Independent solar numbers for your postcode using official UK data
Home Regions Guides Compare quotes Solar assistant
Insights
Big Roof Britain Solar Payback Index Standing Charge Drag Roof Direction Penalty Winter Solar Reality Seasonal Solar Output

Solar panel cost in Belfast (BT12)

See realistic solar installation costs, savings and payback for BT12 (Belfast) in under a minute using official UK data. Start with the calculator, then get a no-obligation quote from an MCS-certified installer. You can also ask the SolarByPostcode assistant to sanity-check your roof, bills and plans.

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
30.4 years
After this, it's pure profit
Upfront Cost
£9,767
What you pay to get started
Annual Benefit
£321
What you save every year
Profit Over 25 Years
£-1,733
After paying itself off, you're this much ahead

Ready to Get Started?

Get your free quote from Blue Ape Renewables. They'll connect you with MCS-certified installers in your area and handle all the paperwork.

Get Solar Quote →
4.8★ Trustpilot • Octopus Energy trusted partner • MCS certified • No obligation
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: The official cost per kW is lower above 4 kW, so a 5–6 kW system can pay back a little faster than a 3–4 kW system on otherwise identical assumptions.
  • 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

Panel costs: Uses March 2026 TIC mean installation costs: £1,827/kW up to 4 kW and £1,628/kW above 4 kW.

Other costs: Battery prices are modelled at £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 893 kWh/kW — 98 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 893 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)
893 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: £268, Upfront: £8,139, Break-even: 30.4 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1785 kWh 714 kWh 1071 kWh £0 £107 £107 £3,256 30.4 yrs £-1,113
3 kW 2678 kWh 1071 kWh 1607 kWh £0 £161 £161 £4,883 30.4 yrs £-1,670
4 kW 3571 kWh 1428 kWh 2142 kWh £0 £214 £214 £6,511 30.4 yrs £-2,226
5 kW 4463 kWh 1785 kWh 2678 kWh £0 £268 £268 £8,139 30.4 yrs £-2,783
6 kW 5356 kWh 2142 kWh 3214 kWh £0 £321 £321 £9,767 30.4 yrs £-3,340
7 kW 6248 kWh 2499 kWh 3749 kWh £0 £375 £375 £11,394 30.4 yrs £-3,896
8 kW 7141 kWh 2856 kWh 4285 kWh £0 £428 £428 £13,022 30.4 yrs £-4,453

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,628, battery £/kWh = 700.

3 kWh battery 5 kW example → Annual benefit: £179, Upfront: £10,239, Break-even: 57.4 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1785 kWh 1071 kWh 714 kWh £0 £71 £71 £5,356 75.0 yrs £-3,927
3 kW 2678 kWh 1607 kWh 1071 kWh £0 £107 £107 £6,983 65.2 yrs £-4,841
4 kW 3571 kWh 2142 kWh 1428 kWh £0 £143 £143 £8,611 60.3 yrs £-5,755
5 kW 4463 kWh 2678 kWh 1785 kWh £0 £179 £179 £10,239 57.4 yrs £-6,668
6 kW 5356 kWh 3214 kWh 2142 kWh £0 £214 £214 £11,867 55.4 yrs £-7,582
7 kW 6248 kWh 3749 kWh 2499 kWh £0 £250 £250 £13,494 54.0 yrs £-8,496
8 kW 7141 kWh 4285 kWh 2856 kWh £0 £286 £286 £15,122 52.9 yrs £-9,409

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,628, battery £/kWh = 700.

5 kWh battery 5 kW example → Annual benefit: £134, Upfront: £11,639, Break-even: 86.9 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1785 kWh 1250 kWh 536 kWh £0 £54 £54 £6,756 126.1 yrs £-5,684
3 kW 2678 kWh 1875 kWh 803 kWh £0 £80 £80 £8,383 104.4 yrs £-6,777
4 kW 3571 kWh 2499 kWh 1071 kWh £0 £107 £107 £10,011 93.5 yrs £-7,869
5 kW 4463 kWh 3124 kWh 1339 kWh £0 £134 £134 £11,639 86.9 yrs £-8,961
6 kW 5356 kWh 3749 kWh 1607 kWh £0 £161 £161 £13,267 82.6 yrs £-10,053
7 kW 6248 kWh 4374 kWh 1875 kWh £0 £187 £187 £14,894 79.5 yrs £-11,145
8 kW 7141 kWh 4999 kWh 2142 kWh £0 £214 £214 £16,522 77.1 yrs £-12,237

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,628, battery £/kWh = 700.

7.5 kWh battery 5 kW example → Annual benefit: £121, Upfront: £13,389, Break-even: 111.1 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1785 kWh 1303 kWh 482 kWh £0 £48 £48 £8,506 176.5 yrs £-7,541
3 kW 2678 kWh 1955 kWh 723 kWh £0 £72 £72 £10,133 140.1 yrs £-8,687
4 kW 3571 kWh 2607 kWh 964 kWh £0 £96 £96 £11,761 122.0 yrs £-9,833
5 kW 4463 kWh 3258 kWh 1205 kWh £0 £121 £121 £13,389 111.1 yrs £-10,979
6 kW 5356 kWh 3910 kWh 1446 kWh £0 £145 £145 £15,017 103.8 yrs £-12,124
7 kW 6248 kWh 4561 kWh 1687 kWh £0 £169 £169 £16,644 98.7 yrs £-13,270
8 kW 7141 kWh 5213 kWh 1928 kWh £0 £193 £193 £18,272 94.8 yrs £-14,416

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,628, battery £/kWh = 700.

