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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in BT44 (Causeway Coast and Glens)

See if solar pays off for you in Causeway Coast and Glens — price, savings and payback in under a minute (official UK data).

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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
39.1 years
After this, it's pure profit
Upfront Cost
£12,207
What you pay to get started
Annual Benefit
£313
What you save every year
Profit Over 25 Years
£-4,394
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 Northern Ireland, the current unit rate is 0.00p/kWh with a 0.00p/day standing charge. Your postcode’s south-facing sunshine yield is 868 kWh/kW — 123 below the regional median (991).

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 868 kWh per year on a south-facing roof. We value self-used electricity at 0.0p and exported surplus at a baseline 10p via SEG. Use the calculator above for your exact tariff.

Unit rate
0.0p/kWh
Standing charge
0.0p/day
Sunshine yield (south)
868 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: £260, Upfront: £10,173, Break-even: 39.1 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1736 kWh 694 kWh 1042 kWh £0 £104 £104 £4,069 39.1 yrs £-1,986
3 kW 2604 kWh 1042 kWh 1563 kWh £0 £156 £156 £6,104 39.1 yrs £-2,978
4 kW 3472 kWh 1389 kWh 2083 kWh £0 £208 £208 £8,138 39.1 yrs £-3,971
5 kW 4340 kWh 1736 kWh 2604 kWh £0 £260 £260 £10,173 39.1 yrs £-4,964
6 kW 5208 kWh 2083 kWh 3125 kWh £0 £313 £313 £12,207 39.1 yrs £-5,957
7 kW 6077 kWh 2431 kWh 3646 kWh £0 £365 £365 £14,242 39.1 yrs £-6,950
8 kW 6945 kWh 2778 kWh 4167 kWh £0 £417 £417 £16,276 39.1 yrs £-7,943

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: £174, Upfront: £12,273, Break-even: 70.7 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1736 kWh 1042 kWh 694 kWh £0 £69 £69 £6,169 88.8 yrs £-4,780
3 kW 2604 kWh 1563 kWh 1042 kWh £0 £104 £104 £8,204 78.8 yrs £-6,120
4 kW 3472 kWh 2083 kWh 1389 kWh £0 £139 £139 £10,238 73.7 yrs £-7,460
5 kW 4340 kWh 2604 kWh 1736 kWh £0 £174 £174 £12,273 70.7 yrs £-8,800
6 kW 5208 kWh 3125 kWh 2083 kWh £0 £208 £208 £14,307 68.7 yrs £-10,140
7 kW 6077 kWh 3646 kWh 2431 kWh £0 £243 £243 £16,342 67.2 yrs £-11,480
8 kW 6945 kWh 4167 kWh 2778 kWh £0 £278 £278 £18,376 66.2 yrs £-12,820

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: £130, Upfront: £13,673, Break-even: 105.0 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1736 kWh 1215 kWh 521 kWh £0 £52 £52 £7,569 145.3 yrs £-6,527
3 kW 2604 kWh 1823 kWh 781 kWh £0 £78 £78 £9,604 122.9 yrs £-8,041
4 kW 3472 kWh 2431 kWh 1042 kWh £0 £104 £104 £11,638 111.7 yrs £-9,555
5 kW 4340 kWh 3038 kWh 1302 kWh £0 £130 £130 £13,673 105.0 yrs £-11,068
6 kW 5208 kWh 3646 kWh 1563 kWh £0 £156 £156 £15,707 100.5 yrs £-12,582
7 kW 6077 kWh 4254 kWh 1823 kWh £0 £182 £182 £17,742 97.3 yrs £-14,096
8 kW 6945 kWh 4861 kWh 2083 kWh £0 £208 £208 £19,776 94.9 yrs £-15,609

