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Solar panel cost in Powys (SY15)

See realistic solar installation costs, savings and payback for SY15 (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
10.2 years
After this, it's pure profit
Upfront Cost
£9,767
What you pay to get started
Annual Benefit
£961
What you save every year
Profit Over 25 Years
£14,249
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: The official cost per kW is lower above 4 kW, so a 5–6 kW system can pay back a little faster than a 3–4 kW system on otherwise identical assumptions.
  • 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

Panel costs: Uses March 2026 TIC mean installation costs: £1,827/kW up to 4 kW and £1,628/kW above 4 kW.

Other costs: Battery prices are modelled at £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 27.66p/kWh with a 70.76p/day standing charge. Your postcode’s south-facing sunshine yield is 938 kWh/kW — 8 above 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 938 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
70.8p/day
Sunshine yield (south)
938 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: £801, Upfront: £8,139, Break-even: 10.2 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1877 kWh 751 kWh 1126 kWh £208 £113 £320 £3,256 10.2 yrs £3,149
3 kW 2815 kWh 1126 kWh 1689 kWh £311 £169 £480 £4,883 10.2 yrs £4,723
4 kW 3753 kWh 1501 kWh 2252 kWh £415 £225 £640 £6,511 10.2 yrs £6,297
5 kW 4691 kWh 1877 kWh 2815 kWh £519 £281 £801 £8,139 10.2 yrs £7,872
6 kW 5630 kWh 2252 kWh 3378 kWh £623 £338 £961 £9,767 10.2 yrs £9,446
7 kW 6568 kWh 2627 kWh 3941 kWh £727 £394 £1,121 £11,394 10.2 yrs £11,020
8 kW 7506 kWh 3002 kWh 4504 kWh £830 £450 £1,281 £13,022 10.2 yrs £12,595

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,628, battery £/kWh = 700.

3 kWh battery 5 kW example → Annual benefit: £966, Upfront: £10,239, Break-even: 10.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1877 kWh 1126 kWh 751 kWh £311 £75 £386 £5,356 13.9 yrs £2,374
3 kW 2815 kWh 1689 kWh 1126 kWh £467 £113 £580 £6,983 12.0 yrs £4,611
4 kW 3753 kWh 2252 kWh 1501 kWh £623 £150 £773 £8,611 11.1 yrs £6,848
5 kW 4691 kWh 2815 kWh 1877 kWh £779 £188 £966 £10,239 10.6 yrs £9,086
6 kW 5630 kWh 3378 kWh 2252 kWh £934 £225 £1,159 £11,867 10.2 yrs £11,323
7 kW 6568 kWh 3941 kWh 2627 kWh £1,090 £263 £1,353 £13,494 10.0 yrs £13,560
8 kW 7506 kWh 4504 kWh 3002 kWh £1,246 £300 £1,546 £15,122 9.8 yrs £15,797

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,628, battery £/kWh = 700.

5 kWh battery 5 kW example → Annual benefit: £1,049, Upfront: £11,639, Break-even: 11.1 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1877 kWh 1314 kWh 563 kWh £363 £56 £420 £6,756 16.1 yrs £1,637
3 kW 2815 kWh 1970 kWh 844 kWh £545 £84 £629 £8,383 13.3 yrs £4,206
4 kW 3753 kWh 2627 kWh 1126 kWh £727 £113 £839 £10,011 11.9 yrs £6,774
5 kW 4691 kWh 3284 kWh 1407 kWh £908 £141 £1,049 £11,639 11.1 yrs £9,343
6 kW 5630 kWh 3941 kWh 1689 kWh £1,090 £169 £1,259 £13,267 10.5 yrs £11,911
7 kW 6568 kWh 4597 kWh 1970 kWh £1,272 £197 £1,469 £14,894 10.1 yrs £14,480
8 kW 7506 kWh 5254 kWh 2252 kWh £1,453 £225 £1,679 £16,522 9.8 yrs £17,048

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,628, battery £/kWh = 700.

7.5 kWh battery 5 kW example → Annual benefit: £1,074, Upfront: £13,389, Break-even: 12.5 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1877 kWh 1370 kWh 507 kWh £379 £51 £430 £8,506 19.8 yrs £86
3 kW 2815 kWh 2055 kWh 760 kWh £568 £76 £644 £10,133 15.7 yrs £2,754
4 kW 3753 kWh 2740 kWh 1013 kWh £758 £101 £859 £11,761 13.7 yrs £5,422
5 kW 4691 kWh 3425 kWh 1267 kWh £947 £127 £1,074 £13,389 12.5 yrs £8,090
6 kW 5630 kWh 4110 kWh 1520 kWh £1,137 £152 £1,289 £15,017 11.7 yrs £10,758
7 kW 6568 kWh 4795 kWh 1773 kWh £1,326 £177 £1,503 £16,644 11.1 yrs £13,426
8 kW 7506 kWh 5479 kWh 2027 kWh £1,516 £203 £1,718 £18,272 10.6 yrs £16,093

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,628, battery £/kWh = 700.

