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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in BT74 (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
40.6 years
After this, it's pure profit
Upfront Cost
£12,207
What you pay to get started
Annual Benefit
£301
What you save every year
Profit Over 25 Years
£-4,689
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 835 kWh/kW — 155 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 835 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)
835 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: £251, Upfront: £10,173, Break-even: 40.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1671 kWh 668 kWh 1002 kWh £0 £100 £100 £4,069 40.6 yrs £-2,064
3 kW 2506 kWh 1002 kWh 1504 kWh £0 £150 £150 £6,104 40.6 yrs £-3,096
4 kW 3341 kWh 1336 kWh 2005 kWh £0 £200 £200 £8,138 40.6 yrs £-4,129
5 kW 4177 kWh 1671 kWh 2506 kWh £0 £251 £251 £10,173 40.6 yrs £-5,161
6 kW 5012 kWh 2005 kWh 3007 kWh £0 £301 £301 £12,207 40.6 yrs £-6,193
7 kW 5847 kWh 2339 kWh 3508 kWh £0 £351 £351 £14,242 40.6 yrs £-7,225
8 kW 6682 kWh 2673 kWh 4009 kWh £0 £401 £401 £16,276 40.6 yrs £-8,257

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: £167, Upfront: £12,273, Break-even: 73.5 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1671 kWh 1002 kWh 668 kWh £0 £67 £67 £6,169 92.3 yrs £-4,833
3 kW 2506 kWh 1504 kWh 1002 kWh £0 £100 £100 £8,204 81.8 yrs £-6,199
4 kW 3341 kWh 2005 kWh 1336 kWh £0 £134 £134 £10,238 76.6 yrs £-7,565
5 kW 4177 kWh 2506 kWh 1671 kWh £0 £167 £167 £12,273 73.5 yrs £-8,931
6 kW 5012 kWh 3007 kWh 2005 kWh £0 £200 £200 £14,307 71.4 yrs £-10,298
7 kW 5847 kWh 3508 kWh 2339 kWh £0 £234 £234 £16,342 69.9 yrs £-11,664
8 kW 6682 kWh 4009 kWh 2673 kWh £0 £267 £267 £18,376 68.7 yrs £-13,030

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: 109.1 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1671 kWh 1169 kWh 501 kWh £0 £50 £50 £7,569 151.0 yrs £-6,567
3 kW 2506 kWh 1754 kWh 752 kWh £0 £75 £75 £9,604 127.7 yrs £-8,100
4 kW 3341 kWh 2339 kWh 1002 kWh £0 £100 £100 £11,638 116.1 yrs £-9,633
5 kW 4177 kWh 2924 kWh 1253 kWh £0 £125 £125 £13,673 109.1 yrs £-11,167
6 kW 5012 kWh 3508 kWh 1504 kWh £0 £150 £150 £15,707 104.5 yrs £-12,700
7 kW 5847 kWh 4093 kWh 1754 kWh £0 £175 £175 £17,742 101.1 yrs £-14,233
8 kW 6682 kWh 4678 kWh 2005 kWh £0 £200 £200 £19,776 98.6 yrs £-15,767

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: £113, Upfront: £15,423, Break-even: 136.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1671 kWh 1220 kWh 451 kWh £0 £45 £45 £9,319 206.6 yrs £-8,417
3 kW 2506 kWh 1829 kWh 677 kWh £0 £68 £68 £11,354 167.8 yrs £-10,000
4 kW 3341 kWh 2439 kWh 902 kWh £0 £90 £90 £13,388 148.4 yrs £-11,584
5 kW 4177 kWh 3049 kWh 1128 kWh £0 £113 £113 £15,423 136.8 yrs £-13,167
6 kW 5012 kWh 3659 kWh 1353 kWh £0 £135 £135 £17,457 129.0 yrs £-14,751
7 kW 5847 kWh 4268 kWh 1579 kWh £0 £158 £158 £19,492 123.5 yrs £-16,334
8 kW 6682 kWh 4878 kWh 1804 kWh £0 £180 £180 £21,526 119.3 yrs £-17,918

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: 164.5 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1671 kWh 1253 kWh 418 kWh £0 £42 £42 £11,069 265.0 yrs £-10,234
3 kW 2506 kWh 1879 kWh 626 kWh £0 £63 £63 £13,104 209.2 yrs £-11,851
4 kW 3341 kWh 2506 kWh 835 kWh £0 £84 £84 £15,138 181.2 yrs £-13,467
5 kW 4177 kWh 3132 kWh 1044 kWh £0 £104 £104 £17,173 164.5 yrs £-15,084
6 kW 5012 kWh 3759 kWh 1253 kWh £0 £125 £125 £19,207 153.3 yrs £-16,701
7 kW 5847 kWh 4385 kWh 1462 kWh £0 £146 £146 £21,242 145.3 yrs £-18,318
8 kW 6682 kWh 5012 kWh 1671 kWh £0 £167 £167 £23,276 139.3 yrs £-19,935

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: 204.3 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1671 kWh 1286 kWh 384 kWh £0 £38 £38 £13,519 351.8 yrs £-12,751
3 kW 2506 kWh 1930 kWh 576 kWh £0 £58 £58 £15,554 269.9 yrs £-14,401
4 kW 3341 kWh 2573 kWh 768 kWh £0 £77 £77 £17,588 228.9 yrs £-16,051
5 kW 4177 kWh 3216 kWh 961 kWh £0 £96 £96 £19,623 204.3 yrs £-17,701
6 kW 5012 kWh 3859 kWh 1153 kWh £0 £115 £115 £21,657 187.9 yrs £-19,352
7 kW 5847 kWh 4502 kWh 1345 kWh £0 £134 £134 £23,692 176.2 yrs £-21,002
8 kW 6682 kWh 5146 kWh 1537 kWh £0 £154 £154 £25,726 167.4 yrs £-22,652

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
835kWh/kW
A 1 kW system generates ~835 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 (100%)

Areas Covered

Boho, Cleenish and Letterbreen, Portora, Castlecoole, Erne, Lisbellaw, Rossorry, Lisnarrick + 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

BT94 (Fermanagh and Omagh)
≈7.2 km away
Local sunshine: ~835 kWh/kWp · -0% vs BT74
BT92 (Fermanagh and Omagh)
≈18.3 km away
Local sunshine: ~843 kWh/kWp · +1% vs BT74
BT93 (Fermanagh and Omagh)
≈18.7 km away
Local sunshine: ~829 kWh/kWp · -1% vs BT74
BT75 (Mid Ulster)
≈21.3 km away
Local sunshine: ~824 kWh/kWp · -1% vs BT74
BT76 (Mid Ulster)
≈30.0 km away
Local sunshine: ~843 kWh/kWp · +1% vs BT74
BT78 (Fermanagh and Omagh)
≈32.9 km away
Local sunshine: ~832 kWh/kWp · -0% vs BT74

Similar sunshine across the UK

G81 (West Dunbartonshire)
~835 kWh/kWp · -0% vs BT74
PA4 (Renfrewshire)
~835 kWh/kWp · -0% vs BT74
BB4 (Rossendale)
~836 kWh/kWp · +0% vs BT74