Good day, I installed 2 x Mecer/ AXPERT SOL-I-AX-5M4, installed exactly like my old 5kv Mercer inverters, when powering the batteries up, the inverters came on and when start setings them up it just went of again, start the whole process again, got the settings on the master correct, when starting with the settings on the slave the inverters start make funny noise and the next moment there was a flash both are still working what can be the reason for this it looks like the 2 inverters are fighting with each other, this is a total of grid instelation. I re-installed my 2 old Mercer inverters and it is working immediately correct. Assistance would  be appreciated.

thanks Kobus

4 hours ago, Kobus680718 said:

Good day, I installed 2 x Mecer/ AXPERT SOL-I-AX-5M4, installed exactly like my old 5kv Mercer inverters, when powering the batteries up, the inverters came on and when start setings them up it just went of again, start the whole process again, got the settings on the master correct, when starting with the settings on the slave the inverters start make funny noise and the next moment there was a flash both are still working what can be the reason for this it looks like the 2 inverters are fighting with each other, this is a total of grid instelation. I re-installed my 2 old Mercer inverters and it is working immediately correct. Assistance would  be appreciated.

thanks Kobus

This seems that the 2 inverters are not synchronized. Supply both with AC input and measure the voltage for the Live to the Live of the 2nd inverter on the output. Also from the Neutral to the Neutral on the output  Do this with no loads connected to both. You should get near 0V reading when they are in phase.

I don't have AC power only DC from pannells. I am completely off grid 

 

5 minutes ago, Kobus680718 said:

I don't have AC power only DC from pannells. I am completely off grid 

 

Sorry I missed the important point that you were just working from battery side.

The two inverters should synchronise even without an AC-in source, via the paralleling cables.

You have not mentioned any paralleling boards or cables. Are they installed?

Are you transferring the paralleling boards from the old inverters to the new?

We did install the parallel cables, it is when you try to sync them that it does not want to sync and then it is starting to spark. The master is setup as soon as you want to sync the slave the problem start.

1 hour ago, Kobus680718 said:

it is when you try to sync them that it does not want to sync

When you say you "try to sync them", do you mean you parallel them? Synchronisation doesn't seem to be happening. They can't sync after paralleling; they have to be in step in the first place. In a totally off-grid setting, this has to happen via the paralleling cables, which carry CAN bus and other signals.

To prove whether they are in sync or not, before they are paralleled, measure between the live AC-out terminals with a multimeter on AC volts range. It should read less than about 5 VAC. It is also possible that the inverters are not set to the same output voltage, though they default to 230 V and the firmware is supposed to check that they are set to the same voltage.

It's also possible that the DC-AC converters in the inverters have been damaged by earlier problems, and no longer generate proper sine waves. It would be good to check the outputs with an oscilloscope if possible.

Im not sure if this is applicable to your setup.  

My Fake Axpert panels needed to be told that they are in parallel. 28= PAL

 

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It was when my son want to set the slave in verter setting to 28 to PAL, that the inverter start making a funny noise and the battery cable burned. Could not even get to do the setting, he said that was the only way how he got my old Mercer inverters set to parallel. We have removed the new ones and did exactly the same with the old Mercer inverters with no problems. So I don't understand why the two new Mercer inverters are doing this. What is the difference?

5 hours ago, Kobus680718 said:

It was when my son want to set the slave in verter setting to 28 to PAL, that the inverter start making a funny noise and the battery cable burned. Could not even get to do the setting, he said that was the only way how he got my old Mercer inverters set to parallel. We have removed the new ones and did exactly the same with the old Mercer inverters with no problems. So I don't understand why the two new Mercer inverters are doing this. What is the difference?

Just a question. When trying to set #28 to PAL on the inverters were they in standby mode meaning the power switch is off? 

Yes they were