I've seen numerous discussions about 'pre-charge' for inverters. It would seem to me that if this is necessary it would be handled trivially in the inverter with a relay, and a ballast resistor in front of the 48v caps. As soon as the caps hit the proper voltage level, the relay kicks on bypassing the ballast resistor. Same principle as a "Power Good" circuit on most electronics boards, only with a relay instead of an IC. I would consider this a design flaw if this was necessary to prevent damage or creating a fault, to a battery/ on a BMS. Having to manually "pre-charge" an inverter sounds pathetic.