NOTE: *The CNX-P2140 is designed to operate with a “nominal” +12VDC or +24V input from a car battery or alternator. This input voltage can vary significantly from a low of +7.5VDC during engine cranking at cold temperatures, to +34VDC during jump starting or abnormal alternator “spikes”. The CNX-P2140 can operate under full load with an input voltage of less than +10.5VDC for the duration of engine cranking. It is NOT designed to take a continuous input voltage of less than +12VDC for an extended period of time while under heavy load. If the input voltage drops below the nominal low battery threshold (~+10.5VDC) for more than 10 seconds, the CNX-P2140 shutdown controller will go into “Forced Shutdown” mode which will turn off the CarPC after a 30 second delay. Since the user has control over low battery threshold, care must be taken to protect the P2140 from prolonged operation below +10.5V.