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Solar panel cost in Torfaen (NP4)

See realistic solar installation costs, savings and payback for NP4 (Torfaen) 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
13.7 years
After this, it's pure profit
Upfront Cost
£10,173
What you pay to get started
Annual Benefit
£740
What you save every year
Profit Over 25 Years
£8,329
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 23.31p/kWh with a 56.85p/day standing charge. Your postcode’s south-facing sunshine yield is 966 kWh/kW — 3 below the regional median (968).

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 966 kWh per year on a south-facing roof. We value self-used electricity at 23.3p and exported surplus at a baseline 10p via SEG. Use the calculator above for your exact tariff.

Unit rate
23.3p/kWh
Standing charge
56.9p/day
Sunshine yield (south)
966 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: £740, Upfront: £10,173, Break-even: 13.7 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1932 kWh 773 kWh 1159 kWh £180 £116 £296 £4,069 13.7 yrs £1,851
3 kW 2898 kWh 1159 kWh 1739 kWh £270 £174 £444 £6,104 13.7 yrs £2,777
4 kW 3864 kWh 1545 kWh 2318 kWh £360 £232 £592 £8,138 13.7 yrs £3,703
5 kW 4829 kWh 1932 kWh 2898 kWh £450 £290 £740 £10,173 13.7 yrs £4,629
6 kW 5795 kWh 2318 kWh 3477 kWh £540 £348 £888 £12,207 13.7 yrs £5,554
7 kW 6761 kWh 2704 kWh 4057 kWh £630 £406 £1,036 £14,242 13.7 yrs £6,480
8 kW 7727 kWh 3091 kWh 4636 kWh £720 £464 £1,184 £16,276 13.7 yrs £7,406

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: £869, Upfront: £12,273, Break-even: 14.1 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1932 kWh 1159 kWh 773 kWh £270 £77 £347 £6,169 17.8 yrs £780
3 kW 2898 kWh 1739 kWh 1159 kWh £405 £116 £521 £8,204 15.7 yrs £2,220
4 kW 3864 kWh 2318 kWh 1545 kWh £540 £155 £695 £10,238 14.7 yrs £3,660
5 kW 4829 kWh 2898 kWh 1932 kWh £675 £193 £869 £12,273 14.1 yrs £5,100
6 kW 5795 kWh 3477 kWh 2318 kWh £811 £232 £1,042 £14,307 13.7 yrs £6,540
7 kW 6761 kWh 4057 kWh 2704 kWh £946 £270 £1,216 £16,342 13.4 yrs £7,980
8 kW 7727 kWh 4636 kWh 3091 kWh £1,081 £309 £1,390 £18,376 13.2 yrs £9,420

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: £933, Upfront: £13,673, Break-even: 14.7 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1932 kWh 1352 kWh 580 kWh £315 £58 £373 £7,569 20.3 yrs £-106
3 kW 2898 kWh 2028 kWh 869 kWh £473 £87 £560 £9,604 17.2 yrs £1,591
4 kW 3864 kWh 2704 kWh 1159 kWh £630 £116 £746 £11,638 15.6 yrs £3,288
5 kW 4829 kWh 3381 kWh 1449 kWh £788 £145 £933 £13,673 14.7 yrs £4,986
6 kW 5795 kWh 4057 kWh 1739 kWh £946 £174 £1,119 £15,707 14.0 yrs £6,683
7 kW 6761 kWh 4733 kWh 2028 kWh £1,103 £203 £1,306 £17,742 13.6 yrs £8,380
8 kW 7727 kWh 5409 kWh 2318 kWh £1,261 £232 £1,493 £19,776 13.2 yrs £10,077

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: £952, Upfront: £15,423, Break-even: 16.2 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1932 kWh 1410 kWh 522 kWh £329 £52 £381 £9,319 24.5 yrs £-1,702
3 kW 2898 kWh 2115 kWh 782 kWh £493 £78 £571 £11,354 19.9 yrs £73
4 kW 3864 kWh 2820 kWh 1043 kWh £657 £104 £762 £13,388 17.6 yrs £1,847
5 kW 4829 kWh 3525 kWh 1304 kWh £822 £130 £952 £15,423 16.2 yrs £3,621
6 kW 5795 kWh 4231 kWh 1565 kWh £986 £156 £1,143 £17,457 15.3 yrs £5,395
7 kW 6761 kWh 4936 kWh 1826 kWh £1,151 £183 £1,333 £19,492 14.6 yrs £7,170
8 kW 7727 kWh 5641 kWh 2086 kWh £1,315 £209 £1,524 £21,526 14.1 yrs £8,944

