# Victron Energy Battery PYMODBUS error **URL:** \ **Category:** Integrations\ **Tags:** modbus, victron, battery, emoncms\ **Created:** [9 June 2023 15:10 UTC](https://community.openenergymonitor.org/t/victron-energy-battery-pymodbus-error/23711 "2023-06-09T15:10:37Z")\ **Posts on this page:** 20\ **Page:** 1
**Author:** ![BenWarwIck](https://community.openenergymonitor.org/letter_avatar_proxy/v4/letter/b/65b543/32.png) [@BenWarwIck](https://community.openenergymonitor.org/u/BenWarwIck)\ **Post date:** [9 June 2023 15:10 UTC](https://community.openenergymonitor.org/t/victron-energy-battery-pymodbus-error/23711/1 "2023-06-09T15:10:37Z")
Hi, I’ve got a battery and solar and been using the MySolarBattery app for some time with no issues. I’ve been pestering my installer (PureDrive) to help me get State of Charge info as I know they are using Victron Energy within the system. I’ve finally got the info I need and configured EmonModbusTcpInterfacer but I keep getting a “PYMODBUS NOT PRESENT BUT NEEDED !!” error. I’ve done a system update and also a “pip install -U pymodbus” and everything says pymodbus is installed but I still get the same error! Does it need to be in a certain directory and if so how do I move/install it there? Any help gratefully received as I’ve been trying for several hours now to resolve the issue! Thanks. ```auto 2023-06-09 15:26:43,606 INFO MainThread Creating EmonModbusTcpInterfacer 'ModbusTCP' 2023-06-09 15:26:43,607 ERROR MainThread PYMODBUS NOT PRESENT BUT NEEDED !! 2023-06-09 15:26:43,608 DEBUG MainThread Setting ModbusTCP register: 400267 2023-06-09 15:26:43,608 DEBUG MainThread Setting ModbusTCP nodeId: 12 2023-06-09 15:26:43,609 DEBUG MainThread Setting ModbusTCP pubchannels: ['ToEmonCMS'] 2023-06-09 15:26:43,610 DEBUG MainThread Setting ModbusTCP interval: 10 2023-06-09 15:26:43,615 DEBUG MainThread Automatic configuration of nodes enabled ``` ---
**Author:** ![Bill.Thomson](https://community.openenergymonitor.org/user_avatar/community.openenergymonitor.org/bill.thomson/32/1834_2.png) [@Bill.Thomson](https://community.openenergymonitor.org/u/Bill.Thomson)\ **Post date:** [9 June 2023 18:17 UTC](https://community.openenergymonitor.org/t/victron-energy-battery-pymodbus-error/23711/2 "2023-06-09T18:17:03Z")
`pip install -U pymodbus` installs `pymodbus` in a directory that’s not on the search path. Give this a try… First, uninstall pymodbus. `pip uninstall pymodbus` Then, re-install it like this: `sudo pip install -U pymodbus` ---
**Author:** ![BenWarwIck](https://community.openenergymonitor.org/letter_avatar_proxy/v4/letter/b/65b543/32.png) [@BenWarwIck](https://community.openenergymonitor.org/u/BenWarwIck)\ **Post date:** [10 June 2023 08:46 UTC](https://community.openenergymonitor.org/t/victron-energy-battery-pymodbus-error/23711/3 "2023-06-10T08:46:15Z")
Hi Bill. Thanks for the reply. I tried that but still getting the same error. The uninstall worked correctly, but the messages I got for the install were as follows… ```auto pi@emonpi:/ $ sudo pip install -U pymodbus Looking in indexes: https://pypi.org/simple, https://www.piwheels.org/simple Requirement already satisfied: pymodbus in /usr/lib/python3/dist-packages (2.1.0) Collecting pymodbus Using cached https://www.piwheels.org/simple/pymodbus/pymodbus-3.3.1-py3-none-any.whl (210 kB) Installing collected packages: pymodbus Attempting uninstall: pymodbus Found existing installation: pymodbus 2.1.0 Not uninstalling pymodbus at /usr/lib/python3/dist-packages, outside environment /usr Can't uninstall 'pymodbus'. No files were found to uninstall. Successfully installed pymodbus-3.3.1 ``` ---
**Author:** ![Bill.Thomson](https://community.openenergymonitor.org/user_avatar/community.openenergymonitor.org/bill.thomson/32/1834_2.png) [@Bill.Thomson](https://community.openenergymonitor.org/u/Bill.Thomson)\ **Post date:** [10 June 2023 15:31 UTC](https://community.openenergymonitor.org/t/victron-energy-battery-pymodbus-error/23711/4 "2023-06-10T15:31:46Z")
The last line says it sucessfully installed `pymodbus-3.3.1`. The “error” is complaining about not being able to find `pymodbus 2.1.0` to uninstall. (because it was uninstalled when you ran the `pip` uninstall command) > [@BenWarwIck](#): > > I tried that but still getting the same error. If it’s the “PYMODBUS NOT PRESENT BUT NEEDED !!” error you’re still getting, then I’ve run out of ideas. ☹ ---
