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Solar panel cost in Powys (SY20)

See realistic solar installation costs, savings and payback for SY20 (Powys) in under a minute using official UK data. Start with the calculator, then get a no-obligation quote from an MCS-certified installer. You can also ask the SolarByPostcode assistant to sanity-check your roof, bills and plans.

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
15.8 years
After this, it's pure profit
Upfront Cost
£12,207
What you pay to get started
Annual Benefit
£773
What you save every year
Profit Over 25 Years
£7,115
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 24.43p/kWh with a 69.98p/day standing charge. Your postcode’s south-facing sunshine yield is 817 kWh/kW — 113 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 817 kWh per year on a south-facing roof. We value self-used electricity at 24.4p and exported surplus at a baseline 10p via SEG. Use the calculator above for your exact tariff.

Unit rate
24.4p/kWh
Standing charge
70.0p/day
Sunshine yield (south)
817 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: £644, Upfront: £10,173, Break-even: 15.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1633 kWh 653 kWh 980 kWh £160 £98 £258 £4,069 15.8 yrs £1,084
3 kW 2450 kWh 980 kWh 1470 kWh £239 £147 £386 £6,104 15.8 yrs £1,625
4 kW 3267 kWh 1307 kWh 1960 kWh £319 £196 £515 £8,138 15.8 yrs £2,167
5 kW 4084 kWh 1633 kWh 2450 kWh £399 £245 £644 £10,173 15.8 yrs £2,709
6 kW 4900 kWh 1960 kWh 2940 kWh £479 £294 £773 £12,207 15.8 yrs £3,251
7 kW 5717 kWh 2287 kWh 3430 kWh £559 £343 £902 £14,242 15.8 yrs £3,792
8 kW 6534 kWh 2614 kWh 3920 kWh £638 £392 £1,031 £16,276 15.8 yrs £4,334

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: £762, Upfront: £12,273, Break-even: 16.1 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1633 kWh 980 kWh 653 kWh £239 £65 £305 £6,169 20.2 yrs £-74
3 kW 2450 kWh 1470 kWh 980 kWh £359 £98 £457 £8,204 17.9 yrs £939
4 kW 3267 kWh 1960 kWh 1307 kWh £479 £131 £610 £10,238 16.8 yrs £1,953
5 kW 4084 kWh 2450 kWh 1633 kWh £599 £163 £762 £12,273 16.1 yrs £2,966
6 kW 4900 kWh 2940 kWh 1960 kWh £718 £196 £914 £14,307 15.6 yrs £3,979
7 kW 5717 kWh 3430 kWh 2287 kWh £838 £229 £1,067 £16,342 15.3 yrs £4,992
8 kW 6534 kWh 3920 kWh 2614 kWh £958 £261 £1,219 £18,376 15.1 yrs £6,005

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: £821, Upfront: £13,673, Break-even: 16.7 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1633 kWh 1143 kWh 490 kWh £279 £49 £328 £7,569 23.1 yrs £-1,002
3 kW 2450 kWh 1715 kWh 735 kWh £419 £74 £493 £9,604 19.5 yrs £247
4 kW 3267 kWh 2287 kWh 980 kWh £559 £98 £657 £11,638 17.7 yrs £1,495
5 kW 4084 kWh 2859 kWh 1225 kWh £698 £123 £821 £13,673 16.7 yrs £2,744
6 kW 4900 kWh 3430 kWh 1470 kWh £838 £147 £985 £15,707 15.9 yrs £3,993
7 kW 5717 kWh 4002 kWh 1715 kWh £978 £172 £1,149 £17,742 15.4 yrs £5,242
8 kW 6534 kWh 4574 kWh 1960 kWh £1,117 £196 £1,313 £19,776 15.1 yrs £6,491

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: £839, Upfront: £15,423, Break-even: 18.4 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1633 kWh 1192 kWh 441 kWh £291 £44 £335 £9,319 27.8 yrs £-2,611
3 kW 2450 kWh 1789 kWh 662 kWh £437 £66 £503 £11,354 22.6 yrs £-1,291
4 kW 3267 kWh 2385 kWh 882 kWh £583 £88 £671 £13,388 20.0 yrs £28
5 kW 4084 kWh 2981 kWh 1103 kWh £728 £110 £839 £15,423 18.4 yrs £1,348
6 kW 4900 kWh 3577 kWh 1323 kWh £874 £132 £1,006 £17,457 17.3 yrs £2,667
7 kW 5717 kWh 4173 kWh 1544 kWh £1,020 £154 £1,174 £19,492 16.6 yrs £3,987
8 kW 6534 kWh 4770 kWh 1764 kWh £1,165 £176 £1,342 £21,526 16.0 yrs £5,307

