Does anyone know if this type of polyphase meter performs a vector sum of all phases such that the net consumption is billed to me?

Hi @PAA733 , I’ve been involved with someone using one of these recently and unfortunately it depends on how the unit was set up by the manufacturer as to whether it provides a vector sum or not. 
The one I saw installed was done by National Grid but even they weren’t sure of its set up. 
If you note the serial number, perhaps someone back at base can look at the manufacturing data

Our community members have given some helpful advice here @PAA733, I’ll see if one of our metering experts has anything else to add here & report back. 

Three-phase SMETS2 meters (like this one) have been around for a couple of years, but getting your hands on one is not easy - there aren’t many 3φ meter engineers around. It will depend on where you live, and having a meter that’s currently working with quite a few years of certification left will probably count against you.

Thank you all for your responses - very interesting reading. @Emmanuelle_OVO have you had any luck speaking with your metering experts yet? (or can you point me in the direction of OVO support please).

It’s a (rare!) sunny day here in East Lothian and I’d love to find a use for the energy I am producing!

Hi @PAA733,

Apologies for the delayed response. 

I’ve chased this up and our metering expert has responded said, “the meter will not factor how much it imports against how much is generated or exported. They’re always separated out and treated independently. It will record all imported, and then all exported and provide those values, no matter how many phases are involved.”

Hope this helps.