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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in LD2 (Powys)

See if solar pays off for you in Powys — 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
13.3 years
After this, it's pure profit
Upfront Cost
£12,207
What you pay to get started
Annual Benefit
£916
What you save every year
Profit Over 25 Years
£10,701
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 South Wales, the current unit rate is 26.83p/kWh with a 51.69p/day standing charge. Your postcode’s south-facing sunshine yield is 913 kWh/kW — 56 below the regional median (968).

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 913 kWh per year on a south-facing roof. We value self-used electricity at 26.8p and exported surplus at a baseline 10p via SEG. Use the calculator above for your exact tariff.

Unit rate
26.8p/kWh
Standing charge
51.7p/day
Sunshine yield (south)
913 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: £764, Upfront: £10,173, Break-even: 13.3 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1826 kWh 730 kWh 1095 kWh £196 £110 £305 £4,069 13.3 yrs £2,040
3 kW 2738 kWh 1095 kWh 1643 kWh £294 £164 £458 £6,104 13.3 yrs £3,060
4 kW 3651 kWh 1460 kWh 2191 kWh £392 £219 £611 £8,138 13.3 yrs £4,080
5 kW 4564 kWh 1826 kWh 2738 kWh £490 £274 £764 £10,173 13.3 yrs £5,100
6 kW 5477 kWh 2191 kWh 3286 kWh £588 £329 £916 £12,207 13.3 yrs £6,120
7 kW 6389 kWh 2556 kWh 3834 kWh £686 £383 £1,069 £14,242 13.3 yrs £7,140
8 kW 7302 kWh 2921 kWh 4381 kWh £784 £438 £1,222 £16,276 13.3 yrs £8,160

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: £917, Upfront: £12,273, Break-even: 13.4 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1826 kWh 1095 kWh 730 kWh £294 £73 £367 £6,169 16.8 yrs £1,169
3 kW 2738 kWh 1643 kWh 1095 kWh £441 £110 £550 £8,204 14.9 yrs £2,803
4 kW 3651 kWh 2191 kWh 1460 kWh £588 £146 £734 £10,238 14.0 yrs £4,438
5 kW 4564 kWh 2738 kWh 1826 kWh £735 £183 £917 £12,273 13.4 yrs £6,072
6 kW 5477 kWh 3286 kWh 2191 kWh £882 £219 £1,101 £14,307 13.0 yrs £7,707
7 kW 6389 kWh 3834 kWh 2556 kWh £1,029 £256 £1,284 £16,342 12.7 yrs £9,341
8 kW 7302 kWh 4381 kWh 2921 kWh £1,175 £292 £1,468 £18,376 12.5 yrs £10,975

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: £994, Upfront: £13,673, Break-even: 13.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1826 kWh 1278 kWh 548 kWh £343 £55 £398 £7,569 19.0 yrs £383
3 kW 2738 kWh 1917 kWh 821 kWh £514 £82 £596 £9,604 16.1 yrs £2,325
4 kW 3651 kWh 2556 kWh 1095 kWh £686 £110 £795 £11,638 14.6 yrs £4,267
5 kW 4564 kWh 3195 kWh 1369 kWh £857 £137 £994 £13,673 13.8 yrs £6,208
6 kW 5477 kWh 3834 kWh 1643 kWh £1,029 £164 £1,193 £15,707 13.2 yrs £8,150
7 kW 6389 kWh 4473 kWh 1917 kWh £1,200 £192 £1,392 £17,742 12.7 yrs £10,092
8 kW 7302 kWh 5111 kWh 2191 kWh £1,371 £219 £1,590 £19,776 12.4 yrs £12,033

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: £1,017, Upfront: £15,423, Break-even: 15.2 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1826 kWh 1333 kWh 493 kWh £358 £49 £407 £9,319 22.9 yrs £-1,182
3 kW 2738 kWh 1999 kWh 739 kWh £536 £74 £610 £11,354 18.6 yrs £851
4 kW 3651 kWh 2665 kWh 986 kWh £715 £99 £814 £13,388 16.5 yrs £2,885
5 kW 4564 kWh 3332 kWh 1232 kWh £894 £123 £1,017 £15,423 15.2 yrs £4,919
6 kW 5477 kWh 3998 kWh 1479 kWh £1,073 £148 £1,221 £17,457 14.3 yrs £6,953
7 kW 6389 kWh 4664 kWh 1725 kWh £1,251 £173 £1,424 £19,492 13.7 yrs £8,987
8 kW 7302 kWh 5331 kWh 1972 kWh £1,430 £197 £1,627 £21,526 13.2 yrs £11,021

