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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in CH7 (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
12.7 years
After this, it's pure profit
Upfront Cost
£10,173
What you pay to get started
Annual Benefit
£803
What you save every year
Profit Over 25 Years
£9,909
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 940 kWh/kW — 10 above 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 940 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)
940 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: £803, 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 1880 kWh 752 kWh 1128 kWh £208 £113 £321 £4,069 12.7 yrs £2,357
3 kW 2820 kWh 1128 kWh 1692 kWh £313 £169 £482 £6,104 12.7 yrs £3,536
4 kW 3761 kWh 1504 kWh 2256 kWh £417 £226 £643 £8,138 12.7 yrs £4,714
5 kW 4701 kWh 1880 kWh 2820 kWh £521 £282 £803 £10,173 12.7 yrs £5,893
6 kW 5641 kWh 2256 kWh 3385 kWh £625 £338 £964 £12,207 12.7 yrs £7,071
7 kW 6581 kWh 2632 kWh 3949 kWh £730 £395 £1,125 £14,242 12.7 yrs £8,250
8 kW 7521 kWh 3009 kWh 4513 kWh £834 £451 £1,285 £16,276 12.7 yrs £9,429

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: £970, Upfront: £12,273, 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 1880 kWh 1128 kWh 752 kWh £313 £75 £388 £6,169 15.9 yrs £1,590
3 kW 2820 kWh 1692 kWh 1128 kWh £469 £113 £582 £8,204 14.1 yrs £3,435
4 kW 3761 kWh 2256 kWh 1504 kWh £625 £150 £776 £10,238 13.2 yrs £5,280
5 kW 4701 kWh 2820 kWh 1880 kWh £782 £188 £970 £12,273 12.7 yrs £7,125
6 kW 5641 kWh 3385 kWh 2256 kWh £938 £226 £1,164 £14,307 12.3 yrs £8,970
7 kW 6581 kWh 3949 kWh 2632 kWh £1,095 £263 £1,358 £16,342 12.0 yrs £10,815
8 kW 7521 kWh 4513 kWh 3009 kWh £1,251 £301 £1,552 £18,376 11.8 yrs £12,660

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: £1,053, Upfront: £13,673, Break-even: 13.0 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1880 kWh 1316 kWh 564 kWh £365 £56 £421 £7,569 18.0 yrs £856
3 kW 2820 kWh 1974 kWh 846 kWh £547 £85 £632 £9,604 15.2 yrs £3,034
4 kW 3761 kWh 2632 kWh 1128 kWh £730 £113 £843 £11,638 13.8 yrs £5,213
5 kW 4701 kWh 3291 kWh 1410 kWh £912 £141 £1,053 £13,673 13.0 yrs £7,391
6 kW 5641 kWh 3949 kWh 1692 kWh £1,095 £169 £1,264 £15,707 12.4 yrs £9,569
7 kW 6581 kWh 4607 kWh 1974 kWh £1,277 £197 £1,474 £17,742 12.0 yrs £11,747
8 kW 7521 kWh 5265 kWh 2256 kWh £1,459 £226 £1,685 £19,776 11.7 yrs £13,925

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: £1,078, Upfront: £15,423, Break-even: 14.3 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1880 kWh 1373 kWh 508 kWh £380 £51 £431 £9,319 21.6 yrs £-694
3 kW 2820 kWh 2059 kWh 762 kWh £571 £76 £647 £11,354 17.6 yrs £1,584
4 kW 3761 kWh 2745 kWh 1015 kWh £761 £102 £863 £13,388 15.5 yrs £3,862
5 kW 4701 kWh 3432 kWh 1269 kWh £951 £127 £1,078 £15,423 14.3 yrs £6,141
6 kW 5641 kWh 4118 kWh 1523 kWh £1,141 £152 £1,294 £17,457 13.5 yrs £8,419
7 kW 6581 kWh 4804 kWh 1777 kWh £1,332 £178 £1,509 £19,492 12.9 yrs £10,697
8 kW 7521 kWh 5491 kWh 2031 kWh £1,522 £203 £1,725 £21,526 12.5 yrs £12,975

