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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in DE65 (South Derbyshire)

See if solar pays off for you in South Derbyshire — 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
13.2 years
After this, it's pure profit
Upfront Cost
£10,173
What you pay to get started
Annual Benefit
£770
What you save every year
Profit Over 25 Years
£9,084
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 East Midlands, the current unit rate is 25.55p/kWh with a 49.09p/day standing charge. Your postcode’s south-facing sunshine yield is 950 kWh/kW — 18 below the regional median (968).

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 950 kWh per year on a south-facing roof. We value self-used electricity at 25.6p and exported surplus at a baseline 10p via SEG. Use the calculator above for your exact tariff.

Unit rate
25.6p/kWh
Standing charge
49.1p/day
Sunshine yield (south)
950 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: £770, Upfront: £10,173, Break-even: 13.2 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1900 kWh 760 kWh 1140 kWh £194 £114 £308 £4,069 13.2 yrs £2,093
3 kW 2849 kWh 1140 kWh 1710 kWh £291 £171 £462 £6,104 13.2 yrs £3,140
4 kW 3799 kWh 1520 kWh 2279 kWh £388 £228 £616 £8,138 13.2 yrs £4,186
5 kW 4749 kWh 1900 kWh 2849 kWh £485 £285 £770 £10,173 13.2 yrs £5,233
6 kW 5699 kWh 2279 kWh 3419 kWh £582 £342 £924 £12,207 13.2 yrs £6,279
7 kW 6648 kWh 2659 kWh 3989 kWh £679 £399 £1,078 £14,242 13.2 yrs £7,326
8 kW 7598 kWh 3039 kWh 4559 kWh £777 £456 £1,232 £16,276 13.2 yrs £8,372

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: £918, Upfront: £12,273, 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 1900 kWh 1140 kWh 760 kWh £291 £76 £367 £6,169 16.8 yrs £1,175
3 kW 2849 kWh 1710 kWh 1140 kWh £437 £114 £551 £8,204 14.9 yrs £2,812
4 kW 3799 kWh 2279 kWh 1520 kWh £582 £152 £734 £10,238 13.9 yrs £4,449
5 kW 4749 kWh 2849 kWh 1900 kWh £728 £190 £918 £12,273 13.4 yrs £6,086
6 kW 5699 kWh 3419 kWh 2279 kWh £874 £228 £1,102 £14,307 13.0 yrs £7,724
7 kW 6648 kWh 3989 kWh 2659 kWh £1,019 £266 £1,285 £16,342 12.7 yrs £9,361
8 kW 7598 kWh 4559 kWh 3039 kWh £1,165 £304 £1,469 £18,376 12.5 yrs £10,998

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: £992, Upfront: £13,673, 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 1900 kWh 1330 kWh 570 kWh £340 £57 £397 £7,569 19.1 yrs £365
3 kW 2849 kWh 1994 kWh 855 kWh £510 £85 £595 £9,604 16.1 yrs £2,298
4 kW 3799 kWh 2659 kWh 1140 kWh £679 £114 £793 £11,638 14.7 yrs £4,231
5 kW 4749 kWh 3324 kWh 1425 kWh £849 £142 £992 £13,673 13.8 yrs £6,163
6 kW 5699 kWh 3989 kWh 1710 kWh £1,019 £171 £1,190 £15,707 13.2 yrs £8,096
7 kW 6648 kWh 4654 kWh 1994 kWh £1,189 £199 £1,389 £17,742 12.8 yrs £10,028
8 kW 7598 kWh 5319 kWh 2279 kWh £1,359 £228 £1,587 £19,776 12.5 yrs £11,961

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: £1,014, Upfront: £15,423, Break-even: 15.2 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1900 kWh 1387 kWh 513 kWh £354 £51 £406 £9,319 23.0 yrs £-1,207
3 kW 2849 kWh 2080 kWh 769 kWh £531 £77 £608 £11,354 18.7 yrs £814
4 kW 3799 kWh 2773 kWh 1026 kWh £709 £103 £811 £13,388 16.5 yrs £2,835
5 kW 4749 kWh 3467 kWh 1282 kWh £886 £128 £1,014 £15,423 15.2 yrs £4,856
6 kW 5699 kWh 4160 kWh 1539 kWh £1,063 £154 £1,217 £17,457 14.3 yrs £6,878
7 kW 6648 kWh 4853 kWh 1795 kWh £1,240 £180 £1,420 £19,492 13.7 yrs £8,899
8 kW 7598 kWh 5547 kWh 2051 kWh £1,417 £205 £1,622 £21,526 13.3 yrs £10,920