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: £117, Upfront: £15,423, Break-even: 131.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1736 kWh 1267 kWh 469 kWh £0 £47 £47 £9,319 198.8 yrs £-8,381
3 kW 2604 kWh 1901 kWh 703 kWh £0 £70 £70 £11,354 161.5 yrs £-9,947
4 kW 3472 kWh 2535 kWh 938 kWh £0 £94 £94 £13,388 142.8 yrs £-11,513
5 kW 4340 kWh 3168 kWh 1172 kWh £0 £117 £117 £15,423 131.6 yrs £-13,079
6 kW 5208 kWh 3802 kWh 1406 kWh £0 £141 £141 £17,457 124.1 yrs £-14,644
7 kW 6077 kWh 4436 kWh 1641 kWh £0 £164 £164 £19,492 118.8 yrs £-16,210
8 kW 6945 kWh 5070 kWh 1875 kWh £0 £188 £188 £21,526 114.8 yrs £-17,776

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: £109, Upfront: £17,173, Break-even: 158.3 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1736 kWh 1302 kWh 434 kWh £0 £43 £43 £11,069 255.0 yrs £-10,201
3 kW 2604 kWh 1953 kWh 651 kWh £0 £65 £65 £13,104 201.3 yrs £-11,801
4 kW 3472 kWh 2604 kWh 868 kWh £0 £87 £87 £15,138 174.4 yrs £-13,402
5 kW 4340 kWh 3255 kWh 1085 kWh £0 £109 £109 £17,173 158.3 yrs £-15,002
6 kW 5208 kWh 3906 kWh 1302 kWh £0 £130 £130 £19,207 147.5 yrs £-16,603
7 kW 6077 kWh 4557 kWh 1519 kWh £0 £152 £152 £21,242 139.8 yrs £-18,203
8 kW 6945 kWh 5208 kWh 1736 kWh £0 £174 £174 £23,276 134.1 yrs £-19,804

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: £100, Upfront: £19,623, Break-even: 196.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1736 kWh 1337 kWh 399 kWh £0 £40 £40 £13,519 338.6 yrs £-12,720
3 kW 2604 kWh 2005 kWh 599 kWh £0 £60 £60 £15,554 259.7 yrs £-14,356
4 kW 3472 kWh 2674 kWh 799 kWh £0 £80 £80 £17,588 220.2 yrs £-15,991
5 kW 4340 kWh 3342 kWh 998 kWh £0 £100 £100 £19,623 196.6 yrs £-17,626
6 kW 5208 kWh 4011 kWh 1198 kWh £0 £120 £120 £21,657 180.8 yrs £-19,261
7 kW 6077 kWh 4679 kWh 1398 kWh £0 £140 £140 £23,692 169.5 yrs £-20,896
8 kW 6945 kWh 5347 kWh 1597 kWh £0 £160 £160 £25,726 161.1 yrs £-22,532

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
0.00p/kWh
Daily Fixed Charge
0.00p/day
Local Sunshine
868kWh/kW
A 1 kW system generates ~868 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

Causeway Coast and Glens (47%)|Mid and East Antrim (43%)|Mid Ulster (10%)

Areas Covered

Carnlough and Glenarm, Portglenone, Lurigethan, Clogh Mills, Dunloy, Rasharkin, Valley, Glenravel + 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 Northern Ireland

BT43 (Mid and East Antrim)
≈11.3 km away
Local sunshine: ~838 kWh/kWp · -3% vs BT44
BT42 (Mid and East Antrim)
≈13.3 km away
Local sunshine: ~838 kWh/kWp · -3% vs BT44
BT53 (Causeway Coast and Glens)
≈15.6 km away
Local sunshine: ~842 kWh/kWp · -3% vs BT44
BT46 (Mid Ulster)
≈24.6 km away
Local sunshine: ~852 kWh/kWp · -2% vs BT44
BT51 (Causeway Coast and Glens)
≈25.8 km away
Local sunshine: ~860 kWh/kWp · -1% vs BT44
BT54 (Causeway Coast and Glens)
≈26.3 km away
Local sunshine: ~860 kWh/kWp · -1% vs BT44

Similar sunshine across the UK

CA18 (Cumberland)
~868 kWh/kWp · -0% vs BT44
EH49 (West Lothian)
~868 kWh/kWp · -0% vs BT44
M16 (Trafford)
~868 kWh/kWp · +0% vs BT44