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

Solar Panels in FK7 (Stirling)

See if solar pays off for you in Stirling — 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
14.5 years
After this, it's pure profit
Upfront Cost
£12,207
What you pay to get started
Annual Benefit
£841
What you save every year
Profit Over 25 Years
£8,816
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 858 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)
858 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: £701, Upfront: £10,173, Break-even: 14.5 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1716 kWh 686 kWh 1030 kWh £177 £103 £280 £4,069 14.5 yrs £1,537
3 kW 2574 kWh 1030 kWh 1544 kWh £266 £154 £420 £6,104 14.5 yrs £2,306
4 kW 3432 kWh 1373 kWh 2059 kWh £355 £206 £561 £8,138 14.5 yrs £3,074
5 kW 4290 kWh 1716 kWh 2574 kWh £443 £257 £701 £10,173 14.5 yrs £3,843
6 kW 5148 kWh 2059 kWh 3089 kWh £532 £309 £841 £12,207 14.5 yrs £4,611
7 kW 6006 kWh 2402 kWh 3603 kWh £621 £360 £981 £14,242 14.5 yrs £5,380
8 kW 6864 kWh 2745 kWh 4118 kWh £709 £412 £1,121 £16,276 14.5 yrs £6,148

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: £837, Upfront: £12,273, 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 1716 kWh 1030 kWh 686 kWh £266 £69 £335 £6,169 18.4 yrs £524
3 kW 2574 kWh 1544 kWh 1030 kWh £399 £103 £502 £8,204 16.3 yrs £1,836
4 kW 3432 kWh 2059 kWh 1373 kWh £532 £137 £669 £10,238 15.3 yrs £3,149
5 kW 4290 kWh 2574 kWh 1716 kWh £665 £172 £837 £12,273 14.7 yrs £4,461
6 kW 5148 kWh 3089 kWh 2059 kWh £798 £206 £1,004 £14,307 14.3 yrs £5,773
7 kW 6006 kWh 3603 kWh 2402 kWh £931 £240 £1,171 £16,342 14.0 yrs £7,085
8 kW 6864 kWh 4118 kWh 2745 kWh £1,064 £275 £1,339 £18,376 13.7 yrs £8,397

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: £905, Upfront: £13,673, Break-even: 15.1 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1716 kWh 1201 kWh 515 kWh £310 £51 £362 £7,569 20.9 yrs £-332
3 kW 2574 kWh 1802 kWh 772 kWh £466 £77 £543 £9,604 17.7 yrs £1,252
4 kW 3432 kWh 2402 kWh 1030 kWh £621 £103 £724 £11,638 16.1 yrs £2,836
5 kW 4290 kWh 3003 kWh 1287 kWh £776 £129 £905 £13,673 15.1 yrs £4,420
6 kW 5148 kWh 3603 kWh 1544 kWh £931 £154 £1,086 £15,707 14.5 yrs £6,004
7 kW 6006 kWh 4204 kWh 1802 kWh £1,086 £180 £1,266 £17,742 14.0 yrs £7,588
8 kW 6864 kWh 4804 kWh 2059 kWh £1,241 £206 £1,447 £19,776 13.7 yrs £9,172

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: £925, Upfront: £15,423, 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 1716 kWh 1253 kWh 463 kWh £324 £46 £370 £9,319 25.2 yrs £-1,919
3 kW 2574 kWh 1879 kWh 695 kWh £486 £69 £555 £11,354 20.5 yrs £-254
4 kW 3432 kWh 2505 kWh 927 kWh £647 £93 £740 £13,388 18.1 yrs £1,412
5 kW 4290 kWh 3131 kWh 1158 kWh £809 £116 £925 £15,423 16.7 yrs £3,077
6 kW 5148 kWh 3758 kWh 1390 kWh £971 £139 £1,110 £17,457 15.7 yrs £4,743
7 kW 6006 kWh 4384 kWh 1622 kWh £1,133 £162 £1,295 £19,492 15.1 yrs £6,408
8 kW 6864 kWh 5010 kWh 1853 kWh £1,295 £185 £1,480 £21,526 14.5 yrs £8,074

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: £939, Upfront: £17,173, Break-even: 18.3 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1716 kWh 1287 kWh 429 kWh £333 £43 £375 £11,069 29.5 yrs £-3,560
3 kW 2574 kWh 1930 kWh 643 kWh £499 £64 £563 £13,104 23.3 yrs £-1,840
4 kW 3432 kWh 2574 kWh 858 kWh £665 £86 £751 £15,138 20.2 yrs £-121
5 kW 4290 kWh 3217 kWh 1072 kWh £831 £107 £939 £17,173 18.3 yrs £1,599
6 kW 5148 kWh 3861 kWh 1287 kWh £998 £129 £1,126 £19,207 17.1 yrs £3,319
7 kW 6006 kWh 4504 kWh 1501 kWh £1,164 £150 £1,314 £21,242 16.2 yrs £5,039
8 kW 6864 kWh 5148 kWh 1716 kWh £1,330 £172 £1,502 £23,276 15.5 yrs £6,759

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: £952, Upfront: £19,623, Break-even: 20.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1716 kWh 1321 kWh 395 kWh £341 £39 £381 £13,519 35.5 yrs £-5,902
3 kW 2574 kWh 1982 kWh 592 kWh £512 £59 £571 £15,554 27.2 yrs £-4,127
4 kW 3432 kWh 2642 kWh 789 kWh £683 £79 £762 £17,588 23.1 yrs £-2,353
5 kW 4290 kWh 3303 kWh 987 kWh £854 £99 £952 £19,623 20.6 yrs £-579
6 kW 5148 kWh 3964 kWh 1184 kWh £1,024 £118 £1,143 £21,657 19.0 yrs £1,195
7 kW 6006 kWh 4624 kWh 1381 kWh £1,195 £138 £1,333 £23,692 17.8 yrs £2,969
8 kW 6864 kWh 5285 kWh 1579 kWh £1,366 £158 £1,523 £25,726 16.9 yrs £4,744

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
858kWh/kW
A 1 kW system generates ~858 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

Stirling (99%)|Falkirk (1%)

Areas Covered

Stirling East, Bannockburn, Stirling West, Carse, Kinnaird and Tryst, Stirling North

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.