Hi, we have two similar systems on the property. One works well, the other does not.
1 x 5K coupled Primo/Multiplus (works)
1 x 3K Coupled Primo/Multiplus (never has worked well)
The 3K Multi makes a very odd crunching (humming) noise when charging (as soon as the primo is turned on). The MP begins to charge then the primo shuts down with various error codes (Error 456) being the most common.
NOTE: it does not make the same sound when charging form the AC input (Geni)
The MPlus has the PV assistant installed as per Victrons recommended settings. The sound the MP inverter is making sounds very unhealthy, but it's made it since day one and I was advised by the sales rep that it was not an issue. The 5K system has never made a sound.
I have just updated the Multi to the latest Firmware version to no avail.
I also changed the Primo to MG60 and updated the MP and Assistant to 60Hz settings again with no difference in functionality
One note is that since updating to MH60 the pitch of the odd charging "crunch
sound has lifted in frequency.
Looking for some advice, please. This is very very odd behaviour indeed.
It feels to me like the MP is sending out bad info to the primo and making it consistently reboot.