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

Solar Panels in IV55 (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
15.5 years
After this, it's pure profit
Upfront Cost
£10,173
What you pay to get started
Annual Benefit
£656
What you save every year
Profit Over 25 Years
£6,218
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 779 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)
779 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: £656, Upfront: £10,173, Break-even: 15.5 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1559 kWh 624 kWh 935 kWh £169 £94 £262 £4,069 15.5 yrs £1,176
3 kW 2338 kWh 935 kWh 1403 kWh £253 £140 £393 £6,104 15.5 yrs £1,764
4 kW 3118 kWh 1247 kWh 1871 kWh £337 £187 £524 £8,138 15.5 yrs £2,352
5 kW 3897 kWh 1559 kWh 2338 kWh £422 £234 £656 £10,173 15.5 yrs £2,940
6 kW 4676 kWh 1871 kWh 2806 kWh £506 £281 £787 £12,207 15.5 yrs £3,528
7 kW 5456 kWh 2182 kWh 3273 kWh £591 £327 £918 £14,242 15.5 yrs £4,116
8 kW 6235 kWh 2494 kWh 3741 kWh £675 £374 £1,049 £16,276 15.5 yrs £4,704

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: £789, Upfront: £12,273, Break-even: 15.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1559 kWh 935 kWh 624 kWh £253 £62 £315 £6,169 19.6 yrs £140
3 kW 2338 kWh 1403 kWh 935 kWh £380 £94 £473 £8,204 17.3 yrs £1,260
4 kW 3118 kWh 1871 kWh 1247 kWh £506 £125 £631 £10,238 16.2 yrs £2,379
5 kW 3897 kWh 2338 kWh 1559 kWh £633 £156 £789 £12,273 15.6 yrs £3,499
6 kW 4676 kWh 2806 kWh 1871 kWh £759 £187 £946 £14,307 15.1 yrs £4,619
7 kW 5456 kWh 3273 kWh 2182 kWh £886 £218 £1,104 £16,342 14.8 yrs £5,739
8 kW 6235 kWh 3741 kWh 2494 kWh £1,012 £249 £1,262 £18,376 14.6 yrs £6,859

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: £855, Upfront: £13,673, Break-even: 16.0 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1559 kWh 1091 kWh 468 kWh £295 £47 £342 £7,569 22.1 yrs £-728
3 kW 2338 kWh 1637 kWh 701 kWh £443 £70 £513 £9,604 18.7 yrs £657
4 kW 3118 kWh 2182 kWh 935 kWh £591 £94 £684 £11,638 17.0 yrs £2,043
5 kW 3897 kWh 2728 kWh 1169 kWh £738 £117 £855 £13,673 16.0 yrs £3,429
6 kW 4676 kWh 3273 kWh 1403 kWh £886 £140 £1,026 £15,707 15.3 yrs £4,815
7 kW 5456 kWh 3819 kWh 1637 kWh £1,033 £164 £1,197 £17,742 14.8 yrs £6,200
8 kW 6235 kWh 4365 kWh 1871 kWh £1,181 £187 £1,368 £19,776 14.5 yrs £7,586

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: £875, Upfront: £15,423, 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 1559 kWh 1138 kWh 421 kWh £308 £42 £350 £9,319 26.6 yrs £-2,319
3 kW 2338 kWh 1707 kWh 631 kWh £462 £63 £525 £11,354 21.6 yrs £-853
4 kW 3118 kWh 2276 kWh 842 kWh £616 £84 £700 £13,388 19.1 yrs £612
5 kW 3897 kWh 2845 kWh 1052 kWh £770 £105 £875 £15,423 17.6 yrs £2,078
6 kW 4676 kWh 3414 kWh 1263 kWh £924 £126 £1,050 £17,457 16.6 yrs £3,543
7 kW 5456 kWh 3983 kWh 1473 kWh £1,078 £147 £1,225 £19,492 15.9 yrs £5,009
8 kW 6235 kWh 4552 kWh 1683 kWh £1,232 £168 £1,400 £21,526 15.4 yrs £6,474

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: £888, Upfront: £17,173, Break-even: 19.3 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1559 kWh 1169 kWh 390 kWh £316 £39 £355 £11,069 31.2 yrs £-3,963
3 kW 2338 kWh 1754 kWh 585 kWh £475 £58 £533 £13,104 24.6 yrs £-2,444
4 kW 3118 kWh 2338 kWh 779 kWh £633 £78 £711 £15,138 21.3 yrs £-925
5 kW 3897 kWh 2923 kWh 974 kWh £791 £97 £888 £17,173 19.3 yrs £594
6 kW 4676 kWh 3507 kWh 1169 kWh £949 £117 £1,066 £19,207 18.0 yrs £2,112
7 kW 5456 kWh 4092 kWh 1364 kWh £1,107 £136 £1,244 £21,242 17.1 yrs £3,631
8 kW 6235 kWh 4676 kWh 1559 kWh £1,265 £156 £1,421 £23,276 16.4 yrs £5,150

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: £902, Upfront: £19,623, Break-even: 21.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1559 kWh 1200 kWh 359 kWh £325 £36 £361 £13,519 37.5 yrs £-6,306
3 kW 2338 kWh 1800 kWh 538 kWh £487 £54 £541 £15,554 28.8 yrs £-4,734
4 kW 3118 kWh 2401 kWh 717 kWh £650 £72 £721 £17,588 24.4 yrs £-3,162
5 kW 3897 kWh 3001 kWh 896 kWh £812 £90 £902 £19,623 21.8 yrs £-1,590
6 kW 4676 kWh 3601 kWh 1076 kWh £974 £108 £1,082 £21,657 20.0 yrs £-19
7 kW 5456 kWh 4201 kWh 1255 kWh £1,137 £125 £1,262 £23,692 18.8 yrs £1,553
8 kW 6235 kWh 4801 kWh 1434 kWh £1,299 £143 £1,443 £25,726 17.8 yrs £3,125

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
779kWh/kW
A 1 kW system generates ~779 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.