BTC-S37 Power supplies: DON'T use more than 1. This person melted part of their board.
From my Youtube video at https://youtu.be/M-_mJLptBXw
"psu 2 got very very hot and riser melted smoke! "
This question comes up so often I reproduced it here.
It's a BAD IDEA to use two power supplies on the boards where the power connectors are all tied together. Just don't do it. The only way would be to use a power balancing circuit but then monetarily it isn't worth it.
Read thru for my recommendation. Is 2400 watts enough? I got you.