Solar explained to clever people by people who are not trying to be clever

Solar Panels in PH5 (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
14.3 years
After this, it's pure profit
Upfront Cost
£10,173
What you pay to get started
Annual Benefit
£713
What you save every year
Profit Over 25 Years
£7,641
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

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 847 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)
847 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: £713, Upfront: £10,173, 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 1694 kWh 678 kWh 1016 kWh £183 £102 £285 £4,069 14.3 yrs £1,631
3 kW 2541 kWh 1016 kWh 1525 kWh £275 £152 £428 £6,104 14.3 yrs £2,447
4 kW 3388 kWh 1355 kWh 2033 kWh £367 £203 £570 £8,138 14.3 yrs £3,263
5 kW 4235 kWh 1694 kWh 2541 kWh £458 £254 £713 £10,173 14.3 yrs £4,078
6 kW 5082 kWh 2033 kWh 3049 kWh £550 £305 £855 £12,207 14.3 yrs £4,894
7 kW 5929 kWh 2372 kWh 3558 kWh £642 £356 £998 £14,242 14.3 yrs £5,710
8 kW 6776 kWh 2711 kWh 4066 kWh £733 £407 £1,140 £16,276 14.3 yrs £6,525

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: £857, Upfront: £12,273, 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 1694 kWh 1016 kWh 678 kWh £275 £68 £343 £6,169 18.0 yrs £687
3 kW 2541 kWh 1525 kWh 1016 kWh £413 £102 £514 £8,204 16.0 yrs £2,081
4 kW 3388 kWh 2033 kWh 1355 kWh £550 £136 £686 £10,238 14.9 yrs £3,475
5 kW 4235 kWh 2541 kWh 1694 kWh £688 £169 £857 £12,273 14.3 yrs £4,869
6 kW 5082 kWh 3049 kWh 2033 kWh £825 £203 £1,028 £14,307 13.9 yrs £6,262
7 kW 5929 kWh 3558 kWh 2372 kWh £963 £237 £1,200 £16,342 13.6 yrs £7,656
8 kW 6776 kWh 4066 kWh 2711 kWh £1,100 £271 £1,371 £18,376 13.4 yrs £9,050

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: £929, Upfront: £13,673, Break-even: 14.7 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1694 kWh 1186 kWh 508 kWh £321 £51 £372 £7,569 20.4 yrs £-135
3 kW 2541 kWh 1779 kWh 762 kWh £481 £76 £558 £9,604 17.2 yrs £1,548
4 kW 3388 kWh 2372 kWh 1016 kWh £642 £102 £743 £11,638 15.7 yrs £3,231
5 kW 4235 kWh 2965 kWh 1271 kWh £802 £127 £929 £13,673 14.7 yrs £4,914
6 kW 5082 kWh 3558 kWh 1525 kWh £963 £152 £1,115 £15,707 14.1 yrs £6,596
7 kW 5929 kWh 4151 kWh 1779 kWh £1,123 £178 £1,301 £17,742 13.6 yrs £8,279
8 kW 6776 kWh 4744 kWh 2033 kWh £1,284 £203 £1,487 £19,776 13.3 yrs £9,962

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: £951, Upfront: £15,423, Break-even: 16.2 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1694 kWh 1237 kWh 457 kWh £335 £46 £380 £9,319 24.5 yrs £-1,711
3 kW 2541 kWh 1855 kWh 686 kWh £502 £69 £571 £11,354 19.9 yrs £58
4 kW 3388 kWh 2473 kWh 915 kWh £669 £91 £761 £13,388 17.6 yrs £1,828
5 kW 4235 kWh 3092 kWh 1144 kWh £837 £114 £951 £15,423 16.2 yrs £3,597
6 kW 5082 kWh 3710 kWh 1372 kWh £1,004 £137 £1,141 £17,457 15.3 yrs £5,367
7 kW 5929 kWh 4328 kWh 1601 kWh £1,171 £160 £1,331 £19,492 14.6 yrs £7,136
8 kW 6776 kWh 4947 kWh 1830 kWh £1,339 £183 £1,522 £21,526 14.1 yrs £8,905

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: £965, Upfront: £17,173, Break-even: 17.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1694 kWh 1271 kWh 424 kWh £344 £42 £386 £11,069 28.7 yrs £-3,346
3 kW 2541 kWh 1906 kWh 635 kWh £516 £64 £579 £13,104 22.6 yrs £-1,518
4 kW 3388 kWh 2541 kWh 847 kWh £688 £85 £772 £15,138 19.6 yrs £309
5 kW 4235 kWh 3176 kWh 1059 kWh £860 £106 £965 £17,173 17.8 yrs £2,136
6 kW 5082 kWh 3812 kWh 1271 kWh £1,031 £127 £1,159 £19,207 16.6 yrs £3,963
7 kW 5929 kWh 4447 kWh 1482 kWh £1,203 £148 £1,352 £21,242 15.7 yrs £5,791
8 kW 6776 kWh 5082 kWh 1694 kWh £1,375 £169 £1,545 £23,276 15.1 yrs £7,618

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: £980, Upfront: £19,623, Break-even: 20.0 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1694 kWh 1304 kWh 390 kWh £353 £39 £392 £13,519 34.5 yrs £-5,680
3 kW 2541 kWh 1957 kWh 584 kWh £529 £58 £588 £15,554 26.5 yrs £-3,795
4 kW 3388 kWh 2609 kWh 779 kWh £706 £78 £784 £17,588 22.4 yrs £-1,910
5 kW 4235 kWh 3261 kWh 974 kWh £882 £97 £980 £19,623 20.0 yrs £-25
6 kW 5082 kWh 3913 kWh 1169 kWh £1,059 £117 £1,176 £21,657 18.4 yrs £1,860
7 kW 5929 kWh 4566 kWh 1364 kWh £1,235 £136 £1,372 £23,692 17.3 yrs £3,745
8 kW 6776 kWh 5218 kWh 1559 kWh £1,412 £156 £1,568 £25,726 16.4 yrs £5,630

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.

Your Area at a Glance

Your Electricity Rate
27.06p/kWh
Daily Fixed Charge
61.00p/day
Local Sunshine
847kWh/kW
A 1 kW system generates ~847 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, Strathearn

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.