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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in TR19 (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
11.2 years
After this, it's pure profit
Upfront Cost
£10,173
What you pay to get started
Annual Benefit
£906
What you save every year
Profit Over 25 Years
£12,473
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 1083 kWh/kW — 70 above the regional median (1013).

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 1083 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)
1083 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: £906, Upfront: £10,173, Break-even: 11.2 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2166 kWh 866 kWh 1300 kWh £232 £130 £362 £4,069 11.2 yrs £3,178
3 kW 3249 kWh 1300 kWh 1949 kWh £349 £195 £544 £6,104 11.2 yrs £4,767
4 kW 4332 kWh 1733 kWh 2599 kWh £465 £260 £725 £8,138 11.2 yrs £6,355
5 kW 5415 kWh 2166 kWh 3249 kWh £581 £325 £906 £10,173 11.2 yrs £7,944
6 kW 6498 kWh 2599 kWh 3899 kWh £697 £390 £1,087 £12,207 11.2 yrs £9,533
7 kW 7581 kWh 3032 kWh 4549 kWh £813 £455 £1,268 £14,242 11.2 yrs £11,122
8 kW 8664 kWh 3466 kWh 5198 kWh £929 £520 £1,449 £16,276 11.2 yrs £12,711

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: £1,088, Upfront: £12,273, Break-even: 11.3 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2166 kWh 1300 kWh 866 kWh £349 £87 £435 £6,169 14.2 yrs £2,535
3 kW 3249 kWh 1949 kWh 1300 kWh £523 £130 £653 £8,204 12.6 yrs £4,852
4 kW 4332 kWh 2599 kWh 1733 kWh £697 £173 £870 £10,238 11.8 yrs £7,170
5 kW 5415 kWh 3249 kWh 2166 kWh £871 £217 £1,088 £12,273 11.3 yrs £9,487
6 kW 6498 kWh 3899 kWh 2599 kWh £1,046 £260 £1,306 £14,307 11.0 yrs £11,805
7 kW 7581 kWh 4549 kWh 3032 kWh £1,220 £303 £1,523 £16,342 10.7 yrs £14,122
8 kW 8664 kWh 5198 kWh 3466 kWh £1,394 £347 £1,741 £18,376 10.6 yrs £16,440

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: £1,179, Upfront: £13,673, Break-even: 11.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2166 kWh 1516 kWh 650 kWh £407 £65 £472 £7,569 16.0 yrs £1,864
3 kW 3249 kWh 2274 kWh 975 kWh £610 £97 £707 £9,604 13.6 yrs £4,545
4 kW 4332 kWh 3032 kWh 1300 kWh £813 £130 £943 £11,638 12.3 yrs £7,227
5 kW 5415 kWh 3791 kWh 1625 kWh £1,017 £162 £1,179 £13,673 11.6 yrs £9,909
6 kW 6498 kWh 4549 kWh 1949 kWh £1,220 £195 £1,415 £15,707 11.1 yrs £12,591
7 kW 7581 kWh 5307 kWh 2274 kWh £1,423 £227 £1,651 £17,742 10.7 yrs £15,273
8 kW 8664 kWh 6065 kWh 2599 kWh £1,627 £260 £1,887 £19,776 10.5 yrs £17,955

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: £1,206, Upfront: £15,423, Break-even: 12.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2166 kWh 1581 kWh 585 kWh £424 £58 £483 £9,319 19.3 yrs £332
3 kW 3249 kWh 2372 kWh 877 kWh £636 £88 £724 £11,354 15.7 yrs £3,123
4 kW 4332 kWh 3162 kWh 1170 kWh £848 £117 £965 £13,388 13.9 yrs £5,914
5 kW 5415 kWh 3953 kWh 1462 kWh £1,060 £146 £1,206 £15,423 12.8 yrs £8,706
6 kW 6498 kWh 4744 kWh 1754 kWh £1,272 £175 £1,448 £17,457 12.1 yrs £11,497
7 kW 7581 kWh 5534 kWh 2047 kWh £1,484 £205 £1,689 £19,492 11.5 yrs £14,288
8 kW 8664 kWh 6325 kWh 2339 kWh £1,696 £234 £1,930 £21,526 11.2 yrs £17,079

