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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in EX14 (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
11.7 years
After this, it's pure profit
Upfront Cost
£10,173
What you pay to get started
Annual Benefit
£868
What you save every year
Profit Over 25 Years
£11,521
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 1037 kWh/kW — 24 above the regional median (1013).

Read the full story

A typical roof here lands around 5.0 kW, with most eligible homes comfortably fitting within 3–6 kW. Each kilowatt of panels produces roughly 1037 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)
1037 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: £868, Upfront: £10,173, Break-even: 11.7 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2075 kWh 830 kWh 1245 kWh £223 £124 £347 £4,069 11.7 yrs £2,873
3 kW 3112 kWh 1245 kWh 1867 kWh £334 £187 £521 £6,104 11.7 yrs £4,309
4 kW 4150 kWh 1660 kWh 2490 kWh £445 £249 £694 £8,138 11.7 yrs £5,746
5 kW 5187 kWh 2075 kWh 3112 kWh £556 £311 £868 £10,173 11.7 yrs £7,182
6 kW 6225 kWh 2490 kWh 3735 kWh £668 £373 £1,041 £12,207 11.7 yrs £8,619
7 kW 7262 kWh 2905 kWh 4357 kWh £779 £436 £1,215 £14,242 11.7 yrs £10,055
8 kW 8300 kWh 3320 kWh 4980 kWh £890 £498 £1,388 £16,276 11.7 yrs £11,492

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: £1,042, Upfront: £12,273, 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 2075 kWh 1245 kWh 830 kWh £334 £83 £417 £6,169 14.8 yrs £2,169
3 kW 3112 kWh 1867 kWh 1245 kWh £501 £124 £625 £8,204 13.1 yrs £4,303
4 kW 4150 kWh 2490 kWh 1660 kWh £668 £166 £834 £10,238 12.3 yrs £6,438
5 kW 5187 kWh 3112 kWh 2075 kWh £835 £207 £1,042 £12,273 11.8 yrs £8,572
6 kW 6225 kWh 3735 kWh 2490 kWh £1,002 £249 £1,251 £14,307 11.4 yrs £10,707
7 kW 7262 kWh 4357 kWh 2905 kWh £1,169 £290 £1,459 £16,342 11.2 yrs £12,841
8 kW 8300 kWh 4980 kWh 3320 kWh £1,336 £332 £1,668 £18,376 11.0 yrs £14,976

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: £1,129, Upfront: £13,673, Break-even: 12.1 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2075 kWh 1452 kWh 622 kWh £390 £62 £452 £7,569 16.8 yrs £1,467
3 kW 3112 kWh 2179 kWh 934 kWh £584 £93 £678 £9,604 14.2 yrs £3,950
4 kW 4150 kWh 2905 kWh 1245 kWh £779 £124 £904 £11,638 12.9 yrs £6,434
5 kW 5187 kWh 3631 kWh 1556 kWh £974 £156 £1,129 £13,673 12.1 yrs £8,917
6 kW 6225 kWh 4357 kWh 1867 kWh £1,169 £187 £1,355 £15,707 11.6 yrs £11,401
7 kW 7262 kWh 5084 kWh 2179 kWh £1,363 £218 £1,581 £17,742 11.2 yrs £13,884
8 kW 8300 kWh 5810 kWh 2490 kWh £1,558 £249 £1,807 £19,776 10.9 yrs £16,368

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: £1,156, Upfront: £15,423, Break-even: 13.3 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2075 kWh 1515 kWh 560 kWh £406 £56 £462 £9,319 20.2 yrs £-74
3 kW 3112 kWh 2272 kWh 840 kWh £609 £84 £693 £11,354 16.4 yrs £2,514
4 kW 4150 kWh 3029 kWh 1120 kWh £812 £112 £925 £13,388 14.5 yrs £5,103
5 kW 5187 kWh 3787 kWh 1401 kWh £1,016 £140 £1,156 £15,423 13.3 yrs £7,691
6 kW 6225 kWh 4544 kWh 1681 kWh £1,219 £168 £1,387 £17,457 12.6 yrs £10,279
7 kW 7262 kWh 5301 kWh 1961 kWh £1,422 £196 £1,618 £19,492 12.0 yrs £12,867
8 kW 8300 kWh 6059 kWh 2241 kWh £1,625 £224 £1,849 £21,526 11.6 yrs £15,455