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: £965, Upfront: £17,173, Break-even: 17.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1932 kWh 1449 kWh 483 kWh £338 £48 £386 £11,069 28.7 yrs £-3,349
3 kW 2898 kWh 2173 kWh 724 kWh £507 £72 £579 £13,104 22.6 yrs £-1,523
4 kW 3864 kWh 2898 kWh 966 kWh £675 £97 £772 £15,138 19.6 yrs £303
5 kW 4829 kWh 3622 kWh 1207 kWh £844 £121 £965 £17,173 17.8 yrs £2,128
6 kW 5795 kWh 4347 kWh 1449 kWh £1,013 £145 £1,158 £19,207 16.6 yrs £3,954
7 kW 6761 kWh 5071 kWh 1690 kWh £1,182 £169 £1,351 £21,242 15.7 yrs £5,780
8 kW 7727 kWh 5795 kWh 1932 kWh £1,351 £193 £1,544 £23,276 15.1 yrs £7,605

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: £978, Upfront: £19,623, Break-even: 20.1 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1932 kWh 1487 kWh 444 kWh £347 £44 £391 £13,519 34.6 yrs £-5,696
3 kW 2898 kWh 2231 kWh 666 kWh £520 £67 £587 £15,554 26.5 yrs £-3,819
4 kW 3864 kWh 2975 kWh 889 kWh £693 £89 £782 £17,588 22.5 yrs £-1,942
5 kW 4829 kWh 3719 kWh 1111 kWh £867 £111 £978 £19,623 20.1 yrs £-65
6 kW 5795 kWh 4462 kWh 1333 kWh £1,040 £133 £1,173 £21,657 18.5 yrs £1,813
7 kW 6761 kWh 5206 kWh 1555 kWh £1,214 £156 £1,369 £23,692 17.3 yrs £3,690
8 kW 7727 kWh 5950 kWh 1777 kWh £1,387 £178 £1,565 £25,726 16.4 yrs £5,567

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 NP4

Figures below are tailored to NP4 — click through for full league tables.

Big-Roof Britain Rank #1210 of 2182
4.9 kWp (UK avg 5.1 kWp)
~10 panels (≈430 W)
Solar Payback Index Rank #1248 of 2997
12.2 years (UK avg 12.6 years)
~£834 /yr • £10,173 upfront
Standing-Charge Drag Rank #1488 of 2997
23.1% (UK avg 24.6%) drag on savings
£193 fixed • ~£834 /yr value
Aspect Penalty View ranking →
East −19.8% West −19.9%
Typical output loss versus a south-facing roof (lower is better)

Seasonal solar output in NP4

Monthly generation per kilowatt of solar panels

kWh 36 Jan 50 Feb 83 Mar 111 Apr 120 May 119 Jun 120 Jul 104 Aug 90 Sep 61 Oct 41 Nov 31 Dec
Best month Worst month Winter (Dec–Feb) Other months

Winter output: 48.5% 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 39 kWh per month; the average month produces around 80 kWh. So a typical 4 kW home system would generate roughly 156 kWh in winter, or 322 kWh in an average month.

Your Area at a Glance

Your Electricity Rate
23.31p/kWh
Daily Fixed Charge
56.85p/day
Local Sunshine
966kWh/kW
A 1 kW system generates ~966 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: 72% • Flats: 20% • Bungalows: 7% Based on 10,518 properties

Coverage

Torfaen (95%)|Monmouthshire (5%)

Areas Covered

Pontypool Fawr, Pontnewynydd and Snatchwood, Abersychan, Pontnewydd, Llanfrechfa and Ponthir, New Inn, Blaenavon, Fairwater + 4 more

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 South Wales

NP44 (Torfaen)
≈4.9 km away
Local sunshine: ~971 kWh/kWp · +1% vs NP4
NP13 (Blaenau Gwent)
≈8.0 km away
Local sunshine: ~933 kWh/kWp · -3% vs NP4
NP11 (Caerphilly)
≈8.6 km away
Local sunshine: ~930 kWh/kWp · -4% vs NP4
NP15 (Monmouthshire)
≈9.6 km away
Local sunshine: ~964 kWh/kWp · -0% vs NP4
NP18 (Newport)
≈11.2 km away
Local sunshine: ~997 kWh/kWp · +3% vs NP4
NP12 (Caerphilly)
≈11.3 km away
Local sunshine: ~926 kWh/kWp · -4% vs NP4

Similar sunshine across the UK

WR3 (Worcester)
~966 kWh/kWp · -0% vs NP4
LL77 (Isle of Anglesey)
~966 kWh/kWp · -0% vs NP4
LE87 (Leicester)
~966 kWh/kWp · +0% vs NP4