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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in CH6 (Flintshire)

See if solar pays off for you in Flintshire — 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
12.6 years
After this, it's pure profit
Upfront Cost
£8,138
What you pay to get started
Annual Benefit
£646
What you save every year
Profit Over 25 Years
£8,024
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

In North Wales and Mersey, the current unit rate is 27.72p/kWh with a 69.95p/day standing charge. Your postcode’s south-facing sunshine yield is 946 kWh/kW — 16 above the regional median (930).

Read the full story

A typical roof here lands around 4.0 kW, with most eligible homes comfortably fitting within 3–6 kW. Each kilowatt of panels produces roughly 946 kWh per year on a south-facing roof. We value self-used electricity at 27.7p and exported surplus at a baseline 10p via SEG. Use the calculator above for your exact tariff.

Unit rate
27.7p/kWh
Standing charge
70.0p/day
Sunshine yield (south)
946 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: £808, Upfront: £10,173, Break-even: 12.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1892 kWh 757 kWh 1135 kWh £210 £113 £323 £4,069 12.6 yrs £2,396
3 kW 2837 kWh 1135 kWh 1702 kWh £315 £170 £485 £6,104 12.6 yrs £3,594
4 kW 3783 kWh 1513 kWh 2270 kWh £419 £227 £646 £8,138 12.6 yrs £4,791
5 kW 4729 kWh 1892 kWh 2837 kWh £524 £284 £808 £10,173 12.6 yrs £5,989
6 kW 5675 kWh 2270 kWh 3405 kWh £629 £340 £970 £12,207 12.6 yrs £7,187
7 kW 6621 kWh 2648 kWh 3972 kWh £734 £397 £1,131 £14,242 12.6 yrs £8,385
8 kW 7566 kWh 3027 kWh 4540 kWh £839 £454 £1,293 £16,276 12.6 yrs £9,583

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: £976, Upfront: £12,273, Break-even: 12.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1892 kWh 1135 kWh 757 kWh £315 £76 £390 £6,169 15.8 yrs £1,636
3 kW 2837 kWh 1702 kWh 1135 kWh £472 £113 £585 £8,204 14.0 yrs £3,505
4 kW 3783 kWh 2270 kWh 1513 kWh £629 £151 £781 £10,238 13.1 yrs £5,373
5 kW 4729 kWh 2837 kWh 1892 kWh £787 £189 £976 £12,273 12.6 yrs £7,241
6 kW 5675 kWh 3405 kWh 2270 kWh £944 £227 £1,171 £14,307 12.2 yrs £9,109
7 kW 6621 kWh 3972 kWh 2648 kWh £1,101 £265 £1,366 £16,342 12.0 yrs £10,978
8 kW 7566 kWh 4540 kWh 3027 kWh £1,258 £303 £1,561 £18,376 11.8 yrs £12,846

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: £1,059, Upfront: £13,673, 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 1892 kWh 1324 kWh 567 kWh £367 £57 £424 £7,569 17.9 yrs £907
3 kW 2837 kWh 1986 kWh 851 kWh £551 £85 £636 £9,604 15.1 yrs £3,110
4 kW 3783 kWh 2648 kWh 1135 kWh £734 £113 £848 £11,638 13.7 yrs £5,314
5 kW 4729 kWh 3310 kWh 1419 kWh £918 £142 £1,059 £13,673 12.9 yrs £7,517
6 kW 5675 kWh 3972 kWh 1702 kWh £1,101 £170 £1,271 £15,707 12.4 yrs £9,721
7 kW 6621 kWh 4634 kWh 1986 kWh £1,285 £199 £1,483 £17,742 12.0 yrs £11,924
8 kW 7566 kWh 5296 kWh 2270 kWh £1,468 £227 £1,695 £19,776 11.7 yrs £14,127

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: £1,085, Upfront: £15,423, Break-even: 14.2 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1892 kWh 1381 kWh 511 kWh £383 £51 £434 £9,319 21.5 yrs £-642
3 kW 2837 kWh 2071 kWh 766 kWh £574 £77 £651 £11,354 17.4 yrs £1,662
4 kW 3783 kWh 2762 kWh 1021 kWh £766 £102 £868 £13,388 15.4 yrs £3,966
5 kW 4729 kWh 3452 kWh 1277 kWh £957 £128 £1,085 £15,423 14.2 yrs £6,270
6 kW 5675 kWh 4143 kWh 1532 kWh £1,148 £153 £1,302 £17,457 13.4 yrs £8,574
7 kW 6621 kWh 4833 kWh 1788 kWh £1,340 £179 £1,518 £19,492 12.8 yrs £10,878
8 kW 7566 kWh 5523 kWh 2043 kWh £1,531 £204 £1,735 £21,526 12.4 yrs £13,182

