Scheduled charging END time?

[mpshizzle]

It's fairly well known that limiting the time your battery spends at high states of charge is best for battery health (thus the 70% daily limit).

When I go on a road trip I try to take that into account and set the vehicle to finish charging within an hour of my intended departure time.

The only real way I've found to do that, though, is to just play with the charging rate and watch the estimated time remaining. But there's GOT to be a better way to do that.

My utility doesn't implement time of use so I can charge whenever I want. But I would love for there to be an automated way to delay charging so that it finishes just before I leave

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[No_Name5330]

I’ve found myself wanting this very thing every time i go on a trip.

 

[mudito]

Not sure if the same, but you can set a "daily Schedule" with an start and stop time. Since I have ToU Electricity, I have it set from 8pm to 6am, so it'll only charge to the limit set within that timeframe.

If you have a 48A L2 (roughly 11kWh charging) for a large pack that's roughly 10% per hour. If you need to charge 50%, then you would set a start time about 5hrs before your departure and you should be set.

 

[Riviot]

 

[Treebeard]

It's fairly well known that limiting the time your battery spends at high states of charge is best for battery health (thus the 70% daily limit).

When I go on a road trip I try to take that into account and set the vehicle to finish charging within an hour of my intended departure time.

The only real way I've found to do that, though, is to just play with the charging rate and watch the estimated time remaining. But there's GOT to be a better way to do that.

My utility doesn't implement time of use so I can charge whenever I want. But I would love for there to be an automated way to delay charging so that it finishes just before I leave

You can set start and stop time and SOC. Why does it need to stop charging one hour before you leave? Tell it to charge, tell it what time you want it warmed up or cooled to leave and you are good to go. Or are you trying to avoid being charged for idle time at the charger?

 

[gregeast]

Agreed, I've wished for this every time I charge for a road trip.

 

[Dark-Fx]

Change your charge rate down so it finishes when you want it to. Only way to do it currently.

 

[Donald Stanfield]

I do the same math method and shoot for around an hour before myself. I don't think there is another way to do it.

 

[mpshizzle]

You can set start and stop time and SOC. Why does it need to stop charging one hour before you leave? Tell it to charge, tell it what time you want it warmed up or cooled to leave and you are good to go. Or are you trying to avoid being charged for idle time at the charger?

What I'm trying to avoid is having the battery just sitting at 100% for long periods of time. That's hard on battery longevity. So the ideal is to have it hit 100% just before you start driving

 

[beatle]

"Long periods of time" is a day or longer. If it's at 100% for a few hours, nothing bad will happen.

 

[mudito]

"Long periods of time" is a day or longer. If it's at 100% for a few hours, nothing bad will happen.

This

What I'm trying to avoid is having the battery just sitting at 100% for long periods of time. That's hard on battery longevity. So the ideal is to have it hit 100% just before you start driving

But if you still want to be at 100% minutes before driving, Like I said before, you can do a bit of math and adjust the schedule accordingly and It'll be perfect.

i.e.: My truck currently is sitting like this:

I have a 48A charger that is roughly to 11kWh of charging. If I want to be at 100% by 8AM, I need 48kWh, which translates to 4hrs:20mins of charge (I'm rounding up math here). So I would set a schedule to start at 3:30am and to finish at 8am.


And... to be honest, I would not do that. If there's a power outage while I'm sleeping, that throws my strategy out of the window... I'd rather have the truck sitting at 100% for a few hours to be safe

 

[Treebeard]

What I'm trying to avoid is having the battery just sitting at 100% for long periods of time. That's hard on battery longevity. So the ideal is to have it hit 100% just before you start driving

All the training I’ve had about batteries is that it’s better to maintain at a SOC, regardless of level. A few hours at 100% won’t hurt anything. It’s the number of times and how fast you get there. Level III chargers are hard on the battery because they are forcing so much power at one time. Slow chargers are not hurting your battery.

 

[mpshizzle]

I guess I do get a little carried away with the "not staying at 100%". Definitely worse things than a few hours haha. Even still, I would love to have timing controls like that

 

[mudito]

I guess I do get a little carried away with the "not staying at 100%". Definitely worse things than a few hours haha. Even still, I would love to have timing controls like that

I was actually thinking about this thread moments ago. As I was driving out from my garage, saw my wfe's Tesla Model 3 plugged in still. She charged it on Saturday night to 100% and stayed there until today and she does this almost weekly (charging to 100% and leaving it there for when she needs to drive). Basically, she treats it like a fuel tank

It has been 2 years and 34k miles, and battery health is at 95% today.

I guess I'm trying to say that we "care too much", maybe (and I kind of include myself in this sentence). ;-)

 

[Dark-Fx]

And... to be honest, I would not do that. If there's a power outage while I'm sleeping, that throws my strategy out of the window... I'd rather have the truck sitting at 100% for a few hours to be safe

I'd like to see a configurable ASAP charge level, as well as departure based charging. Would eliminate my daily concerns and allow me to keep as much heat in the pack as is reasonable for the winter time.

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