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Chademo adapter performance on a Tesla model AWD with 50 KW BC Hydro Chademo station.

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Hi folks. I recently had the opportunity to use our Chademo adapter. I thought this might be of interest to some. No real point. Just more of a general board knowledge thing. This might be old news for some. For me it was kind of interesting.

I took my wifes model 3 to the BC Hydro Chademo/CCS station in town to make sure my new BC Hydro RFID cardworked as they recently switched the station from Green Lots to BC Hydro. Gave me a chance to check the Chademo adapter again before we head out on a trip that we will require it for. I pulled in with around 58 percent in the battery. It was around 7 degrees celcius and obviously no preconditioning as that only works with Superchargers. Here are a few pics of the process between 60 or so percent and 90 percent at which point I disconnected.

Bulky connector as you can see but connects pretty easy.

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First shot. Sorry. Didn't take the first shot till 68 percent but it hadn't changed from when I hooked up at about 58 percent. I think it started around 38 KW.

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Here at 81 percent almost the same. A slight rise in power and speed from 40 KW to 42 KW. .

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This is where it gets interesting, At 86 percent the power climbs to 48 KW (47 in the picture sorry)

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It hung around there for a little bit and then at 90 percent is started to drop again to 37 percent. Unplugged soon after that as a Leaf showed up looking for a charge.

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Just a guess but I think that as the battery got warmer it was able to accept a charge better, hence the climb in power. Right now you can only pre-condition when navigating to a Supercharger. I think it would be useful for tesla to allow for navigation to other sources of charging and triggering the pre-condition process. This would be especially usefull if
a. the temperature was colder
b. the Chademo adapter had a higher rating. Maybe 75 to 100 KW.

Anyway, thought it was interesting and germane to EV's in general. I'll posted this on the Leaf forum as well. My daily driver is still my 2016 Nissan Leaf SV with 30 KWH battery.

Cheers.
 
The adapter is limited to 125 amps. So as the pack voltage rises with increasing SOC, the power delivered will increase. Once you hit 90%, it started normal tapering.
Here is the voltage curve of a typical graphite Li-x cell

Screen Shot 2020-05-04 at 11.13.36 AM.jpg


It is about 3.5 volts at 20% SoC and 3.8 volts at 80% SoC
The Tesla pack is 96S so at 20% SoC the pack voltage is 3.5*96 = 336 Volts and at 80% SoC the pack is at 3.75*96 = 360 volts
If the charge was a constant 125 Amps then at 20% SoC the pack would take 336*125 = 42 kW and at 80% Soc it would take 360*125 = 45 kW. Every 10% increase in SoC from 20% up to 80% would increase the power 0.5 kW. Deviations from these powers are probably explained by battery temperature.

The battery temp at the start of a day's driving is just about guaranteed to be lower than ambient.
 
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