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: £1,095, Upfront: £17,173, Break-even: 15.7 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1880 kWh 1410 kWh 470 kWh £391 £47 £438 £11,069 25.3 yrs £-2,310
3 kW 2820 kWh 2115 kWh 705 kWh £586 £71 £657 £13,104 19.9 yrs £34
4 kW 3761 kWh 2820 kWh 940 kWh £782 £94 £876 £15,138 17.3 yrs £2,379
5 kW 4701 kWh 3526 kWh 1175 kWh £977 £118 £1,095 £17,173 15.7 yrs £4,724
6 kW 5641 kWh 4231 kWh 1410 kWh £1,173 £141 £1,314 £19,207 14.6 yrs £7,069
7 kW 6581 kWh 4936 kWh 1645 kWh £1,368 £165 £1,533 £21,242 13.9 yrs £9,413
8 kW 7521 kWh 5641 kWh 1880 kWh £1,564 £188 £1,752 £23,276 13.3 yrs £11,758

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: £1,111, Upfront: £19,623, Break-even: 17.7 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1880 kWh 1448 kWh 432 kWh £401 £43 £445 £13,519 30.4 yrs £-4,627
3 kW 2820 kWh 2172 kWh 649 kWh £602 £65 £667 £15,554 23.3 yrs £-2,216
4 kW 3761 kWh 2896 kWh 865 kWh £803 £86 £889 £17,588 19.8 yrs £196
5 kW 4701 kWh 3620 kWh 1081 kWh £1,003 £108 £1,111 £19,623 17.7 yrs £2,607
6 kW 5641 kWh 4344 kWh 1297 kWh £1,204 £130 £1,334 £21,657 16.2 yrs £5,018
7 kW 6581 kWh 5067 kWh 1514 kWh £1,405 £151 £1,556 £23,692 15.2 yrs £7,430
8 kW 7521 kWh 5791 kWh 1730 kWh £1,605 £173 £1,778 £25,726 14.5 yrs £9,841

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 CH7

Figures below are tailored to CH7 — click through for full league tables.

Big-Roof Britain Rank #670 of 2182
5.4 kWp (UK avg 5.1 kWp)
~11 panels (≈430 W)
Solar Payback Index Rank #1191 of 2997
11.0 years (UK avg 11.3 years)
~£928 /yr • £10,173 upfront
Standing-Charge Drag Rank #2462 of 2997
27.5% (UK avg 21.7%) drag on savings
£255 fixed • ~£928 /yr value

Your Area at a Glance

Your Electricity Rate
27.72p/kWh
Daily Fixed Charge
69.95p/day
Local Sunshine
940kWh/kW
A 1 kW system generates ~940 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: 68% • Flats: 9% • Bungalows: 22% Based on 12,566 properties

Coverage

Flintshire (96%)|Denbighshire (4%)

Areas Covered

Mold: Broncoed, Northop, Buckley: Pentrobin, Argoed and New Brighton, Mold East, Gwernaffield and Gwernymynydd, Buckley: Bistre East, Buckley: Bistre West + 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

CH5 (Flintshire)
≈7.8 km away
Local sunshine: ~943 kWh/kWp · +0% vs CH7
CH6 (Flintshire)
≈8.8 km away
Local sunshine: ~946 kWh/kWp · +1% vs CH7
LL15 (Denbighshire)
≈13.1 km away
Local sunshine: ~885 kWh/kWp · -6% vs CH7
LL12 (Wrexham)
≈13.2 km away
Local sunshine: ~939 kWh/kWp · -0% vs CH7
CH8 (Flintshire)
≈13.7 km away
Local sunshine: ~925 kWh/kWp · -2% vs CH7
CH4 (Cheshire West and Chester)
≈14.4 km away
Local sunshine: ~942 kWh/kWp · +0% vs CH7

Similar sunshine across the UK

NE89 (Sunderland)
~940 kWh/kWp · -0% vs CH7
NE37 (Sunderland)
~940 kWh/kWp · +0% vs CH7
WF10 (Wakefield)
~940 kWh/kWp · -0% vs CH7