My Orion Smart-Tr DC-DC makes loud and weird noise when the output starts, both the charge mode and power supply mode. See video.
This can't be normal? What could cause this, or what should I do?
Background: the Orion Smart-Tr 12/24 DC-DC in a camper van, charging the leisure battery (24V) from car battery (12V). Leisure battery also has other charging options (solar + Victron Skylla-IP44), and everything works well.
Edit: When it's on, I get 10-15 A current going out as seen and confirmed by the leisure battery BMS. So the unit seems to work, but I don't dare to use it in its current state.