**Author:** ![BenWarwIck](https://community.openenergymonitor.org/letter_avatar_proxy/v4/letter/b/65b543/32.png) [@BenWarwIck](https://community.openenergymonitor.org/u/BenWarwIck)\ **Post date:** [10 June 2023 16:05 UTC](https://community.openenergymonitor.org/t/victron-energy-battery-pymodbus-error/23711/5 "2023-06-10T16:05:11Z")
Yes it is the “PYMODBUS NOT PRESENT BUT NEEDED !!” error I’m still getting. I did a full reboot just to make sure it picked it up. Thanks for your help. Hopefully someone else might be able to point me in the right direction. I don’t really know what to do next in terms troubleshooting! ---
**Author:** ![BenWarwIck](https://community.openenergymonitor.org/letter_avatar_proxy/v4/letter/b/65b543/32.png) [@BenWarwIck](https://community.openenergymonitor.org/u/BenWarwIck)\ **Post date:** [10 June 2023 16:43 UTC](https://community.openenergymonitor.org/t/victron-energy-battery-pymodbus-error/23711/6 "2023-06-10T16:43:15Z")
At the top of `EmonModbusTcpInterfacer.py` there is a section as follows… ```auto import time import Cargo try: from pymodbus.constants import Endian from pymodbus.payload import BinaryPayloadDecoder from pymodbus.client.sync import ModbusTcpClient as ModbusClient pymodbus_found = True except ImportError: pymodbus_found = False ``` Then later on it says… ```auto if not pymodbus_found: self._log.error("PYMODBUS NOT PRESENT BUT NEEDED !!") ``` So it is these import functions that are going wrong! Not sure if that helps… ---
**Author:** ![Bill.Thomson](https://community.openenergymonitor.org/user_avatar/community.openenergymonitor.org/bill.thomson/32/1834_2.png) [@Bill.Thomson](https://community.openenergymonitor.org/u/Bill.Thomson)\ **Post date:** [10 June 2023 18:27 UTC](https://community.openenergymonitor.org/t/victron-energy-battery-pymodbus-error/23711/7 "2023-06-10T18:27:13Z")
An easy way to verify if the modules are indeed present, is to start python at a command prompt then import them. If the module exists, you’ll see something similar to this: ```python bt@trailer:~ $ python Python 2.7.18 (default, Jul 14 2021, 08:11:37) [GCC 10.2.1 20210110] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> import time >>> ``` If a module **isn’t** present on your system, you’ll get an error: ```python >>> import cargo Traceback (most recent call last): File "", line 1, in ImportError: No module named cargo >>> ``` ---
**Author:** ![BenWarwIck](https://community.openenergymonitor.org/letter_avatar_proxy/v4/letter/b/65b543/32.png) [@BenWarwIck](https://community.openenergymonitor.org/u/BenWarwIck)\ **Post date:** [10 June 2023 19:05 UTC](https://community.openenergymonitor.org/t/victron-energy-battery-pymodbus-error/23711/8 "2023-06-10T19:05:48Z")
Thanks Bill. I’ll give that a go tomorrow and see how I get on. ---
**Author:** ![Bill.Thomson](https://community.openenergymonitor.org/user_avatar/community.openenergymonitor.org/bill.thomson/32/1834_2.png) [@Bill.Thomson](https://community.openenergymonitor.org/u/Bill.Thomson)\ **Post date:** [10 June 2023 19:06 UTC](https://community.openenergymonitor.org/t/victron-energy-battery-pymodbus-error/23711/9 "2023-06-10T19:06:52Z")
![thumbsup](https://community.openenergymonitor.org/uploads/default/original/2X/3/3c587556c0cc11389317c03a60788d77ceebd307.gif) ![thumbs_up](https://community.openenergymonitor.org/uploads/default/original/3X/d/8/d8e66d6e7a955d91f407bd18c1689f01f267ea72.gif) ---
