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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in KY13 (Perth and Kinross)

See if solar pays off for you in Perth and Kinross — 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
13.9 years
After this, it's pure profit
Upfront Cost
£10,173
What you pay to get started
Annual Benefit
£733
What you save every year
Profit Over 25 Years
£8,152
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 Northern Scotland, the current unit rate is 27.06p/kWh with a 61.00p/day standing charge. Your postcode’s south-facing sunshine yield is 871 kWh/kW — 56 above the regional median (815).

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 871 kWh per year on a south-facing roof. We value self-used electricity at 27.1p and exported surplus at a baseline 10p via SEG. Use the calculator above for your exact tariff.

Unit rate
27.1p/kWh
Standing charge
61.0p/day
Sunshine yield (south)
871 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: £733, Upfront: £10,173, Break-even: 13.9 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1743 kWh 697 kWh 1046 kWh £189 £105 £293 £4,069 13.9 yrs £1,795
3 kW 2614 kWh 1046 kWh 1568 kWh £283 £157 £440 £6,104 13.9 yrs £2,692
4 kW 3485 kWh 1394 kWh 2091 kWh £377 £209 £586 £8,138 13.9 yrs £3,589
5 kW 4357 kWh 1743 kWh 2614 kWh £472 £261 £733 £10,173 13.9 yrs £4,487
6 kW 5228 kWh 2091 kWh 3137 kWh £566 £314 £880 £12,207 13.9 yrs £5,384
7 kW 6099 kWh 2440 kWh 3660 kWh £660 £366 £1,026 £14,242 13.9 yrs £6,282
8 kW 6971 kWh 2788 kWh 4182 kWh £755 £418 £1,173 £16,276 13.9 yrs £7,179

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: £882, Upfront: £12,273, Break-even: 13.9 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1743 kWh 1046 kWh 697 kWh £283 £70 £353 £6,169 17.5 yrs £884
3 kW 2614 kWh 1568 kWh 1046 kWh £424 £105 £529 £8,204 15.5 yrs £2,376
4 kW 3485 kWh 2091 kWh 1394 kWh £566 £139 £705 £10,238 14.5 yrs £3,868
5 kW 4357 kWh 2614 kWh 1743 kWh £707 £174 £882 £12,273 13.9 yrs £5,360
6 kW 5228 kWh 3137 kWh 2091 kWh £849 £209 £1,058 £14,307 13.5 yrs £6,852
7 kW 6099 kWh 3660 kWh 2440 kWh £990 £244 £1,234 £16,342 13.2 yrs £8,344
8 kW 6971 kWh 4182 kWh 2788 kWh £1,132 £279 £1,411 £18,376 13.0 yrs £9,836

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: £956, Upfront: £13,673, 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 1743 kWh 1220 kWh 523 kWh £330 £52 £382 £7,569 19.8 yrs £79
3 kW 2614 kWh 1830 kWh 784 kWh £495 £78 £574 £9,604 16.7 yrs £1,868
4 kW 3485 kWh 2440 kWh 1046 kWh £660 £105 £765 £11,638 15.2 yrs £3,657
5 kW 4357 kWh 3050 kWh 1307 kWh £825 £131 £956 £13,673 14.3 yrs £5,446
6 kW 5228 kWh 3660 kWh 1568 kWh £990 £157 £1,147 £15,707 13.7 yrs £7,236
7 kW 6099 kWh 4270 kWh 1830 kWh £1,155 £183 £1,338 £17,742 13.3 yrs £9,025
8 kW 6971 kWh 4880 kWh 2091 kWh £1,320 £209 £1,530 £19,776 12.9 yrs £10,814

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: £978, Upfront: £15,423, 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 1743 kWh 1272 kWh 471 kWh £344 £47 £391 £9,319 23.8 yrs £-1,493
3 kW 2614 kWh 1908 kWh 706 kWh £516 £71 £587 £11,354 19.3 yrs £385
4 kW 3485 kWh 2544 kWh 941 kWh £688 £94 £783 £13,388 17.1 yrs £2,264
5 kW 4357 kWh 3180 kWh 1176 kWh £861 £118 £978 £15,423 15.8 yrs £4,142
6 kW 5228 kWh 3816 kWh 1412 kWh £1,033 £141 £1,174 £17,457 14.9 yrs £6,021
7 kW 6099 kWh 4453 kWh 1647 kWh £1,205 £165 £1,370 £19,492 14.2 yrs £7,899
8 kW 6971 kWh 5089 kWh 1882 kWh £1,377 £188 £1,565 £21,526 13.8 yrs £9,778

