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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in EX12 (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
£14,484
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 — 50 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 2127 kWh 851 kWh 1276 kWh £228 £128 £356 £4,069 11.4 yrs £3,048
3 kW 3191 kWh 1276 kWh 1915 kWh £342 £191 £534 £6,104 11.4 yrs £4,573
4 kW 4255 kWh 1702 kWh 2553 kWh £456 £255 £712 £8,138 11.4 yrs £6,097
5 kW 5319 kWh 2127 kWh 3191 kWh £571 £319 £890 £10,173 11.4 yrs £7,621
6 kW 6382 kWh 2553 kWh 3829 kWh £685 £383 £1,068 £12,207 11.4 yrs £9,145
7 kW 7446 kWh 2978 kWh 4468 kWh £799 £447 £1,246 £14,242 11.4 yrs £10,670
8 kW 8510 kWh 3404 kWh 5106 kWh £913 £511 £1,423 £16,276 11.4 yrs £12,194

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 2127 kWh 1276 kWh 851 kWh £342 £85 £427 £6,169 14.4 yrs £2,380
3 kW 3191 kWh 1915 kWh 1276 kWh £514 £128 £641 £8,204 12.8 yrs £4,620
4 kW 4255 kWh 2553 kWh 1702 kWh £685 £170 £855 £10,238 12.0 yrs £6,860
5 kW 5319 kWh 3191 kWh 2127 kWh £856 £213 £1,069 £12,273 11.5 yrs £9,100
6 kW 6382 kWh 3829 kWh 2553 kWh £1,027 £255 £1,282 £14,307 11.2 yrs £11,339
7 kW 7446 kWh 4468 kWh 2978 kWh £1,198 £298 £1,496 £16,342 10.9 yrs £13,579
8 kW 8510 kWh 5106 kWh 3404 kWh £1,369 £340 £1,710 £18,376 10.7 yrs £15,819

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: £1,158, 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 2127 kWh 1489 kWh 638 kWh £399 £64 £463 £7,569 16.3 yrs £1,695
3 kW 3191 kWh 2234 kWh 957 kWh £599 £96 £695 £9,604 13.8 yrs £4,293
4 kW 4255 kWh 2978 kWh 1276 kWh £799 £128 £926 £11,638 12.6 yrs £6,891
5 kW 5319 kWh 3723 kWh 1596 kWh £999 £160 £1,158 £13,673 11.8 yrs £9,489
6 kW 6382 kWh 4468 kWh 1915 kWh £1,198 £191 £1,390 £15,707 11.3 yrs £12,086
7 kW 7446 kWh 5212 kWh 2234 kWh £1,398 £223 £1,621 £17,742 10.9 yrs £14,684
8 kW 8510 kWh 5957 kWh 2553 kWh £1,598 £255 £1,853 £19,776 10.7 yrs £17,282

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 2127 kWh 1553 kWh 574 kWh £417 £57 £474 £9,319 19.7 yrs £160
3 kW 3191 kWh 2330 kWh 862 kWh £625 £86 £711 £11,354 16.0 yrs £2,865
4 kW 4255 kWh 3106 kWh 1149 kWh £833 £115 £948 £13,388 14.1 yrs £5,570
5 kW 5319 kWh 3883 kWh 1436 kWh £1,041 £144 £1,185 £15,423 13.0 yrs £8,275
6 kW 6382 kWh 4659 kWh 1723 kWh £1,250 £172 £1,422 £17,457 12.3 yrs £10,981
7 kW 7446 kWh 5436 kWh 2010 kWh £1,458 £201 £1,659 £19,492 11.7 yrs £13,686
8 kW 8510 kWh 6212 kWh 2298 kWh £1,666 £230 £1,896 £21,526 11.4 yrs £16,391

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 2127 kWh 1596 kWh 532 kWh £428 £53 £481 £11,069 23.0 yrs £-1,447
3 kW 3191 kWh 2393 kWh 798 kWh £642 £80 £722 £13,104 18.2 yrs £1,330
4 kW 4255 kWh 3191 kWh 1064 kWh £856 £106 £962 £15,138 15.7 yrs £4,107
5 kW 5319 kWh 3989 kWh 1330 kWh £1,070 £133 £1,203 £17,173 14.3 yrs £6,883
6 kW 6382 kWh 4787 kWh 1596 kWh £1,284 £160 £1,443 £19,207 13.3 yrs £9,660
7 kW 7446 kWh 5584 kWh 1861 kWh £1,498 £186 £1,684 £21,242 12.6 yrs £12,437
8 kW 8510 kWh 6382 kWh 2127 kWh £1,712 £213 £1,924 £23,276 12.1 yrs £15,213

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 2127 kWh 1638 kWh 489 kWh £439 £49 £488 £13,519 27.7 yrs £-3,754
3 kW 3191 kWh 2457 kWh 734 kWh £659 £73 £732 £15,554 21.2 yrs £-905
4 kW 4255 kWh 3276 kWh 979 kWh £879 £98 £977 £17,588 18.0 yrs £1,943
5 kW 5319 kWh 4095 kWh 1223 kWh £1,098 £122 £1,221 £19,623 16.1 yrs £4,791
6 kW 6382 kWh 4914 kWh 1468 kWh £1,318 £147 £1,465 £21,657 14.8 yrs £7,639
7 kW 7446 kWh 5733 kWh 1713 kWh £1,538 £171 £1,709 £23,692 13.9 yrs £10,488
8 kW 8510 kWh 6552 kWh 1957 kWh £1,757 £196 £1,953 £25,726 13.2 yrs £13,336

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 EX12

Figures below are tailored to EX12 — click through for full league tables.

Big-Roof Britain Rank #826 of 2182
5.2 kWp (UK avg 5.1 kWp)
~11 panels (≈430 W)
Solar Payback Index Rank #157 of 2997
9.9 years (UK avg 11.3 years)
~£1,229 /yr • £12,207 upfront
Standing-Charge Drag Rank #564 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: 52% • Flats: 26% • Bungalows: 20% Based on 3,532 properties

Coverage

East Devon (100%)

Areas Covered

Seaton, Beer & Branscombe, Trinity, Coly Valley, 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

EX24 (East Devon)
≈3.7 km away
Local sunshine: ~1,064 kWh/kWp · +0% vs EX12
EX13 (East Devon)
≈9.3 km away
Local sunshine: ~1,043 kWh/kWp · -2% vs EX12
DT7 (Dorset)
≈9.7 km away
Local sunshine: ~1,043 kWh/kWp · -2% vs EX12
EX10 (East Devon)
≈11.8 km away
Local sunshine: ~1,038 kWh/kWp · -2% vs EX12
EX14 (East Devon)
≈13.4 km away
Local sunshine: ~1,037 kWh/kWp · -2% vs EX12
EX11 (East Devon)
≈15.4 km away
Local sunshine: ~1,013 kWh/kWp · -5% vs EX12

Similar sunshine across the UK

CT1 (Canterbury)
~1,063 kWh/kWp · -0% vs EX12
SO19 (Southampton)
~1,063 kWh/kWp · -0% vs EX12
CO1 (Colchester)
~1,062 kWh/kWp · -0% vs EX12