I think you nailed it. The Y has a Cd of 0.23 according to a few sites I
checked. That's a pretty awesome number compared to almost any other
car.
If your test driving includes a lot of steep hills or starts and stops,
the Cd probably won't make much difference. I presume you are driving
mostly at constant speeds on relatively level ground. In the latter
case, the rolling resistance and Cd are the important factors.
Also, residential streets versus highways make a difference, of course.
The Cd has little effect until you get close to highway speeds.
Peri
<< Annoyed by leaf blowers ? https://quietcleanseattle.org/ >>
------ Original Message ------
From: "Mark E. Hanson via EV" <ev@lists.evdl.org>
To: "'Electric Vehicle Discussion List'" <ev@lists.evdl.org>
Cc: markehans...@gmail.com
Sent: 26-Oct-23 06:58:13
Subject: [EVDL] Tesla-Y KWH Efficiency
Hi Folks,
I was curious why my Tesla-Y that's 4400 pounds came out ahead of my
conversions over the years (80's-2011) that averaged 334 watt hours per mile
or 3 miles per KWH (weighed closer to 2000lbs). The Tesla-Y display which
is DC at the battery, shows 244 watt hours per mile. I measured at the AC
outlet (actual KWH usage) with the KWH meter on OpenEVSE.com, also matched
the Tesla screen display at 36.77 KWH.
The car traveled from 72,553 to 72,414 or 139 miles. 139/36.77=3.78 miles
per KWH or 264.5 watt hours per mile. With the car display at 244 watt
hours per mile, that's a 7.7% efficiency loss through the onboard charger,
so impressive aero efficiency as indicated on the InsideEVs website
comparing all EVs. Conversions are probably less efficient do to poorer
aero efficiency that takes an exponential hit at highway speeds.
I was initially going to buy a Tesla-3 (now advertised at $37K) but said *no
towing* and the Y showed 3500 pounds of towing needed for towing my 5x8
trailer for solar panels/concrete/racking (solar volunteer club) and boat.
Not sure why the Tesla-3 says no towing when it uses the *same* drivetrain.
BTW, I'm taking the advice of some and going to the dealer with the Bolt to
get the $1400 bait software 80% for 6200 miles - since the 2020 model
battery issues are less than 1% (most occurred in previous years 2017-2019).
Have a renewable energy day,
Mark
Mark E. Hanson
184 Vista Lane
Fincastle, VA 24090
540-473-1248 phone & FAX, 540-816-0812 cell
REEVA: community service RE & EV project club
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75b8d/signature> Fincastle Solar Weather Station
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