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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in DG11 (Dumfries and Galloway)

See if solar pays off for you in Dumfries and Galloway — 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
14.2 years
After this, it's pure profit
Upfront Cost
£12,207
What you pay to get started
Annual Benefit
£858
What you save every year
Profit Over 25 Years
£9,243
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 Southern Scotland, the current unit rate is 25.84p/kWh with a 56.55p/day standing charge. Your postcode’s south-facing sunshine yield is 875 kWh/kW — 26 above the regional median (850).

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 875 kWh per year on a south-facing roof. We value self-used electricity at 25.8p and exported surplus at a baseline 10p via SEG. Use the calculator above for your exact tariff.

Unit rate
25.8p/kWh
Standing charge
56.5p/day
Sunshine yield (south)
875 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: £715, Upfront: £10,173, Break-even: 14.2 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1751 kWh 700 kWh 1050 kWh £181 £105 £286 £4,069 14.2 yrs £1,651
3 kW 2626 kWh 1050 kWh 1576 kWh £271 £158 £429 £6,104 14.2 yrs £2,477
4 kW 3502 kWh 1401 kWh 2101 kWh £362 £210 £572 £8,138 14.2 yrs £3,302
5 kW 4377 kWh 1751 kWh 2626 kWh £452 £263 £715 £10,173 14.2 yrs £4,128
6 kW 5252 kWh 2101 kWh 3151 kWh £543 £315 £858 £12,207 14.2 yrs £4,953
7 kW 6128 kWh 2451 kWh 3677 kWh £633 £368 £1,001 £14,242 14.2 yrs £5,779
8 kW 7003 kWh 2801 kWh 4202 kWh £724 £420 £1,144 £16,276 14.2 yrs £6,605

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: £854, Upfront: £12,273, Break-even: 14.4 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1751 kWh 1050 kWh 700 kWh £271 £70 £341 £6,169 18.1 yrs £660
3 kW 2626 kWh 1576 kWh 1050 kWh £407 £105 £512 £8,204 16.0 yrs £2,041
4 kW 3502 kWh 2101 kWh 1401 kWh £543 £140 £683 £10,238 15.0 yrs £3,421
5 kW 4377 kWh 2626 kWh 1751 kWh £679 £175 £854 £12,273 14.4 yrs £4,801
6 kW 5252 kWh 3151 kWh 2101 kWh £814 £210 £1,024 £14,307 14.0 yrs £6,181
7 kW 6128 kWh 3677 kWh 2451 kWh £950 £245 £1,195 £16,342 13.7 yrs £7,561
8 kW 7003 kWh 4202 kWh 2801 kWh £1,086 £280 £1,366 £18,376 13.5 yrs £8,942

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: £923, Upfront: £13,673, Break-even: 14.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1751 kWh 1226 kWh 525 kWh £317 £53 £369 £7,569 20.5 yrs £-185
3 kW 2626 kWh 1838 kWh 788 kWh £475 £79 £554 £9,604 17.3 yrs £1,473
4 kW 3502 kWh 2451 kWh 1050 kWh £633 £105 £738 £11,638 15.8 yrs £3,130
5 kW 4377 kWh 3064 kWh 1313 kWh £792 £131 £923 £13,673 14.8 yrs £4,788
6 kW 5252 kWh 3677 kWh 1576 kWh £950 £158 £1,108 £15,707 14.2 yrs £6,445
7 kW 6128 kWh 4289 kWh 1838 kWh £1,108 £184 £1,292 £17,742 13.7 yrs £8,103
8 kW 7003 kWh 4902 kWh 2101 kWh £1,267 £210 £1,477 £19,776 13.4 yrs £9,760

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: £944, Upfront: £15,423, Break-even: 16.3 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1751 kWh 1278 kWh 473 kWh £330 £47 £378 £9,319 24.7 yrs £-1,769
3 kW 2626 kWh 1917 kWh 709 kWh £495 £71 £566 £11,354 20.0 yrs £-28
4 kW 3502 kWh 2556 kWh 945 kWh £661 £95 £755 £13,388 17.7 yrs £1,713
5 kW 4377 kWh 3195 kWh 1182 kWh £826 £118 £944 £15,423 16.3 yrs £3,454
6 kW 5252 kWh 3834 kWh 1418 kWh £991 £142 £1,133 £17,457 15.4 yrs £5,194
7 kW 6128 kWh 4473 kWh 1654 kWh £1,156 £165 £1,321 £19,492 14.8 yrs £6,935
8 kW 7003 kWh 5112 kWh 1891 kWh £1,321 £189 £1,510 £21,526 14.3 yrs £8,676