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: £1,032, Upfront: £17,173, Break-even: 16.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1826 kWh 1369 kWh 456 kWh £367 £46 £413 £11,069 26.8 yrs £-2,809
3 kW 2738 kWh 2054 kWh 685 kWh £551 £68 £619 £13,104 21.2 yrs £-714
4 kW 3651 kWh 2738 kWh 913 kWh £735 £91 £826 £15,138 18.3 yrs £1,381
5 kW 4564 kWh 3423 kWh 1141 kWh £918 £114 £1,032 £17,173 16.6 yrs £3,476
6 kW 5477 kWh 4107 kWh 1369 kWh £1,102 £137 £1,239 £19,207 15.5 yrs £5,572
7 kW 6389 kWh 4792 kWh 1597 kWh £1,286 £160 £1,445 £21,242 14.7 yrs £7,667
8 kW 7302 kWh 5477 kWh 1826 kWh £1,469 £183 £1,652 £23,276 14.1 yrs £9,762

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: £1,048, Upfront: £19,623, 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 1826 kWh 1406 kWh 420 kWh £377 £42 £419 £13,519 32.3 yrs £-5,137
3 kW 2738 kWh 2108 kWh 630 kWh £566 £63 £629 £15,554 24.7 yrs £-2,980
4 kW 3651 kWh 2811 kWh 840 kWh £754 £84 £838 £17,588 21.0 yrs £-823
5 kW 4564 kWh 3514 kWh 1050 kWh £943 £105 £1,048 £19,623 18.7 yrs £1,334
6 kW 5477 kWh 4217 kWh 1260 kWh £1,131 £126 £1,257 £21,657 17.2 yrs £3,490
7 kW 6389 kWh 4920 kWh 1470 kWh £1,320 £147 £1,467 £23,692 16.2 yrs £5,647
8 kW 7302 kWh 5623 kWh 1679 kWh £1,509 £168 £1,676 £25,726 15.3 yrs £7,804

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 LD2

Figures below are tailored to LD2 — click through for full league tables.

Big-Roof Britain Rank #123 of 2182
6.4 kWp (UK avg 5.1 kWp)
~13 panels (≈430 W)
Solar Payback Index Rank #1863 of 2997
11.6 years (UK avg 11.3 years)
~£1,055 /yr • £12,207 upfront
Standing-Charge Drag Rank #965 of 2997
17.9% (UK avg 21.7%) drag on savings
£189 fixed • ~£1,055 /yr value

Your Area at a Glance

Your Electricity Rate
26.83p/kWh
Daily Fixed Charge
51.69p/day
Local Sunshine
913kWh/kW
A 1 kW system generates ~913 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

Houses: 69% • Flats: 11% • Bungalows: 18% Based on 1,390 properties

Coverage

Powys (100%)

Areas Covered

Builth, Llanafanfawr with Garth, Llanelwedd, Bronllys and Felin-fach, Disserth and Trecoed with Newbridge, Llandrindod South, Glasbury

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 South Wales

LD1 (Powys)
≈10.4 km away
Local sunshine: ~902 kWh/kWp · -1% vs LD2
LD4 (Powys)
≈11.0 km away
Local sunshine: ~903 kWh/kWp · -1% vs LD2
LD5 (Powys)
≈16.1 km away
Local sunshine: ~878 kWh/kWp · -4% vs LD2
LD6 (Powys)
≈18.5 km away
Local sunshine: ~903 kWh/kWp · -1% vs LD2
HR3 (Herefordshire, County of)
≈21.3 km away
Local sunshine: ~915 kWh/kWp · +0% vs LD2
LD3 (Powys)
≈22.4 km away
Local sunshine: ~876 kWh/kWp · -4% vs LD2

Similar sunshine across the UK

EH34 (East Lothian)
~913 kWh/kWp · -0% vs LD2
EH42 (East Lothian)
~913 kWh/kWp · +0% vs LD2
WA8 (Halton)
~912 kWh/kWp · -0% vs LD2