Delete the chinese spyware app and try "overkill solar" app, there were some calibration offsets available there afaik, maybe those help

Seems to be working

https://openinverter.org/forum/viewtopic.php?p=44002#p44002

Sounds like you're running into this


Below 48V I am controlling current by setting the voltage setpoint a hair above pack and controlling current that way with a PI loop, had to play around with numbers, but now works super reliably ...

Thought I should post an update:
I had stupidly routed the int for MCP2515 through gpio expander, so had to jump them directly to esp32 pins.
Works pretty good so far, pulling up to 6.1kW from 3x 2kW flatpacks in series. Has some logic from my VX1 BMS messages, and some work towards reading msgs ...

imo for a proper charger handling some more logic should be added, i.e. target cell voltage (some people want to charge to 3.95, some to 4.15), chemistry type, some way to monitor abnormal temp rise, actual CC/CV curves depending on chemistry. For my flatpack charger I am handling this all inside of ...

at this point it is hard to tell as my fork has deviated in some ways, most notably it runs 250k baud, but doing a sanity check for RUN mode imo is worth saving time chasing issues before other comms are initiated. On hw 23 it worked without issues even if sending extra can comms as soon as the ...

if adding a new module/functionality to the openinverter bms to send other CAN comms, please do a check for RUN mode or add arbitrary delay (i.e. 5 seconds) before sending messages, as on older hw versions (below 2.3) there was an issue in my VX1 fork last slave init - last board would not ...

Johu- would you be interested in continuing this design in a direction which branches off from the one set out originally, most importantly - "no big balancing resistors"?

I envision basically the same design, but extra cell tap and i2c headers for a sub board made out of single sided aluminum core ...

Just came across this guy on fb, thought maybe worth a share ( https://www.facebook.com/profile.php?id=61561233521299 ):

Now with the aforementioned mods delta seems to be falling a few mV every day, with most noticeable movement from the outliers, given the "adaptive balancing cycles" I added to my fork. The 16mV delta is now 9mV at the same cell voltage.

I have a nice hall sensor I want to test the balancing on a bench with, will see. I am discharging the battery slowly and today the delta has moved from 16 to 13mV, not sure if because of SoC steepness reduction on the voltage curve or because of balancing. Will give it some more time and do a full ...

So I removed PTCs in front of cell taps, paralleled another F1 on top of outp ptc fuse and paralleled 2 balancing fet resistors (now 5R each), if my understanding of current flow is correct- I should now see about double of balancing current. In 48h module with cell delta of 16mV is still at 16mV at ...

I remember reading a patent long time ago about some other manufacturer having "breathing" tabs for their cells and went looking if LG has something similar. Often researching similarly rabbithole subjects online I end up getting results from here, so I'll just disclose to take the below findings ...

The modules themselves had no smell, maybe could feel something if sticking the nose really on the cell tap connector. I first noticed it when I opened one to change the fuses. Inside of the battery had the distinct lipo smell I have found in sealed battery boxes and in a super strong flavor when ...

What I have noticed that I have a very faint smell of electrolyte coming from my battery box, which is not completely sealed, but have some cable holes in it. I can feel the faint smell when I put my nose right next to the holes or seams.

I know this very particular smell because I have punctured ...

You need to set param balance to both and ubal below what the cell voltage is, say 3800mV and the balancing is only carries out in state idle, which is switched to once the current from current sensor is below some treshold. Johu afaik made new params for idle state current in latest commits, if ...

Mine are constantly power cycled, 2.3 with capacitor mod. No death or issues so far, but also seems to do nothing in terms of balancing. A week later the overall numbers get lower from 7mA drain from motor controller dcdc, but the delta, if closing, seems to be only on soc curve, not balancing ...

Just this morning my sleep deprived brain was wondering about this by trying to visualize the current flow.

First need to get rid of PTCs in front of my cell taps, as most likely they shoot up in resistance at summer temps just above 100mA.

Given the low duty cycle imo targeting a few hundred mA ...

So I thought more about my lack of balancing progress and hopefully came up with a better way to approach balancing:
Instead of fixed balancing cycles using adaptive and agressive balancing time increases with up to ~10s per cell if delta deviates say above 15mV and scale up as needed.

PARAM ...

What you are looking for is EPTFE, same as goretex - allows the box to breathe. ePTFE membranes in the 0.2-0.3 µm range are generally excellent for blocking moisture while still allowing air to pass through. Look on aliexpress, they come both in sticker or gland format.

I am thinking more of larger storage systems, 1MW solar park with some, say LTO/LFP, ESS probably outsells all currently sold BMSes. There's plethora of 48V pretty nice BMSes out there, but not too many options when you want to have say 600V LTO pack.

Probably need to take a list of currently ...

My full-ish discharges and integrated amp hours from bike MC against meb soc curve puts them around 148-155Ah depending on what phase the moon is at, so probably it is just a matter of capacity in question. Getting rid of 300mV delta took 2+ weeks when discharging all pack @50ish W and charging the ...

Just checking in - so far the system has been working as intended, however I am contemplating maybe removing the series fuses to increase the balancing current flow. Now the battery sits at 30ish mV delta with maybe half a millivolt improvement a day, not improving much overall. My batteries come ...

Given that there's already first replication effort from UK and to aide any future efforts to replicate I thought I should do a small writeup of current gotchas:
1) You need to use VScode + Platformio for ESP32 flashing, any CAN transceiver and redefined TWAI CAN pins will work. Make sure to get ...

Johu, IMO it is worth it to add params for sleep time and idle current, both came in very useful in my vx1 fork and I guess others may find them useful as well