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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in SY22 (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
12.9 years
After this, it's pure profit
Upfront Cost
£12,207
What you pay to get started
Annual Benefit
£949
What you save every year
Profit Over 25 Years
£11,517
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 North Wales and Mersey, the current unit rate is 27.72p/kWh with a 69.95p/day standing charge. Your postcode’s south-facing sunshine yield is 926 kWh/kW — 4 below the regional median (930).

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 926 kWh per year on a south-facing roof. We value self-used electricity at 27.7p and exported surplus at a baseline 10p via SEG. Use the calculator above for your exact tariff.

Unit rate
27.7p/kWh
Standing charge
70.0p/day
Sunshine yield (south)
926 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: £791, Upfront: £10,173, Break-even: 12.9 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1851 kWh 740 kWh 1111 kWh £205 £111 £316 £4,069 12.9 yrs £2,257
3 kW 2777 kWh 1111 kWh 1666 kWh £308 £167 £474 £6,104 12.9 yrs £3,386
4 kW 3702 kWh 1481 kWh 2221 kWh £411 £222 £633 £8,138 12.9 yrs £4,515
5 kW 4628 kWh 1851 kWh 2777 kWh £513 £278 £791 £10,173 12.9 yrs £5,643
6 kW 5553 kWh 2221 kWh 3332 kWh £616 £333 £949 £12,207 12.9 yrs £6,772
7 kW 6479 kWh 2592 kWh 3887 kWh £718 £389 £1,107 £14,242 12.9 yrs £7,901
8 kW 7404 kWh 2962 kWh 4443 kWh £821 £444 £1,265 £16,276 12.9 yrs £9,029

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: £955, Upfront: £12,273, Break-even: 12.9 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1851 kWh 1111 kWh 740 kWh £308 £74 £382 £6,169 16.2 yrs £1,469
3 kW 2777 kWh 1666 kWh 1111 kWh £462 £111 £573 £8,204 14.3 yrs £3,254
4 kW 3702 kWh 2221 kWh 1481 kWh £616 £148 £764 £10,238 13.4 yrs £5,039
5 kW 4628 kWh 2777 kWh 1851 kWh £770 £185 £955 £12,273 12.9 yrs £6,824
6 kW 5553 kWh 3332 kWh 2221 kWh £924 £222 £1,146 £14,307 12.5 yrs £8,608
7 kW 6479 kWh 3887 kWh 2592 kWh £1,078 £259 £1,337 £16,342 12.2 yrs £10,393
8 kW 7404 kWh 4443 kWh 2962 kWh £1,232 £296 £1,528 £18,376 12.0 yrs £12,178

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: £1,037, Upfront: £13,673, Break-even: 13.2 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1851 kWh 1296 kWh 555 kWh £359 £56 £415 £7,569 18.3 yrs £725
3 kW 2777 kWh 1944 kWh 833 kWh £539 £83 £622 £9,604 15.4 yrs £2,838
4 kW 3702 kWh 2592 kWh 1111 kWh £718 £111 £829 £11,638 14.0 yrs £4,951
5 kW 4628 kWh 3239 kWh 1388 kWh £898 £139 £1,037 £13,673 13.2 yrs £7,064
6 kW 5553 kWh 3887 kWh 1666 kWh £1,078 £167 £1,244 £15,707 12.6 yrs £9,176
7 kW 6479 kWh 4535 kWh 1944 kWh £1,257 £194 £1,452 £17,742 12.2 yrs £11,289
8 kW 7404 kWh 5183 kWh 2221 kWh £1,437 £222 £1,659 £19,776 11.9 yrs £13,402

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: £1,061, Upfront: £15,423, Break-even: 14.5 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1851 kWh 1351 kWh 500 kWh £375 £50 £425 £9,319 21.9 yrs £-828
3 kW 2777 kWh 2027 kWh 750 kWh £562 £75 £637 £11,354 17.8 yrs £1,383
4 kW 3702 kWh 2703 kWh 1000 kWh £749 £100 £849 £13,388 15.8 yrs £3,595
5 kW 4628 kWh 3378 kWh 1250 kWh £936 £125 £1,061 £15,423 14.5 yrs £5,806
6 kW 5553 kWh 4054 kWh 1499 kWh £1,124 £150 £1,274 £17,457 13.7 yrs £8,017
7 kW 6479 kWh 4730 kWh 1749 kWh £1,311 £175 £1,486 £19,492 13.1 yrs £10,228
8 kW 7404 kWh 5405 kWh 1999 kWh £1,498 £200 £1,698 £21,526 12.7 yrs £12,439

