It seems that SNMP value .1.3.6.1.4.1.14988.1.1.3.12.0 is power consumption
I’ve monitoring some CCRs running routeros6, and this value is returning about 300-400. I find that unlikely they are pulling 300 Watts but I haven’t put a meter across them – would I be right in assuming the units are in 1/10th of a Watt?
Have you considered reading the mib ?
And with it’s correct version of your device firmware ?
https://download.mikrotik.com/routeros/7.13.3/mikrotik.mib
And you maybe can read out mtxrHlVoltage(V) and mtxrHlCurrent (mA).
And you can then calculate the power for your self.
snmptranslate -On -m ./mikrotik.mib -IR mtxrHlVoltage
.1.3.6.1.4.1.14988.1.1.3.8
snmptranslate -On -m ./mikrotik.mib -IR mtxrHlCurrent
.1.3.6.1.4.1.14988.1.1.3.13
snmptranslate -m ./mikrotik.mib .1.3.6.1.4.1.14988.1.1.3.12
MIKROTIK-MIB::mtxrHlPower