Testing Tesla Model S CHAdeMO Adapter w/ Odd Over-Voltage Discovery – Video
KmanAuto tests out the recently released CHAdeMO adapter for Level III charging of the Tesla Model S at CHAdeMO charging stations. He states:
“Testing the Tesla to CHAdeMO adapter for the first time. IT WORKS CAPTAIN! However, the station itself wouldn’t output it’s max capacity of 20kW (Sad I know, only 20kW DC “FAST” Charger). I only got 12kW. Either way, It works, and it’s a start. I will be testing a more powerful station, and including Thermal Camera footage as well showing any heat build up etc…“
We are happy to see that it works. However, Kman discovered something unexpected at a CHAdeMO station… Take a look for yourself in the video below:
Kman discusses the issue like this:
“Finally got a chance to test a HIGHER power CHAdeMO station tonight…. And…. It scared me…..
When the station kicked in, Voltages being pumped to my car were in excess of 460v. That is WAY THE HECK TOO HIGH! Can you say “HOLY COOKED BATTERIES BATMAN!!!”.
Thats right, lithium doesn’t like having too high of voltage being pumped into it. Even a Supercharger doesn’t go that high of voltage. In comparison, a FULLY CHARGED 60kW Model S pack tops out at 353v FULLY CHARGED. a 85kW Model S pack tops out at 404-405v Fully Charged!!!!
So, with my 60kW pack, the CHAdeMO station tried pumping in over 100v HIGHER then my pack would be fully charged. That, let alone my pack was NOT full, and at a lower voltage (about 340v, and if my pack was near empty, about 290v, Car is shutting down voltage is around 260v)
This is scary. And part of the reason why Tesla took so long to release this adapter. The direct access to the pack via DC is not something to be taken lightly. Now, my pack did survive this onslaught of high voltage, why? Because safety measures kicked in. As soon as the car sensed this high voltage, the contactors opened, cutting off the main pack, then, once voltage dropped back down (Most likely the CHAdeMO Tesla Adapter’s computer) told the station to BACK THE FRACK OFF! and it did. Once voltages dropped, contactors closed again, and charging commenced.”
Supposedly, this over-voltage jump is some sort of insulation test. Is it damaging to the battery pack or other electric components? We sure hope not. Perhaps this issue will be dealt with by Tesla soon?
Below Kman was attempting to do a speed comparison of a CHAdeMO station to a Tesla Supercharger. The test didn’t work out as expected:
So, there appears to be a couple of faults with the CHAdeMO adapter and/or some compatibilities issue with the charging station and the Tesla Model S.