Below is what I am thinking, could anyone confirm if this sounds right or if there is anything else I can do?
- Ensure the OpenInverter board is in control of the contactors, not BMS or something else.
(If the BMS needs to controll them it can send CAN commands to the OpenInverter board) - Ensure OpenInverter board is in tripmode 1 or 2 (In the event of an error, close the precharge contactor and open the main contactor. This helps protect the LDU as 0-"All Off" will kill it for sure if the error happens while its spinning.)
- For switching 12V power to the OpenInverter board, run two switches in parallel (so both must be turned off to kill the power, so if 1 switch fails somehow, the other still works and the board as 12V)
- For the negative contactor and main contactor, run two contactors for each in parallel (such that if 1 fails/opens, the other will remain closed. My assumption is that when a contactor fails internally then it opens. I hope that is correct.)
- Give each contactor its own fuse (lower than the 5a fuse that is feeding the OpenInverter board, so a failure in a contactor doesnt cause the OpenInverter board to loose pwer)
- Never run a fuse other lower than a 500a pyro fuse (assuming your HV wires are able to handle 500a)
Should we be running 10kw cooking elements in parallel with both the main and negative contactors?
(My assumption is no as that sounds wacky outside of a bench test situation)