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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in PH2 (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
14.0 years
After this, it's pure profit
Upfront Cost
£6,104
What you pay to get started
Annual Benefit
£436
What you save every year
Profit Over 25 Years
£4,800
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 864 kWh/kW — 49 above the regional median (815).

Read the full story

A typical roof here lands around 3.0 kW, with most eligible homes comfortably fitting within 3–6 kW. Each kilowatt of panels produces roughly 864 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)
864 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: £727, Upfront: £10,173, 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 1728 kWh 691 kWh 1037 kWh £187 £104 £291 £4,069 14.0 yrs £1,746
3 kW 2592 kWh 1037 kWh 1555 kWh £281 £156 £436 £6,104 14.0 yrs £2,619
4 kW 3456 kWh 1383 kWh 2074 kWh £374 £207 £582 £8,138 14.0 yrs £3,492
5 kW 4321 kWh 1728 kWh 2592 kWh £468 £259 £727 £10,173 14.0 yrs £4,365
6 kW 5185 kWh 2074 kWh 3111 kWh £561 £311 £872 £12,207 14.0 yrs £5,238
7 kW 6049 kWh 2420 kWh 3629 kWh £655 £363 £1,018 £14,242 14.0 yrs £6,111
8 kW 6913 kWh 2765 kWh 4148 kWh £748 £415 £1,163 £16,276 14.0 yrs £6,984

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: £874, Upfront: £12,273, 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 1728 kWh 1037 kWh 691 kWh £281 £69 £350 £6,169 17.6 yrs £825
3 kW 2592 kWh 1555 kWh 1037 kWh £421 £104 £525 £8,204 15.6 yrs £2,288
4 kW 3456 kWh 2074 kWh 1383 kWh £561 £138 £699 £10,238 14.6 yrs £3,751
5 kW 4321 kWh 2592 kWh 1728 kWh £701 £173 £874 £12,273 14.0 yrs £5,214
6 kW 5185 kWh 3111 kWh 2074 kWh £842 £207 £1,049 £14,307 13.6 yrs £6,676
7 kW 6049 kWh 3629 kWh 2420 kWh £982 £242 £1,224 £16,342 13.4 yrs £8,139
8 kW 6913 kWh 4148 kWh 2765 kWh £1,122 £277 £1,399 £18,376 13.1 yrs £9,602

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: £948, Upfront: £13,673, 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 1728 kWh 1210 kWh 518 kWh £327 £52 £379 £7,569 20.0 yrs £15
3 kW 2592 kWh 1815 kWh 778 kWh £491 £78 £569 £9,604 16.9 yrs £1,773
4 kW 3456 kWh 2420 kWh 1037 kWh £655 £104 £758 £11,638 15.3 yrs £3,530
5 kW 4321 kWh 3024 kWh 1296 kWh £818 £130 £948 £13,673 14.4 yrs £5,288
6 kW 5185 kWh 3629 kWh 1555 kWh £982 £156 £1,138 £15,707 13.8 yrs £7,045
7 kW 6049 kWh 4234 kWh 1815 kWh £1,146 £181 £1,327 £17,742 13.4 yrs £8,803
8 kW 6913 kWh 4839 kWh 2074 kWh £1,309 £207 £1,517 £19,776 13.0 yrs £10,560

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: £970, Upfront: £15,423, Break-even: 15.9 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1728 kWh 1262 kWh 467 kWh £341 £47 £388 £9,319 24.0 yrs £-1,558
3 kW 2592 kWh 1892 kWh 700 kWh £512 £70 £582 £11,354 19.5 yrs £288
4 kW 3456 kWh 2523 kWh 933 kWh £683 £93 £776 £13,388 17.3 yrs £2,134
5 kW 4321 kWh 3154 kWh 1167 kWh £853 £117 £970 £15,423 15.9 yrs £3,980
6 kW 5185 kWh 3785 kWh 1400 kWh £1,024 £140 £1,164 £17,457 15.0 yrs £5,826
7 kW 6049 kWh 4416 kWh 1633 kWh £1,195 £163 £1,358 £19,492 14.4 yrs £7,672
8 kW 6913 kWh 5046 kWh 1866 kWh £1,366 £187 £1,552 £21,526 13.9 yrs £9,518

