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How long would the rimac last on a charge at full power?

Discussion in 'Electric Vehicles' started by theboom1, Sep 13, 2016.

  1. theboom1

    theboom1 Member

    Joined:
    Apr 24, 2016
    Messages:
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    Location:
    Alabama
    Me and a friend were talking and I don't know the math. How long would the rimac concept one(1088hp) and concept s(1,365hp) last at full power with their 82kwh battery. I very vaguely remember seeing someone do the math and I can't remember if he was talking about the concept one or concept s but I think it was the s, but he said that at full power assuming no electrical energy losses in the drivetrain that it would last around 4 min making the full 1mw. Is that true? Because I have no idea on the math. Im just wondering how far battery technology needs to go for performance cars to match what we have now with ICE's.

    That is with full power, around a track you can probably double that because you are not at full but a few parts of the lap. The holy trinity in their hot lap modes were used to lap the nurburgring, was said to have almost fully depleted batteries by the end of the lap so probably at the most they hap 8 min lapping and 4 min at full power. But they are hybrids so when the batteries run dry you still have the engine that you can drive and if you do some "charge" laps you can recharge that batteries. Now as far as ICE's go the new Bugatti Chiron I read that at full throttle, it will burn through a tank in about 9 min. The unspoken "acceptable" standard that I have observed for an ICE is being able to track for 20-30 min (so full throttle maybe 15 min). So if that math is right for the concept s and it is full power for 4 min that means tracking for 8, so that means we need 3x the battery capacity to get right into that sweet tracking range at 24 min? Maybe 4x to really tie it up? Also we don't know yet but im thinking rimac has cooling issues fixed.

    So ya basically what is the math for how long will the 82kwh battery will last making 1088hp and 1365hp?
     
  2. Cloxxki

    Cloxxki Member

    Joined:
    Aug 20, 2016
    Messages:
    783
    Location:
    Rotterdam
    1000kW is 1340hp.
    So let's take that.
    (82kWh/1000kW) * 60 minutes = 4.92 minutes.

    Not too bad for the most desirable electric car, as the most desirable ICE car (Bugatti Chiron) lasts 9 minutes (100 liter tank, which is a lot).

    Now in reality, Rimac will not be able to handle so much power for so long (things get hot). Its top speed is also just over 330kph I think, which should translate to 350kW or so. That triples run time at top speed. A non-stop 1MW effort with long enough gear ratio would result in closer to 450kph.

    In car racing, even fuel based, gas economy is key. In F1, you are only allowed a 100kg/hr fuel flow. In a 305km race, you get to use only 105kg.

    For longer electric racing, swappable batteries are a no-brainer.
     

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