Hello Victron community,
I am using BMS mode (hopefully only until another set of CAN terminators arrive) and charging doesn't stop at 100%.
First, I set everything according to the manufacturer's documentation; as meaningfully as possible. I.e. "Bulk Voltage" is nowhere to be found in the Multi RS. It's mentioned in Multi RS documentation as a description of charge mode, in description of built-in BMS, but I don't see anything about setting it.
I may have confused the BMS management by initially entering 9600 Ah (which is KWh) instead of 200 Ah. Of course I closely monitored charging and stopped it by turning off solar switch, when it did not stop upon reaching 100% SOC on the battery (higher SOC on the two batteries, to be exact). The SOC indicator in VC was evidently off by a big margin. This was just a brief state, since the batteries were nearly full, when I turned Multi RS on.
I found the mistake and set 200 Ah, but it did not change anything. I consulted documentation and used Settings -> Battery -> Expert Mode -> "Sychnronize" button for "Synchronize SOC to 100%" (when 2nd battery charged to 100%) and after that the SOC on VC perfectly matched what the battery shows (in range circa 68-100%, that I could test Today).
However, the charging still didn't stop at 100%. I didn't try to let it charge beyond 100%, so I'm not sure if "synchronizing" to lower value would help, or if it is because I missed some setting, or if I misunderstood the manual about built-in BMS capabilities with LiFePo4 batteries.
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Bellow are VC settings I am using and Manufacturer's recommended settings.
Battery charging range:
It doesn't seem to be accurate for two parallel batteries, though.
Voltages:
- Bulk = 54.0 V
- Absorbtion = 53.4 V
- Float = 51.7 V
This is recommended specifically for Victron Energy invertors:
• DC input low shut down: 37,5V
• DC input low restart: 46,5V
• DC input low pre-alarm: 43,5V
• Shutdown Voltage:
--> 0.005C 47,4V
--> 0.25C 48,2V
--> 0.7C 48,3V
• Sustain Voltage: 38,0V
However, those such (exact) settings aren't present in Victron Connect, I think. And they seem to be all related to the low state of charge.
