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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in BT49 (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
40.1 years
After this, it's pure profit
Upfront Cost
£12,207
What you pay to get started
Annual Benefit
£304
What you save every year
Profit Over 25 Years
£-4,595
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 846 kWh/kW — 145 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 846 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)
846 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: £254, Upfront: £10,173, Break-even: 40.1 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1692 kWh 677 kWh 1015 kWh £0 £101 £101 £4,069 40.1 yrs £-2,039
3 kW 2537 kWh 1015 kWh 1522 kWh £0 £152 £152 £6,104 40.1 yrs £-3,059
4 kW 3383 kWh 1353 kWh 2030 kWh £0 £203 £203 £8,138 40.1 yrs £-4,078
5 kW 4229 kWh 1692 kWh 2537 kWh £0 £254 £254 £10,173 40.1 yrs £-5,098
6 kW 5075 kWh 2030 kWh 3045 kWh £0 £304 £304 £12,207 40.1 yrs £-6,117
7 kW 5921 kWh 2368 kWh 3552 kWh £0 £355 £355 £14,242 40.1 yrs £-7,137
8 kW 6766 kWh 2707 kWh 4060 kWh £0 £406 £406 £16,276 40.1 yrs £-8,156

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: £169, Upfront: £12,273, Break-even: 72.5 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1692 kWh 1015 kWh 677 kWh £0 £68 £68 £6,169 91.2 yrs £-4,816
3 kW 2537 kWh 1522 kWh 1015 kWh £0 £101 £101 £8,204 80.8 yrs £-6,174
4 kW 3383 kWh 2030 kWh 1353 kWh £0 £135 £135 £10,238 75.7 yrs £-7,531
5 kW 4229 kWh 2537 kWh 1692 kWh £0 £169 £169 £12,273 72.5 yrs £-8,889
6 kW 5075 kWh 3045 kWh 2030 kWh £0 £203 £203 £14,307 70.5 yrs £-10,247
7 kW 5921 kWh 3552 kWh 2368 kWh £0 £237 £237 £16,342 69.0 yrs £-11,605
8 kW 6766 kWh 4060 kWh 2707 kWh £0 £271 £271 £18,376 67.9 yrs £-12,963

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: £127, Upfront: £13,673, Break-even: 107.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1692 kWh 1184 kWh 507 kWh £0 £51 £51 £7,569 149.1 yrs £-6,554
3 kW 2537 kWh 1776 kWh 761 kWh £0 £76 £76 £9,604 126.2 yrs £-8,081
4 kW 3383 kWh 2368 kWh 1015 kWh £0 £101 £101 £11,638 114.7 yrs £-9,608
5 kW 4229 kWh 2960 kWh 1269 kWh £0 £127 £127 £13,673 107.8 yrs £-11,135
6 kW 5075 kWh 3552 kWh 1522 kWh £0 £152 £152 £15,707 103.2 yrs £-12,662
7 kW 5921 kWh 4144 kWh 1776 kWh £0 £178 £178 £17,742 99.9 yrs £-14,189
8 kW 6766 kWh 4737 kWh 2030 kWh £0 £203 £203 £19,776 97.4 yrs £-15,716

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: £114, Upfront: £15,423, Break-even: 135.1 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1692 kWh 1235 kWh 457 kWh £0 £46 £46 £9,319 204.0 yrs £-8,406
3 kW 2537 kWh 1852 kWh 685 kWh £0 £69 £69 £11,354 165.7 yrs £-9,983
4 kW 3383 kWh 2470 kWh 913 kWh £0 £91 £91 £13,388 146.6 yrs £-11,561
5 kW 4229 kWh 3087 kWh 1142 kWh £0 £114 £114 £15,423 135.1 yrs £-13,139
6 kW 5075 kWh 3705 kWh 1370 kWh £0 £137 £137 £17,457 127.4 yrs £-14,717
7 kW 5921 kWh 4322 kWh 1599 kWh £0 £160 £160 £19,492 121.9 yrs £-16,294
8 kW 6766 kWh 4940 kWh 1827 kWh £0 £183 £183 £21,526 117.8 yrs £-17,872

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: £106, Upfront: £17,173, Break-even: 162.4 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1692 kWh 1269 kWh 423 kWh £0 £42 £42 £11,069 261.7 yrs £-10,223
3 kW 2537 kWh 1903 kWh 634 kWh £0 £63 £63 £13,104 206.6 yrs £-11,835
4 kW 3383 kWh 2537 kWh 846 kWh £0 £85 £85 £15,138 179.0 yrs £-13,446
5 kW 4229 kWh 3172 kWh 1057 kWh £0 £106 £106 £17,173 162.4 yrs £-15,058
6 kW 5075 kWh 3806 kWh 1269 kWh £0 £127 £127 £19,207 151.4 yrs £-16,670
7 kW 5921 kWh 4441 kWh 1480 kWh £0 £148 £148 £21,242 143.5 yrs £-18,281
8 kW 6766 kWh 5075 kWh 1692 kWh £0 £169 £169 £23,276 137.6 yrs £-19,893

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: £97, Upfront: £19,623, Break-even: 201.7 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1692 kWh 1303 kWh 389 kWh £0 £39 £39 £13,519 347.5 yrs £-12,741
3 kW 2537 kWh 1954 kWh 584 kWh £0 £58 £58 £15,554 266.5 yrs £-14,386
4 kW 3383 kWh 2605 kWh 778 kWh £0 £78 £78 £17,588 226.0 yrs £-16,032
5 kW 4229 kWh 3256 kWh 973 kWh £0 £97 £97 £19,623 201.7 yrs £-17,677
6 kW 5075 kWh 3908 kWh 1167 kWh £0 £117 £117 £21,657 185.5 yrs £-19,323
7 kW 5921 kWh 4559 kWh 1362 kWh £0 £136 £136 £23,692 174.0 yrs £-20,968
8 kW 6766 kWh 5210 kWh 1556 kWh £0 £156 £156 £25,726 165.3 yrs £-22,613

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
846kWh/kW
A 1 kW system generates ~846 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 (100%)

Areas Covered

Roeside, Magilligan, Drumsurn, Ballykelly, Coolessan, Greystone, Greysteel, Altahullion + 1 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

BT51 (Causeway Coast and Glens)
≈17.6 km away
Local sunshine: ~860 kWh/kWp · +2% vs BT49
BT52 (Causeway Coast and Glens)
≈20.6 km away
Local sunshine: ~861 kWh/kWp · +2% vs BT49
BT55 (Causeway Coast and Glens)
≈21.2 km away
Local sunshine: ~854 kWh/kWp · +1% vs BT49
BT47 (Derry City and Strabane)
≈22.2 km away
Local sunshine: ~806 kWh/kWp · -5% vs BT49
BT48 (Derry City and Strabane)
≈24.6 km away
Local sunshine: ~827 kWh/kWp · -2% vs BT49
BT56 (Causeway Coast and Glens)
≈25.2 km away
Local sunshine: ~849 kWh/kWp · +0% vs BT49

Similar sunshine across the UK

PA81 (Na h-Eileanan Siar)
~846 kWh/kWp · +0% vs BT49
LL38 (Gwynedd)
~846 kWh/kWp · -0% vs BT49
BB8 (Pendle)
~846 kWh/kWp · -0% vs BT49