JBD BMS communication to LV6548 via Can/RS485 possible?

[Gurusi]

Hey, I wondered if anyone can confirm if its possible to connect my JBD BMS (JBD-AP21S002) to my LV6548 via can or RS485 to communicate info? I found quiet a few posts looking at the subject and followed a few links as well as a MPP pdf stating communication protocol.

So far ive made a custom rj45 connector and two pin jst plug to my bms. Ive tried PIN 3 RS485N and PIN 5 RS485P in combination with battery type pylon, lib and lic to no avail (fault 61).

On some posts it notes to have a ground connected to pin 8; however my rs485 header has no ground (unless going via the bluetooth dongle header).

I also found this:-

BMS Communication Cables with Solar Inverters & Voltacon Lithium Ion Li-2021 2.4kWh and US2000 Pylontech - Voltacon Solar Blog

Table 1 , contains the pin layout for the most used solar off grid inverters. The Battery port RS485 (RJ45 port) is located on the lithium ion battery Li-2021. Only 2 pin are required for the BMS communication protocol PinNumber Battery RS485 BatteryCAN DEYE Victron Voltronic GOODWE Growatt 1 […]

voltaconsolar.com

But the combos are endless!

I also found this paid option:-

Hardware interface - now for sale · Uksa007 esphome-jk-bms-can · Discussion #16

Hi, This has all the hardware needed to communicate with BMS and Inverter over CAN bus. Hand built on a PCB and soldered to the ESP32, bulletproof design for production use. Don't use modules and D...

github.com

but if i can avoid the purchase with a simple cable that would be great!

 

[sunshine_eggo]

JK BMS CAN bus comms now possible for inverters that support Goodwe and Pylontech batteries

After much searching I found the JK BMS, with it's 2A built-in active balancer it was just what I was looking for. I wanted to connect my JK-BMS to my inverter like a commercial battery to ensure the inverter knows what the battery is up to in terms of Charging, Discharging, Alarms etc. If you...

diysolarforum.com

 

[Gurusi]

JK BMS CAN bus comms now possible for inverters that support Goodwe and Pylontech batteries

After much searching I found the JK BMS, with it's 2A built-in active balancer it was just what I was looking for. I wanted to connect my JK-BMS to my inverter like a commercial battery to ensure the inverter knows what the battery is up to in terms of Charging, Discharging, Alarms etc. If you...

diysolarforum.com

Thanks yes, that is the $140 option linked in my orig post. Do you know if this the only workable option? Or will a custom cable work as well?

 

[sunshine_eggo]

Thanks yes, that is the $140 option linked in my orig post. Do you know if this the only workable option? Or will a custom cable work as well?

I have no idea. Just providing info for background purposes.

 

[Gurusi]

I have no idea. Just providing info for background purposes.

Thanks, at least I know there is an option (even if it’s a little costly)

 

[Wessss77]

Unfortunately for me I have to replace 10 of the jbd's with the jk's for this reason...I'm just considering it a serious upgrade at this price point but it will give me peace of mind and the communication and active balance is true value add.

 

[Gurusi]

Unfortunately for me I have to replace 10 of the jbd's with the jk's for this reason...I'm just considering it a serious upgrade at this price point but it will give me peace of mind and the communication and active balance is true value add.

I ended up holding off. I built my own esp32 unit that allows Bluetooth through to home assistant (allowing monitoring away from home). But no options for control or direct communication.

There was a jBD option that was open source, but it closed down for the Peter Board (see off grid garage utube channel). There are paid jBD and jk options, but I couldn’t bring myself to pay that kind of cash when i know the board costs $2-3 (not to undervalue the coding element of course).

So for now I’m good with the basic bulk/float system. I’m sure future BMS’s will integrate something like the Peter Board system and will likely be more cost effective all in one…