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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in CV21 (Rugby)

See if solar pays off for you in Rugby — 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
12.9 years
After this, it's pure profit
Upfront Cost
£10,173
What you pay to get started
Annual Benefit
£789
What you save every year
Profit Over 25 Years
£9,551
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 973 kWh/kW — 5 above 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 973 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)
973 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: £789, Upfront: £10,173, Break-even: 12.9 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1946 kWh 778 kWh 1167 kWh £199 £117 £316 £4,069 12.9 yrs £2,242
3 kW 2918 kWh 1167 kWh 1751 kWh £298 £175 £473 £6,104 12.9 yrs £3,364
4 kW 3891 kWh 1556 kWh 2335 kWh £398 £233 £631 £8,138 12.9 yrs £4,485
5 kW 4864 kWh 1946 kWh 2918 kWh £497 £292 £789 £10,173 12.9 yrs £5,606
6 kW 5837 kWh 2335 kWh 3502 kWh £597 £350 £947 £12,207 12.9 yrs £6,727
7 kW 6810 kWh 2724 kWh 4086 kWh £696 £409 £1,105 £14,242 12.9 yrs £7,849
8 kW 7782 kWh 3113 kWh 4669 kWh £795 £467 £1,262 £16,276 12.9 yrs £8,970

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: £940, Upfront: £12,273, Break-even: 13.1 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1946 kWh 1167 kWh 778 kWh £298 £78 £376 £6,169 16.4 yrs £1,353
3 kW 2918 kWh 1751 kWh 1167 kWh £447 £117 £564 £8,204 14.5 yrs £3,079
4 kW 3891 kWh 2335 kWh 1556 kWh £597 £156 £752 £10,238 13.6 yrs £4,805
5 kW 4864 kWh 2918 kWh 1946 kWh £746 £195 £940 £12,273 13.1 yrs £6,531
6 kW 5837 kWh 3502 kWh 2335 kWh £895 £233 £1,128 £14,307 12.7 yrs £8,258
7 kW 6810 kWh 4086 kWh 2724 kWh £1,044 £272 £1,316 £16,342 12.4 yrs £9,984
8 kW 7782 kWh 4669 kWh 3113 kWh £1,193 £311 £1,504 £18,376 12.2 yrs £11,710

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: £1,016, Upfront: £13,673, Break-even: 13.5 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1946 kWh 1362 kWh 584 kWh £348 £58 £406 £7,569 18.6 yrs £558
3 kW 2918 kWh 2043 kWh 876 kWh £522 £88 £610 £9,604 15.8 yrs £2,587
4 kW 3891 kWh 2724 kWh 1167 kWh £696 £117 £813 £11,638 14.3 yrs £4,615
5 kW 4864 kWh 3405 kWh 1459 kWh £870 £146 £1,016 £13,673 13.5 yrs £6,644
6 kW 5837 kWh 4086 kWh 1751 kWh £1,044 £175 £1,219 £15,707 12.9 yrs £8,673
7 kW 6810 kWh 4767 kWh 2043 kWh £1,218 £204 £1,422 £17,742 12.5 yrs £10,702
8 kW 7782 kWh 5448 kWh 2335 kWh £1,392 £233 £1,625 £19,776 12.2 yrs £12,731

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: £1,039, Upfront: £15,423, Break-even: 14.9 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1946 kWh 1420 kWh 525 kWh £363 £53 £415 £9,319 22.4 yrs £-1,011
3 kW 2918 kWh 2130 kWh 788 kWh £544 £79 £623 £11,354 18.2 yrs £1,109
4 kW 3891 kWh 2841 kWh 1051 kWh £726 £105 £831 £13,388 16.1 yrs £3,228
5 kW 4864 kWh 3551 kWh 1313 kWh £907 £131 £1,039 £15,423 14.9 yrs £5,348
6 kW 5837 kWh 4261 kWh 1576 kWh £1,089 £158 £1,246 £17,457 14.0 yrs £7,468
7 kW 6810 kWh 4971 kWh 1839 kWh £1,270 £184 £1,454 £19,492 13.4 yrs £9,587
8 kW 7782 kWh 5681 kWh 2101 kWh £1,452 £210 £1,662 £21,526 13.0 yrs £11,707

