Question: how do you isolate your system when the pack is attached to DC/DC and 12v is always on?
-Ed T -----Original Message----- From: Seth Murray [mailto:[EMAIL PROTECTED]] Sent: Wednesday, October 09, 2002 10:20 AM To: [EMAIL PROTECTED] Subject: Re: Yet another charger question unless I'm mistaken, what Rich is saying is that if you properly design the car, isolating the charger isn't really an issue. The reasons for isolating your battery pack from the frame and body of the car is, of course, to prevent electric shock of the innocent bystander or yourself. Your main battery pack should not be connected directly to the frame of the car, obviously, but in addition to that, there are a few other ways in which your traction pack could become connected to your frame, posing a potential issue. The simplest reason is through faulty wiring, second, battery shmutz makes the connection through your batt boxes, and third, which Rich was indirectly mentioning, is through carbon dust buildup in the motor. In a properly designed car, both sides of your traction pack are disconnected from the drive system (and hence the motor) when the car is turned off, eliminating the potential for there to be a connection through the motor. Have dual contactors, do your wiring well, take care of your batteries (or use sealed ones), and your pack is completely isolated from the frame of your car, hence no issue with charging. Am I mostly right here? Personally, I think I would use a GFI breaker with my future PFC, just in case. Seth
