Hi
Our MultiPlus 12/3000/120-16 will shutdown at 13.10V. Same time low battery warning will come up. This happened regardless of power usage at that time.
Configuration value for shutdown is 11.50V and restart value is 13.10V. Pre-alarm value is 11.65V.
What is wrong?
Hi Joomies, how much Amps is the Quattro sucking from the battery when the incident happens ? It can be several things : the cable is too thin, so when the VDC is measured at the entry of the Quattro, it has lost too much Volts in order to be usable. Or, the battery is unable to provide the needed Amps during the time needed, either because it is discharged/sulfated, undersized, or damaged. Details of your battery are needed in order to understand better what is happening.
Michel
Thank you Michel.
We have 400Ah lifepo4 battery. 70mm² cable from battery to busbar and 2 X 50mm² from there to MultiPlus.
Shutdown happens no matter how much amps is drawn from battery. This has happened on 100A draw and 3A as well.
If battery voltage is under 13.10V, MultiPlus will show low battery warning and won't start at all.
Have you connected the Aux battery sense?
It sounds like you have a high resistance joint on the main battery cable under load.
Have you measured the voltage on the input terminals?
Having a similar problem. System is CCGX, Multi-II 48/5000, BMV-712, two strings of four 200Ah Gel batteries (6 m old). ESS Mode, "keep batteries charged". CCGX relay is used to start the generator and at night, the thresholds are 60% SOC or 45V for 5 sec. The Multi-Inverter is set for DC input low shut-down 40V, DC input low restart 46V, pre-alarm 44V. SOC low shutdown 50%, restart 70%.
At 3:30 AM the voltage fell to around 46V (as per the alarm sent to the CCGX), and the inverter shut down with a low battery light. Then maybe 30 sec later as the voltage rose again it restarted. And a short time later shut down again, cycling until I started the generator manually. The CCGX didn't start the generator of course because its threshold wasn't reached.
Is this a bug? Why would the Multi shut down so much above the threshold? Is it calculating some other threshold for some reason? Behavior was the same with the default low shut-down of 37.2V.
When using ESS, the voltage thresholds are those set in the ESS assistant.
The voltage thresholds from VE Configure 3 Inverter tab (the ones you listed) are ignored.
Thank you very much! However I don't see anywhere to make those settings neither in CCGX, nor in VE Configure 3 - help please!
Who configured ESS assistant? It wasn't you?
If someone else, before doing anything, read the ESS manual and also save your current configuration.
Check the current ESS assistant settings by clicking the "Summary" button.
To modify the ESS assistant, you can either delete it and set it up again, or press "Start assistant" and you will go through each setting.
Thank you @Seb71 that was very helpful, "Start Assistant" did not imply "Edit" to me. I have altered voltage settings and hopefully won't be awakened at 3:30 again tonight :)
Out of curiosity, what voltages you had in ESS settings and what voltages you changed to?
I was with: and I went to:
.005C cutoff 48 .005C cutoff 46
.25C cutoff 46.6 .25C cutoff 44
.7C cutoff 45.6 .7C cutoff 42
2C cutoff 44.8 2C cutoff 42
What would you recommend for Gel batteries?
Maybe start with slightly higher values and only lower them if all is OK after observing your system for a few days at least.
You said you use ESS and you have a generator. But no grid? ESS should be used when you have the system connected to grid, not with a generator.
Also, I don't understand why you use the "Keep batteries charged" mode.
So it's not a "normal" system. When my old inverter died all I could get at short notice was a Multi although I needed a Quattro. So an engineering firm put together an automatic transfer switch for me. The Multi gets grid power when available (about 50% of the time) and otherwise it's fed by the generator (if running). The CCGX starts the generator based on SOC or battery voltage, but otherwise neither the Multi nor the CCGX can tell whether it's on grid or generator.
I use "keep batteries charged" to have maximum reserve when the grid is off and thereby reduce generator use.
In this context, is ESS inappropriate? My thought was, as far as the system is concerned, it's grid-fed ...
I don't have experience with generators, but supposedly it is not good if the inverter tries to feed in into the "grid" and that "grid" is actually a generator.
Maybe increase the "Grid setpoint" in ESS to prevent that at all times. But as I said, I have no experience with generators.
