question

ivar2026 avatar image
ivar2026 asked

What happens to the Neutral?

I'm looking at using the Quattro 15k 230v with the change to make it 240v-60.

On this diagram: https://www.victronenergy.com/upload/documents/AT-1-split-phase-240V-to-120-240V-with-Quattro-240V.pdf

It states: The neutral white is not connected in the inverter in the special box on the top right of the diagram.

My questions are:

1 - What happens to the neutral wire... cap it? attach it elsewhere?

2 - What are the implications of not having that connected if the Quattro is then connected to the auto transformer to create 120/240 split phase?


The incoming 240v I want to send in would be from a 50amp shore power connection.

The system would not be grid connected.


MultiPlus Quattro Inverter Charger
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3 Answers
mvas avatar image
mvas answered ·

A1 - There is no neutral wire from the shore power. If your shore cable has a neutral wire then "cap" it. No, do not connect it elsewhere. Follow the instructions - "not connected".

A2 - There is no "implication". The AT derives a new neutral wire and connects it to PE.

The diagram in your URL, appears correct.

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ivar2026 avatar image ivar2026 commented ·
Thank you!!!!!!
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klim8skeptic avatar image
klim8skeptic answered ·

@ivar2026 that drawing is not suitable for 120-120 split phase input.

It requires 240v single phase where the neutral is referenced to earth.

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mvas avatar image mvas commented ·
Explain why you think, the schematic is not appropriate for 120v-120v Split Phase output, from 240 volt input with no neutral connection to the shore power.
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klim8skeptic avatar image klim8skeptic ♦ mvas commented ·
@mvas Your correct. Gotta read all the notes.
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Kevin Windrem avatar image
Kevin Windrem answered ·

If the AC input is 240 volts to neutral (not 120-0-120 split phase), then the load neutral ends up at 120 volts relative to ground. This isn't good since the neutral is expected to be about 0 volts. A fault that grounds the load neutral will cause fault current to flow and trip breakers. If the fault occurs in branch circuit wiring, there is no breaker in the neutral and the fault current may not be sufficient to trip the main breaker before wiring burns.

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