How to enable export meter display on a Smart Meter remote display (L&G E470, T5242

Are you trying to interrogate it via zigbee ?
If so I believe it is compliant with zse-zigbee-smart-energy-profile-specification 1.2  As I understand it though the network of meter and the  home display is manged by your energy provider - and is enctrypetd, so unless you can get the meter or the display to disgorge some keys ? 
But maybe, depending who your supplier is, it may be possible to get it from the web after  it has been read e.g. https://www.n3rgy.com/consumer/ 

Mike.

At the moment I'm just trying to make it easier to get the same export reading that our SEG is reading!  We aren't even sure if the solar export meter reads the same as the main export meter :-(   

It didn't help that we 'lost' 3 months of export money because of delays and confusion about all the registrations (MCS, MPAN, etc) and getting the SEG to read it (despite being our main supplier).

So at the moment the idea is to expect that the display that came with the main smart meter should be able to display its own export meter reading. Surely not too much to ask (rhet) ? 

I will look up the references. The meter was installed in '22 for the previous owner. At the moment I'm working off YouTube video for the button sequence (A, B, ...) to read the meter!

Hi Philip

A couple of comments and queries for you, with potential issues highlighted:

Do you have one or two inverters?

Your PV system (under MCS) will have a meter to measure total generation - not export. The total generated can be compared with the annual generation prediction on your MCS certificate. If you have a single (hybrid) inverter, this generation meter needs to be bidirectional and be able to give you the net energy flow (or access to flows in both directions so you can work out the difference). 

For a battery system to work properly it needs to know about the power imported / exported to the grid. Typically battery systems will have an app or website that allow you to see what is happening - with options to extract historic data and charts. Live measurements tend to be in chunks of 5 mins or so - so not totally "live" but pretty good. If the battery inverter has a display, this may give you live data on import / export, with a time lag of less than a second. Finally, another good way to see live power data is to put a current clamp meter around a meter tail - you will need to convince yourself of the correct direction of the current. A key thing is to verify that the battery is properly set up (assuming maximising self-consumption is the main objective)  ie. does it typically allow the grid current to be near zero, and does it quickly revert to zero when a load such as a kettle is added or removed? An easy installation mistake is to get the CT clamp the wrong way around in which case the system will not at all do what it is supposed to.

Total energy exported as reported by the battery system should be similar to what your energy supplier reports (their smart meter is properly calibrated and based on an in-line meter, whereas the battery system is likely to work with a CT clamp and is not formally calibrated). 

Finally there is an app by "loop" that allows you to read out your smart meter data (in half hour chunks). Not sure if that will report export data as well though. 

Jeroen

Thanks Jeroen for the feedback.

The system is an EcoFlow PowerOcean hybrid inverter with two solar strings and a 5kWh battery. The secondary 'generation' meter is an Emlite ECA2.Nv It does read/display its own Import, Export and Net values.

I'm happy that the CT (current Transformer) is correctly between main Smart meter and the Consumer unit, facing the right direction, in that the generation meter numbers match what is expected (minimal grid consumption, plenty export, reasonable battery time shifting;-). There's also numbers on the EcoFlow app (..from it's own internal 'meter'!)

Had a very quick look at the Loop (https://loop.homes/loop-smart-meter-app/) and, I think, it needs a phone with a ZigBee connection [though cheap USB ones do look available on the Maker market (https://shop.pimoroni.com/products/sonoff-zigbee-usb-smart-adapter?variant=54931367297403)]

I'm expecting a percent or two (possible) difference between the two meters, plus possible different start points, just because they are independent measurements, notionally of the same thing (active power). 

On the smart comms side it does feel like it's all a bit of a guddle, with probably too many options for what's inside the Smart meter, what is being interrogated by the remote display, etc.

It may not help, but my smart meter is set to cycle through the various modes automatically.  I was asked by the installer if I wanted to do this and he set it up.   I would expect that all meters can be set to do this, but cannot tell you how it was done.

David

Hi David,

Yes my generation meter, the ECA2.Nv (fitted by the installer), does cycle through the export, import and net readings it calculates.

Unfortunately that's not the main Smart meter that the electric supplier reads, hence the desire to find an easy way of getting the readings the supplier/SEG smart reading will be.

I have managed to find an older vid I made of the smart readings on 16/6/25 [05257 Import; 00908 Export] and compared it to today 28/6/25 [05257 Import; 00908 Export], so over the 12 days, it's +4 Import and 63 (kWh) Export.

My generation meter totals today are export 1639.8, import 15.2 (since 10/1/25), but that import figure feels very wrong (I like the export number;-), hence the desire to clarify what's going on (I hadn't recorded a video for the gen meter on 16/6).

The EcoFlow is is poor at giving the totals figures at points in time, so 'tricky' for doing a 3-way cross check. The CT clamp is only stated as 0.5%, and I expect the other meter will also be 0.5%, so 0.72% overall  

You will probably find that the export reading on the smart meter is significantlylower than on the generation meter.  This is expected.

The generation meter is telling you how much the solar has generated, including electricity you have used yourself.  The SEG only pays for electricity you actually exported to the grid.

The 15.2 reading is probably what the inverter itself has used at times when the solar panels aren't generating.

You will probably find that the export reading on the smart meter is significantlylower than on the generation meter.  This is expected.

The generation meter is telling you how much the solar has generated, including electricity you have used yourself.  The SEG only pays for electricity you actually exported to the grid.

The 15.2 reading is probably what the inverter itself has used at times when the solar panels aren't generating.

Thanks, I'd partly got confused by the CT for the inverter, thinking it was for the gen meter.

I had appreciated that the gen meter usage (15.2 kWh) was probably just that circuit.

Still got some checking to do!

Getting one's head around all these different 'solar' readings is worse than three phase with a loose neutral!

None of the readings (especially when compared) appear to agree with each other as they keep measuring subtly different things! The EcoFlow app treats the battery as a 'load' distinct from the solar load and sending power to the 'grid', and it chunks the readings rather than giving 'cumulative' numbers.  Now to see how/if the SEG will show the readings it uses..