question

the_salmon avatar image

Multiplus II GX wiring to generator (AC-in)

Hello,

In the MultiPlus II GX manual it is written to follow the instructions below when connecting the AC input:

Left to right: N (neutral), PE (earth/ground), L (phase)

In my setup I have a 3kW inverter generator as AC in, but I cannot understand which is the neutral and which is the phase as the output of my generator is a female plug, on which the plug can be inverted from time to time.

Which is the proper connection in this case?

Thanks a lot

Multiplus-IIGeneratorAC PV Couplingmultiplus-ii gx
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3 Answers
eiremos avatar image

Hello ,

Is it true that in mono , between phase and neutral there is +-230v (in Belgium) ,

between phase and ground the same and between neutral and ground there is 0v .

So with a voltmeter you could test and then and wire your cables .

Isn't it correct ?


Thank-you

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Hello,

following you suggestions I did the measurements. When the AC OUT is coming from MP II (solar or batteries) it is true what you said: 230V from phase and neutral, 0V from neutral and ground.

When the output is coming from my Generator/Inverter (GENMAC GR3000iN) I found:

- 230V from phase and neutral

- about 130V from phase and ground

- about 130V from neutral and ground

I'm a bit confused now, but as far I noticed the MP II is able to charge the batteries; moreover the home loads (bulbs, battery chargers, ...) are working fine as well.

The only doubt still remaining is if the differential switch is working correctly when the generator is supplying power to AC OUT. In case the output is coming from MP II it works fine.

Daniël Boekel (Victron Energy Staff) avatar image

Hi @the_salmon

The inverter will work both ways, but anything on the output will have phase and neutral swapped also, so that can be problematic (depening on local rules and how the system is setup)

Best is to use a polarized plug, like a (commonly called) 'CEE' plug:

https://en.wikipedia.org/wiki/IEC_60309#/media/File:CEE_16A_230V_Wandsteckdose_Pinning.png

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Paul B avatar image

best to resurch the plug type on the generator for the country you are in or the country the generator is from and go by that standard.

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