Well... awful news.MattsAwesomeStuff wrote: ↑Mon Apr 17, 2023 12:38 pmWell crap, so, just powering up the inverter itself... fried.
I've been getting a ton done on my car. Working on mounting the Bosch iBooster and other mechanical things.
It was time to make progress on the driveline again. So I took the day off, helped a friend empty their garage for me to use, packed up lots of my tools and my motor and inverter and two car batteries and battery chargers and basically a whole mobile shop for me to spend the day using the motor as a lathe to machine the other half of my motor coupler and where it connects to the transmission output shaft. My goal by the end of the day was to have the powertrain ready to install into the car and see the tires spin.
...
Wire it all up, connect it up, motor's not spinning.
Check and double check, try again, motor's not spinning.
But the 12v system wires are warm again. Tested the voltage, 8v. Disconnected power to the inverter, jumps back to 12v.
ANOTHER INVERTER FRIED?
Was only pulling 1.6 amps (1.4 is normal), but otherwise same symptoms as the last time my inverter fried.
I don't have any more spare inverters, and they very, very rarely appear at a junkyard (took me 4 years to get the 2 I have).
One fried inverter is coincidence. Two fried inverters means... either the board or me is doing something to fry them. Toyota inverters at that.
Anyone have any ideas what could be causing the inverter to power hog or short internally like this? Or what I could do to find out?
Only thing I can think of that I maybe did wrong, was not use a pre-charge resistor when connecting the "HV" power (12v or 24v today). Doesn't explain to me why the system 12v is shorted.