I have 2 Mecer 5m4 connected in parallel. I get a F08 error on inverter #2. Inverter #2 program 28 is set to PAR. But inverter #1 can't change to PAR form SIG in program. Could that be the problem for F08 on inverter #2.

3 minutes ago, Johan Kotze said:

I have 2 Mecer 5m4 connected in parallel. I get a F08 error on inverter #2. Inverter #2 program 28 is set to PAR. But inverter #1 can't change to PAR form SIG in program. Could that be the problem for F08 on inverter #2.

If memory serves, one cannot change setting 28 when inverter is ON. You need to switch it OFF, so its in standby, then it allows change. 

@BritishRacingGreen thank you will try tomorrow. F08 is error bus overload

I would NEVER EVER run inverters in parallel until ALL the setting 28 values are correct. Otherwise, you are just begging for trouble, connecting two AC outputs together that aren't completely ready for parallel operation. If one output is a few volts different from the other one, huge currents can flow. One place for the current to end up is in the bus capacitors, charging them. But they can't take much current before they over-voltage, hence the fault code F08 ("Bus voltage is too high").

38 minutes ago, Coulomb said:

I would NEVER EVER run inverters in parallel until ALL the setting 28 values are correct. Otherwise, you are just begging for trouble, connecting two AC outputs together that aren't completely ready for parallel operation. If one output is a few volts different from the other one, huge currents can flow. One place for the current to end up is in the bus capacitors, charging them. But they can't take much current before they over-voltage, hence the fault code F08 ("Bus voltage is too high").

This is such a important note you making here, I have noticed so many people doing this integration on informal and casual basis.  I am so scared of firmware upgrades and parralel configuration, that It has become my worst nightmare 😣

I have a question, should there not be not an assurance sequence over the machines  protocol  that  the alternate connected machine/s must all be on the same (parralel) or compatible (3ph)  configuration, and that all machines has synchronised to timing criteria, before any attempt is made to assert its ac output? 

EDIT : of course having ALL machines in SINGLE mode  will be a disaster. 

Edited March 5, 20232 yr by BritishRacingGreen

@Coulomb I did switch inverter #2 off immediately when I saw F08. So I only run inverter #1 now.

@Coulomb I did switch inverter #2 off immediately when I saw F08. So I only run inverter #1 now. Waiting for the electrician to disconnect the battery cables so that I can change 28 to PAR on inverter #1. Then both will be PAR. Then connent the cables again.

@BritishRacingGreen It was a disaster first time around. Luckily the supplier replaced the unit.

7 minutes ago, Johan Kotze said:

@Coulomb I did switch inverter #2 off immediately when I saw F08. So I only run inverter #1 now. Waiting for the electrician to disconnect the battery cables so that I can change 28 to PAR on inverter #1. Then both will be PAR. Then connent the cables again.

@BritishRacingGreen It was a disaster first time around. Luckily the supplier replaced the unit.

Great, keep us posted, I want gain experience myself on parralelling.