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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in CH8 (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
12.9 years
After this, it's pure profit
Upfront Cost
£10,173
What you pay to get started
Annual Benefit
£790
What you save every year
Profit Over 25 Years
£9,581
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 925 kWh/kW — 5 below the regional median (930).

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 925 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)
925 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: £790, Upfront: £10,173, 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 1850 kWh 740 kWh 1110 kWh £205 £111 £316 £4,069 12.9 yrs £2,252
3 kW 2774 kWh 1110 kWh 1665 kWh £308 £166 £474 £6,104 12.9 yrs £3,378
4 kW 3699 kWh 1480 kWh 2220 kWh £410 £222 £632 £8,138 12.9 yrs £4,504
5 kW 4624 kWh 1850 kWh 2774 kWh £513 £277 £790 £10,173 12.9 yrs £5,631
6 kW 5549 kWh 2220 kWh 3329 kWh £615 £333 £948 £12,207 12.9 yrs £6,757
7 kW 6474 kWh 2589 kWh 3884 kWh £718 £388 £1,106 £14,242 12.9 yrs £7,883
8 kW 7398 kWh 2959 kWh 4439 kWh £820 £444 £1,264 £16,276 12.9 yrs £9,009

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: £954, 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 1850 kWh 1110 kWh 740 kWh £308 £74 £382 £6,169 16.2 yrs £1,463
3 kW 2774 kWh 1665 kWh 1110 kWh £461 £111 £572 £8,204 14.3 yrs £3,245
4 kW 3699 kWh 2220 kWh 1480 kWh £615 £148 £763 £10,238 13.4 yrs £5,027
5 kW 4624 kWh 2774 kWh 1850 kWh £769 £185 £954 £12,273 12.9 yrs £6,808
6 kW 5549 kWh 3329 kWh 2220 kWh £923 £222 £1,145 £14,307 12.5 yrs £8,590
7 kW 6474 kWh 3884 kWh 2589 kWh £1,077 £259 £1,336 £16,342 12.2 yrs £10,371
8 kW 7398 kWh 4439 kWh 2959 kWh £1,231 £296 £1,526 £18,376 12.0 yrs £12,153

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: £1,036, Upfront: £13,673, Break-even: 13.2 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1850 kWh 1295 kWh 555 kWh £359 £55 £414 £7,569 18.3 yrs £719
3 kW 2774 kWh 1942 kWh 832 kWh £538 £83 £622 £9,604 15.5 yrs £2,828
4 kW 3699 kWh 2589 kWh 1110 kWh £718 £111 £829 £11,638 14.0 yrs £4,938
5 kW 4624 kWh 3237 kWh 1387 kWh £897 £139 £1,036 £13,673 13.2 yrs £7,047
6 kW 5549 kWh 3884 kWh 1665 kWh £1,077 £166 £1,243 £15,707 12.6 yrs £9,156
7 kW 6474 kWh 4532 kWh 1942 kWh £1,256 £194 £1,450 £17,742 12.2 yrs £11,266
8 kW 7398 kWh 5179 kWh 2220 kWh £1,436 £222 £1,658 £19,776 11.9 yrs £13,375

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: £1,061, Upfront: £15,423, 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 1850 kWh 1350 kWh 499 kWh £374 £50 £424 £9,319 22.0 yrs £-835
3 kW 2774 kWh 2025 kWh 749 kWh £561 £75 £636 £11,354 17.8 yrs £1,373
4 kW 3699 kWh 2700 kWh 999 kWh £749 £100 £848 £13,388 15.8 yrs £3,581
5 kW 4624 kWh 3376 kWh 1248 kWh £936 £125 £1,061 £15,423 14.5 yrs £5,789
6 kW 5549 kWh 4051 kWh 1498 kWh £1,123 £150 £1,273 £17,457 13.7 yrs £7,996
7 kW 6474 kWh 4726 kWh 1748 kWh £1,310 £175 £1,485 £19,492 13.1 yrs £10,204
8 kW 7398 kWh 5401 kWh 1998 kWh £1,497 £200 £1,697 £21,526 12.7 yrs £12,412

