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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in BT78 (Fermanagh and Omagh)

See if solar pays off for you in Fermanagh and Omagh — 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
40.7 years
After this, it's pure profit
Upfront Cost
£12,207
What you pay to get started
Annual Benefit
£300
What you save every year
Profit Over 25 Years
£-4,718
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 832 kWh/kW — 158 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 832 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)
832 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: £250, Upfront: £10,173, Break-even: 40.7 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1664 kWh 666 kWh 999 kWh £0 £100 £100 £4,069 40.7 yrs £-2,072
3 kW 2497 kWh 999 kWh 1498 kWh £0 £150 £150 £6,104 40.7 yrs £-3,108
4 kW 3329 kWh 1331 kWh 1997 kWh £0 £200 £200 £8,138 40.7 yrs £-4,144
5 kW 4161 kWh 1664 kWh 2497 kWh £0 £250 £250 £10,173 40.7 yrs £-5,180
6 kW 4993 kWh 1997 kWh 2996 kWh £0 £300 £300 £12,207 40.7 yrs £-6,215
7 kW 5825 kWh 2330 kWh 3495 kWh £0 £350 £350 £14,242 40.7 yrs £-7,251
8 kW 6657 kWh 2663 kWh 3994 kWh £0 £399 £399 £16,276 40.7 yrs £-8,287

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: £166, Upfront: £12,273, Break-even: 73.7 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1664 kWh 999 kWh 666 kWh £0 £67 £67 £6,169 92.7 yrs £-4,838
3 kW 2497 kWh 1498 kWh 999 kWh £0 £100 £100 £8,204 82.1 yrs £-6,206
4 kW 3329 kWh 1997 kWh 1331 kWh £0 £133 £133 £10,238 76.9 yrs £-7,575
5 kW 4161 kWh 2497 kWh 1664 kWh £0 £166 £166 £12,273 73.7 yrs £-8,944
6 kW 4993 kWh 2996 kWh 1997 kWh £0 £200 £200 £14,307 71.6 yrs £-10,313
7 kW 5825 kWh 3495 kWh 2330 kWh £0 £233 £233 £16,342 70.1 yrs £-11,681
8 kW 6657 kWh 3994 kWh 2663 kWh £0 £266 £266 £18,376 69.0 yrs £-13,050

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: £125, Upfront: £13,673, Break-even: 109.5 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1664 kWh 1165 kWh 499 kWh £0 £50 £50 £7,569 151.6 yrs £-6,570
3 kW 2497 kWh 1748 kWh 749 kWh £0 £75 £75 £9,604 128.2 yrs £-8,106
4 kW 3329 kWh 2330 kWh 999 kWh £0 £100 £100 £11,638 116.5 yrs £-9,641
5 kW 4161 kWh 2913 kWh 1248 kWh £0 £125 £125 £13,673 109.5 yrs £-11,176
6 kW 4993 kWh 3495 kWh 1498 kWh £0 £150 £150 £15,707 104.9 yrs £-12,711
7 kW 5825 kWh 4078 kWh 1748 kWh £0 £175 £175 £17,742 101.5 yrs £-14,246
8 kW 6657 kWh 4660 kWh 1997 kWh £0 £200 £200 £19,776 99.0 yrs £-15,782

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: £112, Upfront: £15,423, Break-even: 137.3 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1664 kWh 1215 kWh 449 kWh £0 £45 £45 £9,319 207.4 yrs £-8,420
3 kW 2497 kWh 1822 kWh 674 kWh £0 £67 £67 £11,354 168.4 yrs £-10,005
4 kW 3329 kWh 2430 kWh 899 kWh £0 £90 £90 £13,388 149.0 yrs £-11,591
5 kW 4161 kWh 3037 kWh 1123 kWh £0 £112 £112 £15,423 137.3 yrs £-13,176
6 kW 4993 kWh 3645 kWh 1348 kWh £0 £135 £135 £17,457 129.5 yrs £-14,761
7 kW 5825 kWh 4252 kWh 1573 kWh £0 £157 £157 £19,492 123.9 yrs £-16,346
8 kW 6657 kWh 4860 kWh 1797 kWh £0 £180 £180 £21,526 119.8 yrs £-17,931

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: £104, Upfront: £17,173, Break-even: 165.1 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1664 kWh 1248 kWh 416 kWh £0 £42 £42 £11,069 266.0 yrs £-10,237
3 kW 2497 kWh 1872 kWh 624 kWh £0 £62 £62 £13,104 209.9 yrs £-11,855
4 kW 3329 kWh 2497 kWh 832 kWh £0 £83 £83 £15,138 181.9 yrs £-13,474
5 kW 4161 kWh 3121 kWh 1040 kWh £0 £104 £104 £17,173 165.1 yrs £-15,092
6 kW 4993 kWh 3745 kWh 1248 kWh £0 £125 £125 £19,207 153.9 yrs £-16,711
7 kW 5825 kWh 4369 kWh 1456 kWh £0 £146 £146 £21,242 145.9 yrs £-18,329
8 kW 6657 kWh 4993 kWh 1664 kWh £0 £166 £166 £23,276 139.9 yrs £-19,947

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: £96, Upfront: £19,623, Break-even: 205.0 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1664 kWh 1282 kWh 383 kWh £0 £38 £38 £13,519 353.2 yrs £-12,753
3 kW 2497 kWh 1922 kWh 574 kWh £0 £57 £57 £15,554 270.9 yrs £-14,405
4 kW 3329 kWh 2563 kWh 766 kWh £0 £77 £77 £17,588 229.7 yrs £-16,057
5 kW 4161 kWh 3204 kWh 957 kWh £0 £96 £96 £19,623 205.0 yrs £-17,709
6 kW 4993 kWh 3845 kWh 1148 kWh £0 £115 £115 £21,657 188.6 yrs £-19,360
7 kW 5825 kWh 4485 kWh 1340 kWh £0 £134 £134 £23,692 176.8 yrs £-21,012
8 kW 6657 kWh 5126 kWh 1531 kWh £0 £153 £153 £25,726 168.0 yrs £-22,664

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
832kWh/kW
A 1 kW system generates ~832 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

Fermanagh and Omagh (87%)|Derry City and Strabane (12%)|Mid Ulster (1%)

Areas Covered

Fairy Water, Fintona, Trillick, Newtownstewart, Dergmoney, Drumquin, Dromore, Newtownsaville + 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

BT79 (Fermanagh and Omagh)
≈7.6 km away
Local sunshine: ~827 kWh/kWp · -1% vs BT78
BT81 (Derry City and Strabane)
≈20.6 km away
Local sunshine: ~837 kWh/kWp · +1% vs BT78
BT76 (Mid Ulster)
≈21.6 km away
Local sunshine: ~843 kWh/kWp · +1% vs BT78
BT77 (Mid Ulster)
≈22.7 km away
Local sunshine: ~855 kWh/kWp · +3% vs BT78
BT75 (Mid Ulster)
≈23.6 km away
Local sunshine: ~824 kWh/kWp · -1% vs BT78
BT82 (Derry City and Strabane)
≈27.1 km away
Local sunshine: ~795 kWh/kWp · -4% vs BT78

Similar sunshine across the UK

G61 (East Dunbartonshire)
~832 kWh/kWp · +0% vs BT78
KW2 (Highland)
~832 kWh/kWp · +0% vs BT78
PA10 (Renfrewshire)
~832 kWh/kWp · -0% vs BT78