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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in EX36 (North Devon)

See if solar pays off for you in North 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
12.6 years
After this, it's pure profit
Upfront Cost
£12,207
What you pay to get started
Annual Benefit
£970
What you save every year
Profit Over 25 Years
£12,044
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 966 kWh/kW — 47 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 966 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)
966 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: £808, Upfront: £10,173, Break-even: 12.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1933 kWh 773 kWh 1160 kWh £207 £116 £323 £4,069 12.6 yrs £2,398
3 kW 2899 kWh 1160 kWh 1740 kWh £311 £174 £485 £6,104 12.6 yrs £3,597
4 kW 3866 kWh 1546 kWh 2320 kWh £415 £232 £647 £8,138 12.6 yrs £4,796
5 kW 4832 kWh 1933 kWh 2899 kWh £518 £290 £808 £10,173 12.6 yrs £5,995
6 kW 5799 kWh 2320 kWh 3479 kWh £622 £348 £970 £12,207 12.6 yrs £7,194
7 kW 6765 kWh 2706 kWh 4059 kWh £726 £406 £1,132 £14,242 12.6 yrs £8,393
8 kW 7732 kWh 3093 kWh 4639 kWh £829 £464 £1,293 £16,276 12.6 yrs £9,592

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: £971, Upfront: £12,273, Break-even: 12.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1933 kWh 1160 kWh 773 kWh £311 £77 £388 £6,169 15.9 yrs £1,598
3 kW 2899 kWh 1740 kWh 1160 kWh £467 £116 £583 £8,204 14.1 yrs £3,448
4 kW 3866 kWh 2320 kWh 1546 kWh £622 £155 £777 £10,238 13.2 yrs £5,297
5 kW 4832 kWh 2899 kWh 1933 kWh £778 £193 £971 £12,273 12.6 yrs £7,146
6 kW 5799 kWh 3479 kWh 2320 kWh £933 £232 £1,165 £14,307 12.3 yrs £8,995
7 kW 6765 kWh 4059 kWh 2706 kWh £1,089 £271 £1,359 £16,342 12.0 yrs £10,844
8 kW 7732 kWh 4639 kWh 3093 kWh £1,244 £309 £1,553 £18,376 11.8 yrs £12,694

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: £1,052, Upfront: £13,673, 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 1933 kWh 1353 kWh 580 kWh £363 £58 £421 £7,569 18.0 yrs £849
3 kW 2899 kWh 2030 kWh 870 kWh £544 £87 £631 £9,604 15.2 yrs £3,023
4 kW 3866 kWh 2706 kWh 1160 kWh £726 £116 £842 £11,638 13.8 yrs £5,197
5 kW 4832 kWh 3383 kWh 1450 kWh £907 £145 £1,052 £13,673 13.0 yrs £7,372
6 kW 5799 kWh 4059 kWh 1740 kWh £1,089 £174 £1,263 £15,707 12.4 yrs £9,546
7 kW 6765 kWh 4736 kWh 2030 kWh £1,270 £203 £1,473 £17,742 12.0 yrs £11,720
8 kW 7732 kWh 5412 kWh 2320 kWh £1,452 £232 £1,684 £19,776 11.7 yrs £13,895

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: £1,077, Upfront: £15,423, 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 1933 kWh 1411 kWh 522 kWh £378 £52 £431 £9,319 21.6 yrs £-706
3 kW 2899 kWh 2117 kWh 783 kWh £568 £78 £646 £11,354 17.6 yrs £1,566
4 kW 3866 kWh 2822 kWh 1044 kWh £757 £104 £861 £13,388 15.5 yrs £3,837
5 kW 4832 kWh 3528 kWh 1305 kWh £946 £130 £1,077 £15,423 14.3 yrs £6,109
6 kW 5799 kWh 4233 kWh 1566 kWh £1,135 £157 £1,292 £17,457 13.5 yrs £8,381
7 kW 6765 kWh 4939 kWh 1827 kWh £1,325 £183 £1,507 £19,492 12.9 yrs £10,653
8 kW 7732 kWh 5644 kWh 2088 kWh £1,514 £209 £1,723 £21,526 12.5 yrs £12,925

