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charlie-77 asked

Multiplus 2 System Issue

Hi everyone, I’m a complete newbie to victron and have recently taken on a customer that wants us to look after their solar vans, part of a contract with the new solar install. They have an issue with one of them and cant seem to get the system to switch on. They have a multiplus 2 inverter connected to 4 batteries and using the cerbo gx and lynx distributor. All batteries are fully charged and if I try and connect via the app I can only connect to the batteries and mppt, should I be able to connect to the Cerbo unit too?

Just need to know where to start to try and identify what’s not working, I feel like it could be a communication issue. The cerbo appears to have no lights on although power is connected is this correct? Is there a procedure I can follow to see what equipment isn’t working. I’ve added pictures of the kit so hopefully you guys can help me out. Thanks

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3 Answers
Paul B avatar image
Paul B answered ·

on the cerbo the wifi light should be on if its powered. from the picture the cerbo is not powered as the power cable looks like its unplugged.

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Paul B avatar image Paul B commented ·
The bottom 3 plugs seem to be miss alligned, as they usually line up to the markings
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charlie-77 avatar image charlie-77 commented ·
Thanks for the reply, I had taken the power plug out at this point to test the voltage, no lights still once plugged in though.
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Rob Fijn avatar image
Rob Fijn answered ·

In this case there are Victron lithium Batteries. The MP-II should 'see' the VE.BMS via the VE.bus, if not.. the MP-II will not switch ON. Maybe replace this cable.
On the VE.BMS the negative (black ) wire is not needed, as the negative comes via the VE.bus. Take this wire off.
This should work without the Cerbo GX.
Hope this helps a bit. Let us know how this goes.
Rob

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charlie-77 avatar image charlie-77 commented ·
Thanks, yes so 4 lithium batteries installed, when you say replace the cable do you mean the rj45? The MP-II doesn’t connect directly to the ve bus, it’s plugged into the cerbo then a rj45 from the cerbo to the ve bus. Would this suggest a fault with the cerbo? If I was to connect the MP-II directly to the ve bus do you reckon it would start communicating properly?

One thing I forgot to mention as well, the screen that’s connected to the cerbo is also blank so indicating no power.

As it stands there is a rj45 from the MP-II the mppt and the ve bus all connected into the cerbo.

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derrick thomas avatar image
derrick thomas answered ·

Check the serial number of the cerbo. There was a batch of cerbos that had issues on 48 volts. Yours may fall into that range. It may need replaced.

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Fideri avatar image Fideri commented ·
Also check if the inline fuse to the Cerbo power cable is fine.
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charlie-77 avatar image charlie-77 Fideri commented ·
Yeah all good, have checked that, definitely have power at the input plug.
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derrick thomas avatar image derrick thomas commented ·
I was able to see the serial number in your picture so I checked for you. Your serial number is among the effected units. You say that you have verified power at the plug to the cerbo, so you do in fact have a defective unit. One of the victron staff here should be able to give you direction on getting it replaced.
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charlie-77 avatar image charlie-77 derrick thomas commented ·
Ok thank you. That hopefully solves that issue then. Do you know if the fault could affect other equipment connected at the time?
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derrick thomas avatar image derrick thomas charlie-77 commented ·
Check the remote jumper in the bottom of the MP2. You may have a loose or broken jumper wire.
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