Will a USB connection via FTDI USB RS485 adapter to JK BMS work with this project?

Hello, I am not sure if this would work but thought I would ask if a setup using a RS485 to USB adapter as shown here, would work with jblance/mppsolar?

On the old jbalance/jkbms project page it says, “Python library to talk to a JK-B1A24S or B2A24S battery monitor via bluetooth (BLE).” Which says it was only via Bluetooth Low Energy.

In usage.md it says in the JKBMS Usage section,: -p PORT, --port PORT Specifies the device communications port (/dev/ttyUSB0 [default], /dev/hidraw0, test, ...) which would lead one to believe that it is possible as USB ports are given as examples.

In the README.md it says in the Protocol / Command References section : JK-B1A24S-RS485-protocol-english.pdf | JKBMS RS485 protocol (un-implemented) which makes me unsure if it is supported.

So, before I go and buy a FTDI USB RS485 adapter for this can you tell me if this would work or not? Thanks for your time and help! Frederick

[frederickjh]

@preussal I saw somewhere someone complaining that the JK BMS RS485 adapters were flaky and did not always work well and some times not at all. They switched to a TTL level converter and connected it directly to the RS485 port on the JK BMS.

[preussal]

Hi Meccip,

i used the Script from here https://github.com/PurpleAlien/jk-bms_grafana

But my B2A24S15P BMS is not working. I measured around 2.5 megaohm. With my JK-B2A24S20P I have 60 kilo ohm and I get data with the script

https://github.com/PurpleAlien/jk-bms_grafana/issues/2#issuecomment-1236952947