Applies to Models: PoE NVR including XRN-410S/810S and QRN-410S

Summary:

PoE NVR above mentioned models seems to work fine with 12V 
although the specification of it is to use 54V in the beginning. 
but once there are extra HDD(more capacity and number) or more camera, 
then PoE NVR goes out of power quickly its because 54V DC adaptor wasn't used 
as its guided in manual and specification

Solution :

1. Please see the manual or data sheet(specification) of PoE NVR to find whats right power supply

2. Please make sure to use right power supply

3. Do not use 12V for PoE NVR that actually needs 54V power supply its because it seems to work fine in the beginning.