MG1 and MG2 inverter temp ranges/maximums?

This has got me a little confused:

• MG1/MG2 - pair of temperatures
• Ti1/Ti2 - pair of inverter temperatures (?)

As a general rule, we know temperatures should be ICE < MG1 < MG2. As for inverter temperatures, the one time I looked, I did not see a pattern or evident limits. Personally, I think 100C is a good upper limit but that is just Some Wild nice person Guess (SWAG). The inverter coolant should be able to go hotter than 100C but I don't know how much hotter.

Good luck!
Bob Wilson

 

Any update on this? I'm kind of curious as well.. I took a long 100km drive this weekend in my new C2 in about -8C temperatures with the front intake completely blocked and had my ScanGaugeII looking at the various temps and both MGs were below 65C throughout the trip, so I was not concerned about the transaxle, but as the engine coolant temperature approached 92C with the intake blocked, the inverter 1 temp started getting what I considered quite high: hit 51C and maxed out at 57C, although it would drop instantly to mid-40s as soon as I let off the accelerator. Rather than get out and pull the foam, I cranked the cabin heat and fan speed up (and had to open the windows- when the engine has heat to spare, the tiny cabin heats up really quickly) to dump engine heat, and I'm assuming because the radiators are physically connected, this resulted in a reduction of inverter coolant temperatures as well, as the inverter temps went down along with engine coolant temp.. What's the max safe temperature for the inverters? Normally, we want to keep temperatures below 50C as failure rates go way up, but automotive electronics are a different story altogether, but if the above graphs actually show inverter temps vs. MG temps, even with the extended temperature ranges in automotive applications, close to 100C in the inverter is kind of scary..

 

I'm not sure why that happened. I think in 2nd gen and later, the radiators are combined, but in our Gen 1 the inverter radiator is a separate little stubby one out in front of the main one. (The main one does combine the engine radiator and the A/C condenser.)

-Chap