StrikerX

@Coulomb Actually, I've had this strange behavior with my Axpert VMII as well now.

At first I couldn't understand why it would start for a sec or two and then turn off (this is after I try starting the inverter back up after error 08) and then randomly found out that it only starts (at least for me) when I give it PV (shift PV string from on-grid inverter to vmII) and when it is properly up and running (takes a few seconds). I can shift the PV string back to my on-grid inverter. 
For some odd reason, it doesn't start with grid or battery.

Bumping this old thread...My Axpert VMII's (5Kva) comm card stopped working (USB & RS232). Opened it up yesterday and looks like its gone. Looking for a replacement part but it doesn't seem to be available locally with the Axpert distributors here. Would appreciate any leads @Coulomb @plonkster @Mars
Here's the image of my comm card


 
 

In my case, it takes 1-3 sec for it to ramp up and voila! error 08. Had a shutdown around ~9:30AM on 26th.

This might be useful.

QPIGS raw log(timestamped) leading upto the error and 5min later when i restarted it manually.
[2020-05-26 09:37:51](235.6 50.1 235.6 50.1 1017 1003 020 411 54.10 000 100 0044 00.0 000.0 00.00 00000 00010101 00 00 00000 110 [2020-05-26 09:37:55](236.8 50.1 236.8 50.1 1065 0973 021 411 54.10 000 100 0044 00.0 000.0 00.00 00000 00010101 00 00 00000 110 [2020-05-26 09:37:58](237.5 50.1 237.5 50.1 1092 1014 021 411 54.00 000 100 0044 00.0 000.0 00.00 00000 00010101 00 00 00000 110 [2020-05-26 09:38:01](236.7 50.1 236.7 50.1 1136 0928 022 411 54.00 000 100 0044 00.0 000.0 00.00 00000 00010101 00 00 00000 110 [2020-05-26 09:38:05](237.0 50.1 237.0 50.1 1037 1037 020 411 54.00 000 100 0044 00.0 000.0 00.00 00000 00010101 00 00 00000 110 [2020-05-26 09:38:08](236.2 50.1 236.2 50.1 1157 0934 023 411 54.10 000 100 0044 00.0 000.0 00.00 00000 00010101 00 00 00000 110 [2020-05-26 09:38:11](236.8 50.1 236.8 50.1 1112 0992 022 411 54.10 000 100 0044 00.0 000.0 00.00 00000 00010101 00 00 00000 110 [2020-05-26 09:38:15](237.1 50.1 237.1 50.1 1090 0995 021 411 54.00 000 100 0044 00.0 000.0 00.00 00000 00010101 00 00 00000 110 [2020-05-26 09:38:18](237.7 50.1 237.7 50.1 1069 0963 021 411 54.10 000 100 0044 00.0 000.0 00.00 00000 00010101 00 00 00000 110 [2020-05-26 09:38:21](236.7 50.1 236.7 50.1 1112 0997 022 411 54.00 000 100 0044 00.0 000.0 00.00 00000 00010101 00 00 00000 110 [2020-05-26 09:38:25](236.7 50.1 236.7 50.1 0994 0905 019 411 54.00 000 100 0044 00.0 000.0 00.00 00000 00010101 00 00 00000 110 [2020-05-26 09:38:30](240.5 50.1 000.0 00.0 0000 0000 000 485 54.00 000 100 0044 00.0 000.0 00.00 00000 00000000 00 00 00000 010 [2020-05-26 09:38:34](240.1 50.1 000.0 00.0 0000 0000 000 383 54.00 000 100 0044 00.0 000.0 00.00 00000 00000000 00 00 00000 010 [2020-05-26 09:38:37](240.6 50.1 000.0 00.0 0000 0000 000 273 54.00 000 100 0044 00.0 000.0 00.00 00000 00000000 00 00 00000 010 [2020-05-26 09:38:41](240.7 50.1 000.0 00.0 0000 0000 000 097 54.00 000 100 0044 00.0 000.0 00.00 00000 00000000 00 00 00000 010 [2020-05-26 09:43:26](234.6 50.1 000.0 00.0 0000 0000 000 384 53.40 000 100 0043 00.0 386.0 00.00 00000 00000000 00 00 00010 000 [2020-05-26 09:43:30](235.5 50.1 000.0 00.0 0000 0000 000 426 53.30 000 100 0043 00.1 389.0 00.00 00000 00000000 00 00 00049 000 [2020-05-26 09:43:33](237.8 50.1 237.8 50.1 1403 1319 028 424 53.60 000 100 0043 00.2 381.4 00.00 00000 00010110 00 00 00107 110 [2020-05-26 09:43:36](235.7 50.1 235.7 50.1 1225 1124 024 368 53.30 000 100 0043 00.0 000.0 00.00 00000 00010000 00 00 00000 010 [2020-05-26 09:43:40](236.0 50.1 236.0 50.1 1227 1134 024 368 53.20 000 100 0043 00.0 000.0 00.00 00000 00010000 00 00 00000 010 [2020-05-26 09:43:43](235.1 50.1 235.1 50.1 1223 1135 024 406 53.30 000 091 0043 00.0 000.0 00.00 00000 00010101 00 00 00000 010 [2020-05-26 09:43:47](238.7 50.1 238.7 50.1 0571 0504 011 411 54.40 005 095 0043 00.0 000.0 00.00 00000 00010101 00 00 00000 110 [2020-05-26 09:43:50](236.7 50.1 236.7 50.1 0566 0542 011 408 54.00 001 100 0043 00.0 000.0 00.00 00000 00010101 00 00 00000 110 [2020-05-26 09:43:53](236.0 50.1 236.0 50.1 0566 0538 011 408 54.00 001 100 0043 00.0 000.0 00.00 00000 00010101 00 00 00000 110  
QFAULT
[2020-05-26 12:04:27] Send: QFAULT [2020-05-26 12:04:27] [290ms] Return: (08 04 1045 0942 0046 546.8 54.1 236.9 50.14 235.9ﾠ QFS
[2020-05-26 12:04:35] Send: QFS [2020-05-26 12:04:36] [390ms] Return: (01 08 04 1045 0942 0046 236.9 50.14 235.9 50.13 000.0 546.8 54.1 044 204ﾕￍ
I have the RAW QPIGS (3-5sec latency, around 25-30k rows per day) log if anyone wants to take a closer look.

