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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in BT33 (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
37.9 years
After this, it's pure profit
Upfront Cost
£12,207
What you pay to get started
Annual Benefit
£322
What you save every year
Profit Over 25 Years
£-4,151
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 895 kWh/kW — 96 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 895 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)
895 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: £269, Upfront: £10,173, Break-even: 37.9 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1790 kWh 716 kWh 1074 kWh £0 £107 £107 £4,069 37.9 yrs £-1,921
3 kW 2685 kWh 1074 kWh 1611 kWh £0 £161 £161 £6,104 37.9 yrs £-2,881
4 kW 3580 kWh 1432 kWh 2148 kWh £0 £215 £215 £8,138 37.9 yrs £-3,842
5 kW 4476 kWh 1790 kWh 2685 kWh £0 £269 £269 £10,173 37.9 yrs £-4,802
6 kW 5371 kWh 2148 kWh 3222 kWh £0 £322 £322 £12,207 37.9 yrs £-5,762
7 kW 6266 kWh 2506 kWh 3759 kWh £0 £376 £376 £14,242 37.9 yrs £-6,723
8 kW 7161 kWh 2864 kWh 4296 kWh £0 £430 £430 £16,276 37.9 yrs £-7,683

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: £179, Upfront: £12,273, Break-even: 68.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1790 kWh 1074 kWh 716 kWh £0 £72 £72 £6,169 86.1 yrs £-4,737
3 kW 2685 kWh 1611 kWh 1074 kWh £0 £107 £107 £8,204 76.4 yrs £-6,055
4 kW 3580 kWh 2148 kWh 1432 kWh £0 £143 £143 £10,238 71.5 yrs £-7,374
5 kW 4476 kWh 2685 kWh 1790 kWh £0 £179 £179 £12,273 68.6 yrs £-8,692
6 kW 5371 kWh 3222 kWh 2148 kWh £0 £215 £215 £14,307 66.6 yrs £-10,011
7 kW 6266 kWh 3759 kWh 2506 kWh £0 £251 £251 £16,342 65.2 yrs £-11,329
8 kW 7161 kWh 4296 kWh 2864 kWh £0 £286 £286 £18,376 64.2 yrs £-12,647

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: £134, Upfront: £13,673, Break-even: 101.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1790 kWh 1253 kWh 537 kWh £0 £54 £54 £7,569 140.9 yrs £-6,495
3 kW 2685 kWh 1880 kWh 806 kWh £0 £81 £81 £9,604 119.2 yrs £-7,992
4 kW 3580 kWh 2506 kWh 1074 kWh £0 £107 £107 £11,638 108.3 yrs £-9,490
5 kW 4476 kWh 3133 kWh 1343 kWh £0 £134 £134 £13,673 101.8 yrs £-10,987
6 kW 5371 kWh 3759 kWh 1611 kWh £0 £161 £161 £15,707 97.5 yrs £-12,485
7 kW 6266 kWh 4386 kWh 1880 kWh £0 £188 £188 £17,742 94.4 yrs £-13,982
8 kW 7161 kWh 5013 kWh 2148 kWh £0 £215 £215 £19,776 92.1 yrs £-15,480

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: £121, Upfront: £15,423, Break-even: 127.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1790 kWh 1307 kWh 483 kWh £0 £48 £48 £9,319 192.8 yrs £-8,352
3 kW 2685 kWh 1960 kWh 725 kWh £0 £73 £73 £11,354 156.6 yrs £-9,903
4 kW 3580 kWh 2614 kWh 967 kWh £0 £97 £97 £13,388 138.5 yrs £-11,455
5 kW 4476 kWh 3267 kWh 1208 kWh £0 £121 £121 £15,423 127.6 yrs £-13,006
6 kW 5371 kWh 3921 kWh 1450 kWh £0 £145 £145 £17,457 120.4 yrs £-14,557
7 kW 6266 kWh 4574 kWh 1692 kWh £0 £169 £169 £19,492 115.2 yrs £-16,108
8 kW 7161 kWh 5227 kWh 1933 kWh £0 £193 £193 £21,526 111.3 yrs £-17,659

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: £112, Upfront: £17,173, Break-even: 153.5 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1790 kWh 1343 kWh 448 kWh £0 £45 £45 £11,069 247.3 yrs £-10,174
3 kW 2685 kWh 2014 kWh 671 kWh £0 £67 £67 £13,104 195.2 yrs £-11,761
4 kW 3580 kWh 2685 kWh 895 kWh £0 £90 £90 £15,138 169.1 yrs £-13,348
5 kW 4476 kWh 3357 kWh 1119 kWh £0 £112 £112 £17,173 153.5 yrs £-14,935
6 kW 5371 kWh 4028 kWh 1343 kWh £0 £134 £134 £19,207 143.1 yrs £-16,522
7 kW 6266 kWh 4699 kWh 1566 kWh £0 £157 £157 £21,242 135.6 yrs £-18,109
8 kW 7161 kWh 5371 kWh 1790 kWh £0 £179 £179 £23,276 130.0 yrs £-19,696

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: £103, Upfront: £19,623, Break-even: 190.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1790 kWh 1378 kWh 412 kWh £0 £41 £41 £13,519 328.3 yrs £-12,696
3 kW 2685 kWh 2068 kWh 618 kWh £0 £62 £62 £15,554 251.8 yrs £-14,318
4 kW 3580 kWh 2757 kWh 823 kWh £0 £82 £82 £17,588 213.6 yrs £-15,941
5 kW 4476 kWh 3446 kWh 1029 kWh £0 £103 £103 £19,623 190.6 yrs £-17,564
6 kW 5371 kWh 4135 kWh 1235 kWh £0 £124 £124 £21,657 175.3 yrs £-19,187
7 kW 6266 kWh 4825 kWh 1441 kWh £0 £144 £144 £23,692 164.4 yrs £-20,809
8 kW 7161 kWh 5514 kWh 1647 kWh £0 £165 £165 £25,726 156.2 yrs £-22,432

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
895kWh/kW
A 1 kW system generates ~895 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 (100%)

Areas Covered

Donard, Murlough, Dundrum, Tollymore, Annalong

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

BT31 (Newry, Mourne and Down)
≈6.5 km away
Local sunshine: ~916 kWh/kWp · +2% vs BT33
BT30 (Newry, Mourne and Down)
≈17.1 km away
Local sunshine: ~976 kWh/kWp · +9% vs BT33
BT24 (Newry, Mourne and Down)
≈21.0 km away
Local sunshine: ~917 kWh/kWp · +2% vs BT33
BT34 (Newry, Mourne and Down)
≈22.2 km away
Local sunshine: ~898 kWh/kWp · +0% vs BT33
BT25 (Armagh City, Banbridge and Craigavon)
≈26.2 km away
Local sunshine: ~886 kWh/kWp · -1% vs BT33
BT32 (Armagh City, Banbridge and Craigavon)
≈28.2 km away
Local sunshine: ~889 kWh/kWp · -1% vs BT33

Similar sunshine across the UK

SA18 (Carmarthenshire)
~895 kWh/kWp · +0% vs BT33
S33 (High Peak)
~896 kWh/kWp · +0% vs BT33
KY4 (Fife)
~896 kWh/kWp · +0% vs BT33