Brief Description: Aux Battery Power and Bidirectional Zener Diodes
I failed my second Perihelion auxiliary battery power module. Both lasted about 10 or 15 hours. Perihelion's Eric Jones thinks that the aux power and master contactor field collapse is spiking (and sparking) the module, even though standard diodes were in place to help prevent that failure mode. I replaced the standard diodes with doubled bidirectional Zener diodes graciously provided by Perihelion (he markets them as "Snapjacks") in the hopes that I won't have any more failures, and I replaced the auxiliary batter power module.
Zener bidirectional (lower) and standard (upper) diodes