1. Originally Posted by Dave A
Your 16 amp reading seems to be a sum of the current on all three phases.
You multiply by 1.73 when you are using the current for one of the 3 phases ... (and this assumes a balanced load).

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which is what it is 16amp on one phase and it is balanced as it is 4 escalators with 3 phase motors , each escalator drawing 8 amps per phase , confirmed with tong test

2. From the 8A per phase reading that you get for each motor, that calculates to 3.68Kw/ph multiply by 3 = 11Kw.

Can you confirm if they are 11Kw motors ?

Ooops !!! a 5.5Kw motor draws approx 7,5A.

Can you confirm what size the motors are ?
That will confirm if the AC readings obtained with the tong tester are correct.

3. Originally Posted by Derlyn
From the 8A per phase reading that you get for each motor, that calculates to 3.68Kw/ph multiply by 3 = 11Kw.

Can you confirm if they are 11Kw motors ?

Ooops !!! a 5.5Kw motor draws approx 7,5A.

Can you confirm what size the motors are ?
That will confirm if the AC readings obtained with the tong tester are correct.
Cant get to the motors - Have used 3 different tong testers in different makes as well and the logger - All 4 give the same readings

4. These are 2 pics of the inverter screen running on grid in parallel
On the load side under one with a tong tester I get 25amps and on the other 14 amps

Attachment 8933
Attachment 8934

5. There are a million things going through my mind. So many questions.

Are you any closer to solving the mystery ?

Sounds as if there's power coming from somewhere else besides the batteries.

If there were panels involved then one could understand it, but without panels, it is a mystery.

Is the output of a 3ph inverter in a star or delta configuration?

6. No closer , have spoken to numerous people that are involved with designing including supply and always the same answer - Can't be possible

Config would be star and there is nowhere else that power can be coming from

7. Still working on this "mystery".

I dont know 3 phase inverters.
Dave mentioned that a 12Kw 3phase inverter consists of 3 single phase 4Kw inverters.

Now the question is, what is the phase voltage of each 4 Kw inverter ? 220v or 380v ?

8. I somehow don't think there's a problem with your physical current readings.

The "mystery" is somewhere in the power calculation in my opinion. Now to find it.

9. Originally Posted by Derlyn
Still working on this "mystery".

I dont know 3 phase inverters.
Dave mentioned that a 12Kw 3phase inverter consists of 3 single phase 4Kw inverters.

Now the question is, what is the phase voltage of each 4 Kw inverter ? 220v or 380v ?
It is 3 phase inverter but you can draw single phase supplies of each phase and if balanced then 4kw on each phase , most allow up to 70% imbalance on the phases

10. Originally Posted by GCE
These are 2 pics of the inverter screen running on grid in parallel
On the load side under one with a tong tester I get 25amps and on the other 14 amps

Attachment 8933
Attachment 8934
I'm not sure why, but those images are not available.

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