Hi 

I have a  efergy unit that takes reading from the box on the boundary of property.
 

I also have a Carlo gavazzi ET12 in the db box. This is connected to CCGX. 

I compare the efergy reading to the ccgx (grid) and see different readings. Why is this? 

Which one is more accurate ?

 

hope my question makes sense. 
 

thanks , 

12 hours ago, midnightcaller said:

I compare the efergy reading to the ccgx (grid) and see different readings. Why is this? 

Which one is more accurate ?

Hi the CCGX is the one to look at, Efergy only have "Current Values" to work with and you have to manually enter a "Voltage Value" to use. The Grid voltage changes constantly making the readings inaccurate. 

There is more complex explanations about Apparent power and Active power and the likes, but the simple explanation above should do..  

2 hours ago, midnightcaller said:

Hi 

I have a  efergy unit that takes reading from the box on the boundary of property.

Is there also a meter provided by the utility in this box as well?

5 minutes ago, Richard Mackay said:

Is there also a meter provided by the utility in this box as well?

There is a meter from eskom in this box.

there is also a customer interface unit in the house.
Landis +gyr model P160 CIU PLC G3. 

I haven’t figured out how to read this device. 

is it the E460 single phase prepaid meter?

9 hours ago, Richard Mackay said:

is it the E460 single phase prepaid meter?

I have single phase. 
But I’m not in prepaid. 

This is the meter that the utility will use to bill you for electricity usage so it's a good idea to start with this meter.

I presume electricity usage is what you are trying to determine. The kWh value on the E460 (default screen) is a running total. In order to compare the different readings on your meters I suggest you keep track of the different kWh readings beginning with an initial reading. Then you can work out the electricity used by subtracting the current value from that meter's initial value. 

If you want to check on the account the utility sends you (never a bad thing to do!) you need to know exactly when they read your meter. This is probably automated for midnight on the first day of the month. But they should tell you if you can't readily see this on your account.