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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in EX24 (East Devon)

See if solar pays off for you in East Devon — 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
11.4 years
After this, it's pure profit
Upfront Cost
£12,207
What you pay to get started
Annual Benefit
£1,068
What you save every year
Profit Over 25 Years
£14,495
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 Southern Western, the current unit rate is 26.82p/kWh with a 54.03p/day standing charge. Your postcode’s south-facing sunshine yield is 1064 kWh/kW — 51 above the regional median (1013).

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 1064 kWh per year on a south-facing roof. We value self-used electricity at 26.8p and exported surplus at a baseline 10p via SEG. Use the calculator above for your exact tariff.

Unit rate
26.8p/kWh
Standing charge
54.0p/day
Sunshine yield (south)
1064 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: £890, Upfront: £10,173, Break-even: 11.4 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2128 kWh 851 kWh 1277 kWh £228 £128 £356 £4,069 11.4 yrs £3,052
3 kW 3193 kWh 1277 kWh 1916 kWh £342 £192 £534 £6,104 11.4 yrs £4,577
4 kW 4257 kWh 1703 kWh 2554 kWh £457 £255 £712 £8,138 11.4 yrs £6,103
5 kW 5321 kWh 2128 kWh 3193 kWh £571 £319 £890 £10,173 11.4 yrs £7,629
6 kW 6385 kWh 2554 kWh 3831 kWh £685 £383 £1,068 £12,207 11.4 yrs £9,155
7 kW 7449 kWh 2980 kWh 4470 kWh £799 £447 £1,246 £14,242 11.4 yrs £10,680
8 kW 8513 kWh 3405 kWh 5108 kWh £913 £511 £1,424 £16,276 11.4 yrs £12,206

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: £1,069, Upfront: £12,273, Break-even: 11.5 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2128 kWh 1277 kWh 851 kWh £342 £85 £428 £6,169 14.4 yrs £2,384
3 kW 3193 kWh 1916 kWh 1277 kWh £514 £128 £641 £8,204 12.8 yrs £4,625
4 kW 4257 kWh 2554 kWh 1703 kWh £685 £170 £855 £10,238 12.0 yrs £6,867
5 kW 5321 kWh 3193 kWh 2128 kWh £856 £213 £1,069 £12,273 11.5 yrs £9,109
6 kW 6385 kWh 3831 kWh 2554 kWh £1,027 £255 £1,283 £14,307 11.2 yrs £11,351
7 kW 7449 kWh 4470 kWh 2980 kWh £1,199 £298 £1,497 £16,342 10.9 yrs £13,592
8 kW 8513 kWh 5108 kWh 3405 kWh £1,370 £341 £1,711 £18,376 10.7 yrs £15,834

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: £1,159, Upfront: £13,673, Break-even: 11.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2128 kWh 1490 kWh 639 kWh £400 £64 £463 £7,569 16.3 yrs £1,699
3 kW 3193 kWh 2235 kWh 958 kWh £599 £96 £695 £9,604 13.8 yrs £4,299
4 kW 4257 kWh 2980 kWh 1277 kWh £799 £128 £927 £11,638 12.6 yrs £6,899
5 kW 5321 kWh 3725 kWh 1596 kWh £999 £160 £1,159 £13,673 11.8 yrs £9,499
6 kW 6385 kWh 4470 kWh 1916 kWh £1,199 £192 £1,390 £15,707 11.3 yrs £12,098
7 kW 7449 kWh 5214 kWh 2235 kWh £1,399 £223 £1,622 £17,742 10.9 yrs £14,698
8 kW 8513 kWh 5959 kWh 2554 kWh £1,598 £255 £1,854 £19,776 10.7 yrs £17,298

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: £1,185, Upfront: £15,423, Break-even: 13.0 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2128 kWh 1554 kWh 575 kWh £417 £57 £474 £9,319 19.7 yrs £164
3 kW 3193 kWh 2331 kWh 862 kWh £625 £86 £711 £11,354 16.0 yrs £2,871
4 kW 4257 kWh 3107 kWh 1149 kWh £833 £115 £948 £13,388 14.1 yrs £5,579
5 kW 5321 kWh 3884 kWh 1437 kWh £1,042 £144 £1,185 £15,423 13.0 yrs £8,286
6 kW 6385 kWh 4661 kWh 1724 kWh £1,250 £172 £1,422 £17,457 12.3 yrs £10,993
7 kW 7449 kWh 5438 kWh 2011 kWh £1,458 £201 £1,660 £19,492 11.7 yrs £13,700
8 kW 8513 kWh 6215 kWh 2299 kWh £1,667 £230 £1,897 £21,526 11.3 yrs £16,407

