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

Solar Panels in PH35 (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
£578
What you save every year
Profit Over 25 Years
£4,278
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 687 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)
687 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: £578, 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 1374 kWh 550 kWh 825 kWh £149 £82 £231 £4,069 17.6 yrs £555
3 kW 2061 kWh 825 kWh 1237 kWh £223 £124 £347 £6,104 17.6 yrs £833
4 kW 2749 kWh 1099 kWh 1649 kWh £298 £165 £462 £8,138 17.6 yrs £1,110
5 kW 3436 kWh 1374 kWh 2061 kWh £372 £206 £578 £10,173 17.6 yrs £1,388
6 kW 4123 kWh 1649 kWh 2474 kWh £446 £247 £694 £12,207 17.6 yrs £1,666
7 kW 4810 kWh 1924 kWh 2886 kWh £521 £289 £809 £14,242 17.6 yrs £1,943
8 kW 5497 kWh 2199 kWh 3298 kWh £595 £330 £925 £16,276 17.6 yrs £2,221

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: £695, Upfront: £12,273, Break-even: 17.7 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1374 kWh 825 kWh 550 kWh £223 £55 £278 £6,169 22.2 yrs £-607
3 kW 2061 kWh 1237 kWh 825 kWh £335 £82 £417 £8,204 19.7 yrs £140
4 kW 2749 kWh 1649 kWh 1099 kWh £446 £110 £556 £10,238 18.4 yrs £886
5 kW 3436 kWh 2061 kWh 1374 kWh £558 £137 £695 £12,273 17.7 yrs £1,633
6 kW 4123 kWh 2474 kWh 1649 kWh £669 £165 £834 £14,307 17.1 yrs £2,379
7 kW 4810 kWh 2886 kWh 1924 kWh £781 £192 £973 £16,342 16.8 yrs £3,126
8 kW 5497 kWh 3298 kWh 2199 kWh £893 £220 £1,112 £18,376 16.5 yrs £3,872

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: £754, 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 1374 kWh 962 kWh 412 kWh £260 £41 £302 £7,569 25.1 yrs £-1,538
3 kW 2061 kWh 1443 kWh 618 kWh £390 £62 £452 £9,604 21.2 yrs £-557
4 kW 2749 kWh 1924 kWh 825 kWh £521 £82 £603 £11,638 19.3 yrs £424
5 kW 3436 kWh 2405 kWh 1031 kWh £651 £103 £754 £13,673 18.1 yrs £1,405
6 kW 4123 kWh 2886 kWh 1237 kWh £781 £124 £905 £15,707 17.4 yrs £2,386
7 kW 4810 kWh 3367 kWh 1443 kWh £911 £144 £1,055 £17,742 16.8 yrs £3,367
8 kW 5497 kWh 3848 kWh 1649 kWh £1,041 £165 £1,206 £19,776 16.4 yrs £4,348

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: £771, 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 1374 kWh 1003 kWh 371 kWh £271 £37 £309 £9,319 30.2 yrs £-3,147
3 kW 2061 kWh 1505 kWh 557 kWh £407 £56 £463 £11,354 24.5 yrs £-2,096
4 kW 2749 kWh 2006 kWh 742 kWh £543 £74 £617 £13,388 21.7 yrs £-1,045
5 kW 3436 kWh 2508 kWh 928 kWh £679 £93 £771 £15,423 20.0 yrs £7
6 kW 4123 kWh 3010 kWh 1113 kWh £814 £111 £926 £17,457 18.9 yrs £1,058
7 kW 4810 kWh 3511 kWh 1299 kWh £950 £130 £1,080 £19,492 18.0 yrs £2,109
8 kW 5497 kWh 4013 kWh 1484 kWh £1,086 £148 £1,234 £21,526 17.4 yrs £3,161

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: £783, 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 1374 kWh 1031 kWh 344 kWh £279 £34 £313 £11,069 35.3 yrs £-4,804
3 kW 2061 kWh 1546 kWh 515 kWh £418 £52 £470 £13,104 27.9 yrs £-3,705
4 kW 2749 kWh 2061 kWh 687 kWh £558 £69 £627 £15,138 24.2 yrs £-2,607
5 kW 3436 kWh 2577 kWh 859 kWh £697 £86 £783 £17,173 21.9 yrs £-1,509
6 kW 4123 kWh 3092 kWh 1031 kWh £837 £103 £940 £19,207 20.4 yrs £-411
7 kW 4810 kWh 3608 kWh 1203 kWh £976 £120 £1,096 £21,242 19.4 yrs £687
8 kW 5497 kWh 4123 kWh 1374 kWh £1,116 £137 £1,253 £23,276 18.6 yrs £1,786

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: £795, Upfront: £19,623, Break-even: 24.7 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1374 kWh 1058 kWh 316 kWh £286 £32 £318 £13,519 42.5 yrs £-7,160
3 kW 2061 kWh 1587 kWh 474 kWh £430 £47 £477 £15,554 32.6 yrs £-6,015
4 kW 2749 kWh 2116 kWh 632 kWh £573 £63 £636 £17,588 27.7 yrs £-4,870
5 kW 3436 kWh 2646 kWh 790 kWh £716 £79 £795 £19,623 24.7 yrs £-3,725
6 kW 4123 kWh 3175 kWh 948 kWh £859 £95 £954 £21,657 22.7 yrs £-2,579
7 kW 4810 kWh 3704 kWh 1106 kWh £1,002 £111 £1,113 £23,692 21.3 yrs £-1,434
8 kW 5497 kWh 4233 kWh 1264 kWh £1,145 £126 £1,272 £25,726 20.2 yrs £-289

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
687kWh/kW
A 1 kW system generates ~687 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

Caol and Mallaig, 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.