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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in TN40 (Rother)

See if solar pays off for you in Rother — 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
£6,104
What you pay to get started
Annual Benefit
£561
What you save every year
Profit Over 25 Years
£7,921
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 1115 kWh/kW — 86 above the regional median (1029).

Read the full story

A typical roof here lands around 3.0 kW, with most eligible homes comfortably fitting within 3–6 kW. Each kilowatt of panels produces roughly 1115 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)
1115 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: £935, 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 2230 kWh 892 kWh 1338 kWh £240 £134 £374 £4,069 10.9 yrs £3,411
3 kW 3346 kWh 1338 kWh 2007 kWh £360 £201 £561 £6,104 10.9 yrs £5,116
4 kW 4461 kWh 1784 kWh 2676 kWh £480 £268 £748 £8,138 10.9 yrs £6,821
5 kW 5576 kWh 2230 kWh 3346 kWh £600 £335 £935 £10,173 10.9 yrs £8,527
6 kW 6691 kWh 2676 kWh 4015 kWh £720 £401 £1,122 £12,207 10.9 yrs £10,232
7 kW 7806 kWh 3123 kWh 4684 kWh £841 £468 £1,309 £14,242 10.9 yrs £11,938
8 kW 8921 kWh 3569 kWh 5353 kWh £961 £535 £1,496 £16,276 10.9 yrs £13,643

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: £1,124, Upfront: £12,273, 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 2230 kWh 1338 kWh 892 kWh £360 £89 £449 £6,169 13.7 yrs £2,820
3 kW 3346 kWh 2007 kWh 1338 kWh £540 £134 £674 £8,204 12.2 yrs £5,280
4 kW 4461 kWh 2676 kWh 1784 kWh £720 £178 £899 £10,238 11.4 yrs £7,740
5 kW 5576 kWh 3346 kWh 2230 kWh £901 £223 £1,124 £12,273 10.9 yrs £10,201
6 kW 6691 kWh 4015 kWh 2676 kWh £1,081 £268 £1,348 £14,307 10.6 yrs £12,661
7 kW 7806 kWh 4684 kWh 3123 kWh £1,261 £312 £1,573 £16,342 10.4 yrs £15,121
8 kW 8921 kWh 5353 kWh 3569 kWh £1,441 £357 £1,798 £18,376 10.2 yrs £17,581

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: £1,218, Upfront: £13,673, Break-even: 11.2 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2230 kWh 1561 kWh 669 kWh £420 £67 £487 £7,569 15.5 yrs £2,175
3 kW 3346 kWh 2342 kWh 1004 kWh £630 £100 £731 £9,604 13.1 yrs £5,012
4 kW 4461 kWh 3123 kWh 1338 kWh £841 £134 £974 £11,638 11.9 yrs £7,850
5 kW 5576 kWh 3903 kWh 1673 kWh £1,051 £167 £1,218 £13,673 11.2 yrs £10,687
6 kW 6691 kWh 4684 kWh 2007 kWh £1,261 £201 £1,462 £15,707 10.7 yrs £13,525
7 kW 7806 kWh 5464 kWh 2342 kWh £1,471 £234 £1,705 £17,742 10.4 yrs £16,362
8 kW 8921 kWh 6245 kWh 2676 kWh £1,681 £268 £1,949 £19,776 10.1 yrs £19,200

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: £1,246, 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 2230 kWh 1628 kWh 602 kWh £438 £60 £499 £9,319 18.7 yrs £651
3 kW 3346 kWh 2442 kWh 903 kWh £657 £90 £748 £11,354 15.2 yrs £3,602
4 kW 4461 kWh 3256 kWh 1204 kWh £877 £120 £997 £13,388 13.4 yrs £6,553
5 kW 5576 kWh 4070 kWh 1505 kWh £1,096 £151 £1,246 £15,423 12.4 yrs £9,504
6 kW 6691 kWh 4884 kWh 1807 kWh £1,315 £181 £1,496 £17,457 11.7 yrs £12,454
7 kW 7806 kWh 5699 kWh 2108 kWh £1,534 £211 £1,745 £19,492 11.2 yrs £15,405
8 kW 8921 kWh 6513 kWh 2409 kWh £1,753 £241 £1,994 £21,526 10.8 yrs £18,356

