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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in PH10 (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
13.6 years
After this, it's pure profit
Upfront Cost
£10,173
What you pay to get started
Annual Benefit
£747
What you save every year
Profit Over 25 Years
£8,501
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 888 kWh/kW — 73 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 888 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)
888 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: £747, Upfront: £10,173, Break-even: 13.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1776 kWh 710 kWh 1066 kWh £192 £107 £299 £4,069 13.6 yrs £1,907
3 kW 2664 kWh 1066 kWh 1598 kWh £288 £160 £448 £6,104 13.6 yrs £2,860
4 kW 3552 kWh 1421 kWh 2131 kWh £384 £213 £598 £8,138 13.6 yrs £3,813
5 kW 4440 kWh 1776 kWh 2664 kWh £481 £266 £747 £10,173 13.6 yrs £4,766
6 kW 5328 kWh 2131 kWh 3197 kWh £577 £320 £896 £12,207 13.6 yrs £5,720
7 kW 6216 kWh 2486 kWh 3729 kWh £673 £373 £1,046 £14,242 13.6 yrs £6,673
8 kW 7104 kWh 2841 kWh 4262 kWh £769 £426 £1,195 £16,276 13.6 yrs £7,626

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: £898, Upfront: £12,273, Break-even: 13.7 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1776 kWh 1066 kWh 710 kWh £288 £71 £359 £6,169 17.2 yrs £1,018
3 kW 2664 kWh 1598 kWh 1066 kWh £433 £107 £539 £8,204 15.2 yrs £2,578
4 kW 3552 kWh 2131 kWh 1421 kWh £577 £142 £719 £10,238 14.2 yrs £4,137
5 kW 4440 kWh 2664 kWh 1776 kWh £721 £178 £898 £12,273 13.7 yrs £5,696
6 kW 5328 kWh 3197 kWh 2131 kWh £865 £213 £1,078 £14,307 13.3 yrs £7,255
7 kW 6216 kWh 3729 kWh 2486 kWh £1,009 £249 £1,258 £16,342 13.0 yrs £8,814
8 kW 7104 kWh 4262 kWh 2841 kWh £1,153 £284 £1,437 £18,376 12.8 yrs £10,374

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: £974, Upfront: £13,673, 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 1776 kWh 1243 kWh 533 kWh £336 £53 £390 £7,569 19.4 yrs £224
3 kW 2664 kWh 1865 kWh 799 kWh £505 £80 £585 £9,604 16.4 yrs £2,087
4 kW 3552 kWh 2486 kWh 1066 kWh £673 £107 £779 £11,638 14.9 yrs £3,949
5 kW 4440 kWh 3108 kWh 1332 kWh £841 £133 £974 £13,673 14.0 yrs £5,811
6 kW 5328 kWh 3729 kWh 1598 kWh £1,009 £160 £1,169 £15,707 13.4 yrs £7,673
7 kW 6216 kWh 4351 kWh 1865 kWh £1,177 £186 £1,364 £17,742 13.0 yrs £9,535
8 kW 7104 kWh 4973 kWh 2131 kWh £1,346 £213 £1,559 £19,776 12.7 yrs £11,397

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: £997, Upfront: £15,423, Break-even: 15.5 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1776 kWh 1296 kWh 479 kWh £351 £48 £399 £9,319 23.4 yrs £-1,344
3 kW 2664 kWh 1945 kWh 719 kWh £526 £72 £598 £11,354 19.0 yrs £609
4 kW 3552 kWh 2593 kWh 959 kWh £702 £96 £798 £13,388 16.8 yrs £2,562
5 kW 4440 kWh 3241 kWh 1199 kWh £877 £120 £997 £15,423 15.5 yrs £4,515
6 kW 5328 kWh 3889 kWh 1438 kWh £1,052 £144 £1,196 £17,457 14.6 yrs £6,468
7 kW 6216 kWh 4537 kWh 1678 kWh £1,228 £168 £1,396 £19,492 14.0 yrs £8,421
8 kW 7104 kWh 5186 kWh 1918 kWh £1,403 £192 £1,595 £21,526 13.5 yrs £10,374

