Victron energy Orion-Tr Smart 24/12-30A Manuel page 6

Remote on-off
Use the remote function to enable and disable the converter
remotely with the remote on/off connector or using the
VictronConnect app. Typical use cases include a user operated
hard wired switch and automatic control by for example a Battery
Management System. If the minus of the service battery is not at
the same potential as the minus of the alternator or starter battery
an isolated remote on/off cable between the BMS and the on/off
port is required, see chapter 4.4 for details.
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