Only released in EOL distros:
Package Summary
MPPT message sender package
- Maintainer status: maintained
- Maintainer: aaronpb <aaronpb AT todo DOT todo>
- Author: Aaron PB
- License: GNU GPL v3.0
- Source: git https://github.com/AaronPB/ros_mppt.git (branch: master)
Contents
MPPT ROS Package
Introduction
The aim of this package is to send splitted data from a MPPT device in ros. The package reads holding values from the MPPT, which are sent using ve-direct protocol via serial USB port.
Installation
From the distro repo
sudo apt-get install ros-kinetic-ros_mppt
From sources
Clone the package from github repo into your catkin workspace and build as usual
$ git clone https://github.com/AaronPB/ros_mppt.git
Customize the sender
Depending on the interested values from the serial communication interface, it is possible to define more values into the package.
MPPT Values:
Label |
Units |
Description |
Type of variable |
V |
mV |
Main (battery) voltage |
Float |
I |
mA |
Battery current |
Float |
VPV |
mV |
Panel voltage |
Float |
PPV |
W |
Panel power |
Float |
PID |
|
Product ID |
String |
SER# |
|
Serial Number |
String |
HSDS |
|
Day sequence number (0 ... 364) |
Int |
MPPT |
|
Tracker operation mode |
Int |
ERR |
|
Error code |
Int |
CS |
|
State of operation |
Int |
H19 |
0.01 kW/h |
Yield Total (user resettable counter) |
Float |
H20 |
0.01 kW/h |
Yield today |
Float |
H21 |
W |
Maximum power today |
Float |
H22 |
0.01 kW/h |
Yield yesterday |
Float |
H23 |
W |
Maximum power yesterday |
Float |
Add the interested values into vemppt_ros
Choose those values you want to send from the topic, and modify the python file "vemppt_ros.py" adding them with this structure:
First, define the value where the other ones are already be defined:
Then, add into the while loop the following lines of code:
The first line is the filter, the "important filters" are already made so you only need to put the label of the value into a string (see the example).
The other line you have to care about, is the value of the splitted data. Define it following the MPPT values table.
Example
Imagine you want to see the error codes that the mppt is sending.
First, we define it in the predefined msg values section in vemppt_ros.py as msg.error_mppt:
Then, we add the following lines of code into the while loop:
1 elif "ERROR" in ve_read: #Filter with "ERROR" label
2 try:
3 ve_read = ve_read.split("\t") #Splitter (nothing changed)
4 msg.error_mppt = int(ve_read[1]) #Value of splitted data (no operations needed, and defined as an integer)
5 except Exception as e: logging.error('Exception ocurred in ERROR', exc_info=True) #Log info register in case of error ("V" modified to "ERROR")
The modified sender() method will looks like the following code:
1 """
2 This file is part of ros_mppt.
3 ros_mppt is free software: you can redistribute it and/or modify
4 it under the terms of the GNU General Public License as published by
5 the Free Software Foundation, either version 3 of the License, or
6 any later version.
7 ros_mppt is distributed in the hope that it will be useful,
8 but WITHOUT ANY WARRANTY; without even the implied warranty of
9 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10 GNU General Public License for more details.
11 You should have received a copy of the GNU General Public License
12 along with ros_mppt. If not, see <https://www.gnu.org/licenses/>.
13 """
14
15 def sender():
16 pub = rospy.Publisher('mppt_channel', mppt, queue_size=10)
17 rospy.init_node('ros_mppt', anonymous=True)
18 r = rospy.Rate(10)
19 msg = mppt()
20
21 #Predefined values of msg
22 msg.v_bat = -1
23 msg.i_bat = -1
24 msg.v_pv = -1
25 msg.p_pv = -1
26 msg.error_mppt = 0
27
28 while not rospy.is_shutdown():
29
30 try:
31 ve_read = ser.readline().decode("utf-8")
32 except: logging.warning('Skipping decoding from ve_read line: ' + ve_read)
33
34 if "V" in ve_read and "P" not in ve_read:
35 try:
36 ve_read = ve_read.split("\t")
37 msg.v_bat = float(ve_read[1]) * 0.001
38 except Exception as e: logging.error('Exception ocurred in V', exc_info=True)
39 elif "I" in ve_read and "P" not in ve_read:
40 try:
41 ve_read = ve_read.split("\t")
42 msg.i_bat = float(ve_read[1]) * 0.001
43 except Exception as e: logging.error('Exception ocurred in I', exc_info=True)
44 elif "VPV" in ve_read:
45 try
46 ve_read = ve_read.split("\t") * 0.001
47 msg.v_pv = float(ve_read[1])
48 except Exception as e: logging.error('Exception ocurred in VPV', exc_info=True)
49 elif "PPV" in ve_read:
50 try:
51 ve_read = ve_read.split("\t")
52 msg.p_pv = float(ve_read[1])
53 except Exception as e: logging.error('Exception ocurred in PPV', exc_info=True)
54 #Our new mppt value
55 elif "ERROR" in ve_read:
56 try:
57 ve_read = ve_read.split("\t")
58 msg.error_mppt = int(ve_read[1])
59 except Exception as e: logging.error('Exception ocurred in ERROR', exc_info=True)
60
61 rospy.loginfo(msg)
62 pub.publish(msg)
63 r.sleep()
Now, we have our new custom value created. But, we need to do something else to send it to the topic: define it in the .msg file.
Add new values in the .msg file
If you want to add more custom values to the mppt_channel topic you have to defined those in the .msg file. Go to msg/mppt.msg in your catkin workspace and add the new custom values into them:
float64 v_bat float64 i_bat float64 v_pv float64 p_pv
Following our previous example, we need to define msg.error_mppt into the mppt.msg file (as an integer):
float64 v_bat float64 i_bat float64 v_pv float64 p_pv int32 error_mppt
You can also define your own custom values just as state values or anything else. More info of .msg files at the Documentation section.
Run ros_mppt
To run the package first make sure to build it (also important if you made any changes at vemppt_ros.py):
$ cd ~/catkin_ws $ catkin_make $ . ~/catkin_ws/devel/setup.bash
Then, just run roscore and vemppt_ros.py:
$ rosrun roscore $ rosrun ros_mppt vemppt_ros.py
If you want to save the topic, you can use the rosbag command:
$ rosbag -a
More info about ros commands at the Documentation section.
Documentation
GitHub Repositories
vemppt_reader MPPT data registration into a xls file for experimental purposes.
ros_mppt MPPT ROS package.
Victron Energy Documents
VE Direct Protocol
[PDF] VE.Direct Protocol VE.Direct Protocol - Version 3.25.
[PDF] BlueSolar HEX BlueSolar HEX protocol MPPT.
[WIKI] MPPT Solar Charger Error Codes
