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

Solar Panels in FK10 (Clackmannanshire)

See if solar pays off for you in Clackmannanshire — 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
£833
What you save every year
Profit Over 25 Years
£8,616
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 850 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)
850 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: £694, 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 1700 kWh 680 kWh 1020 kWh £176 £102 £278 £4,069 14.7 yrs £1,484
3 kW 2549 kWh 1020 kWh 1530 kWh £263 £153 £416 £6,104 14.7 yrs £2,226
4 kW 3399 kWh 1360 kWh 2039 kWh £351 £204 £555 £8,138 14.7 yrs £2,968
5 kW 4249 kWh 1700 kWh 2549 kWh £439 £255 £694 £10,173 14.7 yrs £3,709
6 kW 5099 kWh 2039 kWh 3059 kWh £527 £306 £833 £12,207 14.7 yrs £4,451
7 kW 5948 kWh 2379 kWh 3569 kWh £615 £357 £972 £14,242 14.7 yrs £5,193
8 kW 6798 kWh 2719 kWh 4079 kWh £703 £408 £1,111 £16,276 14.7 yrs £5,935

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: £829, 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 1700 kWh 1020 kWh 680 kWh £263 £68 £331 £6,169 18.6 yrs £461
3 kW 2549 kWh 1530 kWh 1020 kWh £395 £102 £497 £8,204 16.5 yrs £1,741
4 kW 3399 kWh 2039 kWh 1360 kWh £527 £136 £663 £10,238 15.4 yrs £3,021
5 kW 4249 kWh 2549 kWh 1700 kWh £659 £170 £829 £12,273 14.8 yrs £4,302
6 kW 5099 kWh 3059 kWh 2039 kWh £790 £204 £994 £14,307 14.4 yrs £5,582
7 kW 5948 kWh 3569 kWh 2379 kWh £922 £238 £1,160 £16,342 14.1 yrs £6,862
8 kW 6798 kWh 4079 kWh 2719 kWh £1,054 £272 £1,326 £18,376 13.9 yrs £8,142

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: £896, 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 1700 kWh 1190 kWh 510 kWh £307 £51 £358 £7,569 21.1 yrs £-401
3 kW 2549 kWh 1785 kWh 765 kWh £461 £76 £538 £9,604 17.9 yrs £1,149
4 kW 3399 kWh 2379 kWh 1020 kWh £615 £102 £717 £11,638 16.2 yrs £2,698
5 kW 4249 kWh 2974 kWh 1275 kWh £769 £127 £896 £13,673 15.3 yrs £4,248
6 kW 5099 kWh 3569 kWh 1530 kWh £922 £153 £1,075 £15,707 14.6 yrs £5,797
7 kW 5948 kWh 4164 kWh 1785 kWh £1,076 £178 £1,254 £17,742 14.1 yrs £7,347
8 kW 6798 kWh 4759 kWh 2039 kWh £1,230 £204 £1,434 £19,776 13.8 yrs £8,896

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: £916, Upfront: £15,423, Break-even: 16.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1700 kWh 1241 kWh 459 kWh £321 £46 £366 £9,319 25.4 yrs £-1,989
3 kW 2549 kWh 1861 kWh 688 kWh £481 £69 £550 £11,354 20.7 yrs £-359
4 kW 3399 kWh 2481 kWh 918 kWh £641 £92 £733 £13,388 18.3 yrs £1,271
5 kW 4249 kWh 3102 kWh 1147 kWh £801 £115 £916 £15,423 16.8 yrs £2,901
6 kW 5099 kWh 3722 kWh 1377 kWh £962 £138 £1,099 £17,457 15.9 yrs £4,532
7 kW 5948 kWh 4342 kWh 1606 kWh £1,122 £161 £1,283 £19,492 15.2 yrs £6,162
8 kW 6798 kWh 4963 kWh 1836 kWh £1,282 £184 £1,466 £21,526 14.7 yrs £7,792

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: £930, 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 1700 kWh 1275 kWh 425 kWh £329 £42 £372 £11,069 29.8 yrs £-3,632
3 kW 2549 kWh 1912 kWh 637 kWh £494 £64 £558 £13,104 23.5 yrs £-1,948
4 kW 3399 kWh 2549 kWh 850 kWh £659 £85 £744 £15,138 20.4 yrs £-263
5 kW 4249 kWh 3187 kWh 1062 kWh £823 £106 £930 £17,173 18.5 yrs £1,421
6 kW 5099 kWh 3824 kWh 1275 kWh £988 £127 £1,116 £19,207 17.2 yrs £3,105
7 kW 5948 kWh 4461 kWh 1487 kWh £1,153 £149 £1,302 £21,242 16.3 yrs £4,789
8 kW 6798 kWh 5099 kWh 1700 kWh £1,317 £170 £1,487 £23,276 15.6 yrs £6,473

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: £943, 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 1700 kWh 1309 kWh 391 kWh £338 £39 £377 £13,519 35.8 yrs £-5,974
3 kW 2549 kWh 1963 kWh 586 kWh £507 £59 £566 £15,554 27.5 yrs £-4,236
4 kW 3399 kWh 2617 kWh 782 kWh £676 £78 £754 £17,588 23.3 yrs £-2,498
5 kW 4249 kWh 3272 kWh 977 kWh £845 £98 £943 £19,623 20.8 yrs £-760
6 kW 5099 kWh 3926 kWh 1173 kWh £1,014 £117 £1,132 £21,657 19.1 yrs £978
7 kW 5948 kWh 4580 kWh 1368 kWh £1,184 £137 £1,320 £23,692 17.9 yrs £2,716
8 kW 6798 kWh 5235 kWh 1564 kWh £1,353 £156 £1,509 £25,726 17.0 yrs £4,454

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
850kWh/kW
A 1 kW system generates ~850 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

Clackmannanshire (89%)|Fife (11%)

Areas Covered

Clackmannanshire South, Clackmannanshire Central, Clackmannanshire West, Clackmannanshire East, West Fife and Coastal Villages

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.