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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in EX17 (Mid Devon)

See if solar pays off for you in Mid 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
12.1 years
After this, it's pure profit
Upfront Cost
£12,207
What you pay to get started
Annual Benefit
£1,007
What you save every year
Profit Over 25 Years
£12,974
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 1004 kWh/kW — 10 below 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 1004 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)
1004 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: £839, Upfront: £10,173, 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 2007 kWh 803 kWh 1204 kWh £215 £120 £336 £4,069 12.1 yrs £2,646
3 kW 3011 kWh 1204 kWh 1806 kWh £323 £181 £504 £6,104 12.1 yrs £3,969
4 kW 4014 kWh 1606 kWh 2408 kWh £431 £241 £671 £8,138 12.1 yrs £5,292
5 kW 5018 kWh 2007 kWh 3011 kWh £538 £301 £839 £10,173 12.1 yrs £6,614
6 kW 6021 kWh 2408 kWh 3613 kWh £646 £361 £1,007 £12,207 12.1 yrs £7,937
7 kW 7025 kWh 2810 kWh 4215 kWh £754 £421 £1,175 £14,242 12.1 yrs £9,260
8 kW 8028 kWh 3211 kWh 4817 kWh £861 £482 £1,343 £16,276 12.1 yrs £10,583

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: £1,008, Upfront: £12,273, Break-even: 12.2 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2007 kWh 1204 kWh 803 kWh £323 £80 £403 £6,169 15.3 yrs £1,896
3 kW 3011 kWh 1806 kWh 1204 kWh £484 £120 £605 £8,204 13.6 yrs £3,894
4 kW 4014 kWh 2408 kWh 1606 kWh £646 £161 £807 £10,238 12.7 yrs £5,892
5 kW 5018 kWh 3011 kWh 2007 kWh £807 £201 £1,008 £12,273 12.2 yrs £7,890
6 kW 6021 kWh 3613 kWh 2408 kWh £969 £241 £1,210 £14,307 11.8 yrs £9,888
7 kW 7025 kWh 4215 kWh 2810 kWh £1,130 £281 £1,411 £16,342 11.6 yrs £11,887
8 kW 8028 kWh 4817 kWh 3211 kWh £1,292 £321 £1,613 £18,376 11.4 yrs £13,885

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: £1,093, Upfront: £13,673, Break-even: 12.5 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2007 kWh 1405 kWh 602 kWh £377 £60 £437 £7,569 17.3 yrs £1,171
3 kW 3011 kWh 2107 kWh 903 kWh £565 £90 £656 £9,604 14.7 yrs £3,507
4 kW 4014 kWh 2810 kWh 1204 kWh £754 £120 £874 £11,638 13.3 yrs £5,843
5 kW 5018 kWh 3512 kWh 1505 kWh £942 £151 £1,093 £13,673 12.5 yrs £8,178
6 kW 6021 kWh 4215 kWh 1806 kWh £1,130 £181 £1,311 £15,707 12.0 yrs £10,514
7 kW 7025 kWh 4917 kWh 2107 kWh £1,319 £211 £1,530 £17,742 11.6 yrs £12,850
8 kW 8028 kWh 5620 kWh 2408 kWh £1,507 £241 £1,748 £19,776 11.3 yrs £15,185

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: £1,118, Upfront: £15,423, Break-even: 13.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2007 kWh 1465 kWh 542 kWh £393 £54 £447 £9,319 20.8 yrs £-376
3 kW 3011 kWh 2198 kWh 813 kWh £589 £81 £671 £11,354 16.9 yrs £2,061
4 kW 4014 kWh 2930 kWh 1084 kWh £786 £108 £894 £13,388 15.0 yrs £4,498
5 kW 5018 kWh 3663 kWh 1355 kWh £982 £135 £1,118 £15,423 13.8 yrs £6,935
6 kW 6021 kWh 4395 kWh 1626 kWh £1,179 £163 £1,341 £17,457 13.0 yrs £9,372
7 kW 7025 kWh 5128 kWh 1897 kWh £1,375 £190 £1,565 £19,492 12.5 yrs £11,809
8 kW 8028 kWh 5861 kWh 2168 kWh £1,572 £217 £1,789 £21,526 12.0 yrs £14,246

