Samlex UPS

Samlex makes a line of rack-mount inverters with a web management console and respond to SNMP requests. Their PSR-1200-24 and -48 models. They supply the MIB on an included USB thumb drive. If you lose it you may never find it again on the web. Here’s a copy just in case.

Download

If you probe them without the MIB or knowing their enterprise OID, you don’t get much back.

snmpwalk -v2c -c public your.samlex.ip

However, you can probe the enterprise section and you’ll see they have thier own section with some 64 values and traps.

snmpwalk -v2c -c public your.samlex.ip 1.3.6.1.4.1

To make sense of these, you’ll need that MIB file from above.

snmpwalk -v2c -c public -m ./SAMLEXAMERICA-MIB.txt your.samlex.ip 1.3.6.1.4.1

The most useful values are probably the ones that tell you:

• which system is this (sysLocation)
• are you on battery or grid right now (inverterMode)
• what is your battery voltage (vin)
• what is your grid voltage (gridvout)
• how much power you’re putting out (power)
• what your temps are (tempDD tempDA)

You can pull those in a loop like so

while read X;do 
        snmpget -v2c -m +./SAMLEXAMERICA-MIB.TXT -c public $X \
                sysLocation.0 inverterMode.0 vin.0 gridvout.0 power.0 tempDD.0 tempDA.0
         echo
done < file_of_device_IPs

You can also pull this into Prometheus

https://samlexamerica.com/wp-content/uploads/2021/08/11001-PSR-1200-24-48-0821_Lrez.pdf