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Solar panel cost in East Hertfordshire (SG12)

See realistic solar installation costs, savings and payback for SG12 (East Hertfordshire) 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
9.8 years
After this, it's pure profit
Upfront Cost
£8,139
What you pay to get started
Annual Benefit
£829
What you save every year
Profit Over 25 Years
£12,584
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 1002 kWh/kW — 8 below the regional median (1009).

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 1002 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)
1002 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: £829, Upfront: £8,139, Break-even: 9.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2003 kWh 801 kWh 1202 kWh £211 £120 £332 £3,256 9.8 yrs £3,376
3 kW 3005 kWh 1202 kWh 1803 kWh £317 £180 £497 £4,883 9.8 yrs £5,064
4 kW 4006 kWh 1603 kWh 2404 kWh £423 £240 £663 £6,511 9.8 yrs £6,751
5 kW 5008 kWh 2003 kWh 3005 kWh £528 £300 £829 £8,139 9.8 yrs £8,439
6 kW 6009 kWh 2404 kWh 3606 kWh £634 £361 £995 £9,767 9.8 yrs £10,127
7 kW 7011 kWh 2804 kWh 4207 kWh £740 £421 £1,160 £11,394 9.8 yrs £11,815
8 kW 8013 kWh 3205 kWh 4808 kWh £845 £481 £1,326 £13,022 9.8 yrs £13,503

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: £993, Upfront: £10,239, Break-even: 10.3 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2003 kWh 1202 kWh 801 kWh £317 £80 £397 £5,356 13.5 yrs £2,588
3 kW 3005 kWh 1803 kWh 1202 kWh £476 £120 £596 £6,983 11.7 yrs £4,932
4 kW 4006 kWh 2404 kWh 1603 kWh £634 £160 £794 £8,611 10.8 yrs £7,276
5 kW 5008 kWh 3005 kWh 2003 kWh £793 £200 £993 £10,239 10.3 yrs £9,620
6 kW 6009 kWh 3606 kWh 2404 kWh £951 £240 £1,192 £11,867 10.0 yrs £11,964
7 kW 7011 kWh 4207 kWh 2804 kWh £1,110 £280 £1,390 £13,494 9.7 yrs £14,308
8 kW 8013 kWh 4808 kWh 3205 kWh £1,268 £321 £1,589 £15,122 9.5 yrs £16,653

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: £1,075, Upfront: £11,639, Break-even: 10.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2003 kWh 1402 kWh 601 kWh £370 £60 £430 £6,756 15.7 yrs £1,844
3 kW 3005 kWh 2103 kWh 901 kWh £555 £90 £645 £8,383 13.0 yrs £4,517
4 kW 4006 kWh 2804 kWh 1202 kWh £740 £120 £860 £10,011 11.6 yrs £7,189
5 kW 5008 kWh 3505 kWh 1502 kWh £925 £150 £1,075 £11,639 10.8 yrs £9,861
6 kW 6009 kWh 4207 kWh 1803 kWh £1,110 £180 £1,290 £13,267 10.3 yrs £12,533
7 kW 7011 kWh 4908 kWh 2103 kWh £1,295 £210 £1,505 £14,894 9.9 yrs £15,205
8 kW 8013 kWh 5609 kWh 2404 kWh £1,480 £240 £1,720 £16,522 9.6 yrs £17,877

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: £1,100, 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 2003 kWh 1462 kWh 541 kWh £386 £54 £440 £8,506 19.3 yrs £291
3 kW 3005 kWh 2193 kWh 811 kWh £579 £81 £660 £10,133 15.4 yrs £3,062
4 kW 4006 kWh 2925 kWh 1082 kWh £772 £108 £880 £11,761 13.4 yrs £5,832
5 kW 5008 kWh 3656 kWh 1352 kWh £964 £135 £1,100 £13,389 12.2 yrs £8,603
6 kW 6009 kWh 4387 kWh 1623 kWh £1,157 £162 £1,320 £15,017 11.4 yrs £11,374
7 kW 7011 kWh 5118 kWh 1893 kWh £1,350 £189 £1,539 £16,644 10.8 yrs £14,144
8 kW 8013 kWh 5849 kWh 2163 kWh £1,543 £216 £1,759 £18,272 10.4 yrs £16,915

