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Difference between the AC-In PE ground and Primary PE ground on Multiplus II
I’m busy looking a the Victron Multiplus II manual, specifically the connection diagram. Here I see that there is a PE grounding connection a the AC-Input (marked C on the diagram) as well as “Primary ground connection M6 (PE)” (marked F on the diagram).
What is the difference between how these two PE ports ground the system and when should you use one or the other (or both)?
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The AC-In PE ground (marked C) is where the protective earth for the AC input power is connected. Its primary role is to ground the electrical current coming in from your power source, such as the grid or a generator. This is a standard safety feature, ensuring that in the event of a fault, any excess current is safely diverted to the earth, reducing the risk of shock or fire.
The Primary ground connection M6 (PE) (marked F), on the other hand, is a dedicated chassis ground for the inverter. This connection is designed to ground the inverter’s own frame and internal components. It’s a direct safety line to the earth, intended to handle any internal faults that might occur within the inverter itself. By grounding the chassis, it ensures that the inverter’s metal case does not become energized if an internal fault occurs.
As for when to use these connections:
- AC-In PE Ground (C): This should always be used for grounding the AC input side of the inverter.
- Primary Ground Connection M6 (PE) (F): This should be used to ground the inverter’s chassis itself.
In many installations, it’s common to use both grounding points in tandem to ensure comprehensive safety.
The AC-In PE ground provides a path for fault currents from the AC supply, while the primary ground connection protects against internal inverter faults and ensures the chassis remains at earth potential.
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