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: £1,135, Upfront: £17,173, Break-even: 15.1 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2007 kWh 1505 kWh 502 kWh £404 £50 £454 £11,069 24.4 yrs £-1,991
3 kW 3011 kWh 2258 kWh 753 kWh £606 £75 £681 £13,104 19.2 yrs £513
4 kW 4014 kWh 3011 kWh 1004 kWh £807 £100 £908 £15,138 16.7 yrs £3,018
5 kW 5018 kWh 3763 kWh 1254 kWh £1,009 £125 £1,135 £17,173 15.1 yrs £5,522
6 kW 6021 kWh 4516 kWh 1505 kWh £1,211 £151 £1,362 £19,207 14.1 yrs £8,027
7 kW 7025 kWh 5269 kWh 1756 kWh £1,413 £176 £1,589 £21,242 13.4 yrs £10,531
8 kW 8028 kWh 6021 kWh 2007 kWh £1,615 £201 £1,816 £23,276 12.8 yrs £13,036

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: £1,152, Upfront: £19,623, Break-even: 17.0 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2007 kWh 1545 kWh 462 kWh £414 £46 £461 £13,519 29.3 yrs £-4,306
3 kW 3011 kWh 2318 kWh 692 kWh £622 £69 £691 £15,554 22.5 yrs £-1,734
4 kW 4014 kWh 3091 kWh 923 kWh £829 £92 £921 £17,588 19.1 yrs £838
5 kW 5018 kWh 3864 kWh 1154 kWh £1,036 £115 £1,152 £19,623 17.0 yrs £3,410
6 kW 6021 kWh 4636 kWh 1385 kWh £1,243 £138 £1,382 £21,657 15.7 yrs £5,982
7 kW 7025 kWh 5409 kWh 1616 kWh £1,451 £162 £1,612 £23,692 14.7 yrs £8,554
8 kW 8028 kWh 6182 kWh 1846 kWh £1,658 £185 £1,843 £25,726 14.0 yrs £11,126

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 EX17

Figures below are tailored to EX17 — click through for full league tables.

Big-Roof Britain Rank #512 of 2182
5.6 kWp (UK avg 5.1 kWp)
~12 panels (≈430 W)
Solar Payback Index Rank #511 of 2997
10.5 years (UK avg 11.3 years)
~£1,159 /yr • £12,207 upfront
Standing-Charge Drag Rank #725 of 2997
17.0% (UK avg 21.7%) drag on savings
£197 fixed • ~£1,159 /yr value

Your Area at a Glance

Your Electricity Rate
26.82p/kWh
Daily Fixed Charge
54.03p/day
Local Sunshine
1004kWh/kW
A 1 kW system generates ~1004 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: 72% • Flats: 12% • Bungalows: 16% Based on 5,540 properties

Coverage

Mid Devon (95%)|West Devon (3%)|North Devon (2%)

Areas Covered

Crediton Boniface, Sandford & Creedy, Upper Yeo & Taw, Crediton Lawrence, Yeo, Way, Taw Vale, Drewsteignton + 4 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

EX4 (Exeter)
≈12.1 km away
Local sunshine: ~1,015 kWh/kWp · +1% vs EX17
EX1 (Exeter)
≈12.7 km away
Local sunshine: ~1,020 kWh/kWp · +2% vs EX17
EX2 (Exeter)
≈13.6 km away
Local sunshine: ~1,038 kWh/kWp · +3% vs EX17
EX6 (Teignbridge)
≈14.1 km away
Local sunshine: ~998 kWh/kWp · -1% vs EX17
EX5 (East Devon)
≈17.7 km away
Local sunshine: ~1,028 kWh/kWp · +2% vs EX17
EX16 (Mid Devon)
≈17.8 km away
Local sunshine: ~997 kWh/kWp · -1% vs EX17

Similar sunshine across the UK

NN10 (North Northamptonshire)
~1,003 kWh/kWp · -0% vs EX17
CM23 (East Hertfordshire)
~1,004 kWh/kWp · +0% vs EX17
PE99 (Peterborough)
~1,004 kWh/kWp · +0% vs EX17