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

Solar Panels in IV48 (Highland)

See if solar pays off for you in Highland — 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
16.3 years
After this, it's pure profit
Upfront Cost
£10,173
What you pay to get started
Annual Benefit
£623
What you save every year
Profit Over 25 Years
£5,404
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 741 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)
741 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: £623, Upfront: £10,173, Break-even: 16.3 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1481 kWh 593 kWh 889 kWh £160 £89 £249 £4,069 16.3 yrs £915
3 kW 2222 kWh 889 kWh 1333 kWh £241 £133 £374 £6,104 16.3 yrs £1,373
4 kW 2963 kWh 1185 kWh 1778 kWh £321 £178 £498 £8,138 16.3 yrs £1,831
5 kW 3703 kWh 1481 kWh 2222 kWh £401 £222 £623 £10,173 16.3 yrs £2,289
6 kW 4444 kWh 1778 kWh 2666 kWh £481 £267 £748 £12,207 16.3 yrs £2,746
7 kW 5185 kWh 2074 kWh 3111 kWh £561 £311 £872 £14,242 16.3 yrs £3,204
8 kW 5925 kWh 2370 kWh 3555 kWh £641 £356 £997 £16,276 16.3 yrs £3,662

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: £749, Upfront: £12,273, 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 1481 kWh 889 kWh 593 kWh £241 £59 £300 £6,169 20.6 yrs £-174
3 kW 2222 kWh 1333 kWh 889 kWh £361 £89 £450 £8,204 18.2 yrs £790
4 kW 2963 kWh 1778 kWh 1185 kWh £481 £119 £600 £10,238 17.1 yrs £1,753
5 kW 3703 kWh 2222 kWh 1481 kWh £601 £148 £749 £12,273 16.4 yrs £2,716
6 kW 4444 kWh 2666 kWh 1778 kWh £722 £178 £899 £14,307 15.9 yrs £3,679
7 kW 5185 kWh 3111 kWh 2074 kWh £842 £207 £1,049 £16,342 15.6 yrs £4,642
8 kW 5925 kWh 3555 kWh 2370 kWh £962 £237 £1,199 £18,376 15.3 yrs £5,605

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: £813, Upfront: £13,673, Break-even: 16.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1481 kWh 1037 kWh 444 kWh £281 £44 £325 £7,569 23.3 yrs £-1,068
3 kW 2222 kWh 1555 kWh 667 kWh £421 £67 £488 £9,604 19.7 yrs £148
4 kW 2963 kWh 2074 kWh 889 kWh £561 £89 £650 £11,638 17.9 yrs £1,364
5 kW 3703 kWh 2592 kWh 1111 kWh £701 £111 £813 £13,673 16.8 yrs £2,579
6 kW 4444 kWh 3111 kWh 1333 kWh £842 £133 £975 £15,707 16.1 yrs £3,795
7 kW 5185 kWh 3629 kWh 1555 kWh £982 £156 £1,138 £17,742 15.6 yrs £5,011
8 kW 5925 kWh 4148 kWh 1778 kWh £1,122 £178 £1,300 £19,776 15.2 yrs £6,227

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: £832, Upfront: £15,423, Break-even: 18.5 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1481 kWh 1081 kWh 400 kWh £293 £40 £333 £9,319 28.0 yrs £-2,667
3 kW 2222 kWh 1622 kWh 600 kWh £439 £60 £499 £11,354 22.8 yrs £-1,375
4 kW 2963 kWh 2163 kWh 800 kWh £585 £80 £665 £13,388 20.1 yrs £-83
5 kW 3703 kWh 2703 kWh 1000 kWh £732 £100 £832 £15,423 18.5 yrs £1,209
6 kW 4444 kWh 3244 kWh 1200 kWh £878 £120 £998 £17,457 17.5 yrs £2,500
7 kW 5185 kWh 3785 kWh 1400 kWh £1,024 £140 £1,164 £19,492 16.7 yrs £3,792
8 kW 5925 kWh 4326 kWh 1600 kWh £1,170 £160 £1,330 £21,526 16.2 yrs £5,084

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: £844, Upfront: £17,173, Break-even: 20.3 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1481 kWh 1111 kWh 370 kWh £301 £37 £338 £11,069 32.8 yrs £-4,315
3 kW 2222 kWh 1667 kWh 556 kWh £451 £56 £507 £13,104 25.9 yrs £-2,973
4 kW 2963 kWh 2222 kWh 741 kWh £601 £74 £675 £15,138 22.4 yrs £-1,631
5 kW 3703 kWh 2778 kWh 926 kWh £752 £93 £844 £17,173 20.3 yrs £-289
6 kW 4444 kWh 3333 kWh 1111 kWh £902 £111 £1,013 £19,207 19.0 yrs £1,054
7 kW 5185 kWh 3889 kWh 1296 kWh £1,052 £130 £1,182 £21,242 18.0 yrs £2,396
8 kW 5925 kWh 4444 kWh 1481 kWh £1,203 £148 £1,351 £23,276 17.2 yrs £3,738

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: £857, Upfront: £19,623, Break-even: 22.9 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1481 kWh 1141 kWh 341 kWh £309 £34 £343 £13,519 39.4 yrs £-6,664
3 kW 2222 kWh 1711 kWh 511 kWh £463 £51 £514 £15,554 30.3 yrs £-5,272
4 kW 2963 kWh 2281 kWh 681 kWh £617 £68 £685 £17,588 25.7 yrs £-3,879
5 kW 3703 kWh 2852 kWh 852 kWh £772 £85 £857 £19,623 22.9 yrs £-2,486
6 kW 4444 kWh 3422 kWh 1022 kWh £926 £102 £1,028 £21,657 21.1 yrs £-1,093
7 kW 5185 kWh 3992 kWh 1192 kWh £1,080 £119 £1,200 £23,692 19.8 yrs £300
8 kW 5925 kWh 4563 kWh 1363 kWh £1,235 £136 £1,371 £25,726 18.8 yrs £1,692

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
741kWh/kW
A 1 kW system generates ~741 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

Highland (100%)

Areas Covered

Eilean á Chèo

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.