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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in BT52 (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
39.4 years
After this, it's pure profit
Upfront Cost
£12,207
What you pay to get started
Annual Benefit
£310
What you save every year
Profit Over 25 Years
£-4,460
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 861 kWh/kW — 130 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 861 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)
861 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: £258, Upfront: £10,173, Break-even: 39.4 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1722 kWh 689 kWh 1033 kWh £0 £103 £103 £4,069 39.4 yrs £-2,003
3 kW 2582 kWh 1033 kWh 1549 kWh £0 £155 £155 £6,104 39.4 yrs £-3,005
4 kW 3443 kWh 1377 kWh 2066 kWh £0 £207 £207 £8,138 39.4 yrs £-4,006
5 kW 4304 kWh 1722 kWh 2582 kWh £0 £258 £258 £10,173 39.4 yrs £-5,008
6 kW 5165 kWh 2066 kWh 3099 kWh £0 £310 £310 £12,207 39.4 yrs £-6,010
7 kW 6025 kWh 2410 kWh 3615 kWh £0 £362 £362 £14,242 39.4 yrs £-7,011
8 kW 6886 kWh 2754 kWh 4132 kWh £0 £413 £413 £16,276 39.4 yrs £-8,013

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: £172, Upfront: £12,273, Break-even: 71.3 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1722 kWh 1033 kWh 689 kWh £0 £69 £69 £6,169 89.6 yrs £-4,792
3 kW 2582 kWh 1549 kWh 1033 kWh £0 £103 £103 £8,204 79.4 yrs £-6,138
4 kW 3443 kWh 2066 kWh 1377 kWh £0 £138 £138 £10,238 74.3 yrs £-7,484
5 kW 4304 kWh 2582 kWh 1722 kWh £0 £172 £172 £12,273 71.3 yrs £-8,829
6 kW 5165 kWh 3099 kWh 2066 kWh £0 £207 £207 £14,307 69.3 yrs £-10,175
7 kW 6025 kWh 3615 kWh 2410 kWh £0 £241 £241 £16,342 67.8 yrs £-11,521
8 kW 6886 kWh 4132 kWh 2754 kWh £0 £275 £275 £18,376 66.7 yrs £-12,867

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: £129, Upfront: £13,673, Break-even: 105.9 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1722 kWh 1205 kWh 516 kWh £0 £52 £52 £7,569 146.6 yrs £-6,536
3 kW 2582 kWh 1808 kWh 775 kWh £0 £77 £77 £9,604 124.0 yrs £-8,054
4 kW 3443 kWh 2410 kWh 1033 kWh £0 £103 £103 £11,638 112.7 yrs £-9,572
5 kW 4304 kWh 3013 kWh 1291 kWh £0 £129 £129 £13,673 105.9 yrs £-11,090
6 kW 5165 kWh 3615 kWh 1549 kWh £0 £155 £155 £15,707 101.4 yrs £-12,608
7 kW 6025 kWh 4218 kWh 1808 kWh £0 £181 £181 £17,742 98.1 yrs £-14,126
8 kW 6886 kWh 4820 kWh 2066 kWh £0 £207 £207 £19,776 95.7 yrs £-15,644

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: £116, Upfront: £15,423, Break-even: 132.7 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1722 kWh 1257 kWh 465 kWh £0 £46 £46 £9,319 200.5 yrs £-8,389
3 kW 2582 kWh 1885 kWh 697 kWh £0 £70 £70 £11,354 162.8 yrs £-9,959
4 kW 3443 kWh 2513 kWh 930 kWh £0 £93 £93 £13,388 144.0 yrs £-11,529
5 kW 4304 kWh 3142 kWh 1162 kWh £0 £116 £116 £15,423 132.7 yrs £-13,098
6 kW 5165 kWh 3770 kWh 1394 kWh £0 £139 £139 £17,457 125.2 yrs £-14,668
7 kW 6025 kWh 4399 kWh 1627 kWh £0 £163 £163 £19,492 119.8 yrs £-16,238
8 kW 6886 kWh 5027 kWh 1859 kWh £0 £186 £186 £21,526 115.8 yrs £-17,808

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: £108, Upfront: £17,173, Break-even: 159.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1722 kWh 1291 kWh 430 kWh £0 £43 £43 £11,069 257.2 yrs £-10,208
3 kW 2582 kWh 1937 kWh 646 kWh £0 £65 £65 £13,104 203.0 yrs £-11,812
4 kW 3443 kWh 2582 kWh 861 kWh £0 £86 £86 £15,138 175.9 yrs £-13,416
5 kW 4304 kWh 3228 kWh 1076 kWh £0 £108 £108 £17,173 159.6 yrs £-15,021
6 kW 5165 kWh 3873 kWh 1291 kWh £0 £129 £129 £19,207 148.8 yrs £-16,625
7 kW 6025 kWh 4519 kWh 1506 kWh £0 £151 £151 £21,242 141.0 yrs £-18,229
8 kW 6886 kWh 5165 kWh 1722 kWh £0 £172 £172 £23,276 135.2 yrs £-19,833

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: £99, Upfront: £19,623, Break-even: 198.2 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1722 kWh 1326 kWh 396 kWh £0 £40 £40 £13,519 341.4 yrs £-12,727
3 kW 2582 kWh 1988 kWh 594 kWh £0 £59 £59 £15,554 261.9 yrs £-14,366
4 kW 3443 kWh 2651 kWh 792 kWh £0 £79 £79 £17,588 222.1 yrs £-16,004
5 kW 4304 kWh 3314 kWh 990 kWh £0 £99 £99 £19,623 198.2 yrs £-17,643
6 kW 5165 kWh 3977 kWh 1188 kWh £0 £119 £119 £21,657 182.3 yrs £-19,281
7 kW 6025 kWh 4640 kWh 1386 kWh £0 £139 £139 £23,692 171.0 yrs £-20,920
8 kW 6886 kWh 5302 kWh 1584 kWh £0 £158 £158 £25,726 162.4 yrs £-22,558

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
861kWh/kW
A 1 kW system generates ~861 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

Mountsandel, University, Windy Hall, Quarry, Dundooan, Kilrea

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)
≈4.5 km away
Local sunshine: ~860 kWh/kWp · -0% vs BT52
BT55 (Causeway Coast and Glens)
≈6.1 km away
Local sunshine: ~854 kWh/kWp · -1% vs BT52
BT56 (Causeway Coast and Glens)
≈7.2 km away
Local sunshine: ~849 kWh/kWp · -1% vs BT52
BT57 (Causeway Coast and Glens)
≈11.8 km away
Local sunshine: ~866 kWh/kWp · +1% vs BT52
BT53 (Causeway Coast and Glens)
≈11.8 km away
Local sunshine: ~842 kWh/kWp · -2% vs BT52
BT49 (Causeway Coast and Glens)
≈20.6 km away
Local sunshine: ~846 kWh/kWp · -2% vs BT52

Similar sunshine across the UK

BL9 (Bury)
~861 kWh/kWp · -0% vs BT52
SK1 (Stockport)
~861 kWh/kWp · -0% vs BT52
HS8 (Na h-Eileanan Siar)
~861 kWh/kWp · -0% vs BT52