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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in BT34 (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
37.8 years
After this, it's pure profit
Upfront Cost
£12,207
What you pay to get started
Annual Benefit
£323
What you save every year
Profit Over 25 Years
£-4,127
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 898 kWh/kW — 93 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 898 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)
898 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: 37.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1796 kWh 718 kWh 1077 kWh £0 £108 £108 £4,069 37.8 yrs £-1,914
3 kW 2693 kWh 1077 kWh 1616 kWh £0 £162 £162 £6,104 37.8 yrs £-2,872
4 kW 3591 kWh 1436 kWh 2155 kWh £0 £215 £215 £8,138 37.8 yrs £-3,829
5 kW 4489 kWh 1796 kWh 2693 kWh £0 £269 £269 £10,173 37.8 yrs £-4,786
6 kW 5387 kWh 2155 kWh 3232 kWh £0 £323 £323 £12,207 37.8 yrs £-5,743
7 kW 6284 kWh 2514 kWh 3771 kWh £0 £377 £377 £14,242 37.8 yrs £-6,700
8 kW 7182 kWh 2873 kWh 4309 kWh £0 £431 £431 £16,276 37.8 yrs £-7,657

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: £180, Upfront: £12,273, Break-even: 68.4 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1796 kWh 1077 kWh 718 kWh £0 £72 £72 £6,169 85.9 yrs £-4,733
3 kW 2693 kWh 1616 kWh 1077 kWh £0 £108 £108 £8,204 76.1 yrs £-6,049
4 kW 3591 kWh 2155 kWh 1436 kWh £0 £144 £144 £10,238 71.3 yrs £-7,365
5 kW 4489 kWh 2693 kWh 1796 kWh £0 £180 £180 £12,273 68.4 yrs £-8,681
6 kW 5387 kWh 3232 kWh 2155 kWh £0 £215 £215 £14,307 66.4 yrs £-9,998
7 kW 6284 kWh 3771 kWh 2514 kWh £0 £251 £251 £16,342 65.0 yrs £-11,314
8 kW 7182 kWh 4309 kWh 2873 kWh £0 £287 £287 £18,376 64.0 yrs £-12,630

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: £135, Upfront: £13,673, Break-even: 101.5 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1796 kWh 1257 kWh 539 kWh £0 £54 £54 £7,569 140.5 yrs £-6,492
3 kW 2693 kWh 1885 kWh 808 kWh £0 £81 £81 £9,604 118.9 yrs £-7,988
4 kW 3591 kWh 2514 kWh 1077 kWh £0 £108 £108 £11,638 108.0 yrs £-9,483
5 kW 4489 kWh 3142 kWh 1347 kWh £0 £135 £135 £13,673 101.5 yrs £-10,979
6 kW 5387 kWh 3771 kWh 1616 kWh £0 £162 £162 £15,707 97.2 yrs £-12,475
7 kW 6284 kWh 4399 kWh 1885 kWh £0 £189 £189 £17,742 94.1 yrs £-13,971
8 kW 7182 kWh 5028 kWh 2155 kWh £0 £215 £215 £19,776 91.8 yrs £-15,467

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: 127.2 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1796 kWh 1311 kWh 485 kWh £0 £48 £48 £9,319 192.2 yrs £-8,349
3 kW 2693 kWh 1966 kWh 727 kWh £0 £73 £73 £11,354 156.1 yrs £-9,899
4 kW 3591 kWh 2621 kWh 970 kWh £0 £97 £97 £13,388 138.1 yrs £-11,449
5 kW 4489 kWh 3277 kWh 1212 kWh £0 £121 £121 £15,423 127.2 yrs £-12,999
6 kW 5387 kWh 3932 kWh 1454 kWh £0 £145 £145 £17,457 120.0 yrs £-14,548
7 kW 6284 kWh 4588 kWh 1697 kWh £0 £170 £170 £19,492 114.9 yrs £-16,098
8 kW 7182 kWh 5243 kWh 1939 kWh £0 £194 £194 £21,526 111.0 yrs £-17,648

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: 153.0 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1796 kWh 1347 kWh 449 kWh £0 £45 £45 £11,069 246.6 yrs £-10,171
3 kW 2693 kWh 2020 kWh 673 kWh £0 £67 £67 £13,104 194.6 yrs £-11,757
4 kW 3591 kWh 2693 kWh 898 kWh £0 £90 £90 £15,138 168.6 yrs £-13,342
5 kW 4489 kWh 3367 kWh 1122 kWh £0 £112 £112 £17,173 153.0 yrs £-14,928
6 kW 5387 kWh 4040 kWh 1347 kWh £0 £135 £135 £19,207 142.6 yrs £-16,514
7 kW 6284 kWh 4713 kWh 1571 kWh £0 £157 £157 £21,242 135.2 yrs £-18,099
8 kW 7182 kWh 5387 kWh 1796 kWh £0 £180 £180 £23,276 129.6 yrs £-19,685

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: 190.1 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1796 kWh 1383 kWh 413 kWh £0 £41 £41 £13,519 327.4 yrs £-12,693
3 kW 2693 kWh 2074 kWh 619 kWh £0 £62 £62 £15,554 251.1 yrs £-14,315
4 kW 3591 kWh 2765 kWh 826 kWh £0 £83 £83 £17,588 212.9 yrs £-15,936
5 kW 4489 kWh 3456 kWh 1032 kWh £0 £103 £103 £19,623 190.1 yrs £-17,558
6 kW 5387 kWh 4148 kWh 1239 kWh £0 £124 £124 £21,657 174.8 yrs £-19,179
7 kW 6284 kWh 4839 kWh 1445 kWh £0 £145 £145 £23,692 163.9 yrs £-20,801
8 kW 7182 kWh 5530 kWh 1652 kWh £0 £165 £165 £25,726 155.7 yrs £-22,422

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
898kWh/kW
A 1 kW system generates ~898 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 (94%)|Armagh City, Banbridge and Craigavon (6%)

Areas Covered

Abbey, Mayobridge, Hilltown, Warrenpoint, Rostrevor, St. Patrick's, Burren, Tollymore + 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

BT35 (Newry, Mourne and Down)
≈11.7 km away
Local sunshine: ~886 kWh/kWp · -1% vs BT34
BT32 (Armagh City, Banbridge and Craigavon)
≈20.6 km away
Local sunshine: ~889 kWh/kWp · -1% vs BT34
BT31 (Newry, Mourne and Down)
≈21.4 km away
Local sunshine: ~916 kWh/kWp · +2% vs BT34
BT33 (Newry, Mourne and Down)
≈22.2 km away
Local sunshine: ~895 kWh/kWp · -0% vs BT34
BT25 (Armagh City, Banbridge and Craigavon)
≈27.4 km away
Local sunshine: ~886 kWh/kWp · -1% vs BT34
BT63 (Armagh City, Banbridge and Craigavon)
≈31.2 km away
Local sunshine: ~880 kWh/kWp · -2% vs BT34

Similar sunshine across the UK

PR25 (South Ribble)
~898 kWh/kWp · +0% vs BT34
EH32 (East Lothian)
~897 kWh/kWp · -0% vs BT34
CF45 (Rhondda Cynon Taf)
~898 kWh/kWp · +0% vs BT34