-
-
Notifications
You must be signed in to change notification settings - Fork 147
New issue
Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.
By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.
Already on GitHub? Sign in to your account
MP keeps charging and discharging at set point MAX_CELL_VOLTAGE #471
Comments
It doesn't say Float, but the problem seems the same. Maybe it is normal to keep the 55,2V |
The device list looks like yours and says absorption. |
Show your settings in the ess settings directly from the multiplus. |
I have Float Set to 56.8V, Absorbtion to 57.8v, but stop charging using the serialBattery-settings at 55.2V, like as you did directly on the MPII. |
Ok thank you. |
I would also like to follow up on this topic, I think I have a similar issue. Now what happens is that it charged to 100% SoC (after the above mentioned 2 weeks of being betw. 10-50%) but the cell voltages are still so low that it keeps charging with 60A for 1-2 hours. I think it could be okay but the issue is that when one cell hits the limit (e.g. 3.45 V) the first current limit applies 60A-30A. The problem of this topic here sounds very similar. Anyone with a suggestion on it? |
Yes, @morres83 I also have deactivated charging based on SOC. But my "problem" is different. Only the inverter changes pretty quick between charging and discharging but keeps 55.2V Are your Cells balanced? Sound like they are not. |
Yes my cells are balanced so this shouldn't be the problem. For me it seems that when the current drops, also the voltage drops. Maybe I have to wait a longer time until it settles, but today it wasn't possible because the sun was gone. For reaching your 55.2V, did you charge a long time when it was showing already 100%? |
It didn't take a long time. What I noticed is that serial battery takes the MPII Voltage to limit and not the BMS Voltage. I have selected the BMS as battery monitor! |
... But this Driver can throttle the charging amps linear to cell voltage. So the should never be this on/off All the time, it should narrow the soc to 100% slower and slower. |
@morres83 You can only see if they differ when there is no/low current. @pos-ei-don that's why I opened this thread. Do you have any idea which settings could cause this? Or maybe I should try Venus OS 2.9 instead of 3.00-18!? |
Hello @pos-ei-don , yes now when you are saying this, normally it should be linear. But I am very sure that there was never a linear interpolated value. The parameter either showed 60A or 30A (so current at 3.3V point or current at 3.45V point) and nothing in between. So I was digging around and I found that LINEAR_LIMITATION_ENABLE in involved here. I will try with this option turned on to get rid of the jumps. What is CVCM_ENABLE, I am not sure about this one... |
Sorry, nö. Unfortunately it seems that I mixed it up with an fork I once tried. So sorry, I cant help currently |
charging/discharging when the battery is full is normal. the driver does not go into float mode under linear. test the version 0.14 . This works for me, I think 0.14.3 has an error in this regard. see here: #421 |
Is solved with the next version. |
Hello,
my Multiplus II keeps changing between charging and discharging at MAX_CELL_VOLTAGE = 3.45 (55.2)
Every 10 sec or so.
Is this a normal behavior, or did I miss any settings?
Versions:
0.14.3
Venus 3.00-15
Thank you!
VenusOS (please complete the following information):
Device type: Raspberry Pi 3b+
Firmware Version: 3.00-15
Battery/BMS (please complete the following information):
BMS/Battery type:
JK BMS, LifePo4 Battery
Cells: 16
Interface: RS485
The text was updated successfully, but these errors were encountered: