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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in DG13 (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).

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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
14.8 years
After this, it's pure profit
Upfront Cost
£12,207
What you pay to get started
Annual Benefit
£824
What you save every year
Profit Over 25 Years
£8,389
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 841 kWh/kW — 9 below 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 841 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)
841 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: £687, Upfront: £10,173, 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 1681 kWh 672 kWh 1009 kWh £174 £101 £275 £4,069 14.8 yrs £1,423
3 kW 2522 kWh 1009 kWh 1513 kWh £261 £151 £412 £6,104 14.8 yrs £2,135
4 kW 3362 kWh 1345 kWh 2017 kWh £348 £202 £549 £8,138 14.8 yrs £2,846
5 kW 4203 kWh 1681 kWh 2522 kWh £434 £252 £687 £10,173 14.8 yrs £3,558
6 kW 5043 kWh 2017 kWh 3026 kWh £521 £303 £824 £12,207 14.8 yrs £4,270
7 kW 5884 kWh 2353 kWh 3530 kWh £608 £353 £961 £14,242 14.8 yrs £4,981
8 kW 6724 kWh 2690 kWh 4034 kWh £695 £403 £1,098 £16,276 14.8 yrs £5,693

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: £820, Upfront: £12,273, Break-even: 15.0 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1681 kWh 1009 kWh 672 kWh £261 £67 £328 £6,169 18.8 yrs £388
3 kW 2522 kWh 1513 kWh 1009 kWh £391 £101 £492 £8,204 16.7 yrs £1,632
4 kW 3362 kWh 2017 kWh 1345 kWh £521 £134 £656 £10,238 15.6 yrs £2,877
5 kW 4203 kWh 2522 kWh 1681 kWh £652 £168 £820 £12,273 15.0 yrs £4,121
6 kW 5043 kWh 3026 kWh 2017 kWh £782 £202 £984 £14,307 14.5 yrs £5,365
7 kW 5884 kWh 3530 kWh 2353 kWh £912 £235 £1,148 £16,342 14.2 yrs £6,609
8 kW 6724 kWh 4034 kWh 2690 kWh £1,043 £269 £1,311 £18,376 14.0 yrs £7,853

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: £886, Upfront: £13,673, Break-even: 15.4 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1681 kWh 1177 kWh 504 kWh £304 £50 £354 £7,569 21.4 yrs £-479
3 kW 2522 kWh 1765 kWh 756 kWh £456 £76 £532 £9,604 18.1 yrs £1,031
4 kW 3362 kWh 2353 kWh 1009 kWh £608 £101 £709 £11,638 16.4 yrs £2,542
5 kW 4203 kWh 2942 kWh 1261 kWh £760 £126 £886 £13,673 15.4 yrs £4,052
6 kW 5043 kWh 3530 kWh 1513 kWh £912 £151 £1,063 £15,707 14.8 yrs £5,563
7 kW 5884 kWh 4118 kWh 1765 kWh £1,064 £177 £1,241 £17,742 14.3 yrs £7,073
8 kW 6724 kWh 4707 kWh 2017 kWh £1,216 £202 £1,418 £19,776 13.9 yrs £8,583

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: £906, Upfront: £15,423, Break-even: 17.0 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1681 kWh 1227 kWh 454 kWh £317 £45 £362 £9,319 25.7 yrs £-2,069
3 kW 2522 kWh 1841 kWh 681 kWh £476 £68 £544 £11,354 20.9 yrs £-479
4 kW 3362 kWh 2454 kWh 908 kWh £634 £91 £725 £13,388 18.5 yrs £1,111
5 kW 4203 kWh 3068 kWh 1135 kWh £793 £113 £906 £15,423 17.0 yrs £2,702
6 kW 5043 kWh 3681 kWh 1362 kWh £951 £136 £1,087 £17,457 16.1 yrs £4,292
7 kW 5884 kWh 4295 kWh 1589 kWh £1,110 £159 £1,269 £19,492 15.4 yrs £5,882
8 kW 6724 kWh 4909 kWh 1816 kWh £1,268 £182 £1,450 £21,526 14.8 yrs £7,472

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: £920, Upfront: £17,173, Break-even: 18.7 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1681 kWh 1261 kWh 420 kWh £326 £42 £368 £11,069 30.1 yrs £-3,713
3 kW 2522 kWh 1891 kWh 630 kWh £489 £63 £552 £13,104 23.8 yrs £-2,069
4 kW 3362 kWh 2522 kWh 841 kWh £652 £84 £736 £15,138 20.6 yrs £-426
5 kW 4203 kWh 3152 kWh 1051 kWh £814 £105 £920 £17,173 18.7 yrs £1,218
6 kW 5043 kWh 3782 kWh 1261 kWh £977 £126 £1,103 £19,207 17.4 yrs £2,861
7 kW 5884 kWh 4413 kWh 1471 kWh £1,140 £147 £1,287 £21,242 16.5 yrs £4,505
8 kW 6724 kWh 5043 kWh 1681 kWh £1,303 £168 £1,471 £23,276 15.8 yrs £6,148

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: £933, Upfront: £19,623, Break-even: 21.0 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1681 kWh 1294 kWh 387 kWh £334 £39 £373 £13,519 36.2 yrs £-6,056
3 kW 2522 kWh 1942 kWh 580 kWh £502 £58 £560 £15,554 27.8 yrs £-4,360
4 kW 3362 kWh 2589 kWh 773 kWh £669 £77 £746 £17,588 23.6 yrs £-2,663
5 kW 4203 kWh 3236 kWh 967 kWh £836 £97 £933 £19,623 21.0 yrs £-966
6 kW 5043 kWh 3883 kWh 1160 kWh £1,003 £116 £1,119 £21,657 19.3 yrs £731
7 kW 5884 kWh 4530 kWh 1353 kWh £1,171 £135 £1,306 £23,692 18.1 yrs £2,428
8 kW 6724 kWh 5178 kWh 1547 kWh £1,338 £155 £1,493 £25,726 17.2 yrs £4,125

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 DG13

Figures below are tailored to DG13 — click through for full league tables.

Solar Payback Index Rank #2749 of 2997
12.9 years (UK avg 11.3 years)
~£944 /yr • £12,207 upfront
Standing-Charge Drag Rank #1820 of 2997
21.9% (UK avg 21.7%) drag on savings
£206 fixed • ~£944 /yr value

Your Area at a Glance

Your Electricity Rate
25.84p/kWh
Daily Fixed Charge
56.55p/day
Local Sunshine
841kWh/kW
A 1 kW system generates ~841 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 East and Eskdale, Annandale North

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

DG14 (Dumfries and Galloway)
≈8.4 km away
Local sunshine: ~863 kWh/kWp · +3% vs DG13
DG16 (Dumfries and Galloway)
≈18.0 km away
Local sunshine: ~900 kWh/kWp · +7% vs DG13
DG11 (Dumfries and Galloway)
≈22.8 km away
Local sunshine: ~875 kWh/kWp · +4% vs DG13
DG12 (Dumfries and Galloway)
≈24.6 km away
Local sunshine: ~906 kWh/kWp · +8% vs DG13
TD9 (Scottish Borders)
≈33.0 km away
Local sunshine: ~843 kWh/kWp · +0% vs DG13
DG10 (Dumfries and Galloway)
≈34.5 km away
Local sunshine: ~794 kWh/kWp · -6% vs DG13

Similar sunshine across the UK

NE48 (Northumberland)
~840 kWh/kWp · -0% vs DG13
SK15 (Tameside)
~841 kWh/kWp · +0% vs DG13
PA20 (Argyll and Bute)
~841 kWh/kWp · +0% vs DG13