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: £1,173, Upfront: £17,173, Break-even: 14.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2075 kWh 1556 kWh 519 kWh £417 £52 £469 £11,069 23.6 yrs £-1,684
3 kW 3112 kWh 2334 kWh 778 kWh £626 £78 £704 £13,104 18.6 yrs £974
4 kW 4150 kWh 3112 kWh 1037 kWh £835 £104 £938 £15,138 16.1 yrs £3,632
5 kW 5187 kWh 3891 kWh 1297 kWh £1,043 £130 £1,173 £17,173 14.6 yrs £6,290
6 kW 6225 kWh 4669 kWh 1556 kWh £1,252 £156 £1,408 £19,207 13.6 yrs £8,948
7 kW 7262 kWh 5447 kWh 1816 kWh £1,461 £182 £1,642 £21,242 12.9 yrs £11,606
8 kW 8300 kWh 6225 kWh 2075 kWh £1,669 £207 £1,877 £23,276 12.4 yrs £14,264

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: £1,191, Upfront: £19,623, Break-even: 16.5 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2075 kWh 1598 kWh 477 kWh £429 £48 £476 £13,519 28.4 yrs £-3,994
3 kW 3112 kWh 2397 kWh 716 kWh £643 £72 £714 £15,554 21.8 yrs £-1,267
4 kW 4150 kWh 3195 kWh 954 kWh £857 £95 £952 £17,588 18.5 yrs £1,461
5 kW 5187 kWh 3994 kWh 1193 kWh £1,071 £119 £1,191 £19,623 16.5 yrs £4,189
6 kW 6225 kWh 4793 kWh 1432 kWh £1,286 £143 £1,429 £21,657 15.2 yrs £6,917
7 kW 7262 kWh 5592 kWh 1670 kWh £1,500 £167 £1,667 £23,692 14.2 yrs £9,644
8 kW 8300 kWh 6391 kWh 1909 kWh £1,714 £191 £1,905 £25,726 13.5 yrs £12,372

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 EX14

Figures below are tailored to EX14 — click through for full league tables.

Big-Roof Britain Rank #975 of 2182
5.1 kWp (UK avg 5.1 kWp)
~11 panels (≈430 W)
Solar Payback Index Rank #262 of 2997
10.2 years (UK avg 11.3 years)
~£999 /yr • £10,173 upfront
Standing-Charge Drag Rank #1339 of 2997
19.7% (UK avg 21.7%) drag on savings
£197 fixed • ~£999 /yr value

Your Area at a Glance

Your Electricity Rate
26.82p/kWh
Daily Fixed Charge
54.03p/day
Local Sunshine
1037kWh/kW
A 1 kW system generates ~1037 kWh per year. A typical home uses ~2,700 kWh per year.
Typical System Size
5.0kW
For houses & bungalows in this area

Local Property Data

Property Types

Houses: 62% • Flats: 14% • Bungalows: 23% Based on 6,771 properties

Coverage

East Devon (100%)

Areas Covered

Dunkeswell & Otterhead, Honiton St Michael's, Honiton St Paul's, Feniton, Tale Vale, Coly Valley, Ottery St Mary, Yarty + 3 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 Southern Western

EX11 (East Devon)
≈8.2 km away
Local sunshine: ~1,013 kWh/kWp · -2% vs EX14
EX24 (East Devon)
≈10.9 km away
Local sunshine: ~1,064 kWh/kWp · +3% vs EX14
EX10 (East Devon)
≈12.8 km away
Local sunshine: ~1,038 kWh/kWp · +0% vs EX14
EX13 (East Devon)
≈13.1 km away
Local sunshine: ~1,043 kWh/kWp · +1% vs EX14
EX12 (East Devon)
≈13.4 km away
Local sunshine: ~1,064 kWh/kWp · +3% vs EX14
EX15 (Mid Devon)
≈14.5 km away
Local sunshine: ~985 kWh/kWp · -5% vs EX14

Similar sunshine across the UK

SO18 (Southampton)
~1,037 kWh/kWp · -0% vs EX14
RH14 (Horsham)
~1,037 kWh/kWp · -0% vs EX14
SO14 (Southampton)
~1,037 kWh/kWp · -0% vs EX14