PowerLogic PowerTag Energy with delivered/reverse current on breaker-mounted types

[snx]

Hello,

My task is to refurbish and extend an existing building control cabinet. Since space is rather limited, there is no space for full-sized energy-meters, so the powertag's would be my only option.

But i have one question that i could not find completly explained in the datasheets.

Can breaker-mounted powertags (A9MEM1521,1540,1522,1543,1541,1542) used in combination with a photovoltaic system that delivers energy to the grid?  This would mean that after the Breaker there is no consumer but an energy source delivering power to the grid, resulting in opposite current flow than for example a light bulb.

Can the devices be used for this application, or is it better to use a PowerTag Energy Flex 160A which seems to have switchable install direction, but cannot mounted on a breaker.

Thanks for your answers!

[Romain_Polette · Accepted solution]

Hello @snx , 

Please check the Panel Server Modbus file:

https://www.se.com/ww/en/download/document/DOCA0241EN/

According to this file: PowerTag Energy Sensors 63A + Panel Server v001.005.001 seems compatible with Active Energy Delivered and Active Energy Received (total or per phase).

It means that Panel Server + PowerTag sensor 63A can be mounted on PV application.

@Szymon_Hochół can you confirm ? With older Panel Server FW, this feature was not available.

Thanks !

[Szymon_Hochół · Accepted solution]

Hi @snx ,

@Romain_Polette is correct - with current version of Panel Server and current version of PowerTag, you can see Active Energy Delivered and Active Energy Received as separate values:

Please note however that A9MEM15xx PowerTags are only 2-quandrant meters, as opposed to the rest of PowerTag family, which supports all 4 quadrants. Basically, you would get the delivered/received measurements for Active Energy only. This is why I would recommend to go with Flex 160A anyway, where you have bi-directional data for all kinds of energies:

Here is the summary for all types of PowerTags:

I hope this helps.

BR

[snx]

Szymon_Hochół  Romain_Polette

Thank you very much for the reply and clarification.

I have one additional question while looking at the screenshots. In the case of 100% delivery energy, will the current and power registers contain negative, positive or zero values?

For example, will 5A of delivery be displayed as "5A, -5A or 0A"?

[Thierry_Baudard]

Hello,

The current will be always positive (RMS value).

The active power can be negative or positive:

  - if the active power is positive: the energy Delivered is incremented  (from the grid to the load)

  - if the active power is negative: the energy received is incremented (from the PV to the grid)

Obviously, you can use PowerTag Energy sensor 63Amps for your application.

BR