It seems that the VM IIs have 3 power supplies: battery, main (from the DC bus), and AC. It sounds like you've lost two of yours somehow.
The battery and AC power supplies (both of which don't seem to be working for you) have SMD fuses and NTCs at their very input. It might be that you have blown those fuses somehow.
Look for a PM.

Indeed.
The "204" at the end of the QFS data is the important one to me. That's 0xCC or 0b1100 1100; bits 7,6,3, and 2 are on.
The meaning according to my notes is:
; Status: pic 999 ; Bit 7: AC input relay (N side) on ; Bit 6: Line mode ; Bit 5: battery mode ; Bit 3: inverter relay on ; Bit 2: load relay on In particular, the fact that bits 7 and 3 are on means that the AC-in relays are on, as well as the inverter relay. The load relay is on too. So that means that the inverter-charger is ready for utility charging, even though the battery charge current is zero. To me, that's asking for trouble; it's "standing on a barrel" when it has no need to.
It does confirm that a sudden change in line frequency will affect the bus voltage. Maybe that's all it is; if we can get the inverter relay off, then disturbances in line frequency/phase won't affect the bus voltage. Maybe the boost converter has little to do with it.
I'll see what I can find out.

It's in low power mode. Put a larger load on it (couple hundred watts should do it) and see if it stays on. Then consult the manual on how to disable it.
(I'm not an Axpert guy, in fact I normally don't even answer this side of the fence... but this is such a common mistake I thought I'd help a brother out).