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What is the Function of the ‘Ground Relay’ in Victron MultiPlus Inverter Setting
I’ve come across a setting called ‘Ground Relay’ in the VictronConnect app under the ‘Inverter’ section, after connecting my Multiplus-II to my computer, using the MK3 USB interface device. Can you explain how this feature works within my inverter’s operation, especially concerning the neutral to protective earth (PE) link?
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The ‘Ground Relay’ in your Victron MultiPlus inverter settings is a crucial component that manages the connection between the inverter’s neutral point and the protective earth (PE) during different operational modes.
Functionality: Here’s what happens with the ground relay during the operation of your inverter/charger:
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When the inverter is operating in inverter mode (meaning it is not receiving AC input), the internal transfer switch is open, and the ground relay connects the Neutral of the inverter to PE. This ensures proper grounding within the inverter itself, which is essential for safety.
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When the inverter receives AC input and the transfer switch closes (transferring AC input to the output), the ground relay will first disconnect the Neutral from PE before the switch closes. This prevents any potential ground loops or electrical interference between the grid’s neutral and the inverter’s internal grounding system.
Safety and Regulations:
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This feature is particularly important in systems with earth-leakage circuit breakers, which are designed to prevent electric shock by breaking the circuit if a fault is detected.
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The correct operation of the ground relay ensures that these safety mechanisms can function properly.
Warning for 120/240V Models:
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If you disable the ground relay on models designed for split-phase systems (commonly referred to as “120/240V” systems), it will result in the disconnection of the L2 output from the inverter.
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This could lead to a partial loss of power where certain circuits will not receive power from the inverter.
The ground relay setting is typically managed automatically by the inverter system, but it can be manually enabled or disabled to suit specific installation needs.
Understanding and correctly setting the ground relay is essential for maintaining electrical safety and ensuring compliance with local wiring regulations.
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