Currently I have 2x2000w multis running parallel on a boat. I want to swap 1 multi for a Quattro. What would be the best way to do this and still be able to use both chargers and have 7k inverter?
you cant! parallel systems needs to be the same model!
I don’t want to parallel them .
Ok then you need to explain 
That is a paralell system unless you want to feed the multiplus into the quattro
Thats what @Maxtosea wrote, parallel, but then he/she wrote its not, so thats why i asked to explain …
I was saying currently my 2 multis are in parallel. But I want to remove 1 and install a Quattro.
Was thinking of running it in 2 separate systems.
Quattro will run washer/dryer, water heater, microwave, kettle, dive compressor and Master side suite
Multi will run Port side, salon and cockpit
Do you see a problem doing it this way?
How would I do this?
It can be done but will be difficult to run a multi and quattro on 1 battery bank, only on of them can control charging, if you have a gx only one can be connected
@Maxtosea
See Section 4.1 of the Cerbo manual, plus the DVCC section.
So basically the multi would be inverter only and the quattro would be both?
They could both charge, but the Multi would be standalone and not covered by DVCC control. If you have a single lithium bank then adding in BMS protection for the standalone inverter becomes more complicated.
I do have 2 BMS’s but using only 1 atm. How would I add a standalone?
Suggest you involve a marine electrician here.
How it is done depends on what type of batteries / bms you have, how this interfaces with the Cerbo/ inverters and if you can wire in 2 completely separate ac systems for the different areas of the boat.
The ac outputs from independent inverters should be kept physically separate, as the output would not be in phase voltage difference between the 2 systems could be much higher (415V for 2 x 240V systems).
4x 330ah victron lifepo
V. E bus bms version 1
I do have a V.E bus bms version 2 but haven’t connected it
I’m thinking to just keep it simple and use the multi as an inverter and the quattro as both.
OK, single battery bank with the quattro as the managed inverter with the VE Bus connections between BMS V2, Cerbo and Quattro all per manuals. The BMS V2 shuts the inverter down via DVCC.
The Multiplus is used as an inverter only connected to the battery bank, connect this to the Cerbo with a mk3 to USB cable so that it is monitored. If there is a problem with the batteries this will not be shut down by DVCC on the Cerbo. You will need to configure a means of shutting the Multiplus down. If you reprogram the Multiplus you can disable the charger function on the charger page as below then you only need the BMS to stop the Multiplus from discharging the batteries.
The remote switch terminal can be used to turn the Multiplus on and off if the rocker switch is left in the on position. Therefore, if you connect the ATD port on the BMS to the Multiplus remote terminal then you should get it to shut down if needed. You will need to work out the fine details from the manuals. There may be other ways of acheiving this using the digital inputs and assistants.
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Thank you for this. Question. Will I be able to see both inverters on the cerbo monitor?
The Quattro only will be shown on the graphical overview diagram, to see the Multiplus you would have to go into the devices menu where its information will be shown, so slightly hidden.
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So on a different option. If I wanted to connect the multi to one of the inputs on the Quattro how would I do that and what would be the benefits from your previous comment?
People have done this, but it is completely unsupported by Victron. The benefits people are looking for is a single ac network on the output of the Quattro rather than 2 independent ac networks avoiding the issue of the 2 networks being out of phase because. You still have the issue that the Multiplus will not be controlled by the BMS via DVCC on the Cerbo, it remains visible only in the devices list and needs to shut down by the BMS ATD port assuming inverting only. The downside is if the inverters are damaged you are out of warranty support, if the control systems of the 2 inverters do not get on you will have poor control of the voltages which could cause over/under voltage shut downs, equipment cycling, high DC ripple currents etc. I have no idea if the benefits outweigh the disadvantages.
Have a look at the following Google search on the old community archive and one topic listed and search for serial on this forum.
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