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: £1,054, Upfront: £17,173, Break-even: 16.3 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1946 kWh 1459 kWh 486 kWh £373 £49 £421 £11,069 26.3 yrs £-2,640
3 kW 2918 kWh 2189 kWh 730 kWh £559 £73 £632 £13,104 20.7 yrs £-460
4 kW 3891 kWh 2918 kWh 973 kWh £746 £97 £843 £15,138 18.0 yrs £1,720
5 kW 4864 kWh 3648 kWh 1216 kWh £932 £122 £1,054 £17,173 16.3 yrs £3,901
6 kW 5837 kWh 4378 kWh 1459 kWh £1,118 £146 £1,264 £19,207 15.2 yrs £6,081
7 kW 6810 kWh 5107 kWh 1702 kWh £1,305 £170 £1,475 £21,242 14.4 yrs £8,261
8 kW 7782 kWh 5837 kWh 1946 kWh £1,491 £195 £1,686 £23,276 13.8 yrs £10,441

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: £1,069, Upfront: £19,623, Break-even: 18.4 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1946 kWh 1498 kWh 447 kWh £383 £45 £428 £13,519 31.6 yrs £-4,969
3 kW 2918 kWh 2247 kWh 671 kWh £574 £67 £641 £15,554 24.3 yrs £-2,728
4 kW 3891 kWh 2996 kWh 895 kWh £766 £89 £855 £17,588 20.6 yrs £-488
5 kW 4864 kWh 3745 kWh 1119 kWh £957 £112 £1,069 £19,623 18.4 yrs £1,753
6 kW 5837 kWh 4494 kWh 1342 kWh £1,148 £134 £1,283 £21,657 16.9 yrs £3,994
7 kW 6810 kWh 5243 kWh 1566 kWh £1,340 £157 £1,496 £23,692 15.8 yrs £6,234
8 kW 7782 kWh 5992 kWh 1790 kWh £1,531 £179 £1,710 £25,726 15.0 yrs £8,475

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 CV21

Figures below are tailored to CV21 — click through for full league tables.

Big-Roof Britain Rank #1841 of 2182
4.4 kWp (UK avg 5.1 kWp)
~9 panels (≈430 W)
Solar Payback Index Rank #1570 of 2997
11.3 years (UK avg 11.3 years)
~£902 /yr • £10,173 upfront
Standing-Charge Drag Rank #1386 of 2997
19.9% (UK avg 21.7%) drag on savings
£179 fixed • ~£902 /yr value

Your Area at a Glance

Your Electricity Rate
25.55p/kWh
Daily Fixed Charge
49.09p/day
Local Sunshine
973kWh/kW
A 1 kW system generates ~973 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: 64% • Flats: 30% • Bungalows: 4% Based on 12,274 properties

Coverage

Rugby (93%)|Warwick (7%)

Areas Covered

Newbold and Brownsover, Benn, Eastlands, New Bilton, Hillmorton, Leamington Willes, Coton and Boughton, Paddox + 2 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 East Midlands

CV22 (Rugby)
≈2.8 km away
Local sunshine: ~973 kWh/kWp · -0% vs CV21
CV23 (Rugby)
≈3.8 km away
Local sunshine: ~974 kWh/kWp · +0% vs CV21
LE17 (Harborough)
≈10.7 km away
Local sunshine: ~967 kWh/kWp · -1% vs CV21
NN11 (West Northamptonshire)
≈14.4 km away
Local sunshine: ~990 kWh/kWp · +2% vs CV21
CV2 (Coventry)
≈15.4 km away
Local sunshine: ~968 kWh/kWp · -0% vs CV21
CV3 (Coventry)
≈15.6 km away
Local sunshine: ~961 kWh/kWp · -1% vs CV21

Similar sunshine across the UK

IP27 (West Suffolk)
~973 kWh/kWp · +0% vs CV21
WR99 (Worcester)
~972 kWh/kWp · -0% vs CV21
HU18 (East Riding of Yorkshire)
~973 kWh/kWp · +0% vs CV21