**Author:** ![borpin](https://community.openenergymonitor.org/user_avatar/community.openenergymonitor.org/borpin/32/193_2.png) [@borpin](https://community.openenergymonitor.org/u/borpin)\ **Post date:** [11 June 2023 19:20 UTC](https://community.openenergymonitor.org/t/victron-energy-battery-pymodbus-error/23711/10 "2023-06-11T19:20:30Z")
> [@BenWarwIck](#): > > So it is these import functions that are going wrong! Well no, they are not going wrong, it is telling you you have not got the package installed (so it is doing what it needs to do). @Bill.Thomson - this is not the right module. > @BenWarwIck Is this an old install of emoncms (not if it has not been updated, but was the original install a while ago)? There was an issue with all possible modules not being installed. To fix - ```auto cd /opt/openenergymonitor/emonhub/ git pull ``` Check there are no errors here (such as cannot update due to local changes) run the install script for emonhub ```auto ./install.sh ``` This should fix the issue. ---
**Author:** ![BenWarwIck](https://community.openenergymonitor.org/letter_avatar_proxy/v4/letter/b/65b543/32.png) [@BenWarwIck](https://community.openenergymonitor.org/u/BenWarwIck)\ **Post date:** [11 June 2023 19:39 UTC](https://community.openenergymonitor.org/t/victron-energy-battery-pymodbus-error/23711/11 "2023-06-11T19:39:01Z")
Hi @borpin . Thanks for you comments. It isn’t an old install. I re-did my install from a vanilla EmonSD install using the Nov22 version. Do you think I need to try the GitHub commands you mentioned as well first? It looks like this is updating Python and all the modules, or will the `git pull` do all that for me? Many thanks. ---
**Author:** ![borpin](https://community.openenergymonitor.org/user_avatar/community.openenergymonitor.org/borpin/32/193_2.png) [@borpin](https://community.openenergymonitor.org/u/borpin)\ **Post date:** [11 June 2023 19:40 UTC](https://community.openenergymonitor.org/t/victron-energy-battery-pymodbus-error/23711/12 "2023-06-11T19:40:42Z")
The `git pull` will ensure the files are all up to date and then run the `install` script. Odd it doesn’t work. ---
**Author:** ![BenWarwIck](https://community.openenergymonitor.org/letter_avatar_proxy/v4/letter/b/65b543/32.png) [@BenWarwIck](https://community.openenergymonitor.org/u/BenWarwIck)\ **Post date:** [11 June 2023 21:14 UTC](https://community.openenergymonitor.org/t/victron-energy-battery-pymodbus-error/23711/13 "2023-06-11T21:14:11Z")
@borpin still no joy. Still getting the `PYMODBUS NEEDED BUT NOT PRESENT !!`error which still seems to be triggered by those missing modules. I’ve included the return from the `git pull` below ```auto hint: Pulling without specifying how to reconcile divergent branches is hint: discouraged. You can squelch this message by running one of the following hint: commands sometime before your next pull: hint: hint: git config pull.rebase false # merge (the default strategy) hint: git config pull.rebase true # rebase hint: git config pull.ff only # fast-forward only hint: hint: You can replace "git config" with "git config --global" to set a default hint: preference for all repositories. You can also pass --rebase, --no-rebase, hint: or --ff-only on the command line to override the configured default per hint: invocation. Already up to date. ``` Then also an extract from the `./install.sh` command as well as the full extract below. As far as I can see it seems to think everything is up to date! ```auto python3-configobj is already the newest version (5.0.6-4). python3-pymodbus is already the newest version (2.1.0+dfsg-2). python3-serial is already the newest version (3.5~b0-1). ``` ```auto EmonHub directory: /opt/openenergymonitor/emonhub Apply raspberrypi serial configuration? (y/n): y Would you like to install emonhub under the pi user? (y/n): y Running apt update Get:1 http://raspbian.raspberrypi.org/raspbian bullseye InRelease [15.0 kB] Get:2 https://download.docker.com/linux/raspbian bullseye InRelease [26.7 kB] Hit:3 http://archive.raspberrypi.org/debian bullseye InRelease Get:4 https://packages.sury.org/php bullseye InRelease [6,841 B] Get:5 https://packages.sury.org/php bullseye/main armhf Packages [376 kB] Fetched 424 kB in 7s (61.5 kB/s) Reading package lists... Done Building dependency tree... Done Reading state information... Done 117 packages can be upgraded. Run 'apt list --upgradable' to see them. installing or updating emonhub dependencies Reading package lists... Done Building dependency tree... Done Reading state information... Done python3-configobj is already the newest version (5.0.6-4). python3-pymodbus is already the newest version (2.1.0+dfsg-2). python3-serial is already the newest version (3.5~b0-1). bluetooth is already the newest version (5.55-3.1+rpt2). libbluetooth-dev is already the newest version (5.55-3.1+rpt2). python3-pip is already the newest version (20.3.4-4+rpt1+deb11u1). python3-spidev is already the newest version (20200602~200721-1). 