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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in BT82 (Derry City and Strabane)

See if solar pays off for you in Derry City and Strabane — 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
42.6 years
After this, it's pure profit
Upfront Cost
£12,207
What you pay to get started
Annual Benefit
£286
What you save every year
Profit Over 25 Years
£-5,048
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 795 kWh/kW — 195 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 795 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)
795 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: £239, Upfront: £10,173, Break-even: 42.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1591 kWh 636 kWh 955 kWh £0 £95 £95 £4,069 42.6 yrs £-2,160
3 kW 2386 kWh 955 kWh 1432 kWh £0 £143 £143 £6,104 42.6 yrs £-3,240
4 kW 3182 kWh 1273 kWh 1909 kWh £0 £191 £191 £8,138 42.6 yrs £-4,320
5 kW 3977 kWh 1591 kWh 2386 kWh £0 £239 £239 £10,173 42.6 yrs £-5,400
6 kW 4773 kWh 1909 kWh 2864 kWh £0 £286 £286 £12,207 42.6 yrs £-6,480
7 kW 5568 kWh 2227 kWh 3341 kWh £0 £334 £334 £14,242 42.6 yrs £-7,559
8 kW 6364 kWh 2546 kWh 3818 kWh £0 £382 £382 £16,276 42.6 yrs £-8,639

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: £159, Upfront: £12,273, Break-even: 77.1 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1591 kWh 955 kWh 636 kWh £0 £64 £64 £6,169 96.9 yrs £-4,896
3 kW 2386 kWh 1432 kWh 955 kWh £0 £95 £95 £8,204 85.9 yrs £-6,294
4 kW 3182 kWh 1909 kWh 1273 kWh £0 £127 £127 £10,238 80.4 yrs £-7,692
5 kW 3977 kWh 2386 kWh 1591 kWh £0 £159 £159 £12,273 77.1 yrs £-9,091
6 kW 4773 kWh 2864 kWh 1909 kWh £0 £191 £191 £14,307 74.9 yrs £-10,489
7 kW 5568 kWh 3341 kWh 2227 kWh £0 £223 £223 £16,342 73.4 yrs £-11,887
8 kW 6364 kWh 3818 kWh 2546 kWh £0 £255 £255 £18,376 72.2 yrs £-13,285

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: £119, Upfront: £13,673, Break-even: 114.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1591 kWh 1114 kWh 477 kWh £0 £48 £48 £7,569 158.6 yrs £-6,614
3 kW 2386 kWh 1671 kWh 716 kWh £0 £72 £72 £9,604 134.1 yrs £-8,172
4 kW 3182 kWh 2227 kWh 955 kWh £0 £95 £95 £11,638 121.9 yrs £-9,729
5 kW 3977 kWh 2784 kWh 1193 kWh £0 £119 £119 £13,673 114.6 yrs £-11,286
6 kW 4773 kWh 3341 kWh 1432 kWh £0 £143 £143 £15,707 109.7 yrs £-12,843
7 kW 5568 kWh 3898 kWh 1671 kWh £0 £167 £167 £17,742 106.2 yrs £-14,401
8 kW 6364 kWh 4455 kWh 1909 kWh £0 £191 £191 £19,776 103.6 yrs £-15,958

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: £107, Upfront: £15,423, Break-even: 143.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1591 kWh 1161 kWh 430 kWh £0 £43 £43 £9,319 216.9 yrs £-8,460
3 kW 2386 kWh 1742 kWh 644 kWh £0 £64 £64 £11,354 176.2 yrs £-10,065
4 kW 3182 kWh 2323 kWh 859 kWh £0 £86 £86 £13,388 155.8 yrs £-11,670
5 kW 3977 kWh 2904 kWh 1074 kWh £0 £107 £107 £15,423 143.6 yrs £-13,275
6 kW 4773 kWh 3484 kWh 1289 kWh £0 £129 £129 £17,457 135.5 yrs £-14,880
7 kW 5568 kWh 4065 kWh 1503 kWh £0 £150 £150 £19,492 129.6 yrs £-16,485
8 kW 6364 kWh 4646 kWh 1718 kWh £0 £172 £172 £21,526 125.3 yrs £-18,090

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: £99, Upfront: £17,173, Break-even: 172.7 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1591 kWh 1193 kWh 398 kWh £0 £40 £40 £11,069 278.3 yrs £-10,274
3 kW 2386 kWh 1790 kWh 597 kWh £0 £60 £60 £13,104 219.6 yrs £-11,910
4 kW 3182 kWh 2386 kWh 795 kWh £0 £80 £80 £15,138 190.3 yrs £-13,547
5 kW 3977 kWh 2983 kWh 994 kWh £0 £99 £99 £17,173 172.7 yrs £-15,184
6 kW 4773 kWh 3580 kWh 1193 kWh £0 £119 £119 £19,207 161.0 yrs £-16,821
7 kW 5568 kWh 4176 kWh 1392 kWh £0 £139 £139 £21,242 152.6 yrs £-18,457
8 kW 6364 kWh 4773 kWh 1591 kWh £0 £159 £159 £23,276 146.3 yrs £-20,094

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: £91, Upfront: £19,623, Break-even: 214.5 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1591 kWh 1225 kWh 366 kWh £0 £37 £37 £13,519 369.4 yrs £-12,787
3 kW 2386 kWh 1838 kWh 549 kWh £0 £55 £55 £15,554 283.4 yrs £-14,456
4 kW 3182 kWh 2450 kWh 732 kWh £0 £73 £73 £17,588 240.3 yrs £-16,124
5 kW 3977 kWh 3063 kWh 915 kWh £0 £91 £91 £19,623 214.5 yrs £-17,793
6 kW 4773 kWh 3675 kWh 1098 kWh £0 £110 £110 £21,657 197.3 yrs £-19,462
7 kW 5568 kWh 4288 kWh 1281 kWh £0 £128 £128 £23,692 185.0 yrs £-21,130
8 kW 6364 kWh 4900 kWh 1464 kWh £0 £146 £146 £25,726 175.8 yrs £-22,799

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
795kWh/kW
A 1 kW system generates ~795 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

Derry City and Strabane (100%)

Areas Covered

Strabane North, Dunnamanagh, Artigarvan, Sion Mills, Finn, Strabane West, Ballycolman, Glenelly Valley + 2 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

BT81 (Derry City and Strabane)
≈15.9 km away
Local sunshine: ~837 kWh/kWp · +5% vs BT82
BT47 (Derry City and Strabane)
≈21.8 km away
Local sunshine: ~806 kWh/kWp · +1% vs BT82
BT48 (Derry City and Strabane)
≈21.8 km away
Local sunshine: ~827 kWh/kWp · +4% vs BT82
BT78 (Fermanagh and Omagh)
≈27.1 km away
Local sunshine: ~832 kWh/kWp · +5% vs BT82
BT79 (Fermanagh and Omagh)
≈27.9 km away
Local sunshine: ~827 kWh/kWp · +4% vs BT82
BT49 (Causeway Coast and Glens)
≈40.9 km away
Local sunshine: ~846 kWh/kWp · +6% vs BT82

Similar sunshine across the UK

LL47 (Gwynedd)
~795 kWh/kWp · -0% vs BT82
PA17 (North Ayrshire)
~796 kWh/kWp · +0% vs BT82
DG10 (Dumfries and Galloway)
~794 kWh/kWp · -0% vs BT82