This site is now in read-only archive mode. Please move all discussion, and create a new account at the new Victron Community site.
I have a Cerbo GX and Phoenix 1200 inverter. My system is off grid, I monitor remotely with VRM.
Thing is, I get random (no pattern) low voltage alarms from the Phoenix 1200 every 2-10 days, sometimes none for 2-3 weeks, but then it'll happen again. It will be a low voltage alarm, showing 11.5V or something.
I go into the history of voltage and SOC using Cerbo GX paired with smart shunt, and I see nothing below 13.5V. Maybe 13.4 if there is a day of no sun. Anybody have any ideas?
Sup stranger?
What is actually reporting the alarm? The Phoenix itself? Is DVCC enabled with the smartshunt identified as the SCS, SVS and STS (if you have temp sensor)? If yes, then the shunt is feeding the Phoenix that voltage.
Cerbo/VRM will only catch readings based on its update frequency, which is no more often than 1 minute. Next time you're onsite, use bluetooth to connect to smartshunt with Victronconnect (not through VRM). Go to trends and select SoC and Voltage. Once you've done that, it will log data for 45 days at a much higher rate (every 1-2 seconds or so?).
Connecting to the shunt via VC and VRM will not enable or view any logged data except for the active session. If you connected to it through VC on a PC via VRM and kept the trends tab open, it should "log" for as long as the VC session is active. This might give you a clue before your next visit.
While you can only access that logged trend data through bluetooth, you will at least get a very accurate log of what's going on once you're back onsite.
I'm pretty confident you'll trace it to your BMS(es) - they are going dormant or doing something weird. Low drain situations can see BMSes go into low power mode where they report a notably lower voltage.
Lastly, if you have the stupid LiTime self-heating batteries that cut discharge briefly when charging is terminated, that's likely your issue. Stupidest batteries on the planet.
The phoenix is reporting the low voltage alarm.
I do not have DVCC enabled as my 'stupid self heating litime batteries' are not listed in the approved list of compatible batteries.
I logged into VRM, hit advanced, and opened up the System Battery Voltage & Current (I believe that's what you meant by VC) but the frequency, even if I pare it down to the last hour, is still about 5 minutes apart on the graph.
I wonder if I can pop these batteries open and run a different BMS. So frustrated with these.
You have Dynamic Cut-off switched on? Its not workíng and produce errors.
