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Solar panel cost in Na h-Eileanan Siar (HS4)

See realistic solar installation costs, savings and payback for HS4 (Na h-Eileanan Siar) in under a minute using official UK data. Start with the calculator, then get a no-obligation quote from an MCS-certified installer. You can also ask the SolarByPostcode assistant to sanity-check your roof, bills and plans.

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
12.4 years
After this, it's pure profit
Upfront Cost
£8,139
What you pay to get started
Annual Benefit
£655
What you save every year
Profit Over 25 Years
£8,248
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: The official cost per kW is lower above 4 kW, so a 5–6 kW system can pay back a little faster than a 3–4 kW system on otherwise identical assumptions.
  • 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

Panel costs: Uses March 2026 TIC mean installation costs: £1,827/kW up to 4 kW and £1,628/kW above 4 kW.

Other costs: Battery prices are modelled at £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

In Northern Scotland, the current unit rate is 26.42p/kWh with a 57.55p/day standing charge. Your postcode’s south-facing sunshine yield is 791 kWh/kW — 24 below the regional median (815).

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 791 kWh per year on a south-facing roof. We value self-used electricity at 26.4p and exported surplus at a baseline 10p via SEG. Use the calculator above for your exact tariff.

Unit rate
26.4p/kWh
Standing charge
57.5p/day
Sunshine yield (south)
791 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: £655, Upfront: £8,139, Break-even: 12.4 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1582 kWh 633 kWh 949 kWh £167 £95 £262 £3,256 12.4 yrs £1,988
3 kW 2374 kWh 949 kWh 1424 kWh £251 £142 £393 £4,883 12.4 yrs £2,982
4 kW 3165 kWh 1266 kWh 1899 kWh £334 £190 £524 £6,511 12.4 yrs £3,976
5 kW 3956 kWh 1582 kWh 2374 kWh £418 £237 £655 £8,139 12.4 yrs £4,970
6 kW 4747 kWh 1899 kWh 2848 kWh £502 £285 £787 £9,767 12.4 yrs £5,965
7 kW 5539 kWh 2215 kWh 3323 kWh £585 £332 £918 £11,394 12.4 yrs £6,959
8 kW 6330 kWh 2532 kWh 3798 kWh £669 £380 £1,049 £13,022 12.4 yrs £7,953

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,628, battery £/kWh = 700.

3 kWh battery 5 kW example → Annual benefit: £785, Upfront: £10,239, Break-even: 13.0 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1582 kWh 949 kWh 633 kWh £251 £63 £314 £5,356 17.0 yrs £928
3 kW 2374 kWh 1424 kWh 949 kWh £376 £95 £471 £6,983 14.8 yrs £2,441
4 kW 3165 kWh 1899 kWh 1266 kWh £502 £127 £628 £8,611 13.7 yrs £3,955
5 kW 3956 kWh 2374 kWh 1582 kWh £627 £158 £785 £10,239 13.0 yrs £5,469
6 kW 4747 kWh 2848 kWh 1899 kWh £753 £190 £942 £11,867 12.6 yrs £6,983
7 kW 5539 kWh 3323 kWh 2215 kWh £878 £222 £1,100 £13,494 12.3 yrs £8,496
8 kW 6330 kWh 3798 kWh 2532 kWh £1,003 £253 £1,257 £15,122 12.0 yrs £10,010

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,628, battery £/kWh = 700.

5 kWh battery 5 kW example → Annual benefit: £850, Upfront: £11,639, Break-even: 13.7 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1582 kWh 1108 kWh 475 kWh £293 £47 £340 £6,756 19.9 yrs £47
3 kW 2374 kWh 1662 kWh 712 kWh £439 £71 £510 £8,383 16.4 yrs £1,821
4 kW 3165 kWh 2215 kWh 949 kWh £585 £95 £680 £10,011 14.7 yrs £3,594
5 kW 3956 kWh 2769 kWh 1187 kWh £732 £119 £850 £11,639 13.7 yrs £5,368
6 kW 4747 kWh 3323 kWh 1424 kWh £878 £142 £1,020 £13,267 13.0 yrs £7,142
7 kW 5539 kWh 3877 kWh 1662 kWh £1,024 £166 £1,190 £14,894 12.5 yrs £8,915
8 kW 6330 kWh 4431 kWh 1899 kWh £1,171 £190 £1,361 £16,522 12.1 yrs £10,689

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,628, battery £/kWh = 700.

7.5 kWh battery 5 kW example → Annual benefit: £870, Upfront: £13,389, Break-even: 15.4 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1582 kWh 1155 kWh 427 kWh £305 £43 £348 £8,506 24.4 yrs £-1,547
3 kW 2374 kWh 1733 kWh 641 kWh £458 £64 £522 £10,133 19.4 yrs £305
4 kW 3165 kWh 2310 kWh 855 kWh £610 £85 £696 £11,761 16.9 yrs £2,156
5 kW 3956 kWh 2888 kWh 1068 kWh £763 £107 £870 £13,389 15.4 yrs £4,008
6 kW 4747 kWh 3466 kWh 1282 kWh £916 £128 £1,044 £15,017 14.4 yrs £5,859
7 kW 5539 kWh 4043 kWh 1495 kWh £1,068 £150 £1,218 £16,644 13.7 yrs £7,711
8 kW 6330 kWh 4621 kWh 1709 kWh £1,221 £171 £1,392 £18,272 13.1 yrs £9,563

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,628, battery £/kWh = 700.

