Preconditioning Use Cases

Discussion in 'Clarity' started by DC1, Dec 12, 2018.

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  1. V8Power

    V8Power Active Member

    I regularly do unplugged preconditioning from freezing temperature to room temperature and it only takes about 5 minutes roughly.
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  3. weave

    weave Active Member

    Preheating on L1 isn't a waste since it's going to warm up the fluids at least and get the heater going faster. It also most like is warming up the battery some as well.
  4. KentuckyKen

    KentuckyKen Well-Known Member

    This is easily explained.
    Fastest preconditioning is either by a Level 2 EVSE or by the car’s 17 kW battery since these 2 options have way more power than the OEM Level 1 EVSE. The only significant difference will be that preconditioning off the battery will reduce the SOC and subsequently EV range.

    Let’s do the math.
    Preconditioning can draw up to 5 to 6 kW at its peak and then tapers off.
    The Level 1 EVSE is rated at 12 Amps on 120 v or (12x120) 1.44 kWs max. It can’t charge and precondition at the same time and even when just preconditioning alone can’t provide the same energy as a Level 2 EVSE rated at 32 Amps on 240 v or (32x240) 7.68 kWs max.
    So the Level 2 EVSE is ~ (7.68/1.44) 5.33 times stronger than the Level 1. This also explains why Level 1 charging takes ~12 hours and Level 2 takes about 2.25 hours (2.25hrx5.33=~12hr).

    So bottom line is that Level 1 EVSE can precondition but at its max 1.44kWh rate, it’s going to be about 5 times less powerful than a Level 2 EVSE that can deliver up to 7.68 kWhs. And it needs every bit of that puny 1.44 kWh to precondition so it can’t charge at the same time. (However, in the interests of accuracy, the most that’s been reported is about 7.2 kWh sustained rate and the Level 1 has to be likewise a little less than 1.44 kWh. And those numbers are slightly reduced I’d you dont have the full 120 or 240 v at your outlet. But the principle and ratios still hold. Entropy reigns supreme and you can’t fight the Laws of Thermodynamics.)

    Therefore don’t expect your Level 1 EVSE to get your Clarity as toasty warm as a Level 2 or the unplugged battery on a very cold day. It’s just not got the power. It is better than nothing and as posted above can help a little with the cabin temp and gets the heater throwing out hot air much quicker at start up.

    I’ve found that a Level 2 EVSE and a garage make a world of difference in comfort and range in the wintertime.
    So upgrading to a Level 2 EVSE (if possible) is not just for the odd time you need a second charge in the middle of the day, but it’s also for comfort. And of course the nicer and more expensive models with tracking apps let you monitor your consumption and cost easier.

    PS: I’m a Bio guy so you EEs out there please correct anything I got wrong. Im still trying to figure out a 3 way light switch!!
    insightman likes this.
  5. MNSteve

    MNSteve Well-Known Member

    EE speaking: You have it exactly right. I had decided that I couldn't justify a L2 charger because almost always an overnight charge fits my driving patterns just fine. But the ability to do effective preconditioning has added another parameter to that decision.
    Robin likes this.
  6. LAF

    LAF Active Member

    I find I don't need the car to be 70 when I enter in the morning. In fact since I will be wearing a coat this is too hot. If the temp is 40 or more that really takes care of most of the neg effect of starting a trip on a cold morning.
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  8. MNSteve

    MNSteve Well-Known Member

    Completely agree. But with a L1 charger, getting it up to 40 is not an option when it starts at 20.
  9. LAF

    LAF Active Member

    that hasn't been my experience- takes about 25 min.
  10. dnb

    dnb Active Member

    This is why I'm thinking of getting one TBH, I rarely need the charge during the day but preconditioning is important as I park outside and have to reverse near a blind corner when leaving my house. So when the level 1 runs for 30 minutes and the cabin is still cold / rear window still hard to see through.... kind of a problem :(
  11. MNSteve

    MNSteve Well-Known Member

    I have not yet reprogrammed my mindset that I need to think that far ahead, so I've not actually let it run that long.

    I stopped by a public level-2 charger today, plugged in, got in the car, and used the HondaLink app to turn on pre-conditioning. The difference was dramatic. With level-1, it's very anemic. With level-2, it's quite capable.
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  13. SThomas219

    SThomas219 Active Member

    I think I understand but want to make sure.

    I schedule charging via the app at 2AM every day via a Level 2 charger.

    If I manually start or schedule pre-conditioning while it is still plugged in, it will start charging again automatically?
  14. RogerB

    RogerB Active Member

    On my L1, I'm pretty sure the scheduled preconditioning doesn't start if it is not fully charged. Paraphrasing, it says something about another operation/action is currently underway. When I get that message in the morning, I manually stop charging with the app and then start PC. When I do it that way, charging starts back up automatically when the PC starts.
  15. SThomas219

    SThomas219 Active Member

    Confirmed....when turning on Climate from the app, charging restarts using a L2 charger. Nice to get into a warm car on a cold morning.

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