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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in SY16 (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
£10,173
What you pay to get started
Annual Benefit
£786
What you save every year
Profit Over 25 Years
£9,472
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 920 kWh/kW — 10 below the regional median (930).

Read the full story

A typical roof here lands around 5.0 kW, with most eligible homes comfortably fitting within 3–6 kW. Each kilowatt of panels produces roughly 920 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)
920 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: £786, 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 1839 kWh 736 kWh 1104 kWh £204 £110 £314 £4,069 12.9 yrs £2,217
3 kW 2759 kWh 1104 kWh 1655 kWh £306 £166 £471 £6,104 12.9 yrs £3,326
4 kW 3679 kWh 1472 kWh 2207 kWh £408 £221 £629 £8,138 12.9 yrs £4,435
5 kW 4599 kWh 1839 kWh 2759 kWh £510 £276 £786 £10,173 12.9 yrs £5,543
6 kW 5518 kWh 2207 kWh 3311 kWh £612 £331 £943 £12,207 12.9 yrs £6,652
7 kW 6438 kWh 2575 kWh 3863 kWh £714 £386 £1,100 £14,242 12.9 yrs £7,761
8 kW 7358 kWh 2943 kWh 4415 kWh £816 £441 £1,257 £16,276 12.9 yrs £8,870

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: £949, 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 1839 kWh 1104 kWh 736 kWh £306 £74 £380 £6,169 16.3 yrs £1,421
3 kW 2759 kWh 1655 kWh 1104 kWh £459 £110 £569 £8,204 14.4 yrs £3,182
4 kW 3679 kWh 2207 kWh 1472 kWh £612 £147 £759 £10,238 13.5 yrs £4,942
5 kW 4599 kWh 2759 kWh 1839 kWh £765 £184 £949 £12,273 12.9 yrs £6,703
6 kW 5518 kWh 3311 kWh 2207 kWh £918 £221 £1,139 £14,307 12.6 yrs £8,463
7 kW 6438 kWh 3863 kWh 2575 kWh £1,071 £258 £1,328 £16,342 12.3 yrs £10,224
8 kW 7358 kWh 4415 kWh 2943 kWh £1,224 £294 £1,518 £18,376 12.1 yrs £11,985

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: £1,030, Upfront: £13,673, 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 1839 kWh 1288 kWh 552 kWh £357 £55 £412 £7,569 18.4 yrs £673
3 kW 2759 kWh 1931 kWh 828 kWh £535 £83 £618 £9,604 15.5 yrs £2,760
4 kW 3679 kWh 2575 kWh 1104 kWh £714 £110 £824 £11,638 14.1 yrs £4,846
5 kW 4599 kWh 3219 kWh 1380 kWh £892 £138 £1,030 £13,673 13.3 yrs £6,933
6 kW 5518 kWh 3863 kWh 1655 kWh £1,071 £166 £1,236 £15,707 12.7 yrs £9,019
7 kW 6438 kWh 4507 kWh 1931 kWh £1,249 £193 £1,442 £17,742 12.3 yrs £11,106
8 kW 7358 kWh 5150 kWh 2207 kWh £1,428 £221 £1,648 £19,776 12.0 yrs £13,192

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: £1,055, Upfront: £15,423, Break-even: 14.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1839 kWh 1343 kWh 497 kWh £372 £50 £422 £9,319 22.1 yrs £-881
3 kW 2759 kWh 2014 kWh 745 kWh £558 £74 £633 £11,354 17.9 yrs £1,303
4 kW 3679 kWh 2686 kWh 993 kWh £744 £99 £844 £13,388 15.9 yrs £3,487
5 kW 4599 kWh 3357 kWh 1242 kWh £931 £124 £1,055 £15,423 14.6 yrs £5,672
6 kW 5518 kWh 4028 kWh 1490 kWh £1,117 £149 £1,266 £17,457 13.8 yrs £7,856
7 kW 6438 kWh 4700 kWh 1738 kWh £1,303 £174 £1,477 £19,492 13.2 yrs £10,040
8 kW 7358 kWh 5371 kWh 1987 kWh £1,489 £199 £1,688 £21,526 12.8 yrs £12,224

