This product is either discontinued or we cannot get that from suppliers.
Ubiquiti EP-54V-150W-DC, Power DC/DC 150W for 22 - 60V Input, Voltage DC/DC for 22 - 60V Input, 54V Output, LED System On/Off.
The EP-54V-150W-DC is a DC to DC PSU module designed for use with the EdgePower EP-54V-150W. It can be used as a primary or auxiliary DC PSU to deliver 150W of power output or used as a backup to the primary PSU.