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

Solar Panels in CV33 (Stratford-on-Avon)

See if solar pays off for you in Stratford-on-Avon — 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
12.7 years
After this, it's pure profit
Upfront Cost
£10,173
What you pay to get started
Annual Benefit
£798
What you save every year
Profit Over 25 Years
£9,774
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 984 kWh per year on a south-facing roof. We value self-used electricity at 25.6p and exported surplus at a baseline 10p via SEG. Use the calculator above for your exact tariff.

Unit rate
25.6p/kWh
Standing charge
49.1p/day
Sunshine yield (south)
984 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: £798, Upfront: £10,173, Break-even: 12.7 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1968 kWh 787 kWh 1181 kWh £201 £118 £319 £4,069 12.7 yrs £2,314
3 kW 2951 kWh 1181 kWh 1771 kWh £302 £177 £479 £6,104 12.7 yrs £3,471
4 kW 3935 kWh 1574 kWh 2361 kWh £402 £236 £638 £8,138 12.7 yrs £4,628
5 kW 4919 kWh 1968 kWh 2951 kWh £503 £295 £798 £10,173 12.7 yrs £5,785
6 kW 5903 kWh 2361 kWh 3542 kWh £603 £354 £957 £12,207 12.7 yrs £6,941
7 kW 6887 kWh 2755 kWh 4132 kWh £704 £413 £1,117 £14,242 12.7 yrs £8,098
8 kW 7870 kWh 3148 kWh 4722 kWh £804 £472 £1,277 £16,276 12.7 yrs £9,255

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: £951, Upfront: £12,273, Break-even: 12.9 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1968 kWh 1181 kWh 787 kWh £302 £79 £380 £6,169 16.2 yrs £1,438
3 kW 2951 kWh 1771 kWh 1181 kWh £452 £118 £570 £8,204 14.4 yrs £3,206
4 kW 3935 kWh 2361 kWh 1574 kWh £603 £157 £761 £10,238 13.5 yrs £4,975
5 kW 4919 kWh 2951 kWh 1968 kWh £754 £197 £951 £12,273 12.9 yrs £6,744
6 kW 5903 kWh 3542 kWh 2361 kWh £905 £236 £1,141 £14,307 12.5 yrs £8,513
7 kW 6887 kWh 4132 kWh 2755 kWh £1,056 £275 £1,331 £16,342 12.3 yrs £10,282
8 kW 7870 kWh 4722 kWh 3148 kWh £1,207 £315 £1,521 £18,376 12.1 yrs £12,051

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: £1,027, Upfront: £13,673, Break-even: 13.3 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1968 kWh 1377 kWh 590 kWh £352 £59 £411 £7,569 18.4 yrs £650
3 kW 2951 kWh 2066 kWh 885 kWh £528 £89 £616 £9,604 15.6 yrs £2,724
4 kW 3935 kWh 2755 kWh 1181 kWh £704 £118 £822 £11,638 14.2 yrs £4,799
5 kW 4919 kWh 3443 kWh 1476 kWh £880 £148 £1,027 £13,673 13.3 yrs £6,874
6 kW 5903 kWh 4132 kWh 1771 kWh £1,056 £177 £1,233 £15,707 12.7 yrs £8,949
7 kW 6887 kWh 4821 kWh 2066 kWh £1,232 £207 £1,438 £17,742 12.3 yrs £11,023
8 kW 7870 kWh 5509 kWh 2361 kWh £1,408 £236 £1,644 £19,776 12.0 yrs £13,098

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: £1,050, Upfront: £15,423, 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 1968 kWh 1436 kWh 531 kWh £367 £53 £420 £9,319 22.2 yrs £-917
3 kW 2951 kWh 2155 kWh 797 kWh £550 £80 £630 £11,354 18.0 yrs £1,250
4 kW 3935 kWh 2873 kWh 1062 kWh £734 £106 £840 £13,388 15.9 yrs £3,416
5 kW 4919 kWh 3591 kWh 1328 kWh £917 £133 £1,050 £15,423 14.7 yrs £5,583
6 kW 5903 kWh 4309 kWh 1594 kWh £1,101 £159 £1,260 £17,457 13.9 yrs £7,749
7 kW 6887 kWh 5027 kWh 1859 kWh £1,284 £186 £1,470 £19,492 13.3 yrs £9,916
8 kW 7870 kWh 5745 kWh 2125 kWh £1,468 £212 £1,680 £21,526 12.8 yrs £12,083

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: £1,066, Upfront: £17,173, Break-even: 16.1 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1968 kWh 1476 kWh 492 kWh £377 £49 £426 £11,069 26.0 yrs £-2,544
3 kW 2951 kWh 2214 kWh 738 kWh £566 £74 £639 £13,104 20.5 yrs £-317
4 kW 3935 kWh 2951 kWh 984 kWh £754 £98 £852 £15,138 17.8 yrs £1,911
5 kW 4919 kWh 3689 kWh 1230 kWh £943 £123 £1,066 £17,173 16.1 yrs £4,139
6 kW 5903 kWh 4427 kWh 1476 kWh £1,131 £148 £1,279 £19,207 15.0 yrs £6,367
7 kW 6887 kWh 5165 kWh 1722 kWh £1,320 £172 £1,492 £21,242 14.2 yrs £8,594
8 kW 7870 kWh 5903 kWh 1968 kWh £1,508 £197 £1,705 £23,276 13.7 yrs £10,822

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: £1,081, Upfront: £19,623, Break-even: 18.2 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1968 kWh 1515 kWh 453 kWh £387 £45 £432 £13,519 31.3 yrs £-4,872
3 kW 2951 kWh 2273 kWh 679 kWh £581 £68 £649 £15,554 24.0 yrs £-2,583
4 kW 3935 kWh 3030 kWh 905 kWh £774 £91 £865 £17,588 20.3 yrs £-294
5 kW 4919 kWh 3788 kWh 1131 kWh £968 £113 £1,081 £19,623 18.2 yrs £1,995
6 kW 5903 kWh 4545 kWh 1358 kWh £1,161 £136 £1,297 £21,657 16.7 yrs £4,284
7 kW 6887 kWh 5303 kWh 1584 kWh £1,355 £158 £1,513 £23,692 15.7 yrs £6,573
8 kW 7870 kWh 6060 kWh 1810 kWh £1,548 £181 £1,729 £25,726 14.9 yrs £8,862

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
25.55p/kWh
Daily Fixed Charge
49.09p/day
Local Sunshine
984kWh/kW
A 1 kW system generates ~984 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

Houses: 84% • Flats: 6% • Bungalows: 8% Based on 3,618 properties

Coverage

Stratford-on-Avon (72%)|Warwick (28%)

Areas Covered

Harbury, Bishop's Itchington, Fenny Compton & Napton, Gaydon, Kineton & Upper Lighthorne, Bishop's Tachbrook, Radford Semele, Southam West + 7 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.