yum install OpenIPMI ipmitool
systemctl enable ipmi.service
service ipmi start

# ipmitool sdr type "Power Supply"
PS Redundancy    | 74h | ok  |  7.1 | Fully Redundant
Status           | 62h | ok  | 10.1 | Presence detected
Status           | 63h | ok  | 10.2 | Presence detected

Nagios/Icinga plugin to check IPMI sensors

yum -y install perl-IPC-Run freeipmi
cd /usr/lib64/nagios/plugins/
wget https://raw.githubusercontent.com/thomas-krenn/check_ipmi_sensor_v3/master/check_ipmi_sensor
chmod +x check_ipmi_sensor
/usr/sbin/ipmi-sel --clear

# /usr/lib64/nagios/plugins/check_ipmi_sensor -T 'Power_Supply'
Sensor Type(s) Power_Supply Status: OK | 'Current Power'=150

# /usr/lib64/nagios/plugins/check_ipmi_sensor -T 'Power_Supply' -v
Sensor Type(s) Power_Supply Status: OK | 'Current Power'=152

# /usr/lib64/nagios/plugins/check_ipmi_sensor -T 'Power_Supply' -vv
Sensor Type(s) Power_Supply Status: OK | 'Current Power'=158
PS Redundancy = 'Fully Redundant' (Status: Nominal)
Status = 'Presence detected' (Status: Nominal)
Status = 'Presence detected' (Status: Nominal)

# /usr/lib64/nagios/plugins/check_ipmi_sensor -T 'Power_Supply' -vvv
...
ID  | Name          | Type         | State    | Event
118 | PS Redundancy | Power Supply | Nominal  | 'Fully Redundant'
119 | Status        | Power Supply | Nominal  | 'Presence detected'
120 | Status        | Power Supply | Nominal  | 'Presence detected'

--------------------- end of debug output ---------------------
Sensor Type(s) Power_Supply Status: OK | 'Current Power'=148
PS Redundancy = 'Fully Redundant' (Status: Nominal)
Status = 'Presence detected' (Status: Nominal)
Status = 'Presence detected' (Status: Nominal)