Solar explained to clever people by people who are not trying to be clever

Solar Panels in BT53 (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).

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
40.2 years
After this, it's pure profit
Upfront Cost
£12,207
What you pay to get started
Annual Benefit
£303
What you save every year
Profit Over 25 Years
£-4,625
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

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 842 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)
842 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: £253, Upfront: £10,173, Break-even: 40.2 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1685 kWh 674 kWh 1011 kWh £0 £101 £101 £4,069 40.2 yrs £-2,047
3 kW 2527 kWh 1011 kWh 1516 kWh £0 £152 £152 £6,104 40.2 yrs £-3,071
4 kW 3370 kWh 1348 kWh 2022 kWh £0 £202 £202 £8,138 40.2 yrs £-4,094
5 kW 4212 kWh 1685 kWh 2527 kWh £0 £253 £253 £10,173 40.2 yrs £-5,118
6 kW 5055 kWh 2022 kWh 3033 kWh £0 £303 £303 £12,207 40.2 yrs £-6,141
7 kW 5897 kWh 2359 kWh 3538 kWh £0 £354 £354 £14,242 40.2 yrs £-7,165
8 kW 6740 kWh 2696 kWh 4044 kWh £0 £404 £404 £16,276 40.2 yrs £-8,188

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: £168, Upfront: £12,273, Break-even: 72.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1685 kWh 1011 kWh 674 kWh £0 £67 £67 £6,169 91.5 yrs £-4,821
3 kW 2527 kWh 1516 kWh 1011 kWh £0 £101 £101 £8,204 81.1 yrs £-6,182
4 kW 3370 kWh 2022 kWh 1348 kWh £0 £135 £135 £10,238 76.0 yrs £-7,542
5 kW 4212 kWh 2527 kWh 1685 kWh £0 £168 £168 £12,273 72.8 yrs £-8,903
6 kW 5055 kWh 3033 kWh 2022 kWh £0 £202 £202 £14,307 70.8 yrs £-10,263
7 kW 5897 kWh 3538 kWh 2359 kWh £0 £236 £236 £16,342 69.3 yrs £-11,624
8 kW 6740 kWh 4044 kWh 2696 kWh £0 £270 £270 £18,376 68.2 yrs £-12,984

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: £126, Upfront: £13,673, Break-even: 108.2 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1685 kWh 1179 kWh 505 kWh £0 £51 £51 £7,569 149.7 yrs £-6,558
3 kW 2527 kWh 1769 kWh 758 kWh £0 £76 £76 £9,604 126.7 yrs £-8,087
4 kW 3370 kWh 2359 kWh 1011 kWh £0 £101 £101 £11,638 115.1 yrs £-9,616
5 kW 4212 kWh 2949 kWh 1264 kWh £0 £126 £126 £13,673 108.2 yrs £-11,145
6 kW 5055 kWh 3538 kWh 1516 kWh £0 £152 £152 £15,707 103.6 yrs £-12,674
7 kW 5897 kWh 4128 kWh 1769 kWh £0 £177 £177 £17,742 100.3 yrs £-14,203
8 kW 6740 kWh 4718 kWh 2022 kWh £0 £202 £202 £19,776 97.8 yrs £-15,732

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: 135.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1685 kWh 1230 kWh 455 kWh £0 £45 £45 £9,319 204.8 yrs £-8,409
3 kW 2527 kWh 1845 kWh 682 kWh £0 £68 £68 £11,354 166.4 yrs £-9,989
4 kW 3370 kWh 2460 kWh 910 kWh £0 £91 £91 £13,388 147.1 yrs £-11,568
5 kW 4212 kWh 3075 kWh 1137 kWh £0 £114 £114 £15,423 135.6 yrs £-13,148
6 kW 5055 kWh 3690 kWh 1365 kWh £0 £136 £136 £17,457 127.9 yrs £-14,727
7 kW 5897 kWh 4305 kWh 1592 kWh £0 £159 £159 £19,492 122.4 yrs £-16,307
8 kW 6740 kWh 4920 kWh 1820 kWh £0 £182 £182 £21,526 118.3 yrs £-17,887

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: £105, Upfront: £17,173, Break-even: 163.1 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1685 kWh 1264 kWh 421 kWh £0 £42 £42 £11,069 262.8 yrs £-10,227
3 kW 2527 kWh 1896 kWh 632 kWh £0 £63 £63 £13,104 207.4 yrs £-11,840
4 kW 3370 kWh 2527 kWh 842 kWh £0 £84 £84 £15,138 179.7 yrs £-13,453
5 kW 4212 kWh 3159 kWh 1053 kWh £0 £105 £105 £17,173 163.1 yrs £-15,066
6 kW 5055 kWh 3791 kWh 1264 kWh £0 £126 £126 £19,207 152.0 yrs £-16,680
7 kW 5897 kWh 4423 kWh 1474 kWh £0 £147 £147 £21,242 144.1 yrs £-18,293
8 kW 6740 kWh 5055 kWh 1685 kWh £0 £168 £168 £23,276 138.1 yrs £-19,906

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: 202.5 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1685 kWh 1297 kWh 388 kWh £0 £39 £39 £13,519 348.8 yrs £-12,744
3 kW 2527 kWh 1946 kWh 581 kWh £0 £58 £58 £15,554 267.6 yrs £-14,391
4 kW 3370 kWh 2595 kWh 775 kWh £0 £78 £78 £17,588 226.9 yrs £-16,038
5 kW 4212 kWh 3244 kWh 969 kWh £0 £97 £97 £19,623 202.5 yrs £-17,685
6 kW 5055 kWh 3892 kWh 1163 kWh £0 £116 £116 £21,657 186.3 yrs £-19,332
7 kW 5897 kWh 4541 kWh 1356 kWh £0 £136 £136 £23,692 174.7 yrs £-20,979
8 kW 6740 kWh 5190 kWh 1550 kWh £0 £155 £155 £25,726 166.0 yrs £-22,626

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
842kWh/kW
A 1 kW system generates ~842 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

Ballymoney North, Dervock, Ballymoney East, Route, Loughguile and Stranocum, Ballymoney South, Rasharkin, Torr Head and Rathlin + 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.