User's Guide

External Power Control
Since the OVMSv3 module remains powered at all times, and the normal means for deducing
that a car has been turned off don't work on an EV (see PID #12, above), an external OBDII
device needs to be explicitly turned on and off. This is currently done with short event scripts.
The following commands configure the OVMSv3 to make the external 12v feed follow the
vehicle on/off state, or use the vfs edit command to create or modify the files:
vfs mkdir /store/events
vfs mkdir /store/events/vehicle.on
vfs mkdir /store/events/vehicle.off
vfs append 'power ext12v on' /store/events/vehicle.on/ext12v
vfs append 'power ext12v off' /store/events/vehicle.off/ext12v
OVMS v3 User Guide Page 78 / 86