0 upgraded, 0 newly installed, 0 to remove and 117 not upgraded. Looking in indexes: https://pypi.org/simple, https://www.piwheels.org/simple Requirement already satisfied: paho-mqtt in /home/pi/.local/lib/python3.9/site-packages (1.6.1) Requirement already satisfied: requests in /usr/lib/python3/dist-packages (2.25.1) Requirement already satisfied: pybluez in /home/pi/.local/lib/python3.9/site-packages (0.23) Requirement already satisfied: py-sds011 in /home/pi/.local/lib/python3.9/site-packages (0.9) Requirement already satisfied: sdm_modbus in /home/pi/.local/lib/python3.9/site-packages (0.6.1) Requirement already satisfied: minimalmodbus in /home/pi/.local/lib/python3.9/site-packages (2.0.1) Requirement already satisfied: pyserial>=3.0 in /usr/lib/python3/dist-packages (from minimalmodbus) (3.5b0) Requirement already satisfied: pyserial-asyncio>=0.6.0 in /home/pi/.local/lib/python3.9/site-packages (from sdm_modbus) (0.6) Requirement already satisfied: pymodbus>=3.0.0 in /usr/local/lib/python3.9/dist-packages (from sdm_modbus) (3.3.1) Looking in indexes: https://pypi.org/simple, https://www.piwheels.org/simple Collecting https://github.com/openenergymonitor/rpi-rfm69/archive/refs/tags/v0.3.0-oem-4.zip Using cached https://github.com/openenergymonitor/rpi-rfm69/archive/refs/tags/v0.3.0-oem-4.zip Installing build dependencies ... done Getting requirements to build wheel ... done Preparing wheel metadata ... done Requirement already satisfied: RPI.GPIO in /usr/lib/python3/dist-packages (from rpi-rfm69==0.3.4) (0.7.0) Requirement already satisfied: spidev in /usr/lib/python3/dist-packages (from rpi-rfm69==0.3.4) (3.5) installing or updating raspberry pi related dependencies Looking in indexes: https://pypi.org/simple, https://www.piwheels.org/simple Requirement already satisfied: RPi.GPIO in /usr/lib/python3/dist-packages (0.7.0) Disabling Bluetooth Stop Bluetooth modem Remove console from /boot/cmdline.txt Stop and disable serial service Unit /etc/systemd/system/serial-getty@ttyAMA0.service is masked, ignoring. /etc/emonhub directory already exists Setting ownership of /var/log/emonhub to pi Setting ownership of /var/log/emonhub/emonhub.log to pi and permissions to 644 Installing /usr/local/bin/emonhub symlink emonhub.service already installed - Service ActiveState=active ``` ---
**Author:** ![borpin](https://community.openenergymonitor.org/user_avatar/community.openenergymonitor.org/borpin/32/193_2.png) [@borpin](https://community.openenergymonitor.org/u/borpin)\ **Post date:** [12 June 2023 11:38 UTC](https://community.openenergymonitor.org/t/victron-energy-battery-pymodbus-error/23711/14 "2023-06-12T11:38:12Z")
That is odd. No time for me to test but @TrystanLea or @glyn.hudson mught chip in. @bwduncan is a Python man as well. I’ll have a look later. ---
**Author:** ![TrystanLea](https://community.openenergymonitor.org/user_avatar/community.openenergymonitor.org/trystanlea/32/31_2.png) [@TrystanLea](https://community.openenergymonitor.org/u/TrystanLea)\ **Post date:** [12 June 2023 14:38 UTC](https://community.openenergymonitor.org/t/victron-energy-battery-pymodbus-error/23711/15 "2023-06-12T14:38:48Z")
Hello @BenWarwIck Looks like there was a change in the pymodbus library 3.3 onwards. I’ve made a couple of changes to the interfacer that at least get past the error here, though I am not able to test it end to end here. EmonHub v2.5.8 ---
