With IPHost Network Monitor you can run simple snmp requests against a Huawei device in your network.
envMonVoltageBoardIndex
Environment Monitor Voltage Board Index
1.3.6.1.4.1.207.8.4.4.3.10.2.1.1
The index of the board hosting this voltage sensor in the board table.
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IPHost Network monitor allows you to monitor envMonVoltageBoardIndex on Allied Telesis device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Allied Telesis switches right now.