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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in TR6 (Cornwall)

See if solar pays off for you in Cornwall — 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
11.8 years
After this, it's pure profit
Upfront Cost
£12,207
What you pay to get started
Annual Benefit
£1,036
What you save every year
Profit Over 25 Years
£13,700
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 1032 kWh/kW — 19 above 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 1032 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)
1032 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: £864, Upfront: £10,173, 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 2065 kWh 826 kWh 1239 kWh £222 £124 £345 £4,069 11.8 yrs £2,840
3 kW 3097 kWh 1239 kWh 1858 kWh £332 £186 £518 £6,104 11.8 yrs £4,259
4 kW 4130 kWh 1652 kWh 2478 kWh £443 £248 £691 £8,138 11.8 yrs £5,679
5 kW 5162 kWh 2065 kWh 3097 kWh £554 £310 £864 £10,173 11.8 yrs £7,099
6 kW 6195 kWh 2478 kWh 3717 kWh £665 £372 £1,036 £12,207 11.8 yrs £8,519
7 kW 7227 kWh 2891 kWh 4336 kWh £775 £434 £1,209 £14,242 11.8 yrs £9,938
8 kW 8260 kWh 3304 kWh 4956 kWh £886 £496 £1,382 £16,276 11.8 yrs £11,358

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: £1,037, 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 2065 kWh 1239 kWh 826 kWh £332 £83 £415 £6,169 14.9 yrs £2,129
3 kW 3097 kWh 1858 kWh 1239 kWh £498 £124 £622 £8,204 13.2 yrs £4,243
4 kW 4130 kWh 2478 kWh 1652 kWh £665 £165 £830 £10,238 12.3 yrs £6,358
5 kW 5162 kWh 3097 kWh 2065 kWh £831 £206 £1,037 £12,273 11.8 yrs £8,472
6 kW 6195 kWh 3717 kWh 2478 kWh £997 £248 £1,245 £14,307 11.5 yrs £10,586
7 kW 7227 kWh 4336 kWh 2891 kWh £1,163 £289 £1,452 £16,342 11.3 yrs £12,701
8 kW 8260 kWh 4956 kWh 3304 kWh £1,329 £330 £1,660 £18,376 11.1 yrs £14,815

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: £1,124, Upfront: £13,673, 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 2065 kWh 1445 kWh 619 kWh £388 £62 £450 £7,569 16.8 yrs £1,423
3 kW 3097 kWh 2168 kWh 929 kWh £582 £93 £674 £9,604 14.2 yrs £3,885
4 kW 4130 kWh 2891 kWh 1239 kWh £775 £124 £899 £11,638 12.9 yrs £6,347
5 kW 5162 kWh 3614 kWh 1549 kWh £969 £155 £1,124 £13,673 12.2 yrs £8,809
6 kW 6195 kWh 4336 kWh 1858 kWh £1,163 £186 £1,349 £15,707 11.6 yrs £11,270
7 kW 7227 kWh 5059 kWh 2168 kWh £1,357 £217 £1,574 £17,742 11.3 yrs £13,732
8 kW 8260 kWh 5782 kWh 2478 kWh £1,551 £248 £1,798 £19,776 11.0 yrs £16,194

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: £1,150, 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 2065 kWh 1507 kWh 558 kWh £404 £56 £460 £9,319 20.3 yrs £-118
3 kW 3097 kWh 2261 kWh 836 kWh £606 £84 £690 £11,354 16.5 yrs £2,448
4 kW 4130 kWh 3015 kWh 1115 kWh £809 £112 £920 £13,388 14.6 yrs £5,014
5 kW 5162 kWh 3769 kWh 1394 kWh £1,011 £139 £1,150 £15,423 13.4 yrs £7,580
6 kW 6195 kWh 4522 kWh 1673 kWh £1,213 £167 £1,380 £17,457 12.6 yrs £10,146
7 kW 7227 kWh 5276 kWh 1951 kWh £1,415 £195 £1,610 £19,492 12.1 yrs £12,712
8 kW 8260 kWh 6030 kWh 2230 kWh £1,617 £223 £1,840 £21,526 11.7 yrs £15,277