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: £1,077, Upfront: £17,173, Break-even: 15.9 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1850 kWh 1387 kWh 462 kWh £385 £46 £431 £11,069 25.7 yrs £-2,453
3 kW 2774 kWh 2081 kWh 694 kWh £577 £69 £646 £13,104 20.3 yrs £-180
4 kW 3699 kWh 2774 kWh 925 kWh £769 £92 £862 £15,138 17.6 yrs £2,093
5 kW 4624 kWh 3468 kWh 1156 kWh £961 £116 £1,077 £17,173 15.9 yrs £4,366
6 kW 5549 kWh 4162 kWh 1387 kWh £1,154 £139 £1,292 £19,207 14.9 yrs £6,640
7 kW 6474 kWh 4855 kWh 1618 kWh £1,346 £162 £1,508 £21,242 14.1 yrs £8,913
8 kW 7398 kWh 5549 kWh 1850 kWh £1,538 £185 £1,723 £23,276 13.5 yrs £11,186

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: £1,093, Upfront: £19,623, Break-even: 17.9 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1850 kWh 1424 kWh 425 kWh £395 £43 £437 £13,519 30.9 yrs £-4,772
3 kW 2774 kWh 2136 kWh 638 kWh £592 £64 £656 £15,554 23.7 yrs £-2,434
4 kW 3699 kWh 2848 kWh 851 kWh £790 £85 £875 £17,588 20.1 yrs £-95
5 kW 4624 kWh 3561 kWh 1064 kWh £987 £106 £1,093 £19,623 17.9 yrs £2,244
6 kW 5549 kWh 4273 kWh 1276 kWh £1,184 £128 £1,312 £21,657 16.5 yrs £4,583
7 kW 6474 kWh 4985 kWh 1489 kWh £1,382 £149 £1,531 £23,692 15.5 yrs £6,922
8 kW 7398 kWh 5697 kWh 1702 kWh £1,579 £170 £1,749 £25,726 14.7 yrs £9,260

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 CH8

Figures below are tailored to CH8 — click through for full league tables.

Big-Roof Britain Rank #665 of 2182
5.4 kWp (UK avg 5.1 kWp)
~11 panels (≈430 W)
Solar Payback Index Rank #1330 of 2997
11.1 years (UK avg 11.3 years)
~£913 /yr • £10,173 upfront
Standing-Charge Drag Rank #2559 of 2997
28.0% (UK avg 21.7%) drag on savings
£255 fixed • ~£913 /yr value

Your Area at a Glance

Your Electricity Rate
27.72p/kWh
Daily Fixed Charge
69.95p/day
Local Sunshine
925kWh/kW
A 1 kW system generates ~925 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: 67% • Flats: 10% • Bungalows: 22% Based on 6,893 properties

Coverage

Flintshire (100%)

Areas Covered

Llanasa and Trelawnyd, Holywell Central, Brynford and Halkyn, Greenfield, Whitford, Holywell West, Mostyn, Holywell East + 4 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.

Compare nearby areas

Nearby in North Wales and Mersey

CH6 (Flintshire)
≈6.7 km away
Local sunshine: ~946 kWh/kWp · +2% vs CH8
CH60 (Wirral)
≈10.1 km away
Local sunshine: ~945 kWh/kWp · +2% vs CH8
L60 (Wirral)
≈10.1 km away
Local sunshine: ~945 kWh/kWp · +2% vs CH8
CH31 (Wirral)
≈10.2 km away
Local sunshine: ~945 kWh/kWp · +2% vs CH8
L48 (Wirral)
≈10.9 km away
Local sunshine: ~953 kWh/kWp · +3% vs CH8
CH33 (Cheshire West and Chester)
≈10.9 km away
Local sunshine: ~945 kWh/kWp · +2% vs CH8

Similar sunshine across the UK

DH7 (County Durham)
~925 kWh/kWp · -0% vs CH8
DY3 (Dudley)
~925 kWh/kWp · -0% vs CH8
NE10 (Gateshead)
~925 kWh/kWp · +0% vs CH8