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: £1,225, Upfront: £17,173, Break-even: 14.0 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2166 kWh 1625 kWh 542 kWh £436 £54 £490 £11,069 22.6 yrs £-1,272
3 kW 3249 kWh 2437 kWh 812 kWh £654 £81 £735 £13,104 17.8 yrs £1,592
4 kW 4332 kWh 3249 kWh 1083 kWh £871 £108 £980 £15,138 15.5 yrs £4,456
5 kW 5415 kWh 4061 kWh 1354 kWh £1,089 £135 £1,225 £17,173 14.0 yrs £7,320
6 kW 6498 kWh 4874 kWh 1625 kWh £1,307 £162 £1,470 £19,207 13.1 yrs £10,184
7 kW 7581 kWh 5686 kWh 1895 kWh £1,525 £190 £1,714 £21,242 12.4 yrs £13,048
8 kW 8664 kWh 6498 kWh 2166 kWh £1,743 £217 £1,959 £23,276 11.9 yrs £15,912

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: £1,243, Upfront: £19,623, Break-even: 15.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2166 kWh 1668 kWh 498 kWh £447 £50 £497 £13,519 27.2 yrs £-3,576
3 kW 3249 kWh 2502 kWh 747 kWh £671 £75 £746 £15,554 20.9 yrs £-639
4 kW 4332 kWh 3336 kWh 996 kWh £895 £100 £994 £17,588 17.7 yrs £2,297
5 kW 5415 kWh 4170 kWh 1245 kWh £1,118 £125 £1,243 £19,623 15.8 yrs £5,234
6 kW 6498 kWh 5004 kWh 1495 kWh £1,342 £149 £1,491 £21,657 14.5 yrs £8,171
7 kW 7581 kWh 5837 kWh 1744 kWh £1,566 £174 £1,740 £23,692 13.6 yrs £11,108
8 kW 8664 kWh 6671 kWh 1993 kWh £1,789 £199 £1,989 £25,726 12.9 yrs £14,045

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 TR19

Figures below are tailored to TR19 — click through for full league tables.

Big-Roof Britain Rank #811 of 2182
5.2 kWp (UK avg 5.1 kWp)
~11 panels (≈430 W)
Solar Payback Index Rank #143 of 2997
9.8 years (UK avg 11.3 years)
~£1,042 /yr • £10,173 upfront
Standing-Charge Drag Rank #1229 of 2997
18.9% (UK avg 21.7%) drag on savings
£197 fixed • ~£1,042 /yr value

Your Area at a Glance

Your Electricity Rate
26.82p/kWh
Daily Fixed Charge
54.03p/day
Local Sunshine
1083kWh/kW
A 1 kW system generates ~1083 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: 70% • Flats: 9% • Bungalows: 19% Based on 3,659 properties

Coverage

Cornwall (100%)

Areas Covered

Land's End, Mousehole, Newlyn & St Buryan, Penzance East, Ludgvan, Madron, Gulval & Heamoor

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

TR18 (Cornwall)
≈8.8 km away
Local sunshine: ~1,066 kWh/kWp · -2% vs TR19
TR93 (Cornwall)
≈11.7 km away
Local sunshine: ~1,066 kWh/kWp · -2% vs TR19
TR20 (Cornwall)
≈12.2 km away
Local sunshine: ~1,067 kWh/kWp · -1% vs TR19
TR17 (Cornwall)
≈13.8 km away
Local sunshine: ~1,067 kWh/kWp · -1% vs TR19
TR26 (Cornwall)
≈17.5 km away
Local sunshine: ~1,009 kWh/kWp · -7% vs TR19
TR27 (Cornwall)
≈20.1 km away
Local sunshine: ~1,067 kWh/kWp · -1% vs TR19

Similar sunshine across the UK

SS5 (Rochford)
~1,083 kWh/kWp · -0% vs TR19
BN5 (Horsham)
~1,083 kWh/kWp · -0% vs TR19
PO4 (Portsmouth)
~1,084 kWh/kWp · +0% vs TR19