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: £1,029, Upfront: £17,173, Break-even: 16.7 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1900 kWh 1425 kWh 475 kWh £364 £47 £411 £11,069 26.9 yrs £-2,839
3 kW 2849 kWh 2137 kWh 712 kWh £546 £71 £617 £13,104 21.2 yrs £-759
4 kW 3799 kWh 2849 kWh 950 kWh £728 £95 £823 £15,138 18.4 yrs £1,321
5 kW 4749 kWh 3562 kWh 1187 kWh £910 £119 £1,029 £17,173 16.7 yrs £3,402
6 kW 5699 kWh 4274 kWh 1425 kWh £1,092 £142 £1,234 £19,207 15.6 yrs £5,482
7 kW 6648 kWh 4986 kWh 1662 kWh £1,274 £166 £1,440 £21,242 14.7 yrs £7,562
8 kW 7598 kWh 5699 kWh 1900 kWh £1,456 £190 £1,646 £23,276 14.1 yrs £9,643

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: £1,043, Upfront: £19,623, Break-even: 18.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1900 kWh 1463 kWh 437 kWh £374 £44 £417 £13,519 32.4 yrs £-5,171
3 kW 2849 kWh 2194 kWh 655 kWh £561 £66 £626 £15,554 24.8 yrs £-3,032
4 kW 3799 kWh 2925 kWh 874 kWh £747 £87 £835 £17,588 21.1 yrs £-892
5 kW 4749 kWh 3657 kWh 1092 kWh £934 £109 £1,043 £19,623 18.8 yrs £1,247
6 kW 5699 kWh 4388 kWh 1311 kWh £1,121 £131 £1,252 £21,657 17.3 yrs £3,386
7 kW 6648 kWh 5119 kWh 1529 kWh £1,308 £153 £1,461 £23,692 16.2 yrs £5,526
8 kW 7598 kWh 5851 kWh 1748 kWh £1,495 £175 £1,670 £25,726 15.4 yrs £7,665

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 DE65

Figures below are tailored to DE65 — click through for full league tables.

Big-Roof Britain Rank #904 of 2182
5.2 kWp (UK avg 5.1 kWp)
~11 panels (≈430 W)
Solar Payback Index Rank #1748 of 2997
11.5 years (UK avg 11.3 years)
~£881 /yr • £10,173 upfront
Standing-Charge Drag Rank #1460 of 2997
20.3% (UK avg 21.7%) drag on savings
£179 fixed • ~£881 /yr value

Your Area at a Glance

Your Electricity Rate
25.55p/kWh
Daily Fixed Charge
49.09p/day
Local Sunshine
950kWh/kW
A 1 kW system generates ~950 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: 81% • Flats: 9% • Bungalows: 10% Based on 6,474 properties

Coverage

South Derbyshire (100%)

Areas Covered

Hilton, Hatton, Willington and Findern, Etwall, Repton

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 East Midlands

DE13 (East Staffordshire)
≈6.3 km away
Local sunshine: ~943 kWh/kWp · -1% vs DE65
DE14 (East Staffordshire)
≈6.6 km away
Local sunshine: ~938 kWh/kWp · -1% vs DE65
DE15 (East Staffordshire)
≈7.7 km away
Local sunshine: ~937 kWh/kWp · -1% vs DE65
DE23 (Derby)
≈9.3 km away
Local sunshine: ~953 kWh/kWp · +0% vs DE65
DE3 (Derby)
≈9.7 km away
Local sunshine: ~948 kWh/kWp · -0% vs DE65
DE22 (Derby)
≈11.2 km away
Local sunshine: ~946 kWh/kWp · -0% vs DE65

Similar sunshine across the UK

SA32 (Carmarthenshire)
~950 kWh/kWp · +0% vs DE65
SA37 (Pembrokeshire)
~950 kWh/kWp · -0% vs DE65
CA21 (Cumberland)
~950 kWh/kWp · +0% vs DE65