#1 Nov. 20, 2014 12:27:00

Rick M
Registered: 2012-03-22
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Smart Meter Technical Standards

Found this today:


Looking at the latest (31/3/14) document, the Standard specifies the minimum physical, functional, interface and data requirements of an Electricity Smart Metering System and In House Display which suppliers must now comply with under new licence conditions.

The minimum data an In House Display (IHD) must show does not include exports from any microgeneration equipment (Section 5.4.1) but the Electricity Smart Meter System (ESMS) must be capable of passing requests from a central source (Head End System) to a microgeneration meter for export data and transmitting such data back from the meter to the HES (section 5.4.2). The Head End System is defined in the Glossary as a system which provides a centralised means by which an Authorised party can access Gas and Electricity Smart Meter Systems … across a Wide Area Network.

From this I conclude that a basic smart meter system In House Display need not show solar PV owners any export data although it has to be capable of passing export data to a central point when requested. It also looks to me as if a Microgeneration Meter has to be capable of communicating with the ESMS (aswell as measuring export data itself).

So even waiting for the rollout of the national smart meter system may not avoid having to pay for an export meter (that can communicate with the ESMS) and (optionally) an In House Display that can show export data.

PS Found this document via smartenergygb.org which I first heard advertised yesterday.  









Edited Rick M (Nov. 20, 2014 12:27:00)


#2 Nov. 21, 2014 09:53:00

From: The Banks Of The River Mole
Registered: 2014-03-22
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Smart Meter Technical Standards

  So another Quango.  “Smart Energy GB is an independent body, created by government, to handle the crucial role of engaging Great Britain in the national rollout of smart meters. Our role is to explain smart meters and ensure a level of understanding that means their benefits are enjoyed by all.                                       ”In This Day And Age, It's Hard To Tell If Internet Quotes Are genuine". Abraham Lincoln.

The gene pool has no lifeguard!

Edited Capetown (Nov. 21, 2014 09:53:00)


#3 Nov. 23, 2014 17:50:00

From: Southend
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Smart Meter Technical Standards

Hi Rick.

Although not as accurate as an export meter, I'd prefer one of the circuit-clamp monitors with an internet bridge to an online portal personally. It's the automated monitoring and avoidance of manual export readings that appeals to me, and it does seem that the smart metering development community are as yet only at the stage of catch-up with these products.

For the Smart Meter alternatives such as they are currently, let's consider the various Smart Meter components separately.

1. The Smart Meter itself.
As you say, Section 5.4.2 only relates to the sending/receiving of data with a Microgeneration Meter (if there is one). Instead, isn't it the core functionality of “Section 5.3.8 ‘Recording’” what we should be looking at, and the specifically mentioned " Total Reactive Energy Exported ?

This does confirm that Smart Meters do always include an Export recording capability.

As I found, reminding the meter installer configuring the meter display to include the Export is another matter, though! (No one considers PV owners, do they? I was lucky in managing to have them persuaded to remotely reconfigure the meter post-installation.)

On it's own, the householder therefore needs to manually record Export readings from the meter display (which is what I currently do periodically) in the same way as for import.

2. The In-Home Display (if any)
As you say, the minimum specification for an In-Home Display does not mention Export.
That said, I'd have thought that the half-million of us with PV represents a genuine commercial opportunity for some In-Home Display supplier or other to target us with a product that does indeed show us PVers realtime export as well as import.

3. On-Line Portal (if any)
British Gas seem to already provide an online customer portal for accessing smart meter data. I don't know if this can be configured to include the export data, but I'd imagine so and personally I'm more attracted to this aspect than the In-Home Displays for realtime monitoring.

It would be good to hear on this forum what type of products emerge, for 2 and 3 above especially.

Economy 10 tariff provides 6.9p/kWh off-peak import between 12am-5am, 1pm-4pm and 8pm-10pm; http://www.pvoutput.org/aggregate.jsp?id=21047&sid=18934&v=2&t=m on approx. 63% off-peak usage, 22% solar usage, and 15% peak-rate usage.
1,900kWh annually is exported, mostly in summer, on approx. 3,200kWh generation. Approx. 4,500kWh/year is imported, mostly for (a) winter and springtime off-peak Storage Heaters, and (b) off-peak hot water Immersion heating (which is “dumb”, i.e. not linked to the solar PV).
PV array is split East-West. Income is from Phase II 21p/kWh Feed-in-Tariff plus smart metered 3.2p/kWh Export Tariff.

Edited rogerhoward (Nov. 23, 2014 17:50:00)


#4 Nov. 27, 2014 17:10:00

Rick M
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Smart Meter Technical Standards

Thanks Roger.

I'll have to take a close look at the AC side of my inverter to see if I can figure out which section of cable I should clamp (or ask my installer I guess).

Re 2: I understand that smart metering is being paid for by us all through our gas and electricity bills and so there may be some pressure to keep costs low and provide the basic functionality free of charge to householders (as per the Technical Standard). If an enhanced In House Display for home-generators was produced, I wouldn't be surprised to be asked to pay for the extra functionality.


Edited Rick M (Nov. 27, 2014 17:10:00)


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