Kbits S

[Dot Liljenquist]

Weare installing lithium batteries with their own BMS working at 250 kbits/s using EasySolar-II GX and Multiplus-II GX units. It seems the Multiplus-II GX units do not have the 250 kbit/s baud rate option, as do all the other GX units.

Is there a way to get the Multiplus-II-GX to work at 250 kbit/s? Changing firmware perhaps?

The batteries have been tested with a Color Control GX and work fine. But it is not working with the Multiplus-II GX.

"14. The CAN-Bus port of the Maxi GX, MultiPlus-II GX and EasySolar-II GX is a BMS-Can port. It can only be used to connect to managed batteries such as Freedomwon, BYD, Pylontech, BlueNova, MG Energy Systems and others, at 500kbps. Note that some early production batches had a labelling mistake: the port was labelled VE.Can. Which -unfortunately- is wrong. The hardware does not meet the requirements for a VE.Can port; and therefor is BMS-Can only."

Hi Matthias,

Thanks for the information, found that as well. But now it is too late for hardware changes from my side.

When I bought these units it was sold to me as a VE.can port... See below the screenshot of the datasheet we included in our bid offer. This was for a large public tender, so it is becoming a critical issue now and we do not have budget to exchange 450 units and add Cerbos to all of them.

Is it not something that can be solved by software?

I don't understand how the communication speed can be a hardware limitation? I am no expert in communication, so if you can explain it to me it would be much appreciated.

Thanks for response. As also ask in this thread,wkirby indicted " VE.Can port is galvanically isolated and the BMS Can or Second Can port is not galvanically isolated. " Could you help me clarify some term:

3. Where are the BMS-Can ports on the MultiPlus-II GX ? ( I only see VE.bus port but yet from the table at [1].(14) it indicates that the MultiPlus-II GX has BMS-Can port and the Can-bus port is NON-Isolated where as the VE.bus port are Isolated )

hi recently try to install the luci-app-qos and sqm-qos for the ax 1800 flint with not success, there are some missed packages in the fw compilation, try to downgrade to severeal different versions and only work in 4.2.0 fw.

i can give it a try but right now i am doing some bufferbloat test in fw 4.2.0 with a gigabit connection, using sqm-qos package with a gigabit connection and wan port rule of 200000 kbits/s down/up i Obtain a solid A+ bufferbloat, but when i Push i my conection in order to obtain the max speed of gigabit connection for example 900000 kbits/s the connection are very unstable and suffer much bufferbloat, for other side i see a lot of cpu utilization in 900000 kbits/s, i think that in 3.x firnware that issue are not present

gl inet sqm1051474 16.5 KB

this is my bufferbloat test with 200.000kbits/s test

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