10 kWh battery 5 kW example → Annual benefit: £1,090, Upfront: £15,139, Break-even: 13.9 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1877 kWh 1407 kWh 469 kWh £389 £47 £436 £10,256 23.5 yrs £-1,532
3 kW 2815 kWh 2111 kWh 704 kWh £584 £70 £654 £11,883 18.2 yrs £1,203
4 kW 3753 kWh 2815 kWh 938 kWh £779 £94 £872 £13,511 15.5 yrs £3,937
5 kW 4691 kWh 3518 kWh 1173 kWh £973 £117 £1,090 £15,139 13.9 yrs £6,671
6 kW 5630 kWh 4222 kWh 1407 kWh £1,168 £141 £1,309 £16,767 12.8 yrs £9,405
7 kW 6568 kWh 4926 kWh 1642 kWh £1,362 £164 £1,527 £18,394 12.0 yrs £12,139
8 kW 7506 kWh 5630 kWh 1877 kWh £1,557 £188 £1,745 £20,022 11.5 yrs £14,874

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,628, battery £/kWh = 700.

13.5 kWh battery 5 kW example → Annual benefit: £1,107, Upfront: £17,589, 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 1877 kWh 1445 kWh 432 kWh £400 £43 £443 £12,706 28.7 yrs £-3,849
3 kW 2815 kWh 2167 kWh 647 kWh £599 £65 £664 £14,333 21.6 yrs £-1,049
4 kW 3753 kWh 2890 kWh 863 kWh £799 £86 £886 £15,961 18.0 yrs £1,752
5 kW 4691 kWh 3612 kWh 1079 kWh £999 £108 £1,107 £17,589 15.9 yrs £4,552
6 kW 5630 kWh 4335 kWh 1295 kWh £1,199 £129 £1,328 £19,217 14.5 yrs £7,353
7 kW 6568 kWh 5057 kWh 1511 kWh £1,399 £151 £1,550 £20,844 13.4 yrs £10,153
8 kW 7506 kWh 5780 kWh 1726 kWh £1,599 £173 £1,771 £22,472 12.7 yrs £12,954

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,628, 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.

Before you request quotes in Powys

Use the numbers above to sanity-check installer quotes. The main things to compare are system size, battery assumptions, payback claims, MCS certification, DNO paperwork and export assumptions.

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Check what MCS certification means

Understand DNO, G98 and G99 export limits

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This is a practical sanity-check request, not an instant quote promise. The Blue Ape quote route above remains available if you already want installer introductions.

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Insights for SY15

Figures below are tailored to SY15 — click through for full league tables.

Big-Roof Britain Rank #120 of 2182
6.5 kWp (UK avg 5.1 kWp)
~14 panels (≈430 W)
Solar Payback Index Rank #1331 of 2996
10.2 years (UK avg 10.8 years)
~£960 /yr • £9,767 upfront
Standing-Charge Drag Rank #1724 of 2996
26.9% (UK avg 26.6%) drag on savings
£258 fixed • ~£960 /yr value
Aspect Penalty View ranking →
East −19.5% West −19.7%
Typical output loss versus a south-facing roof (lower is better)

Seasonal solar output in SY15

Monthly generation per kilowatt of solar panels

kWh 33 Jan 48 Feb 82 Mar 109 Apr 118 May 116 Jun 115 Jul 102 Aug 87 Sep 60 Oct 40 Nov 29 Dec
Best month Worst month Winter (Dec–Feb) Other months

Winter output: 46.9% 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 37 kWh per month; the average month produces around 78 kWh. So a typical 4 kW home system would generate roughly 147 kWh in winter, or 313 kWh in an average month.

Your Area at a Glance

Your Electricity Rate
27.66p/kWh
Daily Fixed Charge
70.76p/day
Local Sunshine
938kWh/kW
A 1 kW system generates ~938 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: 80% • Flats: 2% • Bungalows: 18% Based on 1,378 properties

Coverage

Powys (84%)|Shropshire (16%)

Areas Covered

Forden and Montgomery, Churchstoke, Dolforwyn, Chirbury & Worthen, Berriew and Castle Caereinion, Welshpool Gungrog, Bishop's Castle, Clun + 1 more

Data Sources & Assumptions

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

Electricity rates: Ofgem price cap, Q3 2026

Installation costs: DESNZ/MCS data, March 2026 (TIC)

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

SY21 (Powys)
≈11.1 km away
Local sunshine: ~918 kWh/kWp · -2% vs SY15
SY16 (Powys)
≈12.5 km away
Local sunshine: ~920 kWh/kWp · -2% vs SY15
SY17 (Powys)
≈20.7 km away
Local sunshine: ~890 kWh/kWp · -5% vs SY15
SY22 (Powys)
≈22.7 km away
Local sunshine: ~926 kWh/kWp · -1% vs SY15
SY18 (Powys)
≈29.4 km away
Local sunshine: ~888 kWh/kWp · -5% vs SY15
SY10 (Shropshire)
≈31.8 km away
Local sunshine: ~929 kWh/kWp · -1% vs SY15

Similar sunshine across the UK

B30 (Birmingham)
~938 kWh/kWp · +0% vs SY15
TF11 (Shropshire)
~938 kWh/kWp · -0% vs SY15
YO61 (North Yorkshire)
~938 kWh/kWp · +0% vs SY15