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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in PH4 (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).

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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
14.4 years
After this, it's pure profit
Upfront Cost
£10,173
What you pay to get started
Annual Benefit
£706
What you save every year
Profit Over 25 Years
£7,472
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 839 kWh/kW — 24 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 839 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)
839 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: £706, Upfront: £10,173, Break-even: 14.4 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1678 kWh 671 kWh 1007 kWh £182 £101 £282 £4,069 14.4 yrs £1,577
3 kW 2517 kWh 1007 kWh 1510 kWh £272 £151 £423 £6,104 14.4 yrs £2,366
4 kW 3356 kWh 1342 kWh 2014 kWh £363 £201 £565 £8,138 14.4 yrs £3,155
5 kW 4195 kWh 1678 kWh 2517 kWh £454 £252 £706 £10,173 14.4 yrs £3,943
6 kW 5034 kWh 2014 kWh 3021 kWh £545 £302 £847 £12,207 14.4 yrs £4,732
7 kW 5873 kWh 2349 kWh 3524 kWh £636 £352 £988 £14,242 14.4 yrs £5,521
8 kW 6712 kWh 2685 kWh 4027 kWh £727 £403 £1,129 £16,276 14.4 yrs £6,309

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: £849, Upfront: £12,273, Break-even: 14.5 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1678 kWh 1007 kWh 671 kWh £272 £67 £340 £6,169 18.2 yrs £622
3 kW 2517 kWh 1510 kWh 1007 kWh £409 £101 £509 £8,204 16.1 yrs £1,984
4 kW 3356 kWh 2014 kWh 1342 kWh £545 £134 £679 £10,238 15.1 yrs £3,345
5 kW 4195 kWh 2517 kWh 1678 kWh £681 £168 £849 £12,273 14.5 yrs £4,706
6 kW 5034 kWh 3021 kWh 2014 kWh £817 £201 £1,019 £14,307 14.0 yrs £6,067
7 kW 5873 kWh 3524 kWh 2349 kWh £954 £235 £1,189 £16,342 13.7 yrs £7,428
8 kW 6712 kWh 4027 kWh 2685 kWh £1,090 £268 £1,358 £18,376 13.5 yrs £8,790

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: £920, Upfront: £13,673, 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 1678 kWh 1175 kWh 503 kWh £318 £50 £368 £7,569 20.6 yrs £-205
3 kW 2517 kWh 1762 kWh 755 kWh £477 £76 £552 £9,604 17.4 yrs £1,442
4 kW 3356 kWh 2349 kWh 1007 kWh £636 £101 £736 £11,638 15.8 yrs £3,090
5 kW 4195 kWh 2937 kWh 1259 kWh £795 £126 £920 £13,673 14.9 yrs £4,737
6 kW 5034 kWh 3524 kWh 1510 kWh £954 £151 £1,105 £15,707 14.2 yrs £6,385
7 kW 5873 kWh 4111 kWh 1762 kWh £1,113 £176 £1,289 £17,742 13.8 yrs £8,032
8 kW 6712 kWh 4699 kWh 2014 kWh £1,271 £201 £1,473 £19,776 13.4 yrs £9,680

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: £942, Upfront: £15,423, Break-even: 16.4 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1678 kWh 1225 kWh 453 kWh £331 £45 £377 £9,319 24.7 yrs £-1,783
3 kW 2517 kWh 1837 kWh 680 kWh £497 £68 £565 £11,354 20.1 yrs £-50
4 kW 3356 kWh 2450 kWh 906 kWh £663 £91 £754 £13,388 17.8 yrs £1,683
5 kW 4195 kWh 3062 kWh 1133 kWh £829 £113 £942 £15,423 16.4 yrs £3,417
6 kW 5034 kWh 3675 kWh 1359 kWh £994 £136 £1,130 £17,457 15.4 yrs £5,150
7 kW 5873 kWh 4287 kWh 1586 kWh £1,160 £159 £1,319 £19,492 14.8 yrs £6,884
8 kW 6712 kWh 4900 kWh 1812 kWh £1,326 £181 £1,507 £21,526 14.3 yrs £8,617

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: £956, Upfront: £17,173, Break-even: 18.0 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1678 kWh 1259 kWh 420 kWh £341 £42 £383 £11,069 28.9 yrs £-3,419
3 kW 2517 kWh 1888 kWh 629 kWh £511 £63 £574 £13,104 22.8 yrs £-1,628
4 kW 3356 kWh 2517 kWh 839 kWh £681 £84 £765 £15,138 19.8 yrs £163
5 kW 4195 kWh 3146 kWh 1049 kWh £851 £105 £956 £17,173 18.0 yrs £1,953
6 kW 5034 kWh 3776 kWh 1259 kWh £1,022 £126 £1,148 £19,207 16.7 yrs £3,744
7 kW 5873 kWh 4405 kWh 1468 kWh £1,192 £147 £1,339 £21,242 15.9 yrs £5,534
8 kW 6712 kWh 5034 kWh 1678 kWh £1,362 £168 £1,530 £23,276 15.2 yrs £7,325

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: £971, Upfront: £19,623, Break-even: 20.2 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1678 kWh 1292 kWh 386 kWh £350 £39 £388 £13,519 34.8 yrs £-5,754
3 kW 2517 kWh 1938 kWh 579 kWh £524 £58 £582 £15,554 26.7 yrs £-3,906
4 kW 3356 kWh 2584 kWh 772 kWh £699 £77 £776 £17,588 22.7 yrs £-2,058
5 kW 4195 kWh 3230 kWh 965 kWh £874 £96 £971 £19,623 20.2 yrs £-211
6 kW 5034 kWh 3876 kWh 1158 kWh £1,049 £116 £1,165 £21,657 18.6 yrs £1,637
7 kW 5873 kWh 4522 kWh 1351 kWh £1,224 £135 £1,359 £23,692 17.4 yrs £3,485
8 kW 6712 kWh 5168 kWh 1544 kWh £1,399 £154 £1,553 £25,726 16.6 yrs £5,333

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 PH4

Figures below are tailored to PH4 — click through for full league tables.

Solar Payback Index Rank #2655 of 2997
12.5 years (UK avg 11.3 years)
~£651 /yr • £8,138 upfront
Standing-Charge Drag Rank #2804 of 2997
34.2% (UK avg 21.7%) drag on savings
£223 fixed • ~£651 /yr value

Your Area at a Glance

Your Electricity Rate
27.06p/kWh
Daily Fixed Charge
61.00p/day
Local Sunshine
839kWh/kW
A 1 kW system generates ~839 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 (100%)

Areas Covered

Strathallan

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

PH3 (Perth and Kinross)
≈6.2 km away
Local sunshine: ~836 kWh/kWp · -0% vs PH4
PH5 (Perth and Kinross)
≈8.2 km away
Local sunshine: ~847 kWh/kWp · +1% vs PH4
PH7 (Perth and Kinross)
≈12.9 km away
Local sunshine: ~856 kWh/kWp · +2% vs PH4
FK15 (Stirling)
≈13.7 km away
Local sunshine: ~848 kWh/kWp · +1% vs PH4
PH6 (Perth and Kinross)
≈17.6 km away
Local sunshine: ~824 kWh/kWp · -2% vs PH4
FK16 (Stirling)
≈18.7 km away
Local sunshine: ~861 kWh/kWp · +3% vs PH4

Similar sunshine across the UK

SK10 (Cheshire East)
~839 kWh/kWp · -0% vs PH4
G78 (East Renfrewshire)
~839 kWh/kWp · +0% vs PH4
OL13 (Rossendale)
~838 kWh/kWp · -0% vs PH4