Eltek Flatpack2 48V - Power LED blinking

[Kta22]

Hello everyone,


I have implemented an ESP32-based controller for the Eltek Flatpack2 with Home Assistant integration(GitHub - taHC81/Eltek-Flatpack2-ESPhome: Monitor and configure Eltek Flaptak2 PSU using ESPhome). The setup has been working well for voltage and current control. However, after connecting a 2kWh Li-Ion battery (~41V), the PSU functioned correctly for a few minutes before shutting down. The cooling fan stopped, and only the power LED (green) is flashing.


Currently, the unit is not providing any output voltage, and the CAN bus communication is sending only zeros. Could this indicate that the unit has entered a protection mode? If so, how can it be reset? Has anyone encountered a similar issue?


Any insights would be greatly appreciated.

 

[dominik h]

I have seen the undervoltage cut off on different versions of the Eltek Rectifiers , but as I remember it was cutting off under 35V.
I reseted mine with unplugging the power line.
My test where done with two flatpaks connected in series to charge a 21S Li-NMC battery.
Charging always worked without issues when the battery was above a little above 70V.