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: £850, Upfront: £17,173, 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 1633 kWh 1225 kWh 408 kWh £299 £41 £340 £11,069 32.5 yrs £-4,267
3 kW 2450 kWh 1838 kWh 613 kWh £449 £61 £510 £13,104 25.7 yrs £-2,900
4 kW 3267 kWh 2450 kWh 817 kWh £599 £82 £680 £15,138 22.3 yrs £-1,533
5 kW 4084 kWh 3063 kWh 1021 kWh £748 £102 £850 £17,173 20.2 yrs £-166
6 kW 4900 kWh 3675 kWh 1225 kWh £898 £123 £1,020 £19,207 18.8 yrs £1,200
7 kW 5717 kWh 4288 kWh 1429 kWh £1,048 £143 £1,190 £21,242 17.8 yrs £2,567
8 kW 6534 kWh 4900 kWh 1633 kWh £1,197 £163 £1,360 £23,276 17.1 yrs £3,934

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: £862, Upfront: £19,623, Break-even: 22.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1633 kWh 1258 kWh 376 kWh £307 £38 £345 £13,519 39.2 yrs £-6,622
3 kW 2450 kWh 1887 kWh 564 kWh £461 £56 £517 £15,554 30.1 yrs £-5,208
4 kW 3267 kWh 2515 kWh 751 kWh £615 £75 £690 £17,588 25.5 yrs £-3,795
5 kW 4084 kWh 3144 kWh 939 kWh £768 £94 £862 £19,623 22.8 yrs £-2,381
6 kW 4900 kWh 3773 kWh 1127 kWh £922 £113 £1,035 £21,657 20.9 yrs £-967
7 kW 5717 kWh 4402 kWh 1315 kWh £1,075 £131 £1,207 £23,692 19.6 yrs £447
8 kW 6534 kWh 5031 kWh 1503 kWh £1,229 £150 £1,379 £25,726 18.7 yrs £1,861

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 SY20

Figures below are tailored to SY20 — click through for full league tables.

Big-Roof Britain Rank #586 of 2182
5.5 kWp (UK avg 5.1 kWp)
~12 panels (≈430 W)
Solar Payback Index Rank #2703 of 2997
14.1 years (UK avg 12.6 years)
~£864 /yr • £12,207 upfront
Standing-Charge Drag Rank #2399 of 2997
30.0% (UK avg 24.6%) drag on savings
£259 fixed • ~£864 /yr value
Aspect Penalty View ranking →
East −16.0% West −18.3%
Typical output loss versus a south-facing roof (lower is better)

Seasonal solar output in SY20

Monthly generation per kilowatt of solar panels

kWh 23 Jan 39 Feb 72 Mar 101 Apr 111 May 106 Jun 102 Jul 89 Aug 75 Sep 50 Oct 30 Nov 18 Dec
Best month Worst month Winter (Dec–Feb) Other months

Winter output: 38.9% of an average month (Dec–Feb)

Best / worst month: May / Dec

These figures show output per kilowatt (kW) of panels installed. In winter, a 1 kW system here produces about 26 kWh per month; the average month produces around 68 kWh. So a typical 4 kW home system would generate roughly 106 kWh in winter, or 272 kWh in an average month.

Your Area at a Glance

Your Electricity Rate
24.43p/kWh
Daily Fixed Charge
69.98p/day
Local Sunshine
817kWh/kW
A 1 kW system generates ~817 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: 76% • Flats: 9% • Bungalows: 14% Based on 1,866 properties

Coverage

Powys (62%)|Gwynedd (30%)|Ceredigion (8%)

Areas Covered

Machynlleth, Glantwymyn, Corris a Mawddwy, Ceulan a Maesmawr, Aberdyfi, Llanbrynmair

Data Sources & Assumptions

Solar yield: PVGIS (EU Joint Research Centre), January 2025 data

Electricity rates: Ofgem price cap, Q1 2026

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

SY19 (Powys)
≈13.9 km away
Local sunshine: ~892 kWh/kWp · +9% vs SY20
LL35 (Gwynedd)
≈14.6 km away
Local sunshine: ~877 kWh/kWp · +7% vs SY20
LL36 (Gwynedd)
≈16.2 km away
Local sunshine: ~940 kWh/kWp · +15% vs SY20
LL40 (Gwynedd)
≈17.0 km away
Local sunshine: ~805 kWh/kWp · -1% vs SY20
LL39 (Gwynedd)
≈17.3 km away
Local sunshine: ~825 kWh/kWp · +1% vs SY20
SY24 (Ceredigion)
≈17.8 km away
Local sunshine: ~880 kWh/kWp · +8% vs SY20

Similar sunshine across the UK

G67 (North Lanarkshire)
~817 kWh/kWp · +0% vs SY20
G70 (North Lanarkshire)
~817 kWh/kWp · +0% vs SY20
LA10 (Westmorland and Furness)
~816 kWh/kWp · -0% vs SY20