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: £1,265, 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 2230 kWh 1673 kWh 558 kWh £450 £56 £506 £11,069 21.9 yrs £-948
3 kW 3346 kWh 2509 kWh 836 kWh £675 £84 £759 £13,104 17.3 yrs £2,079
4 kW 4461 kWh 3346 kWh 1115 kWh £901 £112 £1,012 £15,138 15.0 yrs £5,105
5 kW 5576 kWh 4182 kWh 1394 kWh £1,126 £139 £1,265 £17,173 13.6 yrs £8,131
6 kW 6691 kWh 5018 kWh 1673 kWh £1,351 £167 £1,518 £19,207 12.7 yrs £11,157
7 kW 7806 kWh 5855 kWh 1952 kWh £1,576 £195 £1,771 £21,242 12.0 yrs £14,183
8 kW 8921 kWh 6691 kWh 2230 kWh £1,801 £223 £2,024 £23,276 11.5 yrs £17,209

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: £1,284, 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 2230 kWh 1717 kWh 513 kWh £462 £51 £514 £13,519 26.3 yrs £-3,247
3 kW 3346 kWh 2576 kWh 769 kWh £693 £77 £770 £15,554 20.2 yrs £-145
4 kW 4461 kWh 3435 kWh 1026 kWh £925 £103 £1,027 £17,588 17.1 yrs £2,957
5 kW 5576 kWh 4293 kWh 1282 kWh £1,156 £128 £1,284 £19,623 15.3 yrs £6,058
6 kW 6691 kWh 5152 kWh 1539 kWh £1,387 £154 £1,541 £21,657 14.1 yrs £9,160
7 kW 7806 kWh 6011 kWh 1795 kWh £1,618 £180 £1,798 £23,692 13.2 yrs £12,262
8 kW 8921 kWh 6870 kWh 2052 kWh £1,849 £205 £2,054 £25,726 12.5 yrs £15,363

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 TN40

Figures below are tailored to TN40 — click through for full league tables.

Big-Roof Britain Rank #1207 of 2182
4.9 kWp (UK avg 5.1 kWp)
~10 panels (≈430 W)
Solar Payback Index Rank #34 of 2997
9.4 years (UK avg 11.3 years)
~£1,292 /yr • £12,207 upfront
Standing-Charge Drag Rank #52 of 2997
13.4% (UK avg 21.7%) drag on savings
£174 fixed • ~£1,292 /yr value

Your Area at a Glance

Your Electricity Rate
26.92p/kWh
Daily Fixed Charge
47.60p/day
Local Sunshine
1115kWh/kW
A 1 kW system generates ~1115 kWh per year. A typical home uses ~2,700 kWh per year.
Typical System Size
3.0kW
For houses & bungalows in this area

⚠️ This area is predominantly flats. Many residents require freeholder approval for solar installations. System size shown reflects houses and bungalows only.

Local Property Data

Property Types

Houses: 34% • Flats: 51% • Bungalows: 12% Based on 6,446 properties

Coverage

Rother (100%)

Areas Covered

Bexhill Central, Bexhill Sackville, Bexhill Old Town & Worsham, Bexhill Pebsham & St Michaels, Bexhill St Stephens

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

TN39 (Rother)
≈1.4 km away
Local sunshine: ~1,116 kWh/kWp · +0% vs TN40
TN38 (Hastings)
≈5.8 km away
Local sunshine: ~1,124 kWh/kWp · +1% vs TN40
TN37 (Hastings)
≈6.4 km away
Local sunshine: ~1,125 kWh/kWp · +1% vs TN40
TN34 (Hastings)
≈7.3 km away
Local sunshine: ~1,125 kWh/kWp · +1% vs TN40
TN33 (Rother)
≈8.3 km away
Local sunshine: ~1,093 kWh/kWp · -2% vs TN40
TN35 (Hastings)
≈9.8 km away
Local sunshine: ~1,124 kWh/kWp · +1% vs TN40

Similar sunshine across the UK

TQ8 (South Hams)
~1,115 kWh/kWp · -0% vs TN40
PO40 (Isle of Wight)
~1,113 kWh/kWp · -0% vs TN40
PO39 (Isle of Wight)
~1,113 kWh/kWp · -0% vs TN40