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alaskannoob avatar image
alaskannoob asked

How many Victron Autotransformers can be connected to a single Multiplus II?

If I have a single Multiplus II 230V supplying single phase power to several different locations on my property, how many Autotransformers can I have at each location to split the power into individual breakers given that a relay is required from inverter to Autotransformer? Can other relays from the Cerbo GX or MPPT RS in the system provide the relay to the Ground Relay of additional Victron AutoTransformers?

Autotransformer
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Mike Dorsett avatar image
Mike Dorsett answered ·

you could use one slave relay driven by the Multi, to control the other Autotransformer relays.

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alaskannoob avatar image alaskannoob commented ·
That would be great. From what I understand, somehow, the inverter through the relay to the AutoTransformer shuts off power to that Autotransformer when it overheats or has a fault or something. So using the slave relay, when the Multi senses a fault with one Autotransformer, it would just stop supplying power to both Autotransformers I suppose. It also does something with grounding/bonding to solve the issue with 230V single phase power, but I don't think that's an issue for an off grid installation so perhaps it doesn't matter for our case.


Thanks for the info.

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klim8skeptic avatar image klim8skeptic ♦ commented ·
@Mike Dorsett It's probably best you know that the AT will be 700' from the multi.
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