Will give a try later. I'd like to go low with default voltage, to not harm anything when the connection is lost But can't use Arduino, as I've got ESP32 and SN65HVD230 instead of MCP2515.

SN must be correct, otherwise I can't change CC/CV settings, right? And I've used SN from broadcast message.

BTW, anyone interested in Home Assistant /ESPhome control of Flatpack2, here's the code - https://github.com/taHC81/Eltek-Flatpack2-ESPhome

The datasheet is for at EV Powercharger and not the Flatpack 2 HE. I have not heard of any locked configuration for the Flatpack.

What message are you sending and at what frequency?


0x05004804 followed by 0x05019C00 after 100ms. Also tried 0x05009C00, with no success. Sending 0x05004804 is ...

Sorry, totaly missed your post. :(

You need to send at least 0x05FF4004 (or 05) repeatedly after login is complete.
In my case I send login message (0x05004804) with serial number followed by 0x05FF4004 with desired data every 1 second.

To set default voltage I send login followed by 0x05019C00 ...