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680-mile road trip planned with cargo carrier on top...

jessem

New Member
Aug 26, 2015
3
0
Lehi, UT
Hey forum,

We're planning on taking a road trip in December down to Phoenix, Arizona. I ordered the whispbar roof rack system and have this cargo carrier. I have the 70D (as of about a month ago). We'll be carrying two adults and five kids between the ages of 3 and 11. All said, I just want to make sure my range won't be killed. I'm concerned about loss of range from:


  • the cargo carrier on top reducing aerodynamics
  • the cold weather during the first half of our trip (between 20-50 degrees)
  • the additional weight of the passengers.

The car will obviously compute where we should supercharge. I just hope it's not off...
 
Where are you traveling to and from? I bet that carrier is going to put a big dent in your range, but if there is good SC coverage it won't matter much. I have not noticed additional weight making a noticeable change for range. Cold weather range loss is overstated, IF, you are moving. If you are in traffic or city driving and the heaters are working and you're not moving much, the WH/M will be hit fairly hard.

Remember that a cold soaked battery won't Supercharge fast, plan accordingly especially for a morning Supercharge.

Have a good adventure, I picture you like Clark Griswold in the family truckster.
 
I don't have your setup on my Tesla, but I do on my ICE. Yes, your range will be absolutely killed. You should do some testing beforehand to see what is the increased energy use. Your Rated Miles on your battery indicator will not show less range. You will just use more Wh/mi so you have to take that into account.

I'm just going to guess, but from your description and link, I'm going to add a 20% penalty at 75mph from my ICE experience. Test it and get back to us!

- k
 

andrewket

Well-Known Member
Dec 20, 2012
5,704
1,543
Definitely don't count on rated. Use estimated on the nav. Once you know what your nominal Wh/mile is you can do the math. Preheat the cabin when you're still plugged in. Consider range mode and use the seat heaters.
 
Last edited:

CHG-ON

Still in love after all these miles
Give yourself a 30% buffer. I use 25% without a roof carrier and it works well for me. Fortunately, they have improved SC coverage on that route. It was pretty bad a year ago.

I think the old rule applies: slow and steady wins the race. Though it can be painful for those (me) who want to charge on through.
 

Discoducky

P100DL, 2021 M3, 4 CT reservations and counting
Supporting Member
Dec 25, 2011
4,929
24,481
My mountain
Preheat the cabin, keep the climate set to auto at a low temp to keep the windows from fogging, ensure tires are inflated correctly, wax the car ;)

Always, supercharge to max range, use range mode and use EVtripplanner, but you might want to consider going with a rear hitch and storage instead of on top as it is much more aerodynamic

EVTripplanner with these settings only shows a max of 150 rated miles used max between the superchargers

Screen Shot 2015-11-06 at 7.40.55 PM.png
 

AudubonB

One can NOT induce accuracy with precision!
Moderator
Mar 24, 2013
9,127
40,188
Although I doubt that even with your cargo on top and sticking to the speed limits you'll have any problem making each SpC site on the way south, I think it a good idea to monitor each of those legs very carefully and, if any of them appears close, then for the return - "uphill" - leg, consider dropping your speed by some appropriate amount; at a guess 10mph would easily do it. But my guess is that even that won't be necessary...except I've encountered some pretty interesting winds, and snow, in that stretch between St. George to Beaver and beyond.
 
Hey forum,

We're planning on taking a road trip in December down to Phoenix, Arizona. I ordered the whispbar roof rack system and have this cargo carrier. I have the 70D (as of about a month ago). We'll be carrying two adults and five kids between the ages of 3 and 11. All said, I just want to make sure my range won't be killed. I'm concerned about loss of range from:


  • the cargo carrier on top reducing aerodynamics
  • the cold weather during the first half of our trip (between 20-50 degrees)
  • the additional weight of the passengers.

The car will obviously compute where we should supercharge. I just hope it's not off...

Based on the whisper and snowboards, I think the cargo carrier is going to penalize you 15%+ at 70mph.
 

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