SageBrush wrote: ↑
Tue Aug 18, 2020 6:42 pm
lorenfb wrote: ↑
Tue Aug 18, 2020 5:21 pm
salyavin wrote: ↑
Tue Aug 18, 2020 11:05 am
for that distance of drive it is fine at 90mph out here. Waste of charge but will not build up enough heat to cook the battery.
It's really the DCFCs that get you as it can't get rid of heat as you know but they didn't need that. Remember 30 miles there and 30 miles back.
So you've checked the battery temperature after a lengthy drive at 90 MPH with the AC on with a 10-15 degree temp differential, right?
Or are you just guessing, if not provide your temperature readings using LeafSpy. Also, are you claiming
like some that a moving Leaf
can reduce the battery's temperature, if so fully example how that can occur. So given your inference, TMS is only necessary when QCing,
and neither ambient temperatures nor temperature rises due to motor currents require TMS, right?
I had the same thought as you Loren but if he really did use 40% of the 40 kWh battery to travel 60 miles
that works out to 266 Wh/mile. No way anything but a small part of the drive was much over 65 mph.
As you say, a 45 minute drive at 90 mph would cook the battery. I don't have the LEAF CdA handy but the Bolt Aero resistance is 800 Newton at 87 mph, equal to about 32 kW. The LEAF will be higher, and the other losses and AC are icing on the cake. Easily a CHAdeMO equivalent and without any taper
Isn't his vehicle is a Leaf 2 (62 kWh battery), which results in 24.8 kWh (40% of 62 kWh) for 60 miles (2.4 miles/kWh, 413 Wh/mile),
which sounds about what one would expect his efficiency to be at a speed much much greater than 55-60 MPH.
My 40 kWh Leaf at 50-55 MPH does about 4.5 - 5.0 miles/kWh (212 Wh/mile). At 90 MPH is going to be significantly higher (~ 2X, (1.5)^2).
Bottom line: He really needed to have provided a battery temperature reading using LeafSpy.
#1 Leaf SL MY 9/13: 76K miles, 47 Ahrs, 5.0 miles/kWh (average), Hx=70, SOH=73, L2 - 100% > 1000, temp < 95F, (DOD) > 20 Ahrs
#2 Leaf SL MY 12/18: 10.3K miles, SOH 109Ahrs/115Ahrs, 5.2 miles/kWh (average), DOD > 20%, temp < 105F