Orion converters

Hello. I am working on converting my existing 12 v system to 48.
My main power draw at 12 v is hydraulic system.
I did instal 3 48 to 12 v converters.
I was able to get only 2 converters working at the same time ( verified by clamp meter), but when i try to tune the 3rd one it is always fails ( either this converter active, or 2 other active )
Question is it possible to set up them so all 3 converters were actually active all the time?
Example - when i turn on hydraulics there is about 1 sec ( maybe less) power loss that affects some electronics, i bypass it for now by adding 12 v battery to the circuit to avoid this spike. but if a can not make all 3 run at the same time( so they be ready when hydraulics kick and not having this power loss) , i do not need them and 1 converter and battery will be just enough. Right ?