Rcmu string solar inverter

4 FAQs about [Rcmu string solar inverter]

Do Solis inverters have a residual current monitoring unit?

Solis inverters have a residual current monitoring unit (RCMU) integrated inside which complies with the requirements of IEC 62109-1 and IEC 62109-2. In case of a sudden change in residual current, Solis inverters will disconnect from the grid within the following time specified in the table and show alarm code accordingly.

What is the rated residual current of a solar inverter?

The rated residual current of the residual-current device must be 30 mA or higher (for information on selecting a residual-current device, see Technical Information "Criteria for Selecting a Residual-Current Device" under ). Each inverter in the system must be connected to the utility grid via a separate residual-current device.

Do I need an external RCD with a Solis inverter?

External RCD may be required to be installed in some countries. Since Solis inverters by design is not able to feed in DC residual current to grid, Solis recommends installing external Type A RCD with Solis inverters and the recommended ratings are listed below:

Does the inverter need a residual-current device?

If the protection by automatic disconnection of supply according to DIN VDE 0100-410 is fulfilled by an appropriate overcurrent protective device, the inverter does not require an external residual-current device for safe operation. If local regulations require the use of a residual-current device, the following must be observed:

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