10 kWh battery 5 kW example → Annual benefit: £883, Upfront: £15,139, Break-even: 17.1 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1582 kWh 1187 kWh 396 kWh £314 £40 £353 £10,256 29.0 yrs £-3,193
3 kW 2374 kWh 1780 kWh 593 kWh £470 £59 £530 £11,883 22.4 yrs £-1,289
4 kW 3165 kWh 2374 kWh 791 kWh £627 £79 £706 £13,511 19.1 yrs £614
5 kW 3956 kWh 2967 kWh 989 kWh £784 £99 £883 £15,139 17.1 yrs £2,518
6 kW 4747 kWh 3561 kWh 1187 kWh £941 £119 £1,059 £16,767 15.8 yrs £4,421
7 kW 5539 kWh 4154 kWh 1385 kWh £1,097 £138 £1,236 £18,394 14.9 yrs £6,325
8 kW 6330 kWh 4747 kWh 1582 kWh £1,254 £158 £1,413 £20,022 14.2 yrs £8,228

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,628, battery £/kWh = 700.

13.5 kWh battery 5 kW example → Annual benefit: £896, Upfront: £17,589, Break-even: 19.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1582 kWh 1219 kWh 364 kWh £322 £36 £358 £12,706 35.5 yrs £-5,539
3 kW 2374 kWh 1828 kWh 546 kWh £483 £55 £537 £14,333 26.7 yrs £-3,583
4 kW 3165 kWh 2437 kWh 728 kWh £644 £73 £717 £15,961 22.3 yrs £-1,628
5 kW 3956 kWh 3046 kWh 910 kWh £805 £91 £896 £17,589 19.6 yrs £328
6 kW 4747 kWh 3656 kWh 1092 kWh £966 £109 £1,075 £19,217 17.9 yrs £2,283
7 kW 5539 kWh 4265 kWh 1274 kWh £1,127 £127 £1,254 £20,844 16.6 yrs £4,239
8 kW 6330 kWh 4874 kWh 1456 kWh £1,288 £146 £1,433 £22,472 15.7 yrs £6,194

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,628, 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.

Before you request quotes in Na h-Eileanan Siar

Use the numbers above to sanity-check installer quotes. The main things to compare are system size, battery assumptions, payback claims, MCS certification, DNO paperwork and export assumptions.

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Understand DNO, G98 and G99 export limits

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Insights for HS4

Figures below are tailored to HS4 — click through for full league tables.

Solar Payback Index Rank #2900 of 2996
13.9 years (UK avg 10.8 years)
~£524 /yr • £7,307 upfront
Standing-Charge Drag Rank #2857 of 2996
40.1% (UK avg 26.6%) drag on savings
£210 fixed • ~£524 /yr value
Aspect Penalty View ranking →
East −19.8% West −21.6%
Typical output loss versus a south-facing roof (lower is better)

Seasonal solar output in HS4

Monthly generation per kilowatt of solar panels

kWh 16 Jan 33 Feb 69 Mar 102 Apr 118 May 114 Jun 105 Jul 92 Aug 66 Sep 43 Oct 22 Nov 11 Dec
Best month Worst month Winter (Dec–Feb) Other months

Winter output: 30.4% of an average month (Dec–Feb)

Best / worst month: May / Dec

These figures show output per kilowatt (kW) of panels installed. In winter, a 1 kW system here produces about 20 kWh per month; the average month produces around 66 kWh. So a typical 4 kW home system would generate roughly 80 kWh in winter, or 264 kWh in an average month.

Your Area at a Glance

Your Electricity Rate
26.42p/kWh
Daily Fixed Charge
57.55p/day
Local Sunshine
791kWh/kW
A 1 kW system generates ~791 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

Na h-Eileanan Siar (100%)

Areas Covered

Na Hearadh

Data Sources & Assumptions

Solar yield: PVGIS (EU Joint Research Centre), January 2025 data

Electricity rates: Ofgem price cap, Q3 2026

Installation costs: DESNZ/MCS data, March 2026 (TIC)

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.

Compare nearby areas

Nearby in Northern Scotland

PA84 (Na h-Eileanan Siar)
≈0.1 km away
Local sunshine: ~792 kWh/kWp · +0% vs HS4
PA85 (Na h-Eileanan Siar)
≈7.4 km away
Local sunshine: ~719 kWh/kWp · -9% vs HS4
HS3 (Na h-Eileanan Siar)
≈7.7 km away
Local sunshine: ~719 kWh/kWp · -9% vs HS4
PA83 (Na h-Eileanan Siar)
≈22.0 km away
Local sunshine: ~809 kWh/kWp · +2% vs HS4
HS5 (Na h-Eileanan Siar)
≈22.1 km away
Local sunshine: ~812 kWh/kWp · +3% vs HS4
HS1 (Na h-Eileanan Siar)
≈42.0 km away
Local sunshine: ~780 kWh/kWp · -1% vs HS4

Similar sunshine across the UK

LL57 (Gwynedd)
~792 kWh/kWp · +0% vs HS4
CA17 (Westmorland and Furness)
~792 kWh/kWp · +0% vs HS4
PA18 (Inverclyde)
~789 kWh/kWp · -0% vs HS4