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: £1,078, Upfront: £17,173, Break-even: 15.9 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1851 kWh 1388 kWh 463 kWh £385 £46 £431 £11,069 25.7 yrs £-2,447
3 kW 2777 kWh 2083 kWh 694 kWh £577 £69 £647 £13,104 20.3 yrs £-170
4 kW 3702 kWh 2777 kWh 926 kWh £770 £93 £862 £15,138 17.6 yrs £2,107
5 kW 4628 kWh 3471 kWh 1157 kWh £962 £116 £1,078 £17,173 15.9 yrs £4,384
6 kW 5553 kWh 4165 kWh 1388 kWh £1,155 £139 £1,293 £19,207 14.9 yrs £6,660
7 kW 6479 kWh 4859 kWh 1620 kWh £1,347 £162 £1,509 £21,242 14.1 yrs £8,937
8 kW 7404 kWh 5553 kWh 1851 kWh £1,539 £185 £1,725 £23,276 13.5 yrs £11,214

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: £1,094, Upfront: £19,623, 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 1851 kWh 1425 kWh 426 kWh £395 £43 £438 £13,519 30.9 yrs £-4,765
3 kW 2777 kWh 2138 kWh 639 kWh £593 £64 £657 £15,554 23.7 yrs £-2,423
4 kW 3702 kWh 2851 kWh 852 kWh £790 £85 £875 £17,588 20.1 yrs £-81
5 kW 4628 kWh 3563 kWh 1064 kWh £988 £106 £1,094 £19,623 17.9 yrs £2,262
6 kW 5553 kWh 4276 kWh 1277 kWh £1,185 £128 £1,313 £21,657 16.5 yrs £4,604
7 kW 6479 kWh 4989 kWh 1490 kWh £1,383 £149 £1,532 £23,692 15.5 yrs £6,946
8 kW 7404 kWh 5701 kWh 1703 kWh £1,580 £170 £1,751 £25,726 14.7 yrs £9,289

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 SY22

Figures below are tailored to SY22 — click through for full league tables.

Big-Roof Britain Rank #149 of 2182
6.3 kWp (UK avg 5.1 kWp)
~13 panels (≈430 W)
Solar Payback Index Rank #1462 of 2997
11.1 years (UK avg 11.3 years)
~£1,097 /yr • £12,207 upfront
Standing-Charge Drag Rank #2101 of 2997
23.3% (UK avg 21.7%) drag on savings
£255 fixed • ~£1,097 /yr value

Your Area at a Glance

Your Electricity Rate
27.72p/kWh
Daily Fixed Charge
69.95p/day
Local Sunshine
926kWh/kW
A 1 kW system generates ~926 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: 72% • Flats: 5% • Bungalows: 22% Based on 2,466 properties

Coverage

Powys (93%)|Shropshire (7%)

Areas Covered

Llansantffraid, Llanfyllin, Llangyniew and Meifod, Llandysilio, Llandrinio, Llanymynech, Banwy, Llanfihangel and Llanwddyn + 3 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 North Wales and Mersey

SY10 (Shropshire)
≈11.2 km away
Local sunshine: ~929 kWh/kWp · +0% vs SY22
SY21 (Powys)
≈11.7 km away
Local sunshine: ~918 kWh/kWp · -1% vs SY22
SY11 (Shropshire)
≈13.8 km away
Local sunshine: ~944 kWh/kWp · +2% vs SY22
SY15 (Powys)
≈22.7 km away
Local sunshine: ~938 kWh/kWp · +1% vs SY22
LL20 (Denbighshire)
≈22.8 km away
Local sunshine: ~877 kWh/kWp · -5% vs SY22
SY12 (Shropshire)
≈24.2 km away
Local sunshine: ~937 kWh/kWp · +1% vs SY22

Similar sunshine across the UK

TS23 (Stockton-on-Tees)
~926 kWh/kWp · +0% vs SY22
TF9 (Shropshire)
~926 kWh/kWp · +0% vs SY22
TS5 (Middlesbrough)
~925 kWh/kWp · -0% vs SY22