a 112 3-Phase 120V KVA transformer
You mean a 120V 3-phase 112kVA transformer?
For a start - whenever possible supply 208-240V to the PSU's. Less current draw means thinner wire can be used (cheaper) plus it is marginally more efficient.
kVA vs actual KW depends on the power factor of the PSU's but a good rule of thumb would be KW = kVA*0.9 (modern PSU's are power corrected to give 0.9 to 0.95PF). Typical wall plug power draw for an s9 is between 1,250w to over 1,300w depending on the model and ambient temp.