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: £958, Upfront: £17,173, Break-even: 17.9 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1751 kWh 1313 kWh 438 kWh £339 £44 £383 £11,069 28.9 yrs £-3,408
3 kW 2626 kWh 1970 kWh 657 kWh £509 £66 £575 £13,104 22.8 yrs £-1,611
4 kW 3502 kWh 2626 kWh 875 kWh £679 £88 £766 £15,138 19.8 yrs £185
5 kW 4377 kWh 3283 kWh 1094 kWh £848 £109 £958 £17,173 17.9 yrs £1,981
6 kW 5252 kWh 3939 kWh 1313 kWh £1,018 £131 £1,149 £19,207 16.7 yrs £3,777
7 kW 6128 kWh 4596 kWh 1532 kWh £1,188 £153 £1,341 £21,242 15.8 yrs £5,573
8 kW 7003 kWh 5252 kWh 1751 kWh £1,357 £175 £1,532 £23,276 15.2 yrs £7,370

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: £972, Upfront: £19,623, Break-even: 20.2 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1751 kWh 1348 kWh 403 kWh £348 £40 £389 £13,519 34.8 yrs £-5,747
3 kW 2626 kWh 2022 kWh 604 kWh £523 £60 £583 £15,554 26.7 yrs £-3,895
4 kW 3502 kWh 2696 kWh 805 kWh £697 £81 £777 £17,588 22.6 yrs £-2,043
5 kW 4377 kWh 3370 kWh 1007 kWh £871 £101 £972 £19,623 20.2 yrs £-192
6 kW 5252 kWh 4044 kWh 1208 kWh £1,045 £121 £1,166 £21,657 18.6 yrs £1,660
7 kW 6128 kWh 4718 kWh 1409 kWh £1,219 £141 £1,360 £23,692 17.4 yrs £3,512
8 kW 7003 kWh 5392 kWh 1611 kWh £1,393 £161 £1,554 £25,726 16.5 yrs £5,363

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.

Insights for DG11

Figures below are tailored to DG11 — click through for full league tables.

Solar Payback Index Rank #2594 of 2997
12.4 years (UK avg 11.3 years)
~£983 /yr • £12,207 upfront
Standing-Charge Drag Rank #1611 of 2997
21.0% (UK avg 21.7%) drag on savings
£206 fixed • ~£983 /yr value

Your Area at a Glance

Your Electricity Rate
25.84p/kWh
Daily Fixed Charge
56.55p/day
Local Sunshine
875kWh/kW
A 1 kW system generates ~875 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

Dumfries and Galloway (100%)

Areas Covered

Annandale North, Annandale East and Eskdale, Annandale South, Lochar

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 Southern Scotland

DG12 (Dumfries and Galloway)
≈16.1 km away
Local sunshine: ~906 kWh/kWp · +3% vs DG11
DG1 (Dumfries and Galloway)
≈16.2 km away
Local sunshine: ~881 kWh/kWp · +1% vs DG11
DG2 (Dumfries and Galloway)
≈18.6 km away
Local sunshine: ~881 kWh/kWp · +1% vs DG11
DG13 (Dumfries and Galloway)
≈22.8 km away
Local sunshine: ~841 kWh/kWp · -4% vs DG11
DG16 (Dumfries and Galloway)
≈23.2 km away
Local sunshine: ~900 kWh/kWp · +3% vs DG11
DG10 (Dumfries and Galloway)
≈24.2 km away
Local sunshine: ~794 kWh/kWp · -9% vs DG11

Similar sunshine across the UK

SK8 (Stockport)
~875 kWh/kWp · -0% vs DG11
HX7 (Calderdale)
~875 kWh/kWp · -0% vs DG11
LL44 (Gwynedd)
~875 kWh/kWp · -0% vs DG11