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every now and then the connection between EM24 and Cerbo (Modbus TCP) hangs up.
Then the grid values in the Cerbo freeze and under certain circumstances the battery is drained and iced into the grid unnecessarily.
Hence my question whether you can install a watchdog in the Cerbo that checks whether the value of the grid meter changes over time.
Or maybe the EM24 will even send a keep alive signal which can be used. thanks Mario
I was experiencing the same issues, once draining the better part of my battery into the grid for no good reason but a stuck value.
I resolved to kill & restart the fronius-dbus script every 60 minutes. Works, no recognisable side effects so far.
As I am unsure how you configured the EM24 Modbus TCP connection, this might be a (ugly) hack to overcome the issue temporarily?
Keen to see a more elegant solution (and while writing, I think one could do with a bash script, checking the dbus values etc... need to think about that one).
Followup with an answer.
Just used some free minutes to craft an ugly script which does the job for my setup (using the dbus-fronius-smartmeter) - should be self-explanatory:
#!/bin/bash DBUS=/usr/bin/dbus DBUS_BASE=com.victronenergy.grid.ttyUSB0 DBUS_PATH=/Ac/Power # get first power value OLD_VAL=`$DBUS -y $DBUS_BASE $DBUS_PATH GetValue` # sleep for 10 seconds, then get next value sleep 10 CUR_VAL=`$DBUS -y $DBUS_BASE $DBUS_PATH GetValue` #check if both values are same - if so, kill/restart the service. if [ "$OLD_VAL" = "$CUR_VAL" ]; then /data/dbus-fronius-smartmeter/kill_me.sh fi
I run this script every minute from cron - easiest to have a semi-persistent setup for venus OS. Does the job - rather as a starting point, not as a ready to run solution.
Hope this helps
Nice and helpful little script.
I have found a little error on top of your script:
#!/bin/bash would be the correct path to bash.
Otherwise the cron daemon cannot find the correct interpreter.
kind regards
Sledgehoe
@Tom Büschgens kann ich Dir hier auch irgendwie eine pers. Nachricht zukommen lassen? Ich habe keine Ahnung wo Du den Cronjob laufen hast? Ist das auch auch der Cerbo möglich? Gruß und Danke Mario
kein Problem: sledge@seconet.de
Aber als grundsätzliche Problemlösung:
Also 2. / 3. sind eher Linux-spezifische Fragen, 1. dann vielleicht noch Venus OS :-)
Für Dein setup noch unklar: Wie restarte ich den Modbus TCP-Teil, damit der EM24 wieder richtig ausgelesen wird.
