Ed, The DC-DC is the isolation. There is no electrical connection from the pack side to the 12v side.
Steve In a message dated 10/9/2002 12:49:23 PM Eastern Standard Time, [EMAIL PROTECTED] writes: >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 > >