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: £1,012, Upfront: £17,173, Break-even: 17.0 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1776 kWh 1332 kWh 444 kWh £360 £44 £405 £11,069 27.3 yrs £-2,973
3 kW 2664 kWh 1998 kWh 666 kWh £541 £67 £607 £13,104 21.6 yrs £-959
4 kW 3552 kWh 2664 kWh 888 kWh £721 £89 £810 £15,138 18.7 yrs £1,055
5 kW 4440 kWh 3330 kWh 1110 kWh £901 £111 £1,012 £17,173 17.0 yrs £3,068
6 kW 5328 kWh 3996 kWh 1332 kWh £1,081 £133 £1,214 £19,207 15.8 yrs £5,082
7 kW 6216 kWh 4662 kWh 1554 kWh £1,261 £155 £1,417 £21,242 15.0 yrs £7,096
8 kW 7104 kWh 5328 kWh 1776 kWh £1,442 £178 £1,619 £23,276 14.4 yrs £9,109

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: £1,027, Upfront: £19,623, Break-even: 19.1 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1776 kWh 1367 kWh 408 kWh £370 £41 £411 £13,519 32.9 yrs £-5,302
3 kW 2664 kWh 2051 kWh 613 kWh £555 £61 £616 £15,554 25.2 yrs £-3,227
4 kW 3552 kWh 2735 kWh 817 kWh £740 £82 £822 £17,588 21.4 yrs £-1,153
5 kW 4440 kWh 3419 kWh 1021 kWh £925 £102 £1,027 £19,623 19.1 yrs £921
6 kW 5328 kWh 4102 kWh 1225 kWh £1,110 £123 £1,233 £21,657 17.6 yrs £2,995
7 kW 6216 kWh 4786 kWh 1430 kWh £1,295 £143 £1,438 £23,692 16.5 yrs £5,070
8 kW 7104 kWh 5470 kWh 1634 kWh £1,480 £163 £1,644 £25,726 15.7 yrs £7,144

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 PH10

Figures below are tailored to PH10 — click through for full league tables.

Solar Payback Index Rank #2135 of 2997
11.8 years (UK avg 11.3 years)
~£688 /yr • £8,138 upfront
Standing-Charge Drag Rank #2749 of 2997
32.4% (UK avg 21.7%) drag on savings
£223 fixed • ~£688 /yr value

Your Area at a Glance

Your Electricity Rate
27.06p/kWh
Daily Fixed Charge
61.00p/day
Local Sunshine
888kWh/kW
A 1 kW system generates ~888 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

Blairgowrie and Glens, Strathtay, Strathmore

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

PH13 (Perth and Kinross)
≈6.5 km away
Local sunshine: ~886 kWh/kWp · -0% vs PH10
PH11 (Perth and Kinross)
≈7.6 km away
Local sunshine: ~888 kWh/kWp · +0% vs PH10
PH12 (Perth and Kinross)
≈11.3 km away
Local sunshine: ~892 kWh/kWp · +0% vs PH10
PH8 (Perth and Kinross)
≈15.1 km away
Local sunshine: ~830 kWh/kWp · -7% vs PH10
PH14 (Perth and Kinross)
≈19.1 km away
Local sunshine: ~900 kWh/kWp · +1% vs PH10
PH1 (Perth and Kinross)
≈22.0 km away
Local sunshine: ~877 kWh/kWp · -1% vs PH10

Similar sunshine across the UK

SY18 (Powys)
~888 kWh/kWp · -0% vs PH10
HX4 (Calderdale)
~888 kWh/kWp · -0% vs PH10
SA39 (Carmarthenshire)
~888 kWh/kWp · +0% vs PH10