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xzv avatar image
xzv asked

Multiplus II: Why is it important that AC-In's neutral and phase are not reversed?

A red sticker in the connection area of the inverter as well as the manual reads:

Do not invert neutral and phase when connecting the AC.

I wonder why this is important when connected in a single phase environment when PE is connected properly. This is alternating current, and the N and PE connections of AC-Out are only bridged after the mains is no longer available at AC-In.

Can someone please explain under which conditions it is important that N and L are not reversed, and what effects this can have?

Multiplus-IIwiring
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kevgermany avatar image kevgermany ♦♦ commented ·
Is this a mobile or static installation?
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xzv avatar image xzv kevgermany ♦♦ commented ·

A static installation, but it's intended to be connected via a "Schuko" (Type F) plug which also serves as the earthing contact.

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Matthias Lange - DE avatar image
Matthias Lange - DE answered ·

It depends on the type of system.

In an ESS with a selected gridcode will not connect to the grid if L and N are reversed.

In a RV without gridcode it will accept the grid in both ways. The problem is that with reversed L and N the circuit breaker will break the N not the L and that can be dangerous. Because of that you should use double pole breakers in a RV.

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xzv avatar image xzv commented ·

I will have the ESS assistant installed and configured and set the grid code to Germany (VDE-AR-N 4105).

My breaker in the installation panel protects the L line, but not N. Or do you mean a circuit breaker inside the Multiplus?

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Matthias Lange - DE avatar image Matthias Lange - DE ♦ xzv commented ·
An ESS needs to be hardwired, it's not allowed to use a plug!

The MultiPlus-II doesn't have an internal circuit breaker. You have to install at last a RCD at the output.

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xzv avatar image xzv Matthias Lange - DE ♦ commented ·

I have an RCD connected. Which standard are you referring to that does not allow a plug-in solution? And I still don't understand which situation creates a problematic situation when you have L and N reversed.

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Matthias Lange - DE avatar image Matthias Lange - DE ♦ xzv commented ·

You already mentioned it yourself -> VDE-AR-N 4105

With the German gridcode the NS-protection is not allowed to connect if L and N reversed.

For the MultiPlus it's not a problem.
It's a safety issue if you break N instead of L.
Normally if you flip the breaker to switch off a circuit you can safely work on the wiring. If L and N reversed and the breaker disconnects the N you still have the live L on the wires -> you can get shocked if you touch the wires.

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