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: £985, Upfront: £17,173, Break-even: 17.4 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1728 kWh 1296 kWh 432 kWh £351 £43 £394 £11,069 28.1 yrs £-3,190
3 kW 2592 kWh 1944 kWh 648 kWh £526 £65 £591 £13,104 22.2 yrs £-1,285
4 kW 3456 kWh 2592 kWh 864 kWh £701 £86 £788 £15,138 19.2 yrs £620
5 kW 4321 kWh 3240 kWh 1080 kWh £877 £108 £985 £17,173 17.4 yrs £2,525
6 kW 5185 kWh 3888 kWh 1296 kWh £1,052 £130 £1,182 £19,207 16.3 yrs £4,430
7 kW 6049 kWh 4537 kWh 1512 kWh £1,228 £151 £1,379 £21,242 15.4 yrs £6,335
8 kW 6913 kWh 5185 kWh 1728 kWh £1,403 £173 £1,576 £23,276 14.8 yrs £8,240

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: £1,000, Upfront: £19,623, Break-even: 19.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1728 kWh 1331 kWh 397 kWh £360 £40 £400 £13,519 33.8 yrs £-5,522
3 kW 2592 kWh 1996 kWh 596 kWh £540 £60 £600 £15,554 25.9 yrs £-3,558
4 kW 3456 kWh 2661 kWh 795 kWh £720 £79 £800 £17,588 22.0 yrs £-1,594
5 kW 4321 kWh 3327 kWh 994 kWh £900 £99 £1,000 £19,623 19.6 yrs £370
6 kW 5185 kWh 3992 kWh 1192 kWh £1,080 £119 £1,200 £21,657 18.1 yrs £2,334
7 kW 6049 kWh 4658 kWh 1391 kWh £1,260 £139 £1,399 £23,692 16.9 yrs £4,298
8 kW 6913 kWh 5323 kWh 1590 kWh £1,440 £159 £1,599 £25,726 16.1 yrs £6,261

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 PH2

Figures below are tailored to PH2 — click through for full league tables.

Solar Payback Index Rank #2433 of 2997
12.1 years (UK avg 11.3 years)
~£670 /yr • £8,138 upfront
Standing-Charge Drag Rank #2780 of 2997
33.2% (UK avg 21.7%) drag on savings
£223 fixed • ~£670 /yr value

Your Area at a Glance

Your Electricity Rate
27.06p/kWh
Daily Fixed Charge
61.00p/day
Local Sunshine
864kWh/kW
A 1 kW system generates ~864 kWh per year. A typical home uses ~2,700 kWh per year.
Typical System Size
3.0kW
For houses & bungalows in this area

⚠️ This area is predominantly flats. Many residents require freeholder approval for solar installations. System size shown reflects houses and bungalows only.

Local Property Data

Property Types

No EPC data available for this outcode

Coverage

Perth and Kinross (100%)

Areas Covered

Perth City South, Perth City Centre, Strathmore, Almond and Earn, Carse of Gowrie, Strathallan, Kinross-shire, Strathtay + 1 more

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

PH1 (Perth and Kinross)
≈3.0 km away
Local sunshine: ~877 kWh/kWp · +1% vs PH2
PH14 (Perth and Kinross)
≈17.1 km away
Local sunshine: ~900 kWh/kWp · +4% vs PH2
KY13 (Perth and Kinross)
≈19.9 km away
Local sunshine: ~871 kWh/kWp · +1% vs PH2
PH13 (Perth and Kinross)
≈20.0 km away
Local sunshine: ~886 kWh/kWp · +3% vs PH2
PH3 (Perth and Kinross)
≈20.0 km away
Local sunshine: ~836 kWh/kWp · -3% vs PH2
PH8 (Perth and Kinross)
≈21.4 km away
Local sunshine: ~830 kWh/kWp · -4% vs PH2

Similar sunshine across the UK

LL42 (Gwynedd)
~864 kWh/kWp · -0% vs PH2
BB0 (Blackburn with Darwen)
~864 kWh/kWp · +0% vs PH2
BT69 (Mid Ulster)
~863 kWh/kWp · -0% vs PH2