10 kWh battery 5 kW example → Annual benefit: £112, Upfront: £15,139, Break-even: 135.7 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1785 kWh 1339 kWh 446 kWh £0 £45 £45 £10,256 229.8 yrs £-9,363
3 kW 2678 kWh 2008 kWh 669 kWh £0 £67 £67 £11,883 177.5 yrs £-10,544
4 kW 3571 kWh 2678 kWh 893 kWh £0 £89 £89 £13,511 151.4 yrs £-11,726
5 kW 4463 kWh 3347 kWh 1116 kWh £0 £112 £112 £15,139 135.7 yrs £-12,907
6 kW 5356 kWh 4017 kWh 1339 kWh £0 £134 £134 £16,767 125.2 yrs £-14,089
7 kW 6248 kWh 4686 kWh 1562 kWh £0 £156 £156 £18,394 117.8 yrs £-15,270
8 kW 7141 kWh 5356 kWh 1785 kWh £0 £179 £179 £20,022 112.2 yrs £-16,452

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,628, battery £/kWh = 700.

13.5 kWh battery 5 kW example → Annual benefit: £103, Upfront: £17,589, Break-even: 171.3 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1785 kWh 1375 kWh 411 kWh £0 £41 £41 £12,706 309.4 yrs £-11,884
3 kW 2678 kWh 2062 kWh 616 kWh £0 £62 £62 £14,333 232.7 yrs £-13,101
4 kW 3571 kWh 2749 kWh 821 kWh £0 £82 £82 £15,961 194.4 yrs £-14,319
5 kW 4463 kWh 3437 kWh 1027 kWh £0 £103 £103 £17,589 171.3 yrs £-15,536
6 kW 5356 kWh 4124 kWh 1232 kWh £0 £123 £123 £19,217 156.0 yrs £-16,753
7 kW 6248 kWh 4811 kWh 1437 kWh £0 £144 £144 £20,844 145.0 yrs £-17,970
8 kW 7141 kWh 5499 kWh 1642 kWh £0 £164 £164 £22,472 136.8 yrs £-19,187

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,628, 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.

Before you request quotes in Belfast

Use the numbers above to sanity-check installer quotes. The main things to compare are system size, battery assumptions, payback claims, MCS certification, DNO paperwork and export assumptions.

Compare solar quotes before you sign

Check what MCS certification means

Understand DNO, G98 and G99 export limits

New quote check

Want a quote sanity check for BT12?

Share the first part of your postcode and a few basics. We’ll help you check whether system size, battery, export and paperwork assumptions look sensible before you commit to installer conversations.

This is a practical sanity-check request, not an instant quote promise. The Blue Ape quote route above remains available if you already want installer introductions.

Request a quote sanity check →

Insights for BT12

Figures below are tailored to BT12 — click through for full league tables.

Aspect Penalty View ranking →
East −21.0% West −20.4%
Typical output loss versus a south-facing roof (lower is better)

Seasonal solar output in BT12

Monthly generation per kilowatt of solar panels

kWh 29 Jan 46 Feb 78 Mar 105 Apr 118 May 113 Jun 107 Jul 98 Aug 79 Sep 57 Oct 37 Nov 26 Dec
Best month Worst month Winter (Dec–Feb) Other months

Winter output: 45.2% of an average month (Dec–Feb)

Best / worst month: May / Dec

These figures show output per kilowatt (kW) of panels installed. In winter, a 1 kW system here produces about 34 kWh per month; the average month produces around 74 kWh. So a typical 4 kW home system would generate roughly 135 kWh in winter, or 298 kWh in an average month.

Your Area at a Glance

Your Electricity Rate
0.00p/kWh
Daily Fixed Charge
0.00p/day
Local Sunshine
893kWh/kW
A 1 kW system generates ~893 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

Belfast (100%)

Areas Covered

Blackstaff, Falls, Beechmount, Clonard, Ballymurphy, Turf Lodge, Central, Ballygomartin + 4 more

Data Sources & Assumptions

Solar yield: PVGIS (EU Joint Research Centre), January 2025 data

Electricity rates: Ofgem price cap,

Installation costs: DESNZ/MCS data, March 2026 (TIC)

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

BT13 (Belfast)
≈1.3 km away
Local sunshine: ~886 kWh/kWp · -1% vs BT12
BT2 (Belfast)
≈1.5 km away
Local sunshine: ~893 kWh/kWp · +0% vs BT12
BT1 (Belfast)
≈1.8 km away
Local sunshine: ~885 kWh/kWp · -1% vs BT12
BT7 (Belfast)
≈2.1 km away
Local sunshine: ~893 kWh/kWp · +0% vs BT12
BT99 (Belfast)
≈2.3 km away
Local sunshine: ~885 kWh/kWp · -1% vs BT12
BT9 (Belfast)
≈2.4 km away
Local sunshine: ~893 kWh/kWp · +0% vs BT12

Similar sunshine across the UK

AB1 (Aberdeen City)
~893 kWh/kWp · -0% vs BT12
AB13 (Aberdeen City)
~893 kWh/kWp · -0% vs BT12
EH21 (East Lothian)
~893 kWh/kWp · +0% vs BT12