It feels kind if dumb to see such configuration and I have worries If I drain small 12v battery by using car with engine off It wouldn’t start…

  • deliux@discuss.tchncs.de
    link
    fedilink
    English
    arrow-up
    24
    ·
    1 year ago

    The main reason why you will alway have a low voltage battery is safety: It is used to actuate the contactors for the HV Battery. You would not want un-switchable HV components. For example in the event of a crash the HV battery gets completely disconnected but airbags and indicators will still work. The 12v battery will get charged off the main hv battery if it gets low btw.

    • WagnasT@iusearchlinux.fyi
      link
      fedilink
      English
      arrow-up
      12
      ·
      1 year ago

      to piggyback off this, 12V components are also everywhere else, so you can use off the shelf components like lights, wiper motors, etc without having a limited production run for high voltage components, which keeps costs down. Doing it this way made it possible to add hybrid systems to traditional vehicles like a camery or an escape. This also enables you to jumpstart a hybrid with another 12V system.

      TLDR: money, compatibility, safety