In my knowledge, the UPS has a USB interface for Power Management by one device, like a server or NAS. I am joy sure you can use the SNMP protocol over USB
I finally bought this APC Back UPS Pro RS900MI for my two Synology 918+ and 920+ servers. Each server uses about 5% of the UPS capacity, so 10% of the total load for both servers, which gives me about 50 minutes of autonomy in case of an outage. This is much more than I expected, so great. The 918+ is connected to the UPS via USB and the 920+ to the 918+. The setup works great but my only challenge is that I would like the two servers to be independent. Is SNMP available on this UPS (APC Back UPS Pro RS900MI) or do I need to add an interface?
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