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CAN and RS485 BMS Interface with multiple emulated Inverter protocols for JkBms Jbd BMS Daly 123Smart

Paulfrench35 said:
Thank you very much. Merry Christmas. I would like to support it but it doesn't work.

Communication between the bms and the ESP32 does not work, no information in the app. In Serial Protocol I have chosen JKBMS.

View attachment 184831View attachment 184832
Click to expand...
Is a paypall link

In ur case put bt protocol OFF - if use bt protocl serial protocols and rs485 protocol will turn off.
Put Serial protocol OFF and RS485 on if u connect on Serial 2

Ur setup:
Can Interface: BT CAN
RE485 Protocol: JKBms
Can Protocol: Growatt / Pylon / Semplos
 
Last edited:
Paulfrench35 said:
I used this diagram ...

View attachment 185666

There is a big problem in your software, for it to work I have to use RS485 port ????

View attachment 185667

View attachment 185668
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I i explained before on JkBms GPS port is UART TTL signal at 115200 kbps

If connect direct RX TX GND to Serial 1 or serial 2 of esp32 will work.
In my schematics Serial 2 is connected to RS485 adaptor that why in software is named RS485

Hardware Connection:

IkBMS UART TTL <-> JkBMS RS485 adaptor< -> MAX 485 < -> ESP32 UART TTL

is same with

JKBMS UART TTL <-> ESP32 UART TTL

when u use serial direct u have RX TX GND line

when use rs485 adaptor u have only A B line

The problem with gnd connection is when u have 2 jkbms on same interface , if one of ur interface will block charge discharge will cut gnd connection, but gnd will be same on serial connection .
 
besher said:
hi @mrconstantin
Is it possible to work with Voltronic inverter?
Click to expand...
voltronic dont support can port, maybe they work on rs485 i dont know.

All invertors migrate to can bms support, on mpp solar / easun / other chinaese copy they start to have can support after last update

MPP Solar Inc » PIP-MAX SERIES

www.mppsolar.com www.mppsolar.com

i have rs485 from seplos and pylon protocol is same but i dont tested.
 
This is the next generation interface DIY B4I

1 - Serial port used for extender
2 - Rs485 ports
2 - Can ports
1 - Digital output for contactor.

Hv Protocols will be on this setup.

20240112_210204.jpg
 
Sven77PV said:
[...], but with esp32-can-iot I found, that my Balancers (JK-DZ08B2A24S-CAN) are communicating at 500Kbps, while MrConstantin uses them at 250Kbps.
Click to expand...
Just to report my mistake:
I obviously ran into a known issue, where the internal SJA1000 of ESP32 is running at half speed only.
So I only "thought" to be able to communicate at 500Kbps, but now I verified with a Logic Analyzer, that it is running at 250Kbps with the 500Kbps setting!

Still, I wonder why my inverter sends some messages at that speed - but will investigate this later...
 
Would this work to get a Topband BMS to talk to Growatt SPA3000? If so would definitely pick up a kit!

I have a spare ESP32 here but it's one of the M5Stack canbus kits. I've got it to flash, might try to see if works with batt, could I have an app key?

ID: 9ddad4d4​

 
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