Tristart MPPT Charger


The purpose of this plugin is to collect data from Morningstar’s TriStar MPPT battery charger.


This plugin reads the data from Morningstar’s TriStar MPPT battery charger. It uses the Modbus TCP Specification, and collects from RS485 or TCP connected units. Data will be collected to the storage table, and will be run every 5 minutes, by default. This plugin relies on the Modbus Ardexa plugin. The following data is collected from the units:

Variable Name               Units
Battery Voltage             V
Array Voltage               V
Battery Current             A
Array Current               A
Heatsink Temp               °C
RTS Temp                    °C
Regulator Temp              °C
Fault Status
Charger Status


Arguments are as follows:

  • endpoint. This is either a serial device like /dev/ttyS0 or an IP or DNS like

  • bus_addresses. An RS485 address in the range 2-63. This can be a hyphenated list like 3-10 or a list like 2,5,7,9

  • --port. This is an optional parameter used in an Ethernet gateway, and is the TCP port used for the gateway. Default is 502

  • --attempts. This is an optional parameter, and determines how many times to times to attempt to read an inverter value. Default is 1

  • --delay. This is the delay in seconds between inverter send and receive commands, AND if attempts > 1. Fractions like 0.3 can be used. Default is 0.05

Last updated