With IPHost Network Monitor you can run simple snmp requests against a D-Link device in your network.
swPoESystemInfoPowerConsumption
Switch PoE System Info Power Consumption
1.3.6.1.4.1.171.12.24.2.1.1.2
The actual momentary power consumption (in watts) in the PoE system.
Back to PoE-MIB MIB page.
IPHost Network monitor allows you to monitor swPoESystemInfoPowerConsumption on D-Link device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring D-Link switches right now.