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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in BT43 (Mid and East Antrim)

See if solar pays off for you in Mid and East Antrim — 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
40.5 years
After this, it's pure profit
Upfront Cost
£12,207
What you pay to get started
Annual Benefit
£302
What you save every year
Profit Over 25 Years
£-4,663
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 838 kWh/kW — 152 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 838 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)
838 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: 40.5 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1677 kWh 671 kWh 1006 kWh £0 £101 £101 £4,069 40.5 yrs £-2,057
3 kW 2515 kWh 1006 kWh 1509 kWh £0 £151 £151 £6,104 40.5 yrs £-3,086
4 kW 3353 kWh 1341 kWh 2012 kWh £0 £201 £201 £8,138 40.5 yrs £-4,114
5 kW 4191 kWh 1677 kWh 2515 kWh £0 £251 £251 £10,173 40.5 yrs £-5,143
6 kW 5030 kWh 2012 kWh 3018 kWh £0 £302 £302 £12,207 40.5 yrs £-6,171
7 kW 5868 kWh 2347 kWh 3521 kWh £0 £352 £352 £14,242 40.5 yrs £-7,200
8 kW 6706 kWh 2682 kWh 4024 kWh £0 £402 £402 £16,276 40.5 yrs £-8,229

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: 73.2 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1677 kWh 1006 kWh 671 kWh £0 £67 £67 £6,169 92.0 yrs £-4,828
3 kW 2515 kWh 1509 kWh 1006 kWh £0 £101 £101 £8,204 81.6 yrs £-6,192
4 kW 3353 kWh 2012 kWh 1341 kWh £0 £134 £134 £10,238 76.3 yrs £-7,556
5 kW 4191 kWh 2515 kWh 1677 kWh £0 £168 £168 £12,273 73.2 yrs £-8,919
6 kW 5030 kWh 3018 kWh 2012 kWh £0 £201 £201 £14,307 71.1 yrs £-10,283
7 kW 5868 kWh 3521 kWh 2347 kWh £0 £235 £235 £16,342 69.6 yrs £-11,647
8 kW 6706 kWh 4024 kWh 2682 kWh £0 £268 £268 £18,376 68.5 yrs £-13,011

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: 108.7 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1677 kWh 1174 kWh 503 kWh £0 £50 £50 £7,569 150.5 yrs £-6,563
3 kW 2515 kWh 1760 kWh 754 kWh £0 £75 £75 £9,604 127.3 yrs £-8,095
4 kW 3353 kWh 2347 kWh 1006 kWh £0 £101 £101 £11,638 115.7 yrs £-9,626
5 kW 4191 kWh 2934 kWh 1257 kWh £0 £126 £126 £13,673 108.7 yrs £-11,158
6 kW 5030 kWh 3521 kWh 1509 kWh £0 £151 £151 £15,707 104.1 yrs £-12,689
7 kW 5868 kWh 4108 kWh 1760 kWh £0 £176 £176 £17,742 100.8 yrs £-14,221
8 kW 6706 kWh 4694 kWh 2012 kWh £0 £201 £201 £19,776 98.3 yrs £-15,752

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: 136.3 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1677 kWh 1224 kWh 453 kWh £0 £45 £45 £9,319 205.9 yrs £-8,414
3 kW 2515 kWh 1836 kWh 679 kWh £0 £68 £68 £11,354 167.2 yrs £-9,996
4 kW 3353 kWh 2448 kWh 905 kWh £0 £91 £91 £13,388 147.9 yrs £-11,577
5 kW 4191 kWh 3060 kWh 1132 kWh £0 £113 £113 £15,423 136.3 yrs £-13,159
6 kW 5030 kWh 3672 kWh 1358 kWh £0 £136 £136 £17,457 128.5 yrs £-14,741
7 kW 5868 kWh 4284 kWh 1584 kWh £0 £158 £158 £19,492 123.0 yrs £-16,323
8 kW 6706 kWh 4896 kWh 1811 kWh £0 £181 £181 £21,526 118.9 yrs £-17,905

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: 163.9 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1677 kWh 1257 kWh 419 kWh £0 £42 £42 £11,069 264.1 yrs £-10,231
3 kW 2515 kWh 1886 kWh 629 kWh £0 £63 £63 £13,104 208.4 yrs £-11,846
4 kW 3353 kWh 2515 kWh 838 kWh £0 £84 £84 £15,138 180.6 yrs £-13,461
5 kW 4191 kWh 3144 kWh 1048 kWh £0 £105 £105 £17,173 163.9 yrs £-15,077
6 kW 5030 kWh 3772 kWh 1257 kWh £0 £126 £126 £19,207 152.7 yrs £-16,692
7 kW 5868 kWh 4401 kWh 1467 kWh £0 £147 £147 £21,242 144.8 yrs £-18,308
8 kW 6706 kWh 5030 kWh 1677 kWh £0 £168 £168 £23,276 138.8 yrs £-19,923

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: 203.5 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1677 kWh 1291 kWh 386 kWh £0 £39 £39 £13,519 350.6 yrs £-12,748
3 kW 2515 kWh 1936 kWh 578 kWh £0 £58 £58 £15,554 268.9 yrs £-14,397
4 kW 3353 kWh 2582 kWh 771 kWh £0 £77 £77 £17,588 228.1 yrs £-16,046
5 kW 4191 kWh 3227 kWh 964 kWh £0 £96 £96 £19,623 203.5 yrs £-17,695
6 kW 5030 kWh 3873 kWh 1157 kWh £0 £116 £116 £21,657 187.2 yrs £-19,343
7 kW 5868 kWh 4518 kWh 1350 kWh £0 £135 £135 £23,692 175.5 yrs £-20,992
8 kW 6706 kWh 5164 kWh 1542 kWh £0 £154 £154 £25,726 166.8 yrs £-22,641

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
838kWh/kW
A 1 kW system generates ~838 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

Mid and East Antrim (100%)

Areas Covered

Castle Demesne, Fair Green, Kirkinriola, Glenravel, Park, Braidwater, Broughshane, Academy + 3 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

BT42 (Mid and East Antrim)
≈2.2 km away
Local sunshine: ~838 kWh/kWp · -0% vs BT43
BT44 (Causeway Coast and Glens)
≈11.3 km away
Local sunshine: ~868 kWh/kWp · +4% vs BT43
BT41 (Antrim and Newtownabbey)
≈17.3 km away
Local sunshine: ~866 kWh/kWp · +3% vs BT43
BT39 (Antrim and Newtownabbey)
≈21.9 km away
Local sunshine: ~881 kWh/kWp · +5% vs BT43
BT46 (Mid Ulster)
≈25.3 km away
Local sunshine: ~852 kWh/kWp · +2% vs BT43
BT45 (Mid Ulster)
≈25.4 km away
Local sunshine: ~867 kWh/kWp · +3% vs BT43

Similar sunshine across the UK

G33 (Glasgow City)
~838 kWh/kWp · -0% vs BT43
KW3 (Highland)
~838 kWh/kWp · -0% vs BT43
OL13 (Rossendale)
~838 kWh/kWp · +0% vs BT43