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: £1,093, Upfront: £17,173, Break-even: 15.7 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1933 kWh 1450 kWh 483 kWh £389 £48 £437 £11,069 25.3 yrs £-2,326
3 kW 2899 kWh 2175 kWh 725 kWh £583 £72 £656 £13,104 20.0 yrs £11
4 kW 3866 kWh 2899 kWh 966 kWh £778 £97 £874 £15,138 17.3 yrs £2,348
5 kW 4832 kWh 3624 kWh 1208 kWh £972 £121 £1,093 £17,173 15.7 yrs £4,684
6 kW 5799 kWh 4349 kWh 1450 kWh £1,166 £145 £1,311 £19,207 14.6 yrs £7,021
7 kW 6765 kWh 5074 kWh 1691 kWh £1,361 £169 £1,530 £21,242 13.9 yrs £9,358
8 kW 7732 kWh 5799 kWh 1933 kWh £1,555 £193 £1,749 £23,276 13.3 yrs £11,695

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: £1,109, Upfront: £19,623, Break-even: 17.7 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1933 kWh 1488 kWh 445 kWh £399 £44 £444 £13,519 30.5 yrs £-4,646
3 kW 2899 kWh 2233 kWh 667 kWh £599 £67 £665 £15,554 23.4 yrs £-2,244
4 kW 3866 kWh 2977 kWh 889 kWh £798 £89 £887 £17,588 19.8 yrs £158
5 kW 4832 kWh 3721 kWh 1111 kWh £998 £111 £1,109 £19,623 17.7 yrs £2,560
6 kW 5799 kWh 4465 kWh 1334 kWh £1,198 £133 £1,331 £21,657 16.3 yrs £4,961
7 kW 6765 kWh 5209 kWh 1556 kWh £1,397 £156 £1,553 £23,692 15.3 yrs £7,363
8 kW 7732 kWh 5954 kWh 1778 kWh £1,597 £178 £1,775 £25,726 14.5 yrs £9,765

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 EX36

Figures below are tailored to EX36 — click through for full league tables.

Big-Roof Britain Rank #413 of 2182
5.7 kWp (UK avg 5.1 kWp)
~12 panels (≈430 W)
Solar Payback Index Rank #1124 of 2997
10.9 years (UK avg 11.3 years)
~£1,116 /yr • £12,207 upfront
Standing-Charge Drag Rank #909 of 2997
17.7% (UK avg 21.7%) drag on savings
£197 fixed • ~£1,116 /yr value

Your Area at a Glance

Your Electricity Rate
26.82p/kWh
Daily Fixed Charge
54.03p/day
Local Sunshine
966kWh/kW
A 1 kW system generates ~966 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: 71% • Flats: 10% • Bungalows: 18% Based on 3,273 properties

Coverage

North Devon (100%)

Areas Covered

South Molton, Bishop's Nympton, North Molton, Chittlehampton, Chulmleigh, Witheridge, Dulverton & Exmoor

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

EX37 (North Devon)
≈9.7 km away
Local sunshine: ~964 kWh/kWp · -0% vs EX36
EX18 (North Devon)
≈12.8 km away
Local sunshine: ~979 kWh/kWp · +1% vs EX36
EX32 (North Devon)
≈16.6 km away
Local sunshine: ~971 kWh/kWp · +0% vs EX36
EX31 (North Devon)
≈18.4 km away
Local sunshine: ~986 kWh/kWp · +2% vs EX36
TA22 (Somerset)
≈20.1 km away
Local sunshine: ~959 kWh/kWp · -1% vs EX36
EX19 (Torridge)
≈21.9 km away
Local sunshine: ~958 kWh/kWp · -1% vs EX36

Similar sunshine across the UK

NG4 (Gedling)
~967 kWh/kWp · +0% vs EX36
YO16 (East Riding of Yorkshire)
~966 kWh/kWp · -0% vs EX36
LE87 (Leicester)
~966 kWh/kWp · -0% vs EX36