In my system I have a Victron Energy Meter ET112 fitted.
I’ve had the energy company out to fit a smart meter but won’t do anything as when everything is shut down the ET112 green light still glows green. Why is it still glowing. What powers it? How can I get it to go out?
They won’t do anything until the light is off showing everything is dead.
Did you disconnect the rs 485 connection? Power should only come from ac so if ac is off so would the et112 be
The ET112 is powered by whatever it measures, it has no external supply. So if its still showing powered on then the measured circuit is still powered.
But where that power comes from i cant tell you. Is it used as a grid meter or as an AC PV meter?
Did they check for absence of voltage?
It’s used as a grid meter.
I would have expected the engineer to check/ trace to see where the power was coming from.
Panels/ inverter/ batteries were all off.
Yes that was discontinued
Now could it be because it is still getting power from the meter as it’s wired in after the meter. She was afraid to pull the main fuse before the meter. All the solar/ batteries goes straight into the main house fuse box.
Im not used to UK installations, but yes, a gridmeter usually is placed inbetween the official meter and the main fuse box. Since the ET112 is measuring directly, means the current has to actually flow through the device, not just an external clamp, means its still powered because the main fuse is still in place.
If you have all breakers off in the rest of the house, then the remaining current flowing over the fuse will be negligable, so it should be safe to pull. But i personally would check that with a clamp meter first.
If the technician is not comfortable then i guess its best if they dont start doing things
Thanks. That’s what I’m thinking now. All electric in the house main fuse box and solar stuff was off but a solid green light on the energy meter but not flashing green/ orange which my understanding is when it’s flashing the power is flowing.
Going to have to contact them and explain it to them but they always think they know better 
I dont know, but a proper electrician would just take his/her multimeter out and just verify things before shouting 
That’s what I thought.
But there’s proper electriions and smart meter fitters
Correct safe isolation isn’t what the system lights on an unknown system tells you it’s what your proving kit tells you ie you test it on two know sources, the one you have to test the kit to see it work on your known power source and then test it on the circuit that is live and then kill the circuit test circuit again and then test the kit on your proving kit to make sure it was still working during that time lol.
But they are correct that light is not going to go out! Why because, there is no isolation switch installed after the smart meter which is energy providers responsibility, clamp meter will confirm if the house is drawing or producing current, but you do need to be 100% on how your system is isolated and get someone to label the tails as this has no doubt confused the hell out of them.
Also they are not allowed and shouldn’t pull that DNO fuse under load, the issue that could have been avoided was if that ET112 was actually installed with the reference neutral that is fused I forget the milliamp fuse size that Victron spec but it didn’t need the big neutral tail connected to it, your best bet is to get a spark to disconnect the ET112 and isolate the cables.
Once done call back the energy provider and get them to come out and also see if they can cram in an isolation switch as it would have negated all of your issues and would help if the ET112 ever needed replacing. Sorry it doesn’t really help but a spark is your only answer here for safety
