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Hans Schive avatar image

Multiplus 2 wont turn on

We have a multiplus 2 48/3000 connected to a BMZ ESS 7.0 48V Li-ion battery. The multiplus has 230V AC power supply and the battery supplies 54V DC, the MK-3 interface is connected to computer and the firmware has been upgraded, however when switching on the multiplus nothing happens. No diodes light up and the computer cant find the inverter.

Additionally we've connected a CCGX with RJ-45 to the multiplus and a VE.Bus to CAN Type B Cable is used to connect the ESS to the CCGX.

Since we can't get any communication up and running we're not able to proceed with the configuration. Perhaps something was set to not allow the multiplus to switch on due to connecting the CCGX to the poles of the BMZ battery for Power Supply. If so how could we reset the Multiplus II inverter to begin over following all the steps in the manual?

Thanks in advance. All insights are greatly appreciated :)

MultiPlus Quattro Inverter ChargerESSbattery charging
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i have a new multiplus II 48 / 3000 and similar issue, it wont turn on or do anything, i cannot communicate with it nor update the firmware.

2 Answers
Paul B avatar image

Lets start at the basics

Dont connect anything except the battery to the MPII

and you have turned the On/Off switch to Position 1 ON after the battery isa connected

the MPII should then start nothing else connected (if it does not then plug the MK3 in and connect it to the computer and configure the com port in the ve config software)

Then

plugged the MK3 directly into the MPII and connected it to the laptop and then to VE config and check you can see everything

after the above


do the firmware update to 459

then connect the CCGX and make sure it all works


if the above does not work then please take some photos and post them here of the system setup,

Or it maybe better to contact the company you purchased it from for some local help


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Hi Paul, Thanks so much for you response. It seems, in fact, that there is an issue with this MPII, we were able to connect another MPII and get it turned on right away. The faulty inverter will be sent back to Victron. Hopefully they can figure out what's wrong. Thanks again, and kind regards.

Paul B avatar image

I presume you have unpluged the CCGX and everything else from the MPII

if not try that,

it would be best to make sure its on the latest FW 459


also reinstall the Fw again if it does not fire up

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Hi Paul, thanks for the quick reply. We've unplugged the CCGX, and removed the fuses in the battery. The MPII is not showing up through the VE.Config, the config tool is finding the MK-3 device, however when attempting to auto detect for the port selection there's nothing, that way we're not able to update any firmware. MPII seems completely dead. Do you know of any way to reset or achieve communication with the MPII?