Sunny Home Manager 2.0

[Raffy2019]

Hi Everyone!

I would like to ask if how to connect my SMA Homemanager 2.0 in an IT Grid with CT?

 

[waross]

RTFI?
Link
Starting page 27.
SAFETY ALERT! CTs MUST NEVER BE OPEN CIRCUITED WHEN ENERGIZED. DO NOT ATTEMPT TO CONNECT OR DISCONNECT THE SECONDARY WIRING WHEN CURRENT IS FLOWING IN THE PRIMARY CIRCUIT|
CTs MUST HAVE THE SECONDARY TERMINALS SHORT CIRCUITED TOGETHER WHEN THERE IS NO LOAD CONNECTED TO THEM.

Bill
--------------------
"Why not the best?"
Jimmy Carter

 

[Raffy2019]

Hi Waross

Yes. I have a manual for the installation using CT but its for TN Grids. I'm looking for IT Grid system. Im wondering where to connect my neutral terminal.

 

[FreddyNurk]

In that case I'd ask SMA. Presumably they have a perspective on use of their equipment in an IT system as well.

EDMS Australia

 

[waross]

If you only need a neutral to power the SMA, then use three small transformers connected in Wye/Delta.
The wye voltage must be greater than 58% of the line to line voltage and the secondary voltage is unimportant.
Connect the secondary in delta and forget it.
Connect the primary in wye and connect it to the three incoming phases. The wye point will develop a stable neutral voltage.
Do not ground the wye point. Connect it only to the SMA.
If the wye point is grounded a ground anywhere on the local system will burn out the transformers.
Transformer size?
Full load current of the primary windings to be over half the control current demand of the SMA.


Bill
--------------------
"Why not the best?"
Jimmy Carter