Preconditioning Use Cases

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

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  1. DC1

    DC1 Member

    Here are some personal findings for preconditioning in cold weather (from 32F / 0C). Can any one confirm/correct?

    Key Fob button:
    Seems to be useless / nonfunctional? (Lights blink once when I hold down fob, but not sure if it does anything.

    On Demand via App
    Unplugged: Yes, seems to warm up in about 15-20 mins
    While plugged into Level 2 Charger: Yes, seems to warm up in about 15-20 mins
    While plugged into Level 1 Charger: Only when charging is stopped, but warms up way too slowly to be useful in real life

    Scheduled via App:
    Unplugged: Unsuccessful
    While plugged into Level 2 Charging: not tested yet (probably works well)
    While plugged into Level 1 Charger: Warms up way too slowly to be useful in real life
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  3. MNSteve

    MNSteve Well-Known Member

    This is the only scenario I have used, and I agree that preconditioning using a L1 charger is useless.
  4. Clarity Dave

    Clarity Dave Member

    I've successfully started preconditioning using the key fob. To make it work, you have to press the lock button first.

    It confirms the start of preconditioning by blinking several times (the manual says six times - see page 199 for details).
    insightman, 228ra, DC1 and 1 other person like this.
  5. ClarityDoc

    ClarityDoc Active Member

    Indeed, works great when connected to L2 (scheduled and ad hoc, fob or app).

    Sent using Inside EVs mobile app
  6. AlAl

    AlAl Active Member

    +1. It's really slow, but takes the curse off the morning drive. Heat comes on at full blast by the time I get to the end of the street, vs waiting few minutes.
    On the plus side, it maintains battery SoC if you precondition w/ LVL1
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  8. Atkinson

    Atkinson Active Member

    Pre-conditioning draws 5 Kw when the heat comes on (can't remember what AC draws - - Alzheimer's)
    Heat uses almost all the L2 capacity until the water gets hot, so there will be contention for charging.
    I usually wait till 95% when the charge rate tapers on it's own.
  9. skelter

    skelter New Member

    I recently moved to Canada and brought my US Clarity with me. I had a level 2 charger installed and was pretty excited to use the scheduled preconditioning in the mornings. Unfortunately, it's unsuccessful most of the time. I'm not sure why it always fails. It could be due to it being a US car and maybe the HondaLink connection doesn't work as well now that it's in Canada. That said, manually starting from the app works as does the fob. After 5-10 minutes, I can definitely see the snow/ice melting off the windshield.
  10. KentuckyKen

    KentuckyKen Well-Known Member

    @Atkinson is right about the high draw. Here is a graph from my Charge Point app showing its almost 6 kWs at its peak. The first part is charging and the second peak is preconditioning after charging is complete. No wonder cabin heat drains our SOC and range!
    Kendalf and insightman like this.
  11. V8Power

    V8Power Active Member

    I use app triggered preconditioning at work unplugged and it works great to warm or cool car within 5 minutes.

    Sent from my iPhone using Inside EVs
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  13. DC1

    DC1 Member

    Based on the informative responses, here is my new understanding of how this works.

    Plugged into L1:
    Modes Supported: Scheduled and On-Demand
    Slow cabin temp change. Seems to take about 50-60 mins from 32F -> 70F cabin temp.
    Still useful as "strict preconditioning" -- since heater / AC comes on as soon as you start the car.

    Plugged into L2:
    Modes Supported: Scheduled and On-Demand
    Notes: Goes from 32F -> 70F in about 20 minutes

    Modes Supported: Only On-Demand
    Notes: Goes from 32F -> 70F in about 20 minutes, but uses up to 10% of battery charge
  14. Ray B

    Ray B Active Member

    Is the system heating up more than cabin compartment and seat? I guess I don't understand such a high power draw. I have a small 1500W space heater (120V) at home that could probably heat up the car cabin 10 minutes (now I will have to try it out to see), and even on the low power 750W setting it spews out lots of heat. For the small size of a cabin compartment, I'm surprised that an L1 charger can't manage to power something that can heat up the cabin in 20-30 minutes. Unless the heat is for heating up other stuff as well. Just seems strange to me.
  15. DC1

    DC1 Member

    I might be wrong about the L2 time. Might be closer to 10 mins than 20 mins. I think the unplugged time is closer to 20 mins though.
  16. HarryV

    HarryV New Member

    Hi, I'm intending to buy a Clarity here in Mass., no garage at home, L1 charger. Wanted to know whether it is necessary or advantageous to use the Honda App for preconditioning vs. the key fob, and therefore whether the Touring model was preferable vs. the base model. Other posts said something about the need to end charging before preconditioning on L1 using the app; can that also be done using the fob?
  17. DC1

    DC1 Member

    There is no difference between touring and base for preconditioning via key fob or app. I have the base and it works well with both.

    There is also no apparent difference in how well preconditioning works for the app or the fob either.

    You can stop charging manually and start preconditioning if you need. (And it will auotmatically re-start the charging along wih preconditioning.)

    By the way to take advantage of $2500 Mor-Ev credit which PHEVs will no longer qualify for starting 1/1/2019, I recommend buying one ASAP.
  18. Atkinson

    Atkinson Active Member

  19. Atkinson

    Atkinson Active Member

    Is there a charging station near your home or at your workplace?
    That's all you need.
  20. Atkinson

    Atkinson Active Member

    Heating elements have to heat up water which gets pumped to the heater core.
    Half of that system is exposed to the environment, so there are losses.
    This system really throws heat on a cold day, so it will draw serious amperage.
    Contrasting that, we had a Honda Fit EV and the heater was barely able to keep up with below zero degree days.
    It was probably sized for the limited battery capacity which also limited pre-condition performance.
  21. MNSteve

    MNSteve Well-Known Member

    But only if it can, which translates to, only if it is connected to a L2 charger. My experience on a level-1 charger is that the benefit of preconditioning is limited to the heater operating immediately when I start my trip. If my cabin temperature starts at 20, preconditioning might raise it to 30 after 15-20 minutes.
  22. HarryV

    HarryV New Member

    Thanks a lot, DC1 -- exactly the information I was looking for!
    DC1 likes this.
  23. HarryV

    HarryV New Member

    At my work garage there is a charger and I think it's free! I was mainly concerned about preheating at home in the morning using a 120V circuit. 20°F is not unusual at this time of year.

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