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

Solar Panels in IV54 (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
17.6 years
After this, it's pure profit
Upfront Cost
£10,173
What you pay to get started
Annual Benefit
£579
What you save every year
Profit Over 25 Years
£4,308
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 689 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)
689 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: £579, Upfront: £10,173, Break-even: 17.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1377 kWh 551 kWh 826 kWh £149 £83 £232 £4,069 17.6 yrs £565
3 kW 2066 kWh 826 kWh 1239 kWh £224 £124 £348 £6,104 17.6 yrs £847
4 kW 2754 kWh 1102 kWh 1653 kWh £298 £165 £463 £8,138 17.6 yrs £1,129
5 kW 3443 kWh 1377 kWh 2066 kWh £373 £207 £579 £10,173 17.6 yrs £1,412
6 kW 4131 kWh 1653 kWh 2479 kWh £447 £248 £695 £12,207 17.6 yrs £1,694
7 kW 4820 kWh 1928 kWh 2892 kWh £522 £289 £811 £14,242 17.6 yrs £1,976
8 kW 5508 kWh 2203 kWh 3305 kWh £596 £331 £927 £16,276 17.6 yrs £2,259

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: £697, Upfront: £12,273, Break-even: 17.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1377 kWh 826 kWh 551 kWh £224 £55 £279 £6,169 22.1 yrs £-596
3 kW 2066 kWh 1239 kWh 826 kWh £335 £83 £418 £8,204 19.6 yrs £157
4 kW 2754 kWh 1653 kWh 1102 kWh £447 £110 £557 £10,238 18.4 yrs £909
5 kW 3443 kWh 2066 kWh 1377 kWh £559 £138 £697 £12,273 17.6 yrs £1,661
6 kW 4131 kWh 2479 kWh 1653 kWh £671 £165 £836 £14,307 17.1 yrs £2,413
7 kW 4820 kWh 2892 kWh 1928 kWh £783 £193 £975 £16,342 16.8 yrs £3,165
8 kW 5508 kWh 3305 kWh 2203 kWh £894 £220 £1,115 £18,376 16.5 yrs £3,918

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: £755, Upfront: £13,673, Break-even: 18.1 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1377 kWh 964 kWh 413 kWh £261 £41 £302 £7,569 25.0 yrs £-1,526
3 kW 2066 kWh 1446 kWh 620 kWh £391 £62 £453 £9,604 21.2 yrs £-539
4 kW 2754 kWh 1928 kWh 826 kWh £522 £83 £604 £11,638 19.3 yrs £448
5 kW 3443 kWh 2410 kWh 1033 kWh £652 £103 £755 £13,673 18.1 yrs £1,436
6 kW 4131 kWh 2892 kWh 1239 kWh £783 £124 £906 £15,707 17.3 yrs £2,423
7 kW 4820 kWh 3374 kWh 1446 kWh £913 £145 £1,058 £17,742 16.8 yrs £3,410
8 kW 5508 kWh 3856 kWh 1653 kWh £1,043 £165 £1,209 £19,776 16.4 yrs £4,397

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: £773, Upfront: £15,423, 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 1377 kWh 1005 kWh 372 kWh £272 £37 £309 £9,319 30.1 yrs £-3,135
3 kW 2066 kWh 1508 kWh 558 kWh £408 £56 £464 £11,354 24.5 yrs £-2,077
4 kW 2754 kWh 2011 kWh 744 kWh £544 £74 £618 £13,388 21.6 yrs £-1,020
5 kW 3443 kWh 2513 kWh 930 kWh £680 £93 £773 £15,423 20.0 yrs £38
6 kW 4131 kWh 3016 kWh 1115 kWh £816 £112 £928 £17,457 18.8 yrs £1,096
7 kW 4820 kWh 3518 kWh 1301 kWh £952 £130 £1,082 £19,492 18.0 yrs £2,153
8 kW 5508 kWh 4021 kWh 1487 kWh £1,088 £149 £1,237 £21,526 17.4 yrs £3,211

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: £785, Upfront: £17,173, Break-even: 21.9 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1377 kWh 1033 kWh 344 kWh £279 £34 £314 £11,069 35.3 yrs £-4,791
3 kW 2066 kWh 1549 kWh 516 kWh £419 £52 £471 £13,104 27.8 yrs £-3,686
4 kW 2754 kWh 2066 kWh 689 kWh £559 £69 £628 £15,138 24.1 yrs £-2,582
5 kW 3443 kWh 2582 kWh 861 kWh £699 £86 £785 £17,173 21.9 yrs £-1,477
6 kW 4131 kWh 3098 kWh 1033 kWh £838 £103 £942 £19,207 20.4 yrs £-372
7 kW 4820 kWh 3615 kWh 1205 kWh £978 £120 £1,099 £21,242 19.3 yrs £732
8 kW 5508 kWh 4131 kWh 1377 kWh £1,118 £138 £1,256 £23,276 18.5 yrs £1,837

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: £797, Upfront: £19,623, Break-even: 24.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1377 kWh 1060 kWh 317 kWh £287 £32 £319 £13,519 42.4 yrs £-7,147
3 kW 2066 kWh 1591 kWh 475 kWh £430 £48 £478 £15,554 32.5 yrs £-5,995
4 kW 2754 kWh 2121 kWh 633 kWh £574 £63 £637 £17,588 27.6 yrs £-4,844
5 kW 3443 kWh 2651 kWh 792 kWh £717 £79 £797 £19,623 24.6 yrs £-3,692
6 kW 4131 kWh 3181 kWh 950 kWh £861 £95 £956 £21,657 22.7 yrs £-2,541
7 kW 4820 kWh 3711 kWh 1109 kWh £1,004 £111 £1,115 £23,692 21.2 yrs £-1,389
8 kW 5508 kWh 4241 kWh 1267 kWh £1,148 £127 £1,274 £25,726 20.2 yrs £-237

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
689kWh/kW
A 1 kW system generates ~689 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

Wester Ross, Strathpeffer and Lochalsh

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.