Absolutely. Of course I wouldn't want to bet the cost of slagging the converter in your car on any auxiliary batteries "protecting" whatever it is that is limiting 100A out. Anything you discharge (batteries or caps) will also need to be charged and may try to draw pretty hard.do i need to ground the 12v- from the backp battery to my car body too?
Here's another thought, buy yourself one of those Soundigital high voltage 100KW amps and use it directly to your 400V battery. That'll get you loud and you can leave out the silly converter entirely.4000$ the dc dc converter... so i need to be very cauttionus
So actually less than those Brazilian high voltage amps. LOL. Not like you'd use even 1/5th of that power for more than a few seconds on a burp and yes, high voltage is very scary! Just throwing it out there since you seem to be a ready-fire-aim kind of guy.my motor its a little 80000w