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

Making a whole new MC is also doable, but much more labor intensive imo. RP2040 for encoder would probably be a bit more sketchy than using ice40 (at least it is an excuse to finally play with it), price wise makes no big difference, however, I would like total bom to be <35€, which is 1/10 of what ...

A new MC or dremeling automotive inverter to fit is a pretty gargantuan task imo.

How about these much simpler tasks:

1) Magnetic encoder based on AS5047P + RP2040 PIO to emulate the optical encoder? BOM cost <20€, can delete first link for garbage data given how bad of a reputation there is ...

Yes they will

Just a heads up for anyone building with MEB modules-
The captive nuts on busbars are designed in a way that excessive torque may make it start turning inside of the module.
I mistakenly installed one bolt with pre-applied locktite + had nordlock on it, started spinning inside while trying to undo ...

maiks wrote: ↑Fri Jun 06, 2025 7:26 am Thank you, @johu. I just want to confirm—should I remove the components marked in red (as shown in the attached image) and replace them with 10 nF or 22 nF 0603 SMD ceramic capacitors?

see pic on my "implementation", ther resistors are beneath the caps

You need to connect enable in to the first board, which in turn controls enable in on next board through its enable out. Without these nothing will work.

Thank you, will do, however I don't know when, this month probably. I am now not balancing, just letting the bike sit at idle consuming 250mA @36S and charging 3 weak cells with 100-300mA. Given the gigantic delta and size of MEB module- not sure if it will take days or weeks before I do another ...

I was correcting the values on my end with DCAN_SIGNED, but at some point it was still failing. Without DCAN_SIGNED I would need to correct current and make sure not to touch negative params from web interface.

uuh, that sounds ugly but I don't quite understand what is going wrong? Are cell voltages not stable?


Please see post https://openinverter.org/forum/viewtopic.php?p=83070#p83070
Now 2 slaves are running DCAN_SIGNED=0, master is DCAN_SIGNED=1, need to fix it sometime, but otherwise over 4.1V I ...

so my 36S MEB modules have been in use for <1 week, so far no issues. Balancing is slow, I am helping the weakest cells with PSU CV set below before it starts tripping the hell out of ADC measurements on the adjacent cells and OCP <300mA.
The gate resistor has 8200pF 100V cap across it, extra 3R on ...

So I ended up creating all sorts of voltage corrections, slave umax/umin caching, more extreme tresholds, special cases for outliers and whatnot for handling signed/unsigned value handling for voltages above 4100mV, to still have balancing not commencing properly on slave modules given that every ...

Another interesting thing, I kinda mostly did not touch BMS core functions, but during my first full charge cycle I noticed that Web tool started displaying borked voltages from between the modules.
Below is LLM summary:
Battery voltage values displayed as negative (-4063mV) on BMS nodes due to 13 ...