Taher Sylla

When on update, it should be on battery mode, no solar, no AC, No loads on the inverter, you can use a laptop or put your pc only on the generator, this would work fine I think if your generator doesn't shut unexpectedly 

I will be trying both firmwares, and I will writing notes about every update, Thank you sir

Unfourtunetly the didn't work, non of these, except for "how to activate control board" I didn't have the equipments for that so I can try it, I will be checking if I can get the equipment asap

Yes, you should find this usb converter in the market like bahsa, it is about 35000SP, I think I have another one if you want, I am in Ashrafiyat Sahnaya if you want, you can contact me on whatsapp : 00963983809945

The automation industry has already pretty much adopted can bus as one of their fieldbuses. All midrange and higher  industrial microcontrollers  have can bus as standard these days , as is the case with uarts (RS232/RS485). Can bus has just so many advantages over RS485 in terms of protocol specification , real-time capability, deterministic latency  etc ,  etc .
BUT RS485/RS232 will stay with us for decades to come.  One of the reasons is Modbus RTU , which will never go away. It is the oldest and most  ancient transport protocol in the industry , but integrators just love it to no ends.  The main reason why RS485 will not disappear in the Lithium BMS industry is due to the need for user level configuration tools. All BMS manufacturers entertain a Windows-compatible app in order to change BMS settings , view logs , update firmware etc. Now the reason they dictate RS485 or RS232 for this , is because there exist a comprehensive layer of abstraction for serial UARTS . In short this is a UART-USB dongle  which exposes a subset of USB endpoints in order to create a unified CDC (Communication Device Class)  driver in Windows. The end result is the good old COM1,COM2,COM3 etc serial port enumerations that we grew up with. What this all means is you can grab a cheap CH340 dongle or an higher-end FTDI dongle , add a cheap RS485 driver chip , plug it into Windows and there you have exposed COM1 or COM2 . Now what this means is that the windows software developers of BMS  implements a standard serial port UART API , and it does not get easier.
In contrast , there exist no USB Emulation Class in the industry for can bus . So although  you do get CANBUS-USB dongles they are proprietary and you require a very special Windows driver for it , and you need to expose an API LIBRARY  in order for the third party to integrate the dongle into their application software. Furthermore CANBUS-USB dongles are expensive.
 
EDIT : Linux has a canbus stack called socketcan but it has not been agressively adopted like the CDC class for uarts . 
 
 
 

The automotive industry went through pretty much the same development phase.
The CAN bus technology was the only option ultimately post the numerous modules all feeding the main processing module.
Old K-line data lines sufficed up to the 90s but the ever increasing amounts of data and their buses dictated CAN bus transition for all manufacturers.
The demand on ever more data exchanges between Inverters and Batteries and other computer modules with their software analysis tools will ultimately saturate the RS485 technology.
Until such time the RS485 can still be used to do the basic BMS-Inverter comms. But the industry will eventually standardise with CAN just like the Auto industry did.
 

Felicity solar kinda don't know how to communicate their batteries with Voltronic Inverters, it doesn't work on PYL, but it did work on LIC, I tried it with Axpert VMIII 4Kw Twin and Axpert VM III 3Kw and worked great with no problems

Felicity solar kinda don't know how to communicate their batteries with Voltronic Inverters, it doesn't work on PYL, but it did work on LIC, I tried it with Axpert VMIII 4Kw Twin and Axpert VM III 3Kw and worked great with no problems

Hi! Here is the newest firmware (v60.05) for Axpert VM III-4000 TWIN. Good luck!
VM III_TWIN_60.05.ZIP

I think in the early days there might have been some issues, but these days I don't think it's a problem.

I will be trying both firmwares, and I will writing notes about every update, Thank you sir

VMIII TWIN_Ver_60.04
VMIII TWIN_Ver60.04.7z

I have a few in my collection, but the numbering is confusing. I believe that all these firmwares will work on 4 kW and 6 kW models with no modification.
Examples: 56.11, 60.66, 60.90, 56.97. I suspect that the .9x are different to the others with the same major version number (before the dot). Or they might be "experimental". I don't remember where I collected these from.
What main firmware versions are you seeing?
Firmware upgrade instructions for models with removable display. I'm guessing that these models qualify as removable display.

You need to change in program 10 which is  the charging source from OSO to one of the 2 othere charging source as OSO is solar only 

Contact Solar Assistant and see if they are busy yet with compatibility for Felicity batteries.
They support a huge range of batteries and Inverters already and their software provides the data that you are after.
https://solar-assistant.io/help/general/introduction

[email protected]

 

Ok I will try The VM4 cable and tell you the result, thank you

You quite right, the VM3 has no schematic for BMS pinout. 
But I assure you they both the same, VM3 and VM4 BMS pinouts. If I remember off the cuff its pin 3 and 5 (cannot remember which is A and B but the VM4 schematic will tell you) 
So the VM4 cable you can use on VM3 as is. 
 

@Steve87 paired a felicity solar battery  with a Deye via RS485 Pylontech protocol. This is promising for you as your VM3 also supports the RS485 Pylontech.
But we need to verify wether your battery  functionality matches that of the one Steve used. Do you have a RS485 port on  the battery? . Can you send a picture of the battery and also a closeup of the comm connectors.?