Thanks...Woops yes, I forgot to include an error amplifier which would kick in if Vin to any converter fell to 250V, and it would start pegging back its output as the vin fell to 250V and lower….so as to allow redundant units to come back in and stop their input capacitor over charging.
..Also would have a micro on the output of each converter to measure output current, then do “drooping”, ie dynamically change the Vout error amplifier reference so that from zero load to full load, Vout would go from 50V to 48V…this to encourage sharing, (as Easy Peasy has previously kindly described albeit in a very different situation).