Welcome to the forum Turgineer.
The hard wire kit should have a selector( slide 4 position switch ) for low voltage cut off, the values are normally 11.8 - 12.0 - 12.2 - 12.4 Volts ( not lower than 12.2 is recommended for lead acid batteries, this is considered 50 % depleted battery and should not eat too much into battery life expectancy )
It is a bit different how dashcams handle events.
Some will give you a few seconds buffer from before the triggering event, and then stop again some seconds after the event.
Some save segments, so say you are set up to 3 minutes, the camera would lock the current file and you will have ? seconds from before the actual event ( this could be 1 second to 2 minutes 59 seconds before the trigger event.
Yet others that do that will save 2 segments, so say 3 minute files again, if the trigger happen 1 minute into the current segment it will lock this current segment and the previous one, and you would have 4 minutes before and 2 minutes after.
On the other hand if you are 2 minutes into the current segment and the trigger happen, current segment will be saved + the following one, and so you will have 2 minutes from before event and 4 minutes after.
Mind you this 2 segment way ( which i very much like ) i dont think anyone use today, but it was how the dead brand Street guardian did it.
M y preferred parking guard mode is low bitrate, it always record so you miss nothing, it have sound too, and as it is low bitrate the file size are much smaller than the conventional recordings.
Parking guard of course are subject to environmental influences, as you know a car parked in the sun can get very warm, and electronics can only handle so much heat, so parked in the sun a dashcam no matter the parking mode might well shut down after a while to protect itself.
Only very few dashcams today will come back on once temperature is lower again, for the most it is a permanent stop to recordings / function, until you get in the car and turn it on which sort of reset everything and you of course have normal operation from the get go.
If your model is a battery type system, well it have a little Lipo battery inside, these often die rather fast as they are not made to handle severe heat or cold, hence why we generally recommend systems with capacitors for emergency power inside.
