AOLithium (48V) Buyer Feedback

[Detritalgeo]

Made a quick recording of the changes in the lates version received last week. Some hardware changes and definitely a new BMS firmware/hardware..

Will try make a more cleaned up summary later on.

 

[Detritalgeo]

If even one person has gotten their hands on the software they could post it on a Drive / GitHub and share it with the rest of us.

This video shows the similarity with the BMS used by CERRNSS,... including the monitoring software.

 

[edharveybc]

I'd wonder if it's possible to purchase the old (or new) BMS and do a swap...

Some more info in this thread on the KS48100 BMS

R

Thread 'BEMORY BMS KS48100?'

Jul 25, 2024

Hello all,

I purchased a battery from the BEMORY store on Aliexpress. Unfortunately, it appears to have B-grade cells, as all the QR codes are scratched off. Additionally, the battery has a strange BMS that I can't connect to. I've tried several different software and cables, but I haven't been able to establish a connection with either a PC or an Android device since it has Bluetooth.

I was considering connecting this battery in parallel with two others, but it seems it only allows for passthrough, as the other batteries connect without any issues.

Photo of the RJ45 ports:
...

• Rafael44p
• Replies: 14
• Forum: BMS (Battery Managment Systems)

 

[Detritalgeo]

just cant see the Dry Contacts in that one... or cant be sure

 

[edharveybc]

just cant see the Dry Contacts in that one... or cant be sure

Might be an older version, it did say KS48100 on the PCB. They also could have hidden them behind the chassis.

 

[Dmac432]

Hey, can anyone help me figure out the new aolithium rs485 pin out... trying to make the new batteries work with a 6500ex....

is the battery and

is the inverter side...
would pin 3 from the inverter got to 1 and 8 on the battery side?
and pin 5 to 2 and 7?

 

[Detritalgeo]

Yeah likely pin 3 on inverter to pin 1 on battery and pin 5 on inverter to pin 2 on battery..

For the dip switches ignore the master pack configuration and set the first one up as slave 1 (first dip on and rest off) then the next packs are set as slave 2, 3 and so on.

 

[Solar Moose]

Has anyone made a cable to their laptop Ethernet port, from the AoLithium packs?
I have a spare laptop and cables, and don’t see the need for the USB adapter types.
Or am I missing something?

 

[Detritalgeo]

The PC monitoring software (that only works with the blue DIP switch model) needs a Serial connection at 9600 Baud... I am not sure if it's possible to use the Ethernet port as a virtual serial COM port...

so I just use the RS485 USB adapter to convert the data from the battery to a virtual serial port on the PC.

 

[Detritalgeo]

Not off to a great start with these V3's... maybe they went for cheaper components this time..

Now to let passive balancing work away..

I did notice there is a 'Cell Equalization' section in the menu now though, will grab a photo of that next.

 

[Solar Moose]

The equalization screen says yes or no, of the cells that are over 3500mV providing the passive current.

I want this to start at 3450mV or 3400mV, but we don’t have the ability to change this.

 

[Detritalgeo]

Yeah,... Not until we find a way to access the monitoring application.

I am trying to let it balance but it keeps going to alarm at 56V... Very odd since the manual says charge Voltage is 57.8V (which is a bit high for my liking)

Will have to find the best way to getbthe top balance done.. My 2 original packs were rarely a few mV different but this first V3 is over 100 mV right now.

 

[Solar Moose]

I used a 60V 5A charger to run one pack for three days, to balance it.

The rest were close, but closer would require more of my time.

I think the alarm at 56V is not applying to the manual either. But the 60V power supply ramping up slowly will keep it alive.

 

[Detritalgeo]

Ok, I just use a RD6024 adjustable power supply (up to 60V - 24A)..

An it at 56V and 14A, I guess ithat was too steep and maybe it flagged a cell over-volt at around the 56V mark. Was odd since there was no active alarm, protection or fault indicators in the menu. There were 56 overtemp instances and 100 discharge overcurrent though..

Definitely feels like these most recent units have a less robust BMS.

I will try 56V and 0.5A and see what happens...

 

[airChris]

I discovered that Bemory and CERRNSS use what looks to be the same BMS as the Mark-2 version of the AOlithium pack. I was also able to get the BMS datasheet from AOlithium for the Mark-2 BMS. It is maid be Shenzhen Kesheng. The software for the other batteries can be obtained and the interface is the same as the one shown in the datasheet.

So between the software, the datasheet and the owners manual of the other packs it can be figured out.

Here is the datasheet...