**Author:** ![BenWarwIck](https://community.openenergymonitor.org/letter_avatar_proxy/v4/letter/b/65b543/32.png) [@BenWarwIck](https://community.openenergymonitor.org/u/BenWarwIck)\ **Post date:** [12 June 2023 17:07 UTC](https://community.openenergymonitor.org/t/victron-energy-battery-pymodbus-error/23711/16 "2023-06-12T17:07:51Z")
Hi Tristan. Thanks for your help. Is that something I can update using the normal update within emonpi.local interface? Or should I do the `git pull` and `./install.sh` commands? ![Screenshot 2023-06-12 at 18.05.35](https://community.openenergymonitor.org/uploads/default/original/3X/e/7/e7ac6546e9b3e8390f5a90c668e717bf9b750f82.png) ---
**Author:** ![borpin](https://community.openenergymonitor.org/user_avatar/community.openenergymonitor.org/borpin/32/193_2.png) [@borpin](https://community.openenergymonitor.org/u/borpin)\ **Post date:** [13 June 2023 07:03 UTC](https://community.openenergymonitor.org/t/victron-energy-battery-pymodbus-error/23711/17 "2023-06-13T07:03:48Z")
> [@TrystanLea](#): > > EmonHub v2.5.8 @TrystanLea - from GitHub ![image](https://community.openenergymonitor.org/uploads/default/original/3X/4/e/4ea07c3686a7f1becd5519337fb2b5644c4b3022.png) ---
**Author:** ![borpin](https://community.openenergymonitor.org/user_avatar/community.openenergymonitor.org/borpin/32/193_2.png) [@borpin](https://community.openenergymonitor.org/u/borpin)\ **Post date:** [13 June 2023 07:06 UTC](https://community.openenergymonitor.org/t/victron-energy-battery-pymodbus-error/23711/18 "2023-06-13T07:06:29Z")
Yes a full update should pull it through. ---
**Author:** ![BenWarwIck](https://community.openenergymonitor.org/letter_avatar_proxy/v4/letter/b/65b543/32.png) [@BenWarwIck](https://community.openenergymonitor.org/u/BenWarwIck)\ **Post date:** [13 June 2023 18:04 UTC](https://community.openenergymonitor.org/t/victron-energy-battery-pymodbus-error/23711/19 "2023-06-13T18:04:49Z")
OK, so that has worked! Thanks for your help @TrystanLea and @borpin. However getting new error, which I don’t understand. It is saying `ModbusTCP You have define and equal number of registers and of names`. I don’t understand as I though I had. My config looks like this… ```auto [[ModbusTCP]] # this interfacer retrieves register information from modbusTCP clients # retrieve register information from modbus TCP documentation for your inverter. Type = EmonModbusTcpInterfacer [[[init_settings]]] modbus_IP = 192.168.0.141 # ip address of client to retrieve data from modbus_port = 502 # Portclient listens on [[[runtimesettings]]] # List of starting registers for items listed above register = 400267 # nodeid used to match with node definition in nodes section below. Can be set to any integer value not previously used. nodeId = 12 # Channel to publish data to should leave as ToEmonCMS pubchannels = ToEmonCMS, # time in seconds between checks, This is in addition to emonhub_interfacer.run() sleep time of .01 # use this value to set the frequency of data retrieval from modbus client interval = 10 [[12]] nodename = Batery_SOC [[[rx]]] # list of names of items being retrieved names = batterysoc datacodes = H scales = 1 units = % ``` I’m told by my provide that this register is for the Battery Soc (the only thing I’m missing for the MySolayBattery app. Is there any way to check? Should I just add other names and see what I get? ---
**Author:** ![borpin](https://community.openenergymonitor.org/user_avatar/community.openenergymonitor.org/borpin/32/193_2.png) [@borpin](https://community.openenergymonitor.org/u/borpin)\ **Post date:** [13 June 2023 20:31 UTC](https://community.openenergymonitor.org/t/victron-energy-battery-pymodbus-error/23711/20 "2023-06-13T20:31:21Z")
~~So the register number is usually one more than the Modbus address (register number starts at 1, address starts at 0). Try 400266.~~ This really does want the register number. -1 done in the code. Next thing to check is if it is Holding register (RW) or an Input register (RO). 16bit or 32 bit. Int, UInt or float. All makes a difference when decoding it! Do you have Node-RED or HomeAssistant running anywhere? [edit] emonhub only reads Holding registers. [Next page](https://community.openenergymonitor.org/t/victron-energy-battery-pymodbus-error/23711.md?page=2)