question

michael-parks avatar image
michael-parks asked

victron phoenix 24/375 into ac1 of multiplus II

i would like to use the smaller phoenix for smaller loads then have it switch to the larger multiplus II 24/3000 when needed.so im basically treating the 375 inverter as shore power and that power would go to my rv transfer switch then to the multiplus. so if i plugged everything in what is the default way that it will operate? does it automatically switch to the multiplus when i run out of power? or is there some settings i need to adjust somewhere?

also i dont want to pull power from the battery via phoenix and then charge the battery via multiplus. where do i go to turn this feature off?

i also have a cerbo gx hooked up with ve.bus connection for multiplus and a ve direct cable for the phoenix.

rv-wiring.jpg

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2 Answers
Justin Cook avatar image
Justin Cook answered ·

No.

Besides being an unsupported configuration right from the start, this simply won't work as you think it will, and will cause you all sorts of problems - and potentially damage your components.

Please talk to your distributor, or consult a reputable and experienced systems installer for assistance.

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niklas-schauberg avatar image
niklas-schauberg answered ·

daisychaining a phoenix to a multiplus works in general, but I think the 375 is very small in comparison to your MP. you would have to limit your MP to 1A/230V or 2A/110V max. this seems a bit super low end for me.

why don‘t you use the transfer switch between the MP and the loads?

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michael-parks avatar image michael-parks commented ·

why don‘t you use the transfer switch between the MP and the loads?


my thought was i could charge the batteries if i ever decided to disconnect from the 375 and connect to shore power and change some settings somewhere each time.


how about if i add in a 10 millisecond automatic transfer switch that will switch to the bigger inverter via current transformer triggered by a set amperage. say 340VA or so.
maybe i need to use node red?


reconfigured-rv-wiring.png

my reasoning for the first wiring diagram:
i just thought instead of adding another transfer switch and current transformer that i could just utilize the one built into the multiplus and use victron software to adjust or use node red.



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