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: £1,116, 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 2003 kWh 1502 kWh 501 kWh £396 £50 £446 £10,256 23.0 yrs £-1,328
3 kW 3005 kWh 2254 kWh 751 kWh £594 £75 £670 £11,883 17.7 yrs £1,509
4 kW 4006 kWh 3005 kWh 1002 kWh £793 £100 £893 £13,511 15.1 yrs £4,345
5 kW 5008 kWh 3756 kWh 1252 kWh £991 £125 £1,116 £15,139 13.6 yrs £7,181
6 kW 6009 kWh 4507 kWh 1502 kWh £1,189 £150 £1,339 £16,767 12.5 yrs £10,017
7 kW 7011 kWh 5258 kWh 1753 kWh £1,387 £175 £1,562 £18,394 11.8 yrs £12,854
8 kW 8013 kWh 6009 kWh 2003 kWh £1,585 £200 £1,786 £20,022 11.2 yrs £15,690

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: £1,132, Upfront: £17,589, Break-even: 15.5 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2003 kWh 1542 kWh 461 kWh £407 £46 £453 £12,706 28.0 yrs £-3,646
3 kW 3005 kWh 2314 kWh 691 kWh £610 £69 £679 £14,333 21.1 yrs £-744
4 kW 4006 kWh 3085 kWh 921 kWh £814 £92 £906 £15,961 17.6 yrs £2,157
5 kW 5008 kWh 3856 kWh 1152 kWh £1,017 £115 £1,132 £17,589 15.5 yrs £5,059
6 kW 6009 kWh 4627 kWh 1382 kWh £1,221 £138 £1,359 £19,217 14.1 yrs £7,961
7 kW 7011 kWh 5398 kWh 1613 kWh £1,424 £161 £1,585 £20,844 13.1 yrs £10,863
8 kW 8013 kWh 6170 kWh 1843 kWh £1,628 £184 £1,812 £22,472 12.4 yrs £13,765

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 East Hertfordshire

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 SG12

Figures below are tailored to SG12 — click through for full league tables.

Big-Roof Britain Rank #1816 of 2182
4.4 kWp (UK avg 5.1 kWp)
~9 panels (≈430 W)
Solar Payback Index Rank #713 of 2996
9.8 years (UK avg 10.8 years)
~£829 /yr • £8,139 upfront
Standing-Charge Drag Rank #1162 of 2996
23.8% (UK avg 26.6%) drag on savings
£197 fixed • ~£829 /yr value
Aspect Penalty View ranking →
East −21.6% West −19.7%
Typical output loss versus a south-facing roof (lower is better)

Seasonal solar output in SG12

Monthly generation per kilowatt of solar panels

kWh 39 Jan 53 Feb 85 Mar 111 Apr 119 May 120 Jun 122 Jul 111 Aug 95 Sep 67 Oct 46 Nov 35 Dec
Best month Worst month Winter (Dec–Feb) Other months

Winter output: 50.4% 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 42 kWh per month; the average month produces around 83 kWh. So a typical 4 kW home system would generate roughly 168 kWh in winter, or 334 kWh in an average month.

Your Area at a Glance

Your Electricity Rate
26.38p/kWh
Daily Fixed Charge
53.94p/day
Local Sunshine
1002kWh/kW
A 1 kW system generates ~1002 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: 54% • Flats: 35% • Bungalows: 6% Based on 7,184 properties

Coverage

East Hertfordshire (100%)

Areas Covered

Ware Priory, Great Amwell & Stansteads, Ware Rural, Ware St Mary's, Ware Trinity, The Mundens, Hunsdon, Hertford Bengeo + 2 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

SG13 (East Hertfordshire)
≈3.8 km away
Local sunshine: ~993 kWh/kWp · -1% vs SG12
SG14 (East Hertfordshire)
≈4.5 km away
Local sunshine: ~996 kWh/kWp · -1% vs SG12
EN11 (Broxbourne)
≈5.6 km away
Local sunshine: ~994 kWh/kWp · -1% vs SG12
CM92 (Harlow)
≈7.3 km away
Local sunshine: ~1,006 kWh/kWp · +0% vs SG12
EN10 (Broxbourne)
≈7.6 km away
Local sunshine: ~990 kWh/kWp · -1% vs SG12
SG10 (East Hertfordshire)
≈7.6 km away
Local sunshine: ~1,008 kWh/kWp · +1% vs SG12

Similar sunshine across the UK

NP1 (Caerphilly)
~1,001 kWh/kWp · -0% vs SG12
KT23 (Mole Valley)
~1,002 kWh/kWp · +0% vs SG12
TW13 (Hounslow)
~1,001 kWh/kWp · -0% vs SG12