Multipus 48/5000 in parallel not working

DIY
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1

Good evening everyone

I have 2 x 48/5000 multiplus inverters wired in parallel. Total 10kva

Today i turned off my entire system off to do some maintenance on the house wiring

when
I turned the inverters back on, the master is flashing between inverter on and absorption. (seems to be an error code 3)

while the slave is flashing all led’s as once.

I haven’t changed anything on the system, simply shut everything down and turned it all back on again???

now i have no output from the inverters.

just to note they are not connected to the mains power

any ideas what could be wrong??

thanks in advance

2

Don’t know if this will help from the troubleshooting guide

Error 3 - Not all, or more than, the expected devices were found in the system

Possible causes and solutions:

  1. This error often follows VE.Bus Error 1. Solution: solve the cause for VE.Bus Error 1. Note that when using an older CCGX (version before v1.40), it can be that the first error is not reported on the Alarm log on VRM. So even when it only lists VE.Bus Error 3, it can very well be that that error was preceeded by VE.Bus Error 1.

  2. The system is not properly configured: all VE.Bus devices connected to the VE.Bus network must be configured as one parallel, split- and/or three-phase system. Do not connect two separate VE.Bus systems together.

  3. Communication cable error: Check the communication cables. Make sure to use commercial patch leads and not hand-crimped cables - VE.Bus cabling is very sensitive to physical wiring faults.

  4. DC fuse blown of one or more units in the system: When mains is available all units seems to work correctly. But as soon as mains fails, or as soon as the system decides to switch to Island mode for any other reason, the units with the blown DC fuse will be without power and switched off - and thus be “missing” from the communication network.

  5. When switching off so called “complex systems” where the switch-as-group VE.Bus configuration is disabled and not all phases have AC-in. In some Multi models like the MultiPlus-II the VE.Bus communication remains active when switched off through Venus OS as long as AC in is available. In this case other Multis in the system with no AC input do not communicate. Causing the Multi with AC input to raise error 3. Complex systems are not supported and tested during Venus OS development.

Recovery: auto-restart once the error is gone.

3

Thanks Dave
I did look at that and have changed my data cables
the system was working well prior so i don’t believe it is a configuration issue

Have checked the fuses. Not sure if there are any internal fuses i couldn’t see any info on that

strange one

4

Yes odd.
Can test each one separately (not in parallel ) to see if one fails or not?

5

will have to reset each one to a single unit to do that as it wont come up in VE config with the fault linked together

6

Ok understood.
I guess you have power cycled both units and both on the latest firmware? And tuning them on , 1 first then 2 then 2 first and then 1 don’t know if that would make any difference :thinking:

7

Yes mate have powered them up every possible way LOL

Both were working 2 hours prior in exactly the same setup nothing has changed with the system

All I did was turn off battery power solar power and isolated it from the house.

Then restarted it 2 hours later

I’m stumped as to why

8

Ok well not much else i can think of

You might have to do a Pre RMA Test

Sorry i can’t help anymore.
Good luck :+1:

9

Thanks Dave I’ll go through the Pre rma test procedure tomorrow and see where we end up

Thanks for your help
cheers Steve

1 Like
10

You’re welcome Steve and good luck mate :+1: