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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in BT24 (Newry, Mourne and Down)

See if solar pays off for you in Newry, Mourne and Down — 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
37.0 years
After this, it's pure profit
Upfront Cost
£12,207
What you pay to get started
Annual Benefit
£330
What you save every year
Profit Over 25 Years
£-3,954
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 917 kWh/kW — 74 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 917 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)
917 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: £275, Upfront: £10,173, Break-even: 37.0 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1834 kWh 734 kWh 1100 kWh £0 £110 £110 £4,069 37.0 yrs £-1,868
3 kW 2751 kWh 1100 kWh 1651 kWh £0 £165 £165 £6,104 37.0 yrs £-2,802
4 kW 3668 kWh 1467 kWh 2201 kWh £0 £220 £220 £8,138 37.0 yrs £-3,736
5 kW 4585 kWh 1834 kWh 2751 kWh £0 £275 £275 £10,173 37.0 yrs £-4,670
6 kW 5502 kWh 2201 kWh 3301 kWh £0 £330 £330 £12,207 37.0 yrs £-5,605
7 kW 6419 kWh 2568 kWh 3851 kWh £0 £385 £385 £14,242 37.0 yrs £-6,539
8 kW 7336 kWh 2934 kWh 4402 kWh £0 £440 £440 £16,276 37.0 yrs £-7,473

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: £183, Upfront: £12,273, Break-even: 66.9 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1834 kWh 1100 kWh 734 kWh £0 £73 £73 £6,169 84.1 yrs £-4,702
3 kW 2751 kWh 1651 kWh 1100 kWh £0 £110 £110 £8,204 74.5 yrs £-6,003
4 kW 3668 kWh 2201 kWh 1467 kWh £0 £147 £147 £10,238 69.8 yrs £-7,304
5 kW 4585 kWh 2751 kWh 1834 kWh £0 £183 £183 £12,273 66.9 yrs £-8,605
6 kW 5502 kWh 3301 kWh 2201 kWh £0 £220 £220 £14,307 65.0 yrs £-9,905
7 kW 6419 kWh 3851 kWh 2568 kWh £0 £257 £257 £16,342 63.6 yrs £-11,206
8 kW 7336 kWh 4402 kWh 2934 kWh £0 £293 £293 £18,376 62.6 yrs £-12,507

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: £138, Upfront: £13,673, Break-even: 99.4 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1834 kWh 1284 kWh 550 kWh £0 £55 £55 £7,569 137.6 yrs £-6,469
3 kW 2751 kWh 1926 kWh 825 kWh £0 £83 £83 £9,604 116.4 yrs £-7,953
4 kW 3668 kWh 2568 kWh 1100 kWh £0 £110 £110 £11,638 105.8 yrs £-9,437
5 kW 4585 kWh 3210 kWh 1376 kWh £0 £138 £138 £13,673 99.4 yrs £-10,922
6 kW 5502 kWh 3851 kWh 1651 kWh £0 £165 £165 £15,707 95.2 yrs £-12,406
7 kW 6419 kWh 4493 kWh 1926 kWh £0 £193 £193 £17,742 92.1 yrs £-13,890
8 kW 7336 kWh 5135 kWh 2201 kWh £0 £220 £220 £19,776 89.9 yrs £-15,374

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: £124, Upfront: £15,423, Break-even: 124.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1834 kWh 1339 kWh 495 kWh £0 £50 £50 £9,319 188.2 yrs £-8,329
3 kW 2751 kWh 2008 kWh 743 kWh £0 £74 £74 £11,354 152.9 yrs £-9,868
4 kW 3668 kWh 2678 kWh 990 kWh £0 £99 £99 £13,388 135.2 yrs £-11,407
5 kW 4585 kWh 3347 kWh 1238 kWh £0 £124 £124 £15,423 124.6 yrs £-12,947
6 kW 5502 kWh 4017 kWh 1486 kWh £0 £149 £149 £17,457 117.5 yrs £-14,486
7 kW 6419 kWh 4686 kWh 1733 kWh £0 £173 £173 £19,492 112.5 yrs £-16,025
8 kW 7336 kWh 5355 kWh 1981 kWh £0 £198 £198 £21,526 108.7 yrs £-17,565

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: £115, Upfront: £17,173, Break-even: 149.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1834 kWh 1376 kWh 459 kWh £0 £46 £46 £11,069 241.4 yrs £-10,152
3 kW 2751 kWh 2063 kWh 688 kWh £0 £69 £69 £13,104 190.5 yrs £-11,728
4 kW 3668 kWh 2751 kWh 917 kWh £0 £92 £92 £15,138 165.1 yrs £-13,304
5 kW 4585 kWh 3439 kWh 1146 kWh £0 £115 £115 £17,173 149.8 yrs £-14,880
6 kW 5502 kWh 4127 kWh 1376 kWh £0 £138 £138 £19,207 139.6 yrs £-16,456
7 kW 6419 kWh 4814 kWh 1605 kWh £0 £160 £160 £21,242 132.4 yrs £-18,032
8 kW 7336 kWh 5502 kWh 1834 kWh £0 £183 £183 £23,276 126.9 yrs £-19,608

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: £105, Upfront: £19,623, Break-even: 186.1 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1834 kWh 1412 kWh 422 kWh £0 £42 £42 £13,519 320.5 yrs £-12,675
3 kW 2751 kWh 2118 kWh 633 kWh £0 £63 £63 £15,554 245.8 yrs £-14,288
4 kW 3668 kWh 2824 kWh 844 kWh £0 £84 £84 £17,588 208.5 yrs £-15,901
5 kW 4585 kWh 3530 kWh 1055 kWh £0 £105 £105 £19,623 186.1 yrs £-17,513
6 kW 5502 kWh 4237 kWh 1265 kWh £0 £127 £127 £21,657 171.1 yrs £-19,126
7 kW 6419 kWh 4943 kWh 1476 kWh £0 £148 £148 £23,692 160.5 yrs £-20,739
8 kW 7336 kWh 5649 kWh 1687 kWh £0 £169 £169 £25,726 152.5 yrs £-22,351

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
917kWh/kW
A 1 kW system generates ~917 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

Newry, Mourne and Down (93%)|Lisburn and Castlereagh (7%)

Areas Covered

Saintfield, Ballynahinch, Drumaness, Kilmore, Ballyward, Derryboy, Dromara, Ballymacbrennan + 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

BT26 (Lisburn and Castlereagh)
≈13.9 km away
Local sunshine: ~889 kWh/kWp · -3% vs BT24
BT30 (Newry, Mourne and Down)
≈14.4 km away
Local sunshine: ~976 kWh/kWp · +6% vs BT24
BT27 (Lisburn and Castlereagh)
≈15.1 km away
Local sunshine: ~894 kWh/kWp · -2% vs BT24
BT8 (Lisburn and Castlereagh)
≈15.9 km away
Local sunshine: ~891 kWh/kWp · -3% vs BT24
BT31 (Newry, Mourne and Down)
≈15.9 km away
Local sunshine: ~916 kWh/kWp · -0% vs BT24
BT25 (Armagh City, Banbridge and Craigavon)
≈16.6 km away
Local sunshine: ~886 kWh/kWp · -3% vs BT24

Similar sunshine across the UK

L40 (West Lancashire)
~917 kWh/kWp · +0% vs BT24
LA4 (Lancaster)
~917 kWh/kWp · -0% vs BT24
LA3 (Lancaster)
~917 kWh/kWp · -0% vs BT24