Mi Solar Monitor-ISO SNMP User Manual page 3

Mi
Solar Monitor -ISO
SNMP
The unit supports SNMP V1 and SNMP V2C communication platform to be
compatible with SNMP monitoring software platforms and the free Mi-SNMP Monitor
software for Microsoft Windows.(download from
https://microinstruments.co.za/software.html)
The Solar Monitor system functions on 12V and 24V battery bank systems only
The Solar Monitor can also be easily connected to the external optional 5 way relay
module to reset or control equipment at the remote site through the Relay port.
The unit also have a potential free normally closed alarm contact input, this can
assist with attempted solar panel theft by connecting an Alarm magnetic reed switch
to the alarm input.
The system can also report both battery voltages separately as well as the total
voltage for a 24V system if the 12V centre tap wire is connected-**see system
connections page.
Solar Panel voltage not monitored !
Some Solar Regulators are common negative regulators where the positive line
from the PV input is being controlled to the charge output, other regulators are
common positive regulators where the negative line is being controlled from the PV
input to the charge output.
The problem comes in with Common positive regulators that controls the negative
input line of the solar panel, the moment the negative from the solar panel is
connected to the system ground in order to measure the solar panel input voltage, a
direct path between negative coming from the solar panel and the battery negative is
established resulting in a direct connection between the solar panel and the battery
and is actually "Bridging out" the control regulator resulting in over charging of the
batteries.
Thus we don't measure the PV input voltage but the PV input amps only.
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