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

Solar Panels in PH17 (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
16.1 years
After this, it's pure profit
Upfront Cost
£10,173
What you pay to get started
Annual Benefit
£632
What you save every year
Profit Over 25 Years
£5,629
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 751 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)
751 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: £632, Upfront: £10,173, Break-even: 16.1 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1503 kWh 601 kWh 902 kWh £163 £90 £253 £4,069 16.1 yrs £987
3 kW 2254 kWh 902 kWh 1352 kWh £244 £135 £379 £6,104 16.1 yrs £1,481
4 kW 3005 kWh 1202 kWh 1803 kWh £325 £180 £506 £8,138 16.1 yrs £1,975
5 kW 3757 kWh 1503 kWh 2254 kWh £407 £225 £632 £10,173 16.1 yrs £2,468
6 kW 4508 kWh 1803 kWh 2705 kWh £488 £270 £758 £12,207 16.1 yrs £2,962
7 kW 5260 kWh 2104 kWh 3156 kWh £569 £316 £885 £14,242 16.1 yrs £3,456
8 kW 6011 kWh 2404 kWh 3607 kWh £651 £361 £1,011 £16,276 16.1 yrs £3,949

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: £760, Upfront: £12,273, Break-even: 16.1 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1503 kWh 902 kWh 601 kWh £244 £60 £304 £6,169 20.3 yrs £-87
3 kW 2254 kWh 1352 kWh 902 kWh £366 £90 £456 £8,204 18.0 yrs £919
4 kW 3005 kWh 1803 kWh 1202 kWh £488 £120 £608 £10,238 16.8 yrs £1,926
5 kW 3757 kWh 2254 kWh 1503 kWh £610 £150 £760 £12,273 16.1 yrs £2,932
6 kW 4508 kWh 2705 kWh 1803 kWh £732 £180 £912 £14,307 15.7 yrs £3,938
7 kW 5260 kWh 3156 kWh 2104 kWh £854 £210 £1,064 £16,342 15.4 yrs £4,945
8 kW 6011 kWh 3607 kWh 2404 kWh £976 £240 £1,216 £18,376 15.1 yrs £5,951

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: £824, Upfront: £13,673, Break-even: 16.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1503 kWh 1052 kWh 451 kWh £285 £45 £330 £7,569 23.0 yrs £-974
3 kW 2254 kWh 1578 kWh 676 kWh £427 £68 £495 £9,604 19.4 yrs £288
4 kW 3005 kWh 2104 kWh 902 kWh £569 £90 £659 £11,638 17.6 yrs £1,551
5 kW 3757 kWh 2630 kWh 1127 kWh £712 £113 £824 £13,673 16.6 yrs £2,814
6 kW 4508 kWh 3156 kWh 1352 kWh £854 £135 £989 £15,707 15.9 yrs £4,077
7 kW 5260 kWh 3682 kWh 1578 kWh £996 £158 £1,154 £17,742 15.4 yrs £5,339
8 kW 6011 kWh 4208 kWh 1803 kWh £1,139 £180 £1,319 £19,776 15.0 yrs £6,602

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: £844, Upfront: £15,423, Break-even: 18.3 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1503 kWh 1097 kWh 406 kWh £297 £41 £337 £9,319 27.6 yrs £-2,571
3 kW 2254 kWh 1645 kWh 609 kWh £445 £61 £506 £11,354 22.4 yrs £-1,231
4 kW 3005 kWh 2194 kWh 811 kWh £594 £81 £675 £13,388 19.8 yrs £109
5 kW 3757 kWh 2742 kWh 1014 kWh £742 £101 £844 £15,423 18.3 yrs £1,448
6 kW 4508 kWh 3291 kWh 1217 kWh £891 £122 £1,012 £17,457 17.2 yrs £2,788
7 kW 5260 kWh 3839 kWh 1420 kWh £1,039 £142 £1,181 £19,492 16.5 yrs £4,128
8 kW 6011 kWh 4388 kWh 1623 kWh £1,187 £162 £1,350 £21,526 15.9 yrs £5,467

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: £856, Upfront: £17,173, Break-even: 20.1 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1503 kWh 1127 kWh 376 kWh £305 £38 £343 £11,069 32.3 yrs £-4,218
3 kW 2254 kWh 1691 kWh 564 kWh £457 £56 £514 £13,104 25.5 yrs £-2,827
4 kW 3005 kWh 2254 kWh 751 kWh £610 £75 £685 £15,138 22.1 yrs £-1,436
5 kW 3757 kWh 2818 kWh 939 kWh £762 £94 £856 £17,173 20.1 yrs £-45
6 kW 4508 kWh 3381 kWh 1127 kWh £915 £113 £1,028 £19,207 18.7 yrs £1,346
7 kW 5260 kWh 3945 kWh 1315 kWh £1,067 £131 £1,199 £21,242 17.7 yrs £2,737
8 kW 6011 kWh 4508 kWh 1503 kWh £1,220 £150 £1,370 £23,276 17.0 yrs £4,128

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: £869, Upfront: £19,623, Break-even: 22.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1503 kWh 1157 kWh 346 kWh £313 £35 £348 £13,519 38.9 yrs £-6,566
3 kW 2254 kWh 1736 kWh 518 kWh £470 £52 £522 £15,554 29.8 yrs £-5,123
4 kW 3005 kWh 2314 kWh 691 kWh £626 £69 £695 £17,588 25.3 yrs £-3,681
5 kW 3757 kWh 2893 kWh 864 kWh £783 £86 £869 £19,623 22.6 yrs £-2,239
6 kW 4508 kWh 3471 kWh 1037 kWh £939 £104 £1,043 £21,657 20.8 yrs £-797
7 kW 5260 kWh 4050 kWh 1210 kWh £1,096 £121 £1,217 £23,692 19.5 yrs £645
8 kW 6011 kWh 4628 kWh 1383 kWh £1,252 £138 £1,391 £25,726 18.5 yrs £2,088

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
751kWh/kW
A 1 kW system generates ~751 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

Highland

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.