LightbulbNeil:

 

Ours has always been quite a big different. They replaced the meters and put in 2 identical meters. After 1 year they were so far apart from each other, that they have recently replaced those pair snd put in a single meter. As I currently don't have a bill , I have not been chasing it. But your post is a very good reminder for me to start looking at the billing data and making a chart or something to align with the billing data times and dates, and then get that data off of the Fronius smart meter. I will look into it on the next account as it will have had a month or two then to get a correct reading with aligned dates and times for our billing period.  Thanks for the post and reminder.  Overall it looks very close to me,  especially the export to he power Co. The import from fronius always seems to be a few kwh less than they say we buy off of them. I'm not sure what the guidelines are for meters to monitor power consumption or export import variations. To me, in our old house that had the spinning disc type of meter,  when it changed to a smart meter,  our consumption was measured as being quite a bit more. So I'm not sure if the electronic meters are actually more accurate or not. But I don't know anyone who had the spinning disc type meter and their power consumption account was the same or lower after the smart meter was installed. 

 

The spinning disc meters that were replaced will have been pretty old and likely worn out.  So I suspect they were not recording as much energy as you were actually using due to the disc not spinning as well as it should (too much drag from the wear and tear and dirt).