With IPHost Network Monitor you can run simple snmp requests against a Dell device in your network.
upsAdvInputMaxLineVoltage
ups Adv Input Max Line Voltage
1.3.6.1.4.1.318.1.1.1.3.2.2
The maximum utility line voltage in VAC over the previous 1 minute period.
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IPHost Network monitor allows you to monitor upsAdvInputMaxLineVoltage on Dell device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Dell firewalls right now.