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: £1,071, Upfront: £17,173, Break-even: 16.0 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1839 kWh 1380 kWh 460 kWh £382 £46 £428 £11,069 25.8 yrs £-2,501
3 kW 2759 kWh 2069 kWh 690 kWh £574 £69 £643 £13,104 20.4 yrs £-252
4 kW 3679 kWh 2759 kWh 920 kWh £765 £92 £857 £15,138 17.7 yrs £1,998
5 kW 4599 kWh 3449 kWh 1150 kWh £956 £115 £1,071 £17,173 16.0 yrs £4,247
6 kW 5518 kWh 4139 kWh 1380 kWh £1,147 £138 £1,285 £19,207 14.9 yrs £6,497
7 kW 6438 kWh 4828 kWh 1609 kWh £1,338 £161 £1,499 £21,242 14.2 yrs £8,746
8 kW 7358 kWh 5518 kWh 1839 kWh £1,530 £184 £1,714 £23,276 13.6 yrs £10,996

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: £1,087, Upfront: £19,623, Break-even: 18.0 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1839 kWh 1416 kWh 423 kWh £393 £42 £435 £13,519 31.1 yrs £-4,821
3 kW 2759 kWh 2125 kWh 635 kWh £589 £63 £652 £15,554 23.8 yrs £-2,506
4 kW 3679 kWh 2833 kWh 846 kWh £785 £85 £870 £17,588 20.2 yrs £-191
5 kW 4599 kWh 3541 kWh 1058 kWh £982 £106 £1,087 £19,623 18.0 yrs £2,123
6 kW 5518 kWh 4249 kWh 1269 kWh £1,178 £127 £1,305 £21,657 16.6 yrs £4,438
7 kW 6438 kWh 4957 kWh 1481 kWh £1,374 £148 £1,522 £23,692 15.6 yrs £6,753
8 kW 7358 kWh 5665 kWh 1692 kWh £1,570 £169 £1,740 £25,726 14.8 yrs £9,068

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 SY16

Figures below are tailored to SY16 — click through for full league tables.

Big-Roof Britain Rank #866 of 2182
5.2 kWp (UK avg 5.1 kWp)
~11 panels (≈430 W)
Solar Payback Index Rank #1555 of 2997
11.2 years (UK avg 11.3 years)
~£908 /yr • £10,173 upfront
Standing-Charge Drag Rank #2570 of 2997
28.1% (UK avg 21.7%) drag on savings
£255 fixed • ~£908 /yr value

Your Area at a Glance

Your Electricity Rate
27.72p/kWh
Daily Fixed Charge
69.95p/day
Local Sunshine
920kWh/kW
A 1 kW system generates ~920 kWh per year. A typical home uses ~2,700 kWh per year.
Typical System Size
5.0kW
For houses & bungalows in this area

Local Property Data

Property Types

Houses: 69% • Flats: 18% • Bungalows: 12% Based on 4,574 properties

Coverage

Powys (100%)

Areas Covered

Newtown East, Newtown Central and South, Rhiwcynon, Kerry, Newtown West, Newtown North, Llandinam with Dolfor, Dolforwyn + 2 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

SY17 (Powys)
≈8.6 km away
Local sunshine: ~890 kWh/kWp · -3% vs SY16
SY15 (Powys)
≈12.5 km away
Local sunshine: ~938 kWh/kWp · +2% vs SY16
SY18 (Powys)
≈16.9 km away
Local sunshine: ~888 kWh/kWp · -3% vs SY16
SY21 (Powys)
≈19.7 km away
Local sunshine: ~918 kWh/kWp · -0% vs SY16
SY19 (Powys)
≈23.2 km away
Local sunshine: ~892 kWh/kWp · -3% vs SY16
SY22 (Powys)
≈29.5 km away
Local sunshine: ~926 kWh/kWp · +1% vs SY16

Similar sunshine across the UK

S3 (Sheffield)
~920 kWh/kWp · +0% vs SY16
ST17 (Stafford)
~920 kWh/kWp · +0% vs SY16
CA28 (Cumberland)
~920 kWh/kWp · +0% vs SY16