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: £1,101, Upfront: £17,173, Break-even: 15.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1892 kWh 1419 kWh 473 kWh £393 £47 £441 £11,069 25.1 yrs £-2,258
3 kW 2837 kWh 2128 kWh 709 kWh £590 £71 £661 £13,104 19.8 yrs £113
4 kW 3783 kWh 2837 kWh 946 kWh £787 £95 £881 £15,138 17.2 yrs £2,484
5 kW 4729 kWh 3547 kWh 1182 kWh £983 £118 £1,101 £17,173 15.6 yrs £4,855
6 kW 5675 kWh 4256 kWh 1419 kWh £1,180 £142 £1,322 £19,207 14.5 yrs £7,226
7 kW 6621 kWh 4965 kWh 1655 kWh £1,376 £166 £1,542 £21,242 13.8 yrs £9,597
8 kW 7566 kWh 5675 kWh 1892 kWh £1,573 £189 £1,762 £23,276 13.2 yrs £11,968

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: £1,118, Upfront: £19,623, Break-even: 17.5 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1892 kWh 1457 kWh 435 kWh £404 £44 £447 £13,519 30.2 yrs £-4,574
3 kW 2837 kWh 2185 kWh 653 kWh £606 £65 £671 £15,554 23.2 yrs £-2,136
4 kW 3783 kWh 2913 kWh 870 kWh £808 £87 £895 £17,588 19.7 yrs £302
5 kW 4729 kWh 3641 kWh 1088 kWh £1,009 £109 £1,118 £19,623 17.5 yrs £2,740
6 kW 5675 kWh 4370 kWh 1305 kWh £1,211 £131 £1,342 £21,657 16.1 yrs £5,178
7 kW 6621 kWh 5098 kWh 1523 kWh £1,413 £152 £1,565 £23,692 15.1 yrs £7,616
8 kW 7566 kWh 5826 kWh 1740 kWh £1,615 £174 £1,789 £25,726 14.4 yrs £10,055

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.

Insights for CH6

Figures below are tailored to CH6 — click through for full league tables.

Big-Roof Britain Rank #1433 of 2182
4.7 kWp (UK avg 5.1 kWp)
~10 panels (≈430 W)
Solar Payback Index Rank #1111 of 2997
10.9 years (UK avg 11.3 years)
~£747 /yr • £8,138 upfront
Standing-Charge Drag Rank #2805 of 2997
34.2% (UK avg 21.7%) drag on savings
£255 fixed • ~£747 /yr value

Your Area at a Glance

Your Electricity Rate
27.72p/kWh
Daily Fixed Charge
69.95p/day
Local Sunshine
946kWh/kW
A 1 kW system generates ~946 kWh per year. A typical home uses ~2,700 kWh per year.
Typical System Size
4.0kW
For houses & bungalows in this area

Local Property Data

Property Types

Houses: 70% • Flats: 18% • Bungalows: 11% Based on 5,177 properties

Coverage

Flintshire (100%)

Areas Covered

Flint: Coleshill and Trelawny, Bagillt, Flint: Castle, Flint: Oakenholt, Connah's Quay: Golftyn, Brynford and Halkyn, Holywell East

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.

Compare nearby areas

Nearby in North Wales and Mersey

CH8 (Flintshire)
≈6.7 km away
Local sunshine: ~925 kWh/kWp · -2% vs CH6
CH33 (Cheshire West and Chester)
≈7.2 km away
Local sunshine: ~945 kWh/kWp · -0% vs CH6
CH64 (Cheshire West and Chester)
≈7.4 km away
Local sunshine: ~945 kWh/kWp · -0% vs CH6
L64 (Cheshire West and Chester)
≈7.4 km away
Local sunshine: ~945 kWh/kWp · -0% vs CH6
CH5 (Flintshire)
≈8.0 km away
Local sunshine: ~943 kWh/kWp · -0% vs CH6
CH7 (Flintshire)
≈8.8 km away
Local sunshine: ~940 kWh/kWp · -1% vs CH6

Similar sunshine across the UK

SY7 (Shropshire)
~946 kWh/kWp · +0% vs CH6
DE7 (Erewash)
~946 kWh/kWp · +0% vs CH6
S31 (Rotherham)
~946 kWh/kWp · -0% vs CH6