Elaphe claims winter losses will be lower than traditional EVs

Aptera Community Aptera Discussions Elaphe claims winter losses will be lower than traditional EVs

Aptera Community Aptera Discussions Elaphe claims winter losses will be lower than traditional EVs

  • Elaphe claims winter losses will be lower than traditional EVs

     Elzo Stubbe updated 3 months ago 6 Members · 8 Posts
  • Curtis Cibinel

    Member
    March 23, 2022 at 12:03 pm

    Steve from Aptera Owners Club posted an Elaphe Webinar looking at system efficiency. It is very dry but makes some major claims about efficiency advantages due to reduced number of components subject to temperature sensitive components; specifically in winter. It is possible this could offset the efficiency disadvantages of a non heat pump system for the cabin. Reducing components and having a highly efficient drivetrain allows the system to do more practical work with less energy. The first 15 minutes is mostly intro but they get into efficiency graphs and analysis around 22 minutes in.

    One interesting thing is the efficiency graphs show a weakness in the IWM at low speeds so it might be closer to 35-40 mph where Aptera will run optimally for hypermiling (vs 20 mph used in a Tesla). Oddly Aptera would probably be less efficient overall at speeds under 35 mph because wind resistance is nearly negligible and the drivetrain will run less efficiently than other EVs in those rpm ranges.

    https://www.youtube.com/watch?v=b1m_QeJHMvU

  • Raj Giandeep

    Member
    March 23, 2022 at 2:19 pm

    Didn’t consider the cold range loss would be less with in-wheel motors. Another positive for Aptera. Strange they didn’t post this to their YouTube channel

  • Benjamin Dreidel

    Member
    March 23, 2022 at 7:16 pm

    The cold range loss may be less in terms of efficiency or kwh, but the cold range loss in miles will almost certainly be a relatively high %. In any other EV, a kwh that goes to heating the cabin/battery will only lose you 3-5 miles of range but in the Aptera it will lose you 10 miles.

  • kerbe2705

    Member
    March 23, 2022 at 9:37 pm

    During one of the early Aptera webinars we were told that the aero advantage doesn’t really come into play at speeds under 45 mph.

    • Nathan Hubbard

      Member
      March 24, 2022 at 8:20 am

      It has long been said that aerodynamics don’t really matter much below about 40mph, so that seems reasonable. Being a three-wheeled vehicle has an advantage of less rolling resistance though, and that always matters.

  • Curtis Cibinel

    Member
    March 23, 2022 at 10:06 pm

    The following is my range estimate calculation tool; make a chippy to play with values. You can use this see see aerodynamics impact on range. Going from 20-40 mph is a ~4x increase in air resistance while auxiliary load and rolling resistance remain unchanged. The tool assumes a static drivertrain efficiency percentage (which this article shows isn’t true) and does not account for auxiliary load (radio, displays, and heater). Rolling resistance might be to high based on other sources (but none that are official exist); I used typical car rolling coefficient of 0.1.

    We have 4 factors to consider overall :

    – auxiliary load which varies mainly by temperature

    – rolling resistance which varies only be vehicle /passenger weight

    – air resistance which varies by speed (and equals rolling resistance at about 47 mph)

    – drivetrain efficiency which varies by temperature, speed and torque (weight) – this is what elaphe just covered

    https://docs.google.com/spreadsheets/u/0/d/1Tuu7avKH2dS_JPk7aiP2av09a1f1WE0OvvNH6fdHpiQ/htmlview#

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