Victron energy Orion-Tr Smart 12/12-18, Manual

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4.4 Connection remote on-off
The recommended use of the remote on-off is:
a) A switch wired between the L-H pins (On-level impedance
between L-H pins: <500kΩ)
b) A switch wired between (input/starter) battery plus and H-pin
(on level: >3V)
c) A switch between the L-pin and (input/starter) ground (on level:
<5V)
Note: Voltage tolerance L & H pin: +/- 70V
DC
a) L-H pin wiring b) H-pin wiring c) L-pin wiring
Figure 3: Remote on/off connections
4.5 Engine detection override
Applying >7V to the L-pin of the remote on/off circuit activates the
“engine detection override” function. The charger is on as long as
the “engine detection override” is active. With this function an
external control (e.g. ignition switch, CAN bus engine on detector)
can determine if charging is allowed.
The remote on/off function also needs to be activated so option a)
or b) in figure 3 must also be connected. See examples in figure 4
below.