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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in EX8 (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
£866
What you save every year
Profit Over 25 Years
£11,490
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 1036 kWh/kW — 23 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 1036 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)
1036 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: £866, 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 2072 kWh 829 kWh 1243 kWh £222 £124 £347 £4,069 11.7 yrs £2,863
3 kW 3108 kWh 1243 kWh 1865 kWh £333 £186 £520 £6,104 11.7 yrs £4,294
4 kW 4144 kWh 1658 kWh 2486 kWh £445 £249 £693 £8,138 11.7 yrs £5,726
5 kW 5180 kWh 2072 kWh 3108 kWh £556 £311 £866 £10,173 11.7 yrs £7,157
6 kW 6216 kWh 2486 kWh 3729 kWh £667 £373 £1,040 £12,207 11.7 yrs £8,589
7 kW 7252 kWh 2901 kWh 4351 kWh £778 £435 £1,213 £14,242 11.7 yrs £10,020
8 kW 8288 kWh 3315 kWh 4973 kWh £889 £497 £1,386 £16,276 11.7 yrs £11,451

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: £1,041, 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 2072 kWh 1243 kWh 829 kWh £333 £83 £416 £6,169 14.8 yrs £2,157
3 kW 3108 kWh 1865 kWh 1243 kWh £500 £124 £624 £8,204 13.1 yrs £4,285
4 kW 4144 kWh 2486 kWh 1658 kWh £667 £166 £833 £10,238 12.3 yrs £6,414
5 kW 5180 kWh 3108 kWh 2072 kWh £834 £207 £1,041 £12,273 11.8 yrs £8,542
6 kW 6216 kWh 3729 kWh 2486 kWh £1,000 £249 £1,249 £14,307 11.5 yrs £10,671
7 kW 7252 kWh 4351 kWh 2901 kWh £1,167 £290 £1,457 £16,342 11.2 yrs £12,799
8 kW 8288 kWh 4973 kWh 3315 kWh £1,334 £332 £1,665 £18,376 11.0 yrs £14,927

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: £1,128, 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 2072 kWh 1450 kWh 622 kWh £389 £62 £451 £7,569 16.8 yrs £1,454
3 kW 3108 kWh 2176 kWh 932 kWh £583 £93 £677 £9,604 14.2 yrs £3,931
4 kW 4144 kWh 2901 kWh 1243 kWh £778 £124 £902 £11,638 12.9 yrs £6,408
5 kW 5180 kWh 3626 kWh 1554 kWh £972 £155 £1,128 £13,673 12.1 yrs £8,885
6 kW 6216 kWh 4351 kWh 1865 kWh £1,167 £186 £1,353 £15,707 11.6 yrs £11,362
7 kW 7252 kWh 5076 kWh 2176 kWh £1,361 £218 £1,579 £17,742 11.2 yrs £13,839
8 kW 8288 kWh 5801 kWh 2486 kWh £1,556 £249 £1,805 £19,776 11.0 yrs £16,315

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: £1,154, Upfront: £15,423, Break-even: 13.4 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2072 kWh 1513 kWh 559 kWh £406 £56 £462 £9,319 20.2 yrs £-87
3 kW 3108 kWh 2269 kWh 839 kWh £608 £84 £692 £11,354 16.4 yrs £2,494
4 kW 4144 kWh 3025 kWh 1119 kWh £811 £112 £923 £13,388 14.5 yrs £5,076
5 kW 5180 kWh 3781 kWh 1399 kWh £1,014 £140 £1,154 £15,423 13.4 yrs £7,657
6 kW 6216 kWh 4538 kWh 1678 kWh £1,217 £168 £1,385 £17,457 12.6 yrs £10,239
7 kW 7252 kWh 5294 kWh 1958 kWh £1,420 £196 £1,616 £19,492 12.1 yrs £12,820
8 kW 8288 kWh 6050 kWh 2238 kWh £1,623 £224 £1,846 £21,526 11.7 yrs £15,402