I ran the datasheet through Google Translate, and converted it to "english." File attached.

Chris

 

[Kremer]

68ma balance current, yep that sounds about right... So sloowwwww.

 

[Detritalgeo]

I have a new pack with 100 mV to balance out... update you next month

I also noticed that this one consumes almost double (50 mA vs. 30 mA) when the LCD is on... with the new packs the LCD stays on indefinitely. It is an entirely different BMS but assuming the self-consumption rates are similar that suggests a reduction in standby time from 140 to 83 days... or an increase in daily 24hself consumption from 3Ah to 5Ah.... I sure hope they can figure out a way to provide us a firmware update...

 

[Dmac432]

I emailed the company I bought the inverter from and this is what they sent me back
I wasn't able to get the V3 to talk to the inverter using this, maybe someone will have better luck (mapleleaf 6500)

Hello, As per the inverter manufacturer, these are their instructions: A. Use the battery RS485A port B. Refer to below RS485 pinout definition, you need to use the BMS cable as below pinouts to connect the inverter to the battery. C. Then refer to the battery manual to set the battery RS485 BMS parameter. D. The last setting is to set the battery type on inverter LCD display to Lib. — \ thank-you-for-contacting-solar-power-store-canada-brand

 

[Kremer]

I have a new pack with 100 mV to balance out... update you next month

I just bought three NEEY 4A active balancers (with bluetooth) to install on my packs. Will update.

 

[Detritalgeo]

I just bought three NEEY 4A active balancers (with bluetooth) to install on my packs. Will update.

I paused my balancing project for now but will keep going when I return from a trip. First pack was over 100 mV out at the 'upper knee' then joined 2 other new packs in parallel and those were 30-40 mV.

The packs kept going into alarm which I think was due to 56V being an over-volt setting? That or one of the 2 runner cells spiked past 3.6V..

So I had to turn the power supply down to 55.85V which seemed to read as 55.98V on the LCD displays. I set the power supply to 0.6-0.7A per pack or 2A for the set of 3 in parallel. After 24h all 3 were down to 20mV delta.. Balancing is set to start at 3.5V on my packs and can't change that (yet).

When I return I will see how long it takes to get delta down to 4-5mV.. If it happens.

 

[Solar Moose]

I paused my balancing project for now but will keep going when I return from a trip. First pack was over 100 mV out at the 'upper knee' then joined 2 other new packs in parallel and those were 30-40 mV.

The packs kept going into alarm which I think was due to 56V being an over-volt setting? That or one of the 2 runner cells spiked past 3.6V..

So I had to turn the power supply down to 55.85V which seemed to read as 55.98V on the LCD displays. I set the power supply to 0.6-0.7A per pack or 2A for the set of 3 in parallel. After 24h all 3 were down to 20mV delta.. Balancing is set to start at 3.5V on my packs and can't change that (yet).

When I return I will see how long it takes to get delta down to 4-5mV.. If it happens.

My V3’s will shut off balancing at 20mV, if I’m not mistaken.
Also, I was able to get the voltage up to, 56.8V if I use a power supply and go up by 50mV every 10min or so…..such a goat-rope show!

 

[Kremer]

To go beyond 55.99 (per the display) you need to be under .5A. any more will shut off charging and reset to 100%. I found a hard limit at 57.00V indicated.

 

[Solar Moose]

I wrote an email yesterday to the support@aolithium.com

I’m writing to inform you that the 51.2V 100AH Server rack battery does not perform to the parameters stated in your manual.
Namely;
1) Impossible to charge up to 57.6V as stated in manual, BMS stops charging at 56V.
2) The cutoff of charging at 56.0V means that no cells get to equalize voltage, in normal operations, and during initial balancing takes many days.
3) The balancing should start at 3450mV.

 

[Solar Moose]

I also found a small note in their manual to charge to 56.8V, and I did get there briefly today, to let them balance.
I didn’t realize that going above .5A when above 55.99V was the trigger! Thanks Kremer!
My latest trick is to leave them all connected after fully charged to 55.9V then connect my power supply to bring them up.
I think that works as no unit sees more than .5A.
I do this with inverter charger off and no solar production.

 

[Detritalgeo]

That is part of why I am a little pissed they switched BMS's again... for the Blue DIPs I have I finally found the monitoring software and can modify the balance start voltage myself. Not these ones though... yet

I have sent a message every second day since December 24th to support about the issues with the V3 BMS and its been crickets.

The last response I have gotten mid December to a question about if they were going to be re-stocking soon... and they basically said "how should I know if the managers will decide to send more stock" lol