Prius Prime: detail about Charge-Mode

Discussion in 'Prime Technical Discussion' started by john1701a, Oct 20, 2018.

  1. john1701a

    john1701a Prius Guru

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    The genius of Toyota's approach has been flexibility. "Just drive it" provides results well above that of traditional vehicles, regardless of your driving circumstances. The addition of a plug builds upon that. When you recharge from an outlet, results are amazing no matter what you do with that electricity.

    Having the option to recharge using the gas-engine is a bonus. If you want to exploit the design to squeeze out even higher efficiency, you have that ability. It is by no means necessary or required. Some owners will never take advantage of having it. Others will exploit the opportunity. The point is, you are given that choice. So, we make an effort to explain how it works.

    Keep in mind that you also have the choice of recharging speed. For 120-volt connections, you have 8 & 12 amp options. For 240-volt connections, it is currently limited to 3.6 kW. As demonstrated by this video, you can see that 7.2 kW may be offered in the future. It's a flexible design. Toyota carefully studies how it is used & responds and tweaks choices accordingly.

    Give it a try.
     
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  2. Tideland Prius

    Tideland Prius Moderator of the North
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    eh?
     
  3. MMBH

    MMBH Junior Member

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    It's a "choice" only if people are aware of it and know how to "exploit" it. ;)
     
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  4. Chazz8

    Chazz8 Gadget Lover

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    Yes to your last statement. When the EV miles remaining goes to zero, the Prime starts the ICE and runs like your 2006 prius using (and automatically recharging) the remaining portion of the traction battery. The (forced) CHG is more aggressive and will add up to %80 of the usable traction battery charge whereas driving the Prime with zero EV miles is just managing the traction battery capacity needed for Hybrid Prius driving. So unless you are going down a big hill, it is hard to add EV miles back unless you use the (forced) CHG mode.

    Sometimes I wish i could override the Hybrid Mode when I hit zero EV miles and use the last power in the traction battery to get home. But I think it would run the remaining battery charge down very fast and it would be bad to start the ICE and not have a nice buffer of traction battery power to use while the ICE warms up to 67F-ish (observed in 2012 Prius v) and can start to contribute locomotion power with minimal emissions. Then I repeat my Prius mantra “just drive it,” and I’m happy again.
     
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  5. barbaram

    barbaram Member

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    I’m in the research phase. 2 questions:
    Is there a resource for finding charging stations?
    How difficult is it to set up charging at home?

    Thanks
     
  6. john1701a

    john1701a Prius Guru

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    The "plug share" app is quite handy for charger locations & info. Google just started adding that info to their map service too.

    For home churching, you may find this document i created handy...

    John's Stuff - Toyota Prius Prime - Home Charging
     
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  7. Prodigyplace

    Prodigyplace Senior Member

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    If slower charging (overnight) is OK the car comes with a charger than can be plugged into a normal receptacle in your garage,
     
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  8. Tideland Prius

    Tideland Prius Moderator of the North
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    In addition to the app that @john1701a mentioned, plugshare also has a website.
     
  9. barbaram

    barbaram Member

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    So I would be ok with a 10 amp circuit for that, correct?
     
  10. m8547

    m8547 Member

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    You need a 15A circuit, which is standard for 99% of residential garage circuits in the US. If for some reason you actually have a 10A circuit (I haven't heard of anyone who does), you could set it to charge at 8A max and that would work since the continuous load has to be no more than 80% of the circuit rating.

    In other words, yes you can plug it into a normal plug in your garage and that will work as long there's no other significant load on the circuit. The garage door opener and lights are OK to share the same circuit. A space heater or large power tools would not be OK to use at the same time on the same circuit, but you could unplug the car if you need to use those.
     
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  11. barbaram

    barbaram Member

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    Thanks! my garage is from the 1920’s, I wish I had an opener!
     
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  12. jerrymildred

    jerrymildred Senior Member

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    If it's that old, it might just have 10 amp circuits. :eek: Our house in Ohio was built in the 1850's. I don't know when they wired it, but there was a bunch of stuff that wouldn't pass the code these days.
     
  13. john1701a

    john1701a Prius Guru

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    An exploit most don't ever think of if using Charge-Mode just long enough on your drive the night before to provide electricity for remote warm-up the next morning. Coming out to a car with a toasty interior isn't efficient, but it certainly is nice while out on the road.
     
  14. Prodigyplace

    Prodigyplace Senior Member

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    Driving a Prius or Prime at highway speeds isn't efficient, but it certainly is nice while out on the road. :LOL::ROFLMAO:
     
  15. barbaram

    barbaram Member

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    It’s actually charging fine and we looked. It is 15 Amps with a GFCI!
     
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  16. Old Bear

    Old Bear Senior Member

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    That sounds perfect. The portable charging cord which comes with the PRIME will bring the vehicle to full charge in about 5-1/2 hours (or less if the PRIME is not fully discharged when you plug it in.)

    If you do a lot of short trips -- like to the supermarket and back home again -- you can plug in your PRIME to "top off" the battery to keep it at full charge.

    When and if you decide to get a 240-volt "Level 2" charging device, the time from zero to full charge is about 2-1/4 hours.

    How you manage your charging really depends upon your travel pattern. If you're a commuter, you charge overnight. If you're just doing lots of short errands and returning to home several times during your day, just plug in when you can. And, of course, you can also take advantage of public charging -- often provided free -- at some parking lots, parking garages, or various businesses.

    You need to develop a different way of thinking about the process. Unlike gasoline refueling, you don't benefit by "running the tank down to empty" to minimize the number of visits to the gas station. Electric vehicles want to be plugged in whenever and wherever they're parked.
     
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