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: £1,171, Upfront: £17,173, Break-even: 14.7 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2072 kWh 1554 kWh 518 kWh £417 £52 £469 £11,069 23.6 yrs £-1,698
3 kW 3108 kWh 2331 kWh 777 kWh £625 £78 £703 £13,104 18.6 yrs £954
4 kW 4144 kWh 3108 kWh 1036 kWh £834 £104 £937 £15,138 16.2 yrs £3,605
5 kW 5180 kWh 3885 kWh 1295 kWh £1,042 £129 £1,171 £17,173 14.7 yrs £6,256
6 kW 6216 kWh 4662 kWh 1554 kWh £1,250 £155 £1,406 £19,207 13.7 yrs £8,907
7 kW 7252 kWh 5439 kWh 1813 kWh £1,459 £181 £1,640 £21,242 13.0 yrs £11,558
8 kW 8288 kWh 6216 kWh 2072 kWh £1,667 £207 £1,874 £23,276 12.4 yrs £14,209

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: £1,189, 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 2072 kWh 1595 kWh 477 kWh £428 £48 £476 £13,519 28.4 yrs £-4,008
3 kW 3108 kWh 2393 kWh 715 kWh £642 £71 £713 £15,554 21.8 yrs £-1,287
4 kW 4144 kWh 3191 kWh 953 kWh £856 £95 £951 £17,588 18.5 yrs £1,434
5 kW 5180 kWh 3988 kWh 1191 kWh £1,070 £119 £1,189 £19,623 16.5 yrs £4,154
6 kW 6216 kWh 4786 kWh 1430 kWh £1,284 £143 £1,427 £21,657 15.2 yrs £6,875
7 kW 7252 kWh 5584 kWh 1668 kWh £1,498 £167 £1,664 £23,692 14.2 yrs £9,596
8 kW 8288 kWh 6382 kWh 1906 kWh £1,712 £191 £1,902 £25,726 13.5 yrs £12,317

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 EX8

Figures below are tailored to EX8 — click through for full league tables.

Big-Roof Britain Rank #1011 of 2182
5.0 kWp (UK avg 5.1 kWp)
~11 panels (≈430 W)
Solar Payback Index Rank #265 of 2997
10.2 years (UK avg 11.3 years)
~£997 /yr • £10,173 upfront
Standing-Charge Drag Rank #1359 of 2997
19.8% (UK avg 21.7%) drag on savings
£197 fixed • ~£997 /yr value

Your Area at a Glance

Your Electricity Rate
26.82p/kWh
Daily Fixed Charge
54.03p/day
Local Sunshine
1036kWh/kW
A 1 kW system generates ~1036 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: 55% • Flats: 29% • Bungalows: 14% Based on 11,338 properties

Coverage

East Devon (100%)

Areas Covered

Exmouth Town, Exmouth Littleham, Exmouth Halsdon, Exmouth Brixington, Exmouth Withycombe Raleigh, Woodbury & Lympstone

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

EX9 (East Devon)
≈5.7 km away
Local sunshine: ~1,041 kWh/kWp · +1% vs EX8
EX7 (Teignbridge)
≈6.6 km away
Local sunshine: ~1,027 kWh/kWp · -1% vs EX8
EX3 (Exeter)
≈8.1 km away
Local sunshine: ~1,031 kWh/kWp · -0% vs EX8
TQ14 (Teignbridge)
≈10.8 km away
Local sunshine: ~1,011 kWh/kWp · -2% vs EX8
EX2 (Exeter)
≈12.7 km away
Local sunshine: ~1,038 kWh/kWp · +0% vs EX8
EX10 (East Devon)
≈13.7 km away
Local sunshine: ~1,038 kWh/kWp · +0% vs EX8

Similar sunshine across the UK

IP6 (Mid Suffolk)
~1,036 kWh/kWp · -0% vs EX8
CF62 (Vale of Glamorgan)
~1,036 kWh/kWp · -0% vs EX8
CM98 (Chelmsford)
~1,036 kWh/kWp · +0% vs EX8