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Solar panel cost in Welwyn Hatfield (AL6)

See realistic solar installation costs, savings and payback for AL6 (Welwyn Hatfield) 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
9.9 years
After this, it's pure profit
Upfront Cost
£9,767
What you pay to get started
Annual Benefit
£990
What you save every year
Profit Over 25 Years
£14,995
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 Eastern, the current unit rate is 26.38p/kWh with a 53.94p/day standing charge. Your postcode’s south-facing sunshine yield is 997 kWh/kW — 12 below the regional median (1009).

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 997 kWh per year on a south-facing roof. We value self-used electricity at 26.4p and exported surplus at a baseline 10p via SEG. Use the calculator above for your exact tariff.

Unit rate
26.4p/kWh
Standing charge
53.9p/day
Sunshine yield (south)
997 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: £825, Upfront: £8,139, Break-even: 9.9 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1995 kWh 798 kWh 1197 kWh £210 £120 £330 £3,256 9.9 yrs £3,348
3 kW 2992 kWh 1197 kWh 1795 kWh £316 £180 £495 £4,883 9.9 yrs £5,021
4 kW 3989 kWh 1596 kWh 2394 kWh £421 £239 £660 £6,511 9.9 yrs £6,695
5 kW 4987 kWh 1995 kWh 2992 kWh £526 £299 £825 £8,139 9.9 yrs £8,369
6 kW 5984 kWh 2394 kWh 3590 kWh £631 £359 £990 £9,767 9.9 yrs £10,043
7 kW 6981 kWh 2793 kWh 4189 kWh £737 £419 £1,156 £11,394 9.9 yrs £11,717
8 kW 7979 kWh 3191 kWh 4787 kWh £842 £479 £1,321 £13,022 9.9 yrs £13,390

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: £989, Upfront: £10,239, Break-even: 10.4 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1995 kWh 1197 kWh 798 kWh £316 £80 £396 £5,356 13.5 yrs £2,555
3 kW 2992 kWh 1795 kWh 1197 kWh £474 £120 £593 £6,983 11.8 yrs £4,882
4 kW 3989 kWh 2394 kWh 1596 kWh £631 £160 £791 £8,611 10.9 yrs £7,209
5 kW 4987 kWh 2992 kWh 1995 kWh £789 £199 £989 £10,239 10.4 yrs £9,536
6 kW 5984 kWh 3590 kWh 2394 kWh £947 £239 £1,187 £11,867 10.0 yrs £11,864
7 kW 6981 kWh 4189 kWh 2793 kWh £1,105 £279 £1,384 £13,494 9.7 yrs £14,191
8 kW 7979 kWh 4787 kWh 3191 kWh £1,263 £319 £1,582 £15,122 9.6 yrs £16,518

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: £1,070, Upfront: £11,639, Break-even: 10.9 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1995 kWh 1396 kWh 598 kWh £368 £60 £428 £6,756 15.8 yrs £1,808
3 kW 2992 kWh 2094 kWh 898 kWh £553 £90 £642 £8,383 13.1 yrs £4,462
4 kW 3989 kWh 2793 kWh 1197 kWh £737 £120 £856 £10,011 11.7 yrs £7,116
5 kW 4987 kWh 3491 kWh 1496 kWh £921 £150 £1,070 £11,639 10.9 yrs £9,770
6 kW 5984 kWh 4189 kWh 1795 kWh £1,105 £180 £1,285 £13,267 10.3 yrs £12,424
7 kW 6981 kWh 4887 kWh 2094 kWh £1,289 £209 £1,499 £14,894 9.9 yrs £15,078
8 kW 7979 kWh 5585 kWh 2394 kWh £1,473 £239 £1,713 £16,522 9.6 yrs £17,732

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: £1,095, Upfront: £13,389, Break-even: 12.2 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1995 kWh 1456 kWh 539 kWh £384 £54 £438 £8,506 19.4 yrs £254
3 kW 2992 kWh 2184 kWh 808 kWh £576 £81 £657 £10,133 15.4 yrs £3,006
4 kW 3989 kWh 2912 kWh 1077 kWh £768 £108 £876 £11,761 13.4 yrs £5,758
5 kW 4987 kWh 3640 kWh 1346 kWh £960 £135 £1,095 £13,389 12.2 yrs £8,510
6 kW 5984 kWh 4368 kWh 1616 kWh £1,152 £162 £1,314 £15,017 11.4 yrs £11,262
7 kW 6981 kWh 5096 kWh 1885 kWh £1,344 £188 £1,533 £16,644 10.9 yrs £14,014
8 kW 7979 kWh 5824 kWh 2154 kWh £1,536 £215 £1,752 £18,272 10.4 yrs £16,766

