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Collect from Solarmax Inverters and send the data to your cloud using Ardexa

Project description

# Purpose The purpose of this project is to collect from Solarmax Inverters and send the data to your cloud using Ardexa. Data from Solarmax solar inverters is read using an RS485 connection and a Linux device such as a Raspberry Pi, or an X86 intel powered computer.

## Install On a raspberry Pi, or other Linux machines (arm, intel, mips or whetever), make sure Python is installed (which it should be). Then install using pip as follows: sudo pip install solarmax-ardexa

If it is already installed, and you need to upgrade, then do this: sudo pip install solarmax-ardexa –upgrade. The latest version of the package can be found here:

## How does it work This application is written in Python, to query Solarmax inverters connected via RS485. This application will query 1 or more connected inverters at regular intervals. Data will be written to log files on disk in a directory specified in the script. Usage and command line parameters are as follows:

Usage: solarmax_ardexalog {serial device} {Addresses} {log directory} {required_csv_value}, where… - {serial device} = ..something like: /dev/ttyS0 - {Addresses} = As a range (eg; 1-32) or a list (eg; 2,5,7,9) of the RS485 address - {log directory} = logging directory - {required_csv_value} = KDY,IL1,IL2,IL3,PAC,PDC,TNF,TKK,SYS,KHR,KMT,KLM,UL1,UL2,UL3,PRL (these are acronyms which detail which values to call down from the inverter. The actual values which are available are shown starting in Line 47 of the script - eg: solarmax_ardexa -v log /dev/ttyS0 1-5 /opt/ardexa/solarmax KDY,IL1,IL2,IL3,PAC,PDC,TNF,TKK,SYS,KHR,KMT,KLM,UL1,UL2,UL3,PRL - Note the use of the -v option in the above command to show debug messages. Use -vv for more verbose debug messages

## RS485 to USB converter Solarmax inverters can use RS485 as a means to communicate data and settings RS485 is a signalling protocol that allows many devices to share the same physical pair of wires, in a master master/slave relationship See -> for further information

When an RS485 to USB converter has been plugged in, on Linux systems the device will connect to something line /dev/ttyUSB0. To check: ` sudo tail -f /var/log/syslog ...then plug in the converter ` You should see a line like: usb 1-1.4: ch341-uart converter now attached to ttyUSB0 This means that the RS485 serial port can be accessed by the logical device /dev/ttyUSB0 Alternatively, try: dmesg | grep tty

## Inverter to RS485 (DB9) Physical Connection If your computer has an RS485 port, then the inverter can be connected directly to this port. The inverter is connected using 3 wires to the RS485 DB9 port on the computer. DO NOT connect the inverter RS485 to a RS232 port. They are not voltage compatible and damage will probably occur. For this to happen, you need a devices like these: - - -

Each and every RS485 port that uses DB9 has a different pinout. So you have to read the actual manual for the physical RS485 port you are using. For example; if using the Advantech UNO 2362G, the following pins are used: Pin1 = D- , Pin 2 = D+ and Pin 5 = GND. All other pins are not connected, so do not connect any other pins. So to wire it all up: - Make sure the Advantech is turned off - D+ Pin from the Solarmax Inverter (should be Pin 2 on the RS485 inverter interface) to Pin 2 of the RS485 DB-9 (Female) on the Advantech UNO 2362G - GND Pin from the Solarmax Inverter (should be Pin 5 on the RS485 inverter interface) to Pin 5 of the RS485 DB-9 (Female) on the Advantech UNO 2362G - D- Pin from the Solarmax Inverter (should be Pin 7 on the RS485 inverter interface) to Pin 1 of the RS485 DB-9 (Female) on the Advantech UNO 2362G

Confirm the physical serial port by running the command dmesg | grep tty. As stated previously, it should return something like /dev/ttyS1 if using a serial com port, or something like /dev/ttyUSB0 if using a 485/USB serial converter.

## Collecting to the Ardexa cloud Collecting to the Ardexa cloud is free for up to 3 Raspberry Pis (or equivalent). Ardexa provides free agents for ARM, Intel x86 and MIPS based processors. To collect the data to the Ardexa cloud do the following: a. Create a RUN scenario to schedule the Ardexa Solarmax script to run at regular intervals (say every 300 seconds/5 minutes). b. Then use a CAPTURE scenario to collect the csv (comma separated) data from the filename {log directory}. This file contains a header entry (as the first line) that describes the CSV elements of the file.

## Help Contact Ardexa at, and we’ll do our best efforts to help.

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