Looking for Docs for StealthEV Charger+DC/DC

1196 Views 4 Replies 3 Participants Last post by Ken S, May 17, 2022

Ken S

Discussion Starter · May 8, 2022

I bought an integrated Charger + DC/DC converter from StealthEV. The vendor describes this as "SEV33ADE-144", "3.3 KW AIR COOLED CHARGER + 1 KW DC/DC CONVERTER"
This is the 144V version; they also market a 108V version. I understand these are likely rebranded Ovartech chargers.

Unfortunately, it's not working. I need to troubleshoot the charger. It is sending no data on the CAN bus. Nothing. I am looking for diagnostic information. Any ideas?

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Ken S

Discussion Starter · #3 · May 11, 2022

Kudos to Frank at Ovartech. He shared key details that helped me diagnose the behavior.

The CAN dataflow does not start when the 12V power is applied or when DC/DC converter is enabled. CAN dataflow begins only after the AC Mains are powered on.

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Ken S

Discussion Starter · #5 · May 17, 2022

CANBus dataflow during charging behaves as expected. The BMS commands the charger to deliver a certain max current and max voltage(1 Hz). The charger announces its actual behavior (also 1Hz). If the charger receives no messages from the BMS for 5 seconds, then the charger reduces the current to zero. Textbook. (i.e.: so far, no smoke)

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