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: £1,167, 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 2065 kWh 1549 kWh 516 kWh £415 £52 £467 £11,069 23.7 yrs £-1,729
3 kW 3097 kWh 2323 kWh 774 kWh £623 £77 £700 £13,104 18.7 yrs £906
4 kW 4130 kWh 3097 kWh 1032 kWh £831 £103 £934 £15,138 16.2 yrs £3,542
5 kW 5162 kWh 3872 kWh 1291 kWh £1,038 £129 £1,167 £17,173 14.7 yrs £6,177
6 kW 6195 kWh 4646 kWh 1549 kWh £1,246 £155 £1,401 £19,207 13.7 yrs £8,812
7 kW 7227 kWh 5421 kWh 1807 kWh £1,454 £181 £1,634 £21,242 13.0 yrs £11,448
8 kW 8260 kWh 6195 kWh 2065 kWh £1,661 £206 £1,868 £23,276 12.5 yrs £14,083

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: £1,185, Upfront: £19,623, Break-even: 16.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2065 kWh 1590 kWh 475 kWh £426 £47 £474 £13,519 28.5 yrs £-4,040
3 kW 3097 kWh 2385 kWh 712 kWh £640 £71 £711 £15,554 21.9 yrs £-1,335
4 kW 4130 kWh 3180 kWh 950 kWh £853 £95 £948 £17,588 18.6 yrs £1,369
5 kW 5162 kWh 3975 kWh 1187 kWh £1,066 £119 £1,185 £19,623 16.6 yrs £4,074
6 kW 6195 kWh 4770 kWh 1425 kWh £1,279 £142 £1,422 £21,657 15.2 yrs £6,779
7 kW 7227 kWh 5565 kWh 1662 kWh £1,493 £166 £1,659 £23,692 14.3 yrs £9,484
8 kW 8260 kWh 6360 kWh 1900 kWh £1,706 £190 £1,896 £25,726 13.6 yrs £12,189

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 TR6

Figures below are tailored to TR6 — click through for full league tables.

Big-Roof Britain Rank #513 of 2182
5.6 kWp (UK avg 5.1 kWp)
~12 panels (≈430 W)
Solar Payback Index Rank #302 of 2997
10.2 years (UK avg 11.3 years)
~£1,193 /yr • £12,207 upfront
Standing-Charge Drag Rank #642 of 2997
16.5% (UK avg 21.7%) drag on savings
£197 fixed • ~£1,193 /yr value

Your Area at a Glance

Your Electricity Rate
26.82p/kWh
Daily Fixed Charge
54.03p/day
Local Sunshine
1032kWh/kW
A 1 kW system generates ~1032 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: 56% • Flats: 25% • Bungalows: 17% Based on 1,542 properties

Coverage

Cornwall (100%)

Areas Covered

Perranporth, St Newlyn East, Cubert & Goonhavern

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

TR5 (Cornwall)
≈4.9 km away
Local sunshine: ~1,025 kWh/kWp · -1% vs TR6
TR4 (Cornwall)
≈7.1 km away
Local sunshine: ~1,005 kWh/kWp · -3% vs TR6
TR7 (Cornwall)
≈9.4 km away
Local sunshine: ~1,030 kWh/kWp · -0% vs TR6
TR8 (Cornwall)
≈10.2 km away
Local sunshine: ~1,023 kWh/kWp · -1% vs TR6
TR1 (Cornwall)
≈11.7 km away
Local sunshine: ~1,029 kWh/kWp · -0% vs TR6
TR16 (Cornwall)
≈12.7 km away
Local sunshine: ~1,013 kWh/kWp · -2% vs TR6

Similar sunshine across the UK

NR35 (East Suffolk)
~1,032 kWh/kWp · -0% vs TR6
SO15 (Southampton)
~1,032 kWh/kWp · -0% vs TR6
PE36 (King's Lynn and West Norfolk)
~1,032 kWh/kWp · -0% vs TR6