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: £1,203, Upfront: £17,173, Break-even: 14.3 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2128 kWh 1596 kWh 532 kWh £428 £53 £481 £11,069 23.0 yrs £-1,443
3 kW 3193 kWh 2394 kWh 798 kWh £642 £80 £722 £13,104 18.1 yrs £1,336
4 kW 4257 kWh 3193 kWh 1064 kWh £856 £106 £963 £15,138 15.7 yrs £4,115
5 kW 5321 kWh 3991 kWh 1330 kWh £1,070 £133 £1,203 £17,173 14.3 yrs £6,894
6 kW 6385 kWh 4789 kWh 1596 kWh £1,284 £160 £1,444 £19,207 13.3 yrs £9,672
7 kW 7449 kWh 5587 kWh 1862 kWh £1,498 £186 £1,685 £21,242 12.6 yrs £12,451
8 kW 8513 kWh 6385 kWh 2128 kWh £1,712 £213 £1,925 £23,276 12.1 yrs £15,230

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: £1,221, Upfront: £19,623, Break-even: 16.1 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2128 kWh 1639 kWh 490 kWh £440 £49 £488 £13,519 27.7 yrs £-3,749
3 kW 3193 kWh 2458 kWh 734 kWh £659 £73 £733 £15,554 21.2 yrs £-899
4 kW 4257 kWh 3278 kWh 979 kWh £879 £98 £977 £17,588 18.0 yrs £1,951
5 kW 5321 kWh 4097 kWh 1224 kWh £1,099 £122 £1,221 £19,623 16.1 yrs £4,802
6 kW 6385 kWh 4916 kWh 1469 kWh £1,319 £147 £1,465 £21,657 14.8 yrs £7,652
7 kW 7449 kWh 5736 kWh 1713 kWh £1,538 £171 £1,710 £23,692 13.9 yrs £10,502
8 kW 8513 kWh 6555 kWh 1958 kWh £1,758 £196 £1,954 £25,726 13.2 yrs £13,353

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 EX24

Figures below are tailored to EX24 — click through for full league tables.

Big-Roof Britain Rank #196 of 2182
6.2 kWp (UK avg 5.1 kWp)
~13 panels (≈430 W)
Solar Payback Index Rank #158 of 2997
9.9 years (UK avg 11.3 years)
~£1,229 /yr • £12,207 upfront
Standing-Charge Drag Rank #562 of 2997
16.0% (UK avg 21.7%) drag on savings
£197 fixed • ~£1,229 /yr value

Your Area at a Glance

Your Electricity Rate
26.82p/kWh
Daily Fixed Charge
54.03p/day
Local Sunshine
1064kWh/kW
A 1 kW system generates ~1064 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: 69% • Flats: 6% • Bungalows: 25% Based on 1,100 properties

Coverage

East Devon (100%)

Areas Covered

Coly Valley, Seaton, Newbridges

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 Southern Western

EX12 (East Devon)
≈3.7 km away
Local sunshine: ~1,064 kWh/kWp · -0% vs EX24
EX13 (East Devon)
≈6.3 km away
Local sunshine: ~1,043 kWh/kWp · -2% vs EX24
DT7 (Dorset)
≈9.3 km away
Local sunshine: ~1,043 kWh/kWp · -2% vs EX24
EX14 (East Devon)
≈10.9 km away
Local sunshine: ~1,037 kWh/kWp · -3% vs EX24
EX10 (East Devon)
≈13.1 km away
Local sunshine: ~1,038 kWh/kWp · -2% vs EX24
EX11 (East Devon)
≈14.8 km away
Local sunshine: ~1,013 kWh/kWp · -5% vs EX24

Similar sunshine across the UK

CT1 (Canterbury)
~1,063 kWh/kWp · -0% vs EX24
SO19 (Southampton)
~1,063 kWh/kWp · -0% vs EX24
CO1 (Colchester)
~1,062 kWh/kWp · -0% vs EX24