No - your battery should not be showing 17v. How old is your car and more specifically, your alternator? The only batteries that you would put in your car that would show that are purpose built batteries SPECIFICALLY for SPL competition vehicles...they are 16v batteries.
As for the system turning off after 10 minutes...we need to know what it's doing. Does it hard shut off, does it go through the shut down procedure? Does the battery voltage correlate in any way with it shutting off (over voltage or under voltage?).