Victron Energy ORION-Tr Isolated Charger Remote Cable for use with Isolated DC-DC Chargers ASS070300100
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In the Orion-Tr Isolated DC-DC Chargers, the remote on/off circuit is referenced to the primary battery (e.g. starter battery).
The Orion-Tr DC-DC Charger Isolated remote cable is intended for applications where the remote on/off signal is referenced to the secondary battery (e.g. lithium battery with BMS).