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: £1,111, Upfront: £15,139, Break-even: 13.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1995 kWh 1496 kWh 499 kWh £395 £50 £445 £10,256 23.1 yrs £-1,365
3 kW 2992 kWh 2244 kWh 748 kWh £592 £75 £667 £11,883 17.8 yrs £1,452
4 kW 3989 kWh 2992 kWh 997 kWh £789 £100 £889 £13,511 15.2 yrs £4,269
5 kW 4987 kWh 3740 kWh 1247 kWh £987 £125 £1,111 £15,139 13.6 yrs £7,087
6 kW 5984 kWh 4488 kWh 1496 kWh £1,184 £150 £1,334 £16,767 12.6 yrs £9,904
7 kW 6981 kWh 5236 kWh 1745 kWh £1,381 £175 £1,556 £18,394 11.8 yrs £12,721
8 kW 7979 kWh 5984 kWh 1995 kWh £1,579 £199 £1,778 £20,022 11.3 yrs £15,539

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: £1,128, Upfront: £17,589, Break-even: 15.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1995 kWh 1536 kWh 459 kWh £405 £46 £451 £12,706 28.2 yrs £-3,685
3 kW 2992 kWh 2304 kWh 688 kWh £608 £69 £677 £14,333 21.2 yrs £-802
4 kW 3989 kWh 3072 kWh 918 kWh £810 £92 £902 £15,961 17.7 yrs £2,081
5 kW 4987 kWh 3840 kWh 1147 kWh £1,013 £115 £1,128 £17,589 15.6 yrs £4,963
6 kW 5984 kWh 4608 kWh 1376 kWh £1,216 £138 £1,353 £19,217 14.2 yrs £7,846
7 kW 6981 kWh 5376 kWh 1606 kWh £1,418 £161 £1,579 £20,844 13.2 yrs £10,729
8 kW 7979 kWh 6144 kWh 1835 kWh £1,621 £184 £1,804 £22,472 12.5 yrs £13,611

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 Welwyn Hatfield

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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Understand DNO, G98 and G99 export limits

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Insights for AL6

Figures below are tailored to AL6 — click through for full league tables.

Big-Roof Britain Rank #32 of 2182
7.2 kWp (UK avg 5.1 kWp)
~15 panels (≈430 W)
Solar Payback Index Rank #758 of 2996
9.9 years (UK avg 10.8 years)
~£990 /yr • £9,767 upfront
Standing-Charge Drag Rank #492 of 2996
19.9% (UK avg 26.6%) drag on savings
£197 fixed • ~£990 /yr value
Aspect Penalty View ranking →
East −21.7% West −19.6%
Typical output loss versus a south-facing roof (lower is better)

Seasonal solar output in AL6

Monthly generation per kilowatt of solar panels

kWh 39 Jan 53 Feb 86 Mar 111 Apr 119 May 120 Jun 121 Jul 110 Aug 94 Sep 67 Oct 46 Nov 33 Dec
Best month Worst month Winter (Dec–Feb) Other months

Winter output: 49.9% of an average month (Dec–Feb)

Best / worst month: Jul / Dec

These figures show output per kilowatt (kW) of panels installed. In winter, a 1 kW system here produces about 41 kWh per month; the average month produces around 83 kWh. So a typical 4 kW home system would generate roughly 166 kWh in winter, or 332 kWh in an average month.

Your Area at a Glance

Your Electricity Rate
26.38p/kWh
Daily Fixed Charge
53.94p/day
Local Sunshine
997kWh/kW
A 1 kW system generates ~997 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: 71% • Flats: 13% • Bungalows: 14% Based on 2,856 properties

Coverage

Welwyn Hatfield (81%)|East Hertfordshire (13%)|North Hertfordshire (7%)

Areas Covered

Welwyn West, Welwyn East, Hertford Rural, Peartree, Knebworth, Aston, Datchworth & Walkern, Codicote & Kimpton + 4 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 Eastern

AL8 (Welwyn Hatfield)
≈3.2 km away
Local sunshine: ~994 kWh/kWp · -0% vs AL6
AL7 (Welwyn Hatfield)
≈3.5 km away
Local sunshine: ~999 kWh/kWp · +0% vs AL6
SG3 (North Hertfordshire)
≈3.9 km away
Local sunshine: ~999 kWh/kWp · +0% vs AL6
SG2 (Stevenage)
≈7.5 km away
Local sunshine: ~998 kWh/kWp · +0% vs AL6
AL10 (Welwyn Hatfield)
≈7.8 km away
Local sunshine: ~991 kWh/kWp · -1% vs AL6
SG14 (East Hertfordshire)
≈8.5 km away
Local sunshine: ~996 kWh/kWp · -0% vs AL6

Similar sunshine across the UK

NN14 (North Northamptonshire)
~997 kWh/kWp · +0% vs AL6
HU19 (East Riding of Yorkshire)
~997 kWh/kWp · +0% vs AL6
KT2 (Kingston upon Thames)
~997 kWh/kWp · -0% vs AL6