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

Solar Panels in G72 (South Lanarkshire)

See if solar pays off for you in South Lanarkshire — 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
14.7 years
After this, it's pure profit
Upfront Cost
£12,207
What you pay to get started
Annual Benefit
£832
What you save every year
Profit Over 25 Years
£8,595
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 6.0 kW, with most eligible homes comfortably fitting within 3–6 kW. Each kilowatt of panels produces roughly 849 kWh per year on a south-facing roof. We value self-used electricity at 25.8p and exported surplus at a baseline 10p via SEG. Use the calculator above for your exact tariff.

Unit rate
25.8p/kWh
Standing charge
56.5p/day
Sunshine yield (south)
849 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: £693, Upfront: £10,173, Break-even: 14.7 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1698 kWh 679 kWh 1019 kWh £175 £102 £277 £4,069 14.7 yrs £1,478
3 kW 2547 kWh 1019 kWh 1528 kWh £263 £153 £416 £6,104 14.7 yrs £2,217
4 kW 3396 kWh 1358 kWh 2037 kWh £351 £204 £555 £8,138 14.7 yrs £2,956
5 kW 4245 kWh 1698 kWh 2547 kWh £439 £255 £693 £10,173 14.7 yrs £3,695
6 kW 5094 kWh 2037 kWh 3056 kWh £526 £306 £832 £12,207 14.7 yrs £4,434
7 kW 5942 kWh 2377 kWh 3565 kWh £614 £357 £971 £14,242 14.7 yrs £5,174
8 kW 6791 kWh 2717 kWh 4075 kWh £702 £407 £1,109 £16,276 14.7 yrs £5,913

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: £828, Upfront: £12,273, Break-even: 14.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1698 kWh 1019 kWh 679 kWh £263 £68 £331 £6,169 18.6 yrs £454
3 kW 2547 kWh 1528 kWh 1019 kWh £395 £102 £497 £8,204 16.5 yrs £1,731
4 kW 3396 kWh 2037 kWh 1358 kWh £526 £136 £662 £10,238 15.5 yrs £3,008
5 kW 4245 kWh 2547 kWh 1698 kWh £658 £170 £828 £12,273 14.8 yrs £4,285
6 kW 5094 kWh 3056 kWh 2037 kWh £790 £204 £993 £14,307 14.4 yrs £5,562
7 kW 5942 kWh 3565 kWh 2377 kWh £921 £238 £1,159 £16,342 14.1 yrs £6,839
8 kW 6791 kWh 4075 kWh 2717 kWh £1,053 £272 £1,325 £18,376 13.9 yrs £8,116

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: £895, Upfront: £13,673, Break-even: 15.3 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1698 kWh 1188 kWh 509 kWh £307 £51 £358 £7,569 21.1 yrs £-408
3 kW 2547 kWh 1783 kWh 764 kWh £461 £76 £537 £9,604 17.9 yrs £1,138
4 kW 3396 kWh 2377 kWh 1019 kWh £614 £102 £716 £11,638 16.3 yrs £2,684
5 kW 4245 kWh 2971 kWh 1273 kWh £768 £127 £895 £13,673 15.3 yrs £4,229
6 kW 5094 kWh 3565 kWh 1528 kWh £921 £153 £1,074 £15,707 14.6 yrs £5,775
7 kW 5942 kWh 4160 kWh 1783 kWh £1,075 £178 £1,253 £17,742 14.2 yrs £7,321
8 kW 6791 kWh 4754 kWh 2037 kWh £1,228 £204 £1,432 £19,776 13.8 yrs £8,867

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: £915, Upfront: £15,423, Break-even: 16.9 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1698 kWh 1239 kWh 458 kWh £320 £46 £366 £9,319 25.5 yrs £-1,997
3 kW 2547 kWh 1859 kWh 688 kWh £480 £69 £549 £11,354 20.7 yrs £-370
4 kW 3396 kWh 2479 kWh 917 kWh £641 £92 £732 £13,388 18.3 yrs £1,256
5 kW 4245 kWh 3099 kWh 1146 kWh £801 £115 £915 £15,423 16.9 yrs £2,883
6 kW 5094 kWh 3718 kWh 1375 kWh £961 £138 £1,098 £17,457 15.9 yrs £4,509
7 kW 5942 kWh 4338 kWh 1604 kWh £1,121 £160 £1,281 £19,492 15.2 yrs £6,136
8 kW 6791 kWh 4958 kWh 1834 kWh £1,281 £183 £1,464 £21,526 14.7 yrs £7,763

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: £929, Upfront: £17,173, Break-even: 18.5 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1698 kWh 1273 kWh 424 kWh £329 £42 £371 £11,069 29.8 yrs £-3,639
3 kW 2547 kWh 1910 kWh 637 kWh £494 £64 £557 £13,104 23.5 yrs £-1,959
4 kW 3396 kWh 2547 kWh 849 kWh £658 £85 £743 £15,138 20.4 yrs £-279
5 kW 4245 kWh 3183 kWh 1061 kWh £823 £106 £929 £17,173 18.5 yrs £1,402
6 kW 5094 kWh 3820 kWh 1273 kWh £987 £127 £1,114 £19,207 17.2 yrs £3,082
7 kW 5942 kWh 4457 kWh 1486 kWh £1,152 £149 £1,300 £21,242 16.3 yrs £4,763
8 kW 6791 kWh 5094 kWh 1698 kWh £1,316 £170 £1,486 £23,276 15.7 yrs £6,443

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: £942, Upfront: £19,623, Break-even: 20.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1698 kWh 1307 kWh 391 kWh £338 £39 £377 £13,519 35.9 yrs £-5,982
3 kW 2547 kWh 1961 kWh 586 kWh £507 £59 £565 £15,554 27.5 yrs £-4,248
4 kW 3396 kWh 2615 kWh 781 kWh £676 £78 £754 £17,588 23.3 yrs £-2,513
5 kW 4245 kWh 3268 kWh 976 kWh £845 £98 £942 £19,623 20.8 yrs £-779
6 kW 5094 kWh 3922 kWh 1172 kWh £1,013 £117 £1,131 £21,657 19.2 yrs £955
7 kW 5942 kWh 4576 kWh 1367 kWh £1,182 £137 £1,319 £23,692 18.0 yrs £2,689
8 kW 6791 kWh 5229 kWh 1562 kWh £1,351 £156 £1,507 £25,726 17.1 yrs £4,423

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
25.84p/kWh
Daily Fixed Charge
56.55p/day
Local Sunshine
849kWh/kW
A 1 kW system generates ~849 kWh per year. A typical home uses ~2,700 kWh per year.
Typical System Size
6.0kW
For houses & bungalows in this area

Local Property Data

Property Types

No EPC data available for this outcode

Coverage

South Lanarkshire (100%)

Areas Covered

Blantyre, Cambuslang East, Cambuslang West, Hamilton West and Earnock, Rutherglen Central and North, Hamilton North and East, East Kilbride East, Shettleston + 2 more

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.