/Eltek-Flatpack2-ESPhome

Monitor and configure Eltek Flaptak2 PSU using ESPhome

MIT LicenseMIT

Eltek-Flatpack2-ESPhome

Configure and monitor Eltek Flatpack2 PSU using ESPhome, here used to charge Li-ion battery pack, controlled from Home assistant.

HW prototype

  • WEMOS D1 MINI ESP32
  • SN65HVD230 CAN transceiver

Sources

https://openinverter.org/forum/viewtopic.php?t=1351

Notes

  • note that PSU is reverting to the default voltage with no current limit while the communication is lost
  • CAN bus is wired directly from the PSU, you shall use "professional" board to connect the backplane
  • there's a layer of insluating tape (polyimide, kapton) below the CAN transceiver
  • no need to update serial number within the code, it will be fetched from a CAN messages
  • current limiting is working only above 48V on an output terminals (not just configured voltage)

HW HW

How it should looks like within the Home assistant lovelace

HA lovelace