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: £993, Upfront: £17,173, Break-even: 17.3 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1743 kWh 1307 kWh 436 kWh £354 £44 £397 £11,069 27.9 yrs £-3,124
3 kW 2614 kWh 1961 kWh 654 kWh £531 £65 £596 £13,104 22.0 yrs £-1,186
4 kW 3485 kWh 2614 kWh 871 kWh £707 £87 £794 £15,138 19.1 yrs £752
5 kW 4357 kWh 3268 kWh 1089 kWh £884 £109 £993 £17,173 17.3 yrs £2,690
6 kW 5228 kWh 3921 kWh 1307 kWh £1,061 £131 £1,192 £19,207 16.1 yrs £4,628
7 kW 6099 kWh 4575 kWh 1525 kWh £1,238 £152 £1,390 £21,242 15.3 yrs £6,566
8 kW 6971 kWh 5228 kWh 1743 kWh £1,415 £174 £1,589 £23,276 14.6 yrs £8,503

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: £1,008, Upfront: £19,623, Break-even: 19.5 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1743 kWh 1342 kWh 401 kWh £363 £40 £403 £13,519 33.5 yrs £-5,455
3 kW 2614 kWh 2013 kWh 601 kWh £545 £60 £605 £15,554 25.7 yrs £-3,458
4 kW 3485 kWh 2684 kWh 802 kWh £726 £80 £806 £17,588 21.8 yrs £-1,460
5 kW 4357 kWh 3355 kWh 1002 kWh £908 £100 £1,008 £19,623 19.5 yrs £537
6 kW 5228 kWh 4026 kWh 1202 kWh £1,089 £120 £1,210 £21,657 17.9 yrs £2,534
7 kW 6099 kWh 4697 kWh 1403 kWh £1,271 £140 £1,411 £23,692 16.8 yrs £4,532
8 kW 6971 kWh 5367 kWh 1603 kWh £1,452 £160 £1,613 £25,726 16.0 yrs £6,529

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 KY13

Figures below are tailored to KY13 — click through for full league tables.

Solar Payback Index Rank #2306 of 2997
12.0 years (UK avg 11.3 years)
~£676 /yr • £8,138 upfront
Standing-Charge Drag Rank #2767 of 2997
32.9% (UK avg 21.7%) drag on savings
£223 fixed • ~£676 /yr value

Your Area at a Glance

Your Electricity Rate
27.06p/kWh
Daily Fixed Charge
61.00p/day
Local Sunshine
871kWh/kW
A 1 kW system generates ~871 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

No EPC data available for this outcode

Coverage

Perth and Kinross (99%)|Clackmannanshire (1%)|Fife (1%)

Areas Covered

Kinross-shire, Clackmannanshire East, Howe of Fife and Tay Coast, Cupar

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 Northern Scotland

PH2 (Perth and Kinross)
≈19.9 km away
Local sunshine: ~864 kWh/kWp · -1% vs KY13
PH3 (Perth and Kinross)
≈20.1 km away
Local sunshine: ~836 kWh/kWp · -4% vs KY13
PH1 (Perth and Kinross)
≈22.1 km away
Local sunshine: ~877 kWh/kWp · +1% vs KY13
PH4 (Perth and Kinross)
≈23.0 km away
Local sunshine: ~839 kWh/kWp · -4% vs KY13
PH5 (Perth and Kinross)
≈28.6 km away
Local sunshine: ~847 kWh/kWp · -3% vs KY13
PH14 (Perth and Kinross)
≈30.8 km away
Local sunshine: ~900 kWh/kWp · +3% vs KY13

Similar sunshine across the UK

BT37 (Antrim and Newtownabbey)
~871 kWh/kWp · -0% vs KY13
NE19 (Northumberland)
~871 kWh/kWp · -0% vs KY13
SK9 (Cheshire East)
~872 kWh/kWp · +0% vs KY13