Scheduled Charging End Time

166

Description

In addition to the current start time, have the option of an end charging time.

Competitive/Pricing/Notes

In many areas, there are ‘peak and low’ energy rates. For example, it means that between 11 pm and 7 am you pay a far lower rate than during other hours (peak/high rate).

It would be very helpful (and a money saver) if one could not only set a start time (possible now) but also set an END TIME for scheduled charging.

Such a feature might include a lower SOC (State Of Charge) limit as well so that the stop time is ignored until you get the minimum level of charge

Status

Unknown.

(voting combined from a close duplicate that has been removed)

lightly edited by moderator
Category: Y3XS Applies to:
Tags:
     Created 2-Jan-2014

25 Comments

In AZ both APS & SRP have TOU rates that offer super off peak times next to on peak times. Would like to be able to charge during those narrow times and would need a stop charging time.
    Created 2-Sep-2020
Full dayly schedule, weekdays and weekends would be also nice, But  simple way to start time and end time, even manually everyday, is fundamental for the electrical tariffs fares we are used in Europe. Nowadays you have even very low cost from 1-7am, while you pay 3-5 times more outside that slot.

Depending on the KWs you have allowed to charge (e.g. modest apartment can have 4,5KW) and you limit to 13-16A (or 3.7KW) the battery won't finish charging, but you will just maximize everyday's tariff.

If you need to fully charge up to a certain 90%, you just eliminate the end time, or as suggested leave a lower SoC (separate to the current standard limit)
    Created 30-Mar-2019
But  simple way to start time and end time, even manually everyday, is fundamental for the electrical tariffs fares we are used in Europe. Nowadays you have even very low cost from 1-7am, while you pay 3-5 times more outside that slot.

Depending on the KWs you have allowed to charge (e.g. modest apartment can have 4,5KW) and you limit to 13-16A (or 3.7KW) the battery won't finish charging, but you will just maximize everyday's tariff.

If you need to fully charge up to a certain 90%, you just eliminate the end time, or as suggested leave a lower SoC (seoarate to the current standard limit)
    Created 30-Mar-2019
Yes, charging at a higher kW rate IS more efficient... up to a point.  On our 2015 Tesla Model S P85D our 2st generation Tesla High Power Wall Charger ("HPWC") cable, HPWC plug and the Tesla charge port all get quite a bit hotter charging at 80A / 240V (19.2kW) than our normal 40A / 240V (14.4kW) charge rate.  Heat = Energy Loss = Less Efficient.... Plus heat is the #1 enemy of electronics and plastics lives.  We charge at 60A since it is definitely better for our 100A circuit breaker, HPWC cable, HPWC plug, Tesla charge port, and Tesla dual onboard 40A AC -> DC chargers.

And yes, charging at 32A / 240V (7.7kW) is definitely not going to harm the batteries in any way.  Repeated Supercharging and/or charging to 100% however will.
    Created 11-Dec-2018
Is there a source for the claim that charging more slowly is more efficient? I've read exactly the opposite. Whenever the car is charging, it has to run its battery coolant circulator pump, its inverter for the 12V systems, and potentially heat or cool the battery packs to keep them in the optimal temperature range for charging. All of that consumes energy. By charging for less time (i.e., at a higher rate), you run all those auxiliary systems less and consume less energy.

Besides, the car can supercharge at many times the rate of its on-board AC charger at max current. I really do not believe 32A at 240V (7.68 kW) is going to harm the batteries in any way.
    Created 11-Dec-2018
I'll second what Charles said. I'd like to be able to "back load" the charging period so that charging concludes at my chosen time. My reason for wanting this is so that the battery packs are still warm when I start to drive.
    Created 11-Dec-2018
Not sure of this is the right place for this, but I'd like a "finish charging at" setting, and have the car figure out when to start to be done at a set time.
    Created 2-Dec-2018
My Volt has this, and I miss it on my 3.  It would also help to skip or limit any morning preconditioning since everything should be warm and comfy from the recent charging.  This entry looks like it's asking for a similar feature.
    Created 27-Sep-2018
Would be very useful for those of us on a time-of-use power plan but with only a 120v charging outlet.

It could also be more friendly to the power grid if the car determined how long it was going to take to charge and picked a start time right in the middle of that window.  This would avoid me and all my neighbors creating a huge draw right at 11pm when power gets cheap.  Probably not a big deal most places, but around the San Francisco bay area the Teslas density is quite high.
    Created 22-Sep-2017
Yes, for being able to let the car compute the charge start time so it completes when I'm scheduled to leave.

It could adjust the charge rate, I don't mind.
    Created 9-Nov-2016
This would be too easy for Tesla to add, and remains a puzzle why people are stuck paying on-peak rates, or going back into their cars to set for TOU charging on weekends.  It is an instance where one isn't graduating to a Tesla, but descending from what just about any other EV offers.  It goes against the effort to make automation their brand.
    Created 2-Nov-2016
My car already has this (2016 S90D). I thought it was standard.
    Created 1-Aug-2016
Vern
-13
Please look at the VOLT 1.0 scheduled charging feature and do something like it.
If I want to range charge I prefer to have the car reach range just before I leave the charger, not hours before.
    Created 30-May-2016
It will also allow owners to use one 50Amp circuit with two EVs by reliably staggering their charging times. Such a circuit can only support one car at a time at full capacity and it won't be long before many households get their second EV. Scheduled stop times avoid guesswork, mistakes, possible tripped breakers or - worse - a fire.
    Created 2-Jan-2016
As most users have noted, our batteries appreciate long and sloooow charge times.
This car has the very best logic ever seen in a car! So, why can't we have a user's definable end time?
Since we are told to leave the car plugged up all the time, it should know when to start charging. If I tell the car to always have this charging finished by xx:xx.
If you need to have a certain time period in which to charge, (for reasonable rates), put in your start time and let the car determine if it Can,, finish by xx:xx. Based on your amp setting and the hours available to charge, the car will "know", if it is doable. You can then adjust your beginning and or end time if needed.
    Created 28-Dec-2015
I no longer use my UMC at 40A because the cable heat and reports of fires made me nervous. But it's quite slow at 30 or 32A, so I normally charge at 36A, but it would be great if I could automatically use as little amperage as I needed to get to the desired SOC within the super off peak time period.
    Created 1-Nov-2015
I'm in, makes life really easy.
    Created 22-Oct-2015
Charging at lower amperage rates is definitely more energy efficient since less heat is lost charging at lower rates.  Just feel how hot a High Power Wall Connector connector, cable, etc. gets at 80A charge vs. recharging at 15A.  HUGE difference there plus the Tesla batteries and on-board chargers need more cooling too.

Battery life is definitely supposed to be longer using lower charge rates... Hence the Tesla recommendation to use SuperChargers sparingly for longest battery life.
    Created 2-Sep-2015
This might be useful in areas that have time-of-day electricity rates, but doesn't add value in places that have the same rates no matter what time it is.
    Created 2-Sep-2015
I have TOU charging with SCE in Southern California.  my Super Off Peak is 10pm to 6am.   I would like to have the MS stop at 6am if the charge is not complete as we as a override to this as well.     The rest of the charge to 90% could be caught up on subsequent days.

These capabilities need to be accessible from the remote app as well.
    Created 20-Jul-2015