LED Video Wall Power Supply
Since your application demands up to 2kVA LVDC   this NEC class 2 of product is not desirable.  You want a LED driver that is UL60950-1 compliant and 48V is a wise choice since 50A cables are rather heavy gauge. Look harder for an opportunity to locate it close to the load.

Without more details I might suggest 48V LED strings with http://www.meanwell.com/productPdf.aspx?i=366  Does this work for you??
Have a hot spare for reliability or current sharing.