Charging When Plugged In

Discussion in 'Prime Main Forum (2017-Current)' started by RovinRon, Jun 23, 2021.

  1. RovinRon

    RovinRon Junior Member

    Joined:
    Sep 7, 2020
    23
    12
    0
    Location:
    Federal Way WA./Sun City AZ.
    Vehicle:
    2017 Prius Prime
    Model:
    Plug-in Advanced
    We leave our Prime in AZ. for the summer and of course all the manuals are there as well. When you plug it in to charge the traction battery, does it also charge the house/start battery? Evidently, according to our house watcher there, it won't start now. I probably should have disconnected the house/start battery? Thanks for any suggestions.
     
  2. schja01

    schja01 One of very few in Chicagoland

    Joined:
    Apr 22, 2005
    1,454
    990
    0
    Location:
    Chicagoland
    Vehicle:
    2018 Prius
    Model:
    Prime Advanced
    It does not charge the 12v battery when plugged in. Most leaving car unused have learned to leave a maintainer/tender/smart charger attached to prevent damage from completely discharging of the 12v battery.
     
    bisco likes this.
  3. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    94,221
    42,710
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    leaving it plugged in depletes the 12v even faster. but for 6 months, you want the maintainer mentioned above, or disconnect the neg cable if you don't mind losing a few presets
     
    MTN likes this.
  4. RovinRon

    RovinRon Junior Member

    Joined:
    Sep 7, 2020
    23
    12
    0
    Location:
    Federal Way WA./Sun City AZ.
    Vehicle:
    2017 Prius Prime
    Model:
    Plug-in Advanced
    Thanks, appreciate the comments and suggestions. Will get our neighbors to plug a trickle charger in for the start battery.
     
  5. RovinRon

    RovinRon Junior Member

    Joined:
    Sep 7, 2020
    23
    12
    0
    Location:
    Federal Way WA./Sun City AZ.
    Vehicle:
    2017 Prius Prime
    Model:
    Plug-in Advanced
    Opps, also please pardon my lack of knowledge with a trickle charger. If I remember, the idea of a trickle charger will first bring the battery to full, or close to full charge, then maintain its level for you. Do I have that correct? Then, is it safe or advisable to leave it plugged in for for long periods of time, such as 5-6 months unattended? Any suggestions of brand of charger for that? Thanks
     
  6. Trollbait

    Trollbait It's a D&D thing

    Joined:
    Feb 7, 2006
    16,961
    8,130
    0
    Location:
    eastern Pennsylvania
    Vehicle:
    Other Non-Hybrid
    Be sure to get a battery maintainer, which is a trickle charger that is smart enough to not over charge a full battery. That can be left plugged in.

    The car shouldn't be left plugged in for extended periods. Unlike lead-acid, Li-ion batteries prefer being kept under full charge for best life. it never gets fully charged, but the manual advises against leaving it plugged in.
     
    RovinRon likes this.
  7. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    94,221
    42,710
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    leaving it plugged in doesn't keep the hybrid battery topped up, it drains the 12v.

    the car should not be left for long periods of time with any wall charge left. toyota recommends driving it until the engine comes on, then storing at that state.
     
  8. RovinRon

    RovinRon Junior Member

    Joined:
    Sep 7, 2020
    23
    12
    0
    Location:
    Federal Way WA./Sun City AZ.
    Vehicle:
    2017 Prius Prime
    Model:
    Plug-in Advanced
    Thanks - I had read that in the manuals about the traction battery. I'm assuming that the start battery is the usual lead-acid type.
     
  9. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    94,221
    42,710
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    correct
     
  10. Gokhan

    Gokhan Senior Member

    Joined:
    Oct 5, 2008
    1,227
    568
    0
    Location:
    Paramount CA
    Vehicle:
    2021 Prius Prime
    Model:
    Limited
    To charge the 12 V battery ("auxiliary battery"), charge the PHV battery first. Turn the car on with ready displayed and set it to the EV mode. Leave the car on in ready in the EV mode for several hours with the A/C and lights off. This will fully charge the 12 V battery.

    If the 12 V battery is dead, get a jump start, and then follow the initialization procedure described in the repair manual, which I posted in the maintenance forum.

    Prius Prime initialization procedure after the battery is disconnected | PriusChat
     
    #10 Gokhan, Jun 24, 2021
    Last edited: Jun 25, 2021
  11. Trollbait

    Trollbait It's a D&D thing

    Joined:
    Feb 7, 2006
    16,961
    8,130
    0
    Location:
    eastern Pennsylvania
    Vehicle:
    Other Non-Hybrid
    Which is fine if you are there to do it on a regular basis, say once a week or so. But a battery maintainer is the best course for the starter battery's life.
     
  12. Gokhan

    Gokhan Senior Member

    Joined:
    Oct 5, 2008
    1,227
    568
    0
    Location:
    Paramount CA
    Vehicle:
    2021 Prius Prime
    Model:
    Limited
    You don't need special maintenance for the 12 V battery if: (a) you drive the car regularly and (b) you charge the PHV battery regularly and (c) you avoid short HV trips and (d) you drive in the EV mode for at least once a week and (e) you don't sit in the car with the car not in the ready mode but with lights etc. on.

    If you obey these five principles, there is no reason for the 12 V battery to discharge. However, many people don't drive in the EV mode but do short HV trips, which could quickly discharge the 12 V battery, not to mention that it could cause carbon deposits and other problems in the internal-combustion engine. I never use the HV mode for short trips but only for long trips, which is the correct way of driving the Prius Prime.
     
    #12 Gokhan, Jun 25, 2021
    Last edited: Jun 25, 2021
  13. Trollbait

    Trollbait It's a D&D thing

    Joined:
    Feb 7, 2006
    16,961
    8,130
    0
    Location:
    eastern Pennsylvania
    Vehicle:
    Other Non-Hybrid
    In the OP, the car sits, undriven, for an entire season. Or at least long enough that the starter battery had drained to the point that it couldn't start the car. Many people would leave their car sit for long periods even before the pandemic. For those people, a battery maintainer is the best solution to get the best performance out of the 12 volt.
     
    Ovation likes this.
  14. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    94,221
    42,710
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    well, some people aren't interested in the thread topic when posting
     
    Trollbait likes this.
  15. Gokhan

    Gokhan Senior Member

    Joined:
    Oct 5, 2008
    1,227
    568
    0
    Location:
    Paramount CA
    Vehicle:
    2021 Prius Prime
    Model:
    Limited
    In that case, another solution is:

    1. Charge the PHV battery to 80%. (It's better than 100% for PHV lithium-ion battery longevity.)
    2. Unplug the charger cable so that the 12 V battery doesn't quickly drain.
    3. Have the house sitter turn the car on to READY in the EV mode (which is the default mode) for half hour once a week. Note that READY must be displayed.

    The only caveat is that if the house sitter forgets the car on, this would be no good, with the ICE eventually kicking in and so on.
     
Loading...