)
≈12.4 km away
Local sunshine: ~1,023 kWh/kWp · -2% vs TN20
TN22 (Wealden)
≈12.6 km away
Local sunshine: ~1,055 kWh/kWp · +1% vs TN20

Similar sunshine across the UK

IP2 (Ipswich)
~1,041 kWh/kWp · +0% vs TN20
TR2 (Cornwall)
~1,041 kWh/kWp · -0% vs TN20
PL12 (Cornwall)
~1,041 kWh/kWp · -0% vs TN20