It will work but it seems most would recommend against going without it. They will ask what happens if your DC/DC dies. I am not sure that is a valid argument as there are a lot of components in our EV's that don't have a backup.I was wondering, because I've had a hard time finding info, if the aux 12V battery is really necessary? Would an EV work with just the DC/DC converter alone, or does that cause issues with the contactor/precharge business? Also, it seems the precharge resistor is something I overlooked in my purchasing. What should I look for, or can someone link me to a good one to buy?
Personally, I just got a small 12V sealed battery from a wheel chair. My local battery goes through their cores and sells anything that tests OK for next to nothing. I am using that. I don't like to leave me DC/DC on when the car is not in use. I feel like it is draining energy from the pack. I am not sure if that is a valid concern but it always worries me. My range was really bad once after letting my car sit for a week and I blame it on that. I use the SLI to keep the memory in my clock and radio. It is also there to make sure I have enough power to turn on the relay which turns on my DC/DC when I turn the key on.