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

Solar Panels in PA72 (Argyll and Bute)

See if solar pays off for you in Argyll and Bute — 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
16.2 years
After this, it's pure profit
Upfront Cost
£10,173
What you pay to get started
Annual Benefit
£626
What you save every year
Profit Over 25 Years
£5,489
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 745 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)
745 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: £626, Upfront: £10,173, Break-even: 16.2 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1489 kWh 596 kWh 894 kWh £161 £89 £251 £4,069 16.2 yrs £943
3 kW 2234 kWh 894 kWh 1340 kWh £242 £134 £376 £6,104 16.2 yrs £1,414
4 kW 2979 kWh 1192 kWh 1787 kWh £322 £179 £501 £8,138 16.2 yrs £1,885
5 kW 3724 kWh 1489 kWh 2234 kWh £403 £223 £626 £10,173 16.2 yrs £2,357
6 kW 4468 kWh 1787 kWh 2681 kWh £484 £268 £752 £12,207 16.2 yrs £2,828
7 kW 5213 kWh 2085 kWh 3128 kWh £564 £313 £877 £14,242 16.2 yrs £3,299
8 kW 5958 kWh 2383 kWh 3575 kWh £645 £357 £1,002 £16,276 16.2 yrs £3,771

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: £754, Upfront: £12,273, 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 1489 kWh 894 kWh 596 kWh £242 £60 £301 £6,169 20.5 yrs £-141
3 kW 2234 kWh 1340 kWh 894 kWh £363 £89 £452 £8,204 18.1 yrs £839
4 kW 2979 kWh 1787 kWh 1192 kWh £484 £119 £603 £10,238 17.0 yrs £1,818
5 kW 3724 kWh 2234 kWh 1489 kWh £605 £149 £754 £12,273 16.3 yrs £2,798
6 kW 4468 kWh 2681 kWh 1787 kWh £725 £179 £904 £14,307 15.8 yrs £3,777
7 kW 5213 kWh 3128 kWh 2085 kWh £846 £209 £1,055 £16,342 15.5 yrs £4,757
8 kW 5958 kWh 3575 kWh 2383 kWh £967 £238 £1,206 £18,376 15.2 yrs £5,736

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: £817, Upfront: £13,673, Break-even: 16.7 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1489 kWh 1043 kWh 447 kWh £282 £45 £327 £7,569 23.2 yrs £-1,033
3 kW 2234 kWh 1564 kWh 670 kWh £423 £67 £490 £9,604 19.6 yrs £201
4 kW 2979 kWh 2085 kWh 894 kWh £564 £89 £654 £11,638 17.8 yrs £1,434
5 kW 3724 kWh 2607 kWh 1117 kWh £705 £112 £817 £13,673 16.7 yrs £2,668
6 kW 4468 kWh 3128 kWh 1340 kWh £846 £134 £980 £15,707 16.0 yrs £3,902
7 kW 5213 kWh 3649 kWh 1564 kWh £987 £156 £1,144 £17,742 15.5 yrs £5,135
8 kW 5958 kWh 4170 kWh 1787 kWh £1,129 £179 £1,307 £19,776 15.1 yrs £6,369

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: £836, Upfront: £15,423, Break-even: 18.4 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1489 kWh 1087 kWh 402 kWh £294 £40 £334 £9,319 27.9 yrs £-2,630
3 kW 2234 kWh 1631 kWh 603 kWh £441 £60 £502 £11,354 22.6 yrs £-1,320
4 kW 2979 kWh 2175 kWh 804 kWh £588 £80 £669 £13,388 20.0 yrs £-11
5 kW 3724 kWh 2718 kWh 1005 kWh £736 £101 £836 £15,423 18.4 yrs £1,299
6 kW 4468 kWh 3262 kWh 1206 kWh £883 £121 £1,003 £17,457 17.4 yrs £2,609
7 kW 5213 kWh 3806 kWh 1408 kWh £1,030 £141 £1,171 £19,492 16.7 yrs £3,919
8 kW 5958 kWh 4349 kWh 1609 kWh £1,177 £161 £1,338 £21,526 16.1 yrs £5,229

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: £849, Upfront: £17,173, Break-even: 20.2 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1489 kWh 1117 kWh 372 kWh £302 £37 £340 £11,069 32.6 yrs £-4,279
3 kW 2234 kWh 1676 kWh 559 kWh £453 £56 £509 £13,104 25.7 yrs £-2,918
4 kW 2979 kWh 2234 kWh 745 kWh £605 £74 £679 £15,138 22.3 yrs £-1,557
5 kW 3724 kWh 2793 kWh 931 kWh £756 £93 £849 £17,173 20.2 yrs £-197
6 kW 4468 kWh 3351 kWh 1117 kWh £907 £112 £1,019 £19,207 18.9 yrs £1,164
7 kW 5213 kWh 3910 kWh 1303 kWh £1,058 £130 £1,188 £21,242 17.9 yrs £2,525
8 kW 5958 kWh 4468 kWh 1489 kWh £1,209 £149 £1,358 £23,276 17.1 yrs £3,885

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: £861, Upfront: £19,623, Break-even: 22.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1489 kWh 1147 kWh 343 kWh £310 £34 £345 £13,519 39.2 yrs £-6,627
3 kW 2234 kWh 1720 kWh 514 kWh £466 £51 £517 £15,554 30.1 yrs £-5,216
4 kW 2979 kWh 2294 kWh 685 kWh £621 £69 £689 £17,588 25.5 yrs £-3,804
5 kW 3724 kWh 2867 kWh 856 kWh £776 £86 £861 £19,623 22.8 yrs £-2,393
6 kW 4468 kWh 3441 kWh 1028 kWh £931 £103 £1,034 £21,657 20.9 yrs £-981
7 kW 5213 kWh 4014 kWh 1199 kWh £1,086 £120 £1,206 £23,692 19.6 yrs £430
8 kW 5958 kWh 4587 kWh 1370 kWh £1,241 £137 £1,378 £25,726 18.7 yrs £1,842

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
745kWh/kW
A 1 kW system generates ~745 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

Argyll and Bute (100%)

Areas Covered

Oban South and the Isles

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.