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What's the rational for no DRL with range mode?

Discussion in 'Model S' started by Firewired, May 10, 2017.

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  1. Firewired

    Firewired Member

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    My car is a 2014 and I have been in a 2017 loaner. I was surprised to find that there are no DRL whenever range mode is on. What can possibly be the rational behind that? There is no way there is any significant difference in range from the draw of the DRL LEDs.
     
  2. Lloyd

    Lloyd Well-Known Member

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    Every little bit helps!
     
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  3. Hazelwood

    Hazelwood Member

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    Is your question, why would they want to minimize power consumption when trying to increase range?
     
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  4. Firewired

    Firewired Member

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    I would argue the the power consumption of the led DRLs is negligible compared to the power required to propel a 5000# vehicle even with a low coefficient of drag against the wind resistance at highway speeds. If they are not, there is something seriously wrong with them.
     
  5. tpham07

    tpham07 Member

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    When you have a finite amount of power and are trying to maximize range, every watt counts. Isn't that the point of range mode? to extend you running out of juice by a couple miles? That could be the difference between a freeway and charging outlet.

    You're not supposed to drive with range mode always on so i'm not sure what the problem is. The way i see it, its an emergency feature only.
     
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  6. EarlyAdopter

    EarlyAdopter Active Member

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    I thought it was a little strange, too.

    You can turn the DRL back on while in Range Mode if you turn the "parking" lights on.
     
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  7. chillaban

    chillaban Active Member

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    What's your definition of negligible though? Is 5 extra miles on a 300 mile range negligible?
     
  8. croman

    croman Active Member

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    5 miles of range = 293wh*5=1.465kwh. No way those DRLs draw that much power. Lets say 30W for the both of them. 5 miles of range would be ~490 hours of operation. If the DRLs draw 100W total, 14.65 hours of operation. Maybe someone knows their power draw.
     
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  9. chillaban

    chillaban Active Member

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    That's assuming 5 miles traveling at the speed of the EPA combined cycle. If it takes me 1 hour to move through 2 traffic lights (which does happen on some of my errand runs in SF), even 30W per DRL ends up being somewhat significant.
     
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  10. Max*

    Max* Banned

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    #10 Max*, May 10, 2017
    Last edited: May 10, 2017
    60wH, or 0.06kWh, of a 100kWh battery, so 0.06%. I'd say no, not significant.

    You would save 0.2 miles in range, roughly.


    Also, I doubt the LED DRLs use 30W each, i'd guess it's a lot less; which means you would save even less distance.
     
  11. xbox4me62

    xbox4me62 Member

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    The LED DRLs are definitely less than 30W each. They are probably less than 30W combined.
     
  12. mal_tsla

    mal_tsla Member

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    On the model X the DRL are EL Tape. Seems like EL Tape uses about 6W per square foot. I've not measured how many sq.ft. the DRLs on the X are, but it's probably 1 or 1.5 total, so that would be in the neighborhood of 9W, less than the charge rate on an iPad.

    It seems like the DRLs are off in Range Mode "for no good reason." This begs the question, why are the DRLs there in the first place? One might say they're there for safety -- so oncoming traffic can see you easier. If that's the case, it seems unwise to turn them off in order to save almost immeasurably small amounts of power.

    Lite Tape (EL Tape) Energy Consumption
     
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  13. Mattzilla

    Mattzilla Member

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    Wish they would give us the option for DRL on/off (like we had before) and maybe even access to brightness settings. Shouldn't be too hard to implement.

    The current setup, which disables DRL when range mode is switched on (even though there is no verbiage in the settings that warns you that this will happen), is idiotic.
     
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  14. Gizmotoy

    Gizmotoy Active Member

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    It seemed like all cars suddenly started coming with DRLs overnight, so I always thought it was a federal mandate here in the US. It seemed unusual to me that the Model S allowed me to turn them off, since that wasn't the case in any other car I've owned since they started becoming commonplace. I was surprised to find they're not technically required, and a bid by GM to make them mandatory failed in 2009.

    So with that in mind, and the fact the toggle was already there (at least on older cars), why not just let the owner decide? Have it turn off automatically with range mode if you want, but allow the user to turn it back on without forcing all of the parking lights.

    Strange decision on Tesla's part, I think.
     
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  15. Zaphod

    Zaphod Galaxy President (former)

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    Pretty sure DRLs are required to always be on in Canada. Makes you wonder how a Canadian car in range mode would operate?
     
  16. chillaban

    chillaban Active Member

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    I'm quite sure they're always on in Canada. FWIW, Tesla PR repeatedly insisted that they aren't DRL's after the refresh. They're signature lights. *shrug*, Subway dude, Sandwich Artisan, whatever, just let me control my DRL usage in Range Mode!
     
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  17. Mattzilla

    Mattzilla Member

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    Seems they are going the Apple route of less user customization in the name of simplicity and optimization. I understand that trade offs have to occur for that model to work, but what I don't understand is removing a feature that worked fine and replacing it with paternalism. And then not telling anyone (again, no mention of this in the car when you hit the "I" next to range mode).
     
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  18. Hugh Mannity

    Hugh Mannity Mediocre Member

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    I tried it, makes no diff, DRL always on for my Canadian spec car. The LED are bright but they must be very low power, 10W each or less?? I would think.
     
  19. mal_tsla

    mal_tsla Member

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    Fwiw, EL Tape isn't dimmable. So brightness would only work on cars with LED DRLs.


     
  20. Pipcecil

    Pipcecil Member

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    Hmm I wonder if this only affects newer models. My 2013 in range mode keeps the DRL on or maybe the range mode is significantly different in the newer models. As far as I was told (and read) the range mode only really affects climate control use
     

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