Small School network - 53.5V PoE switch, 3 APs, Media converter and Cloud Key

You can see the school's review of the Power-Buddie on their Facebook page

Backup Power for 4.75 hours

Device List:

Function Device Model Volt Rating Wh
PoE Switch TPLink NET-TL-SG1008P 53.5V 1.31A 70
Fibre Converter TPLink TPLink 9V 0.6A 5.4
Cload controler Ubiquiti Cloud Key Gen1 N/A N/A 5
Access Point X 2 Ubiquiti UAP-AC-LR N/A N/A 2 X 6.5 
Access Point Ubiquiti U6 Mesh N/A N/A 11.4

  • 53.5V 8 port PoE Switch connected to the 48V DC power port
  • Fibre media converter connected to 9V port
  • 1 X Ubiquiti U6 Mesh connected to switch PoE port
  • 2 X Ubiquiti UAP-AC-LR connected to switch PoE port
  • 1 X UniFi Cloud Key connected to PoE port

For the above mentioned scenario, the Power Buddie DC UPS 75Wh (24000 mAh) provided backup power for 285 minutes.

Why does it appear that the UPSes are performing far better than what they are rated for? Most devices, although not always the case, use substantially less Watts than their maximum rating. Hence why it seems that the UPSes are performing better than expected. The UPS reached a maximum of 21W during startup and averaged between 17 and 18W.