Navigation charging recommendations - oddities

[tylerdurden]

So I'm driving home with navigation on. The charge is low an Im going to arrive home with about 5% left. No big deal. I have a home charger. So I am not worried.

However, the nav system is directing me to a commercial charger close to home to top up for a few minutes to reach the 22%min target for destination.

Its not really considering my charger at home.

So overall - feels like the system has been overthought.

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[allroadusa]

If you set the minimum charge at destination to 22%, the Nav system will seek for a charger to reach that level arriving home. Set it to 4% when destination is home and you’ll be okay.

 

[JAGMAN]

Yup, what he said. Overall I like the PCM nav system, but every once in a while the Intelligent Range Manager does some strange things and I have to turn it off. A recent example that shares your experience, on a long drive home of 265 miles, the system wanted me to stop to recharge about an hour from home. I have minimum charge at destination set to 10%. I was showing 5% upon arrival at home without charging. I decided to skip the charging stop. Here’s the catch, I wanted the nav system active so I could monitor range, but I did NOT want the system to preheat the battery for a charging stop I wasn’t going to make. I had to deactivate the range manager to do this. I arrived home with 7% and was driving very inefficiently.

Another example that happens when DC fast charging, the range manager stops the charging process because it thinks you have enough juice to make it to the destination. The trouble with this approach is that it assumes the presence of a destination charger which is not always available. Without a destination charge I like to charge well beyond the target charge so I can make it to a charger on the way back from my destination.

 

[tylerdurden]

interesting. Very valid point about an inappropriate charging recommendation resulting in wasting power preconditioning a battery unnecessarily.

I didnt realise there was an intelligent range manager I could turn off.

How do you do that then?

 

[Tooney]

Another example that happens when DC fast charging, the range manager stops the charging process because it thinks you have enough juice to make it to the destination. The trouble with this approach is that it assumes the presence of a destination charger which is not always available. Without a destination charge I like to charge well beyond the target charge so I can make it to a charger on the way back from my destination.

The way to avoid the Porsche charging planner from overriding the charge you want is, prior to starting a charging session, delete the destination in the nav unit. If there is an active destination in the nav unit and the Porsche charging planner is active, the charging planner will control the amount of charge received. When this occurs, you will see a message: Porsche charging planner is active.

 

[Tooney]

interesting. Very valid point about an inappropriate charging recommendation resulting in wasting power preconditioning a battery unnecessarily.

I didnt realise there was an intelligent range manager I could turn off.

How do you do that then?

in PCM: home.... navigation... <. . .>.... charge planning ... uncheck Porsche charging planner

 

[JAGMAN]

The way to avoid the Porsche charging planner from overriding the charge you want is, prior to starting a charging session, delete the destination in the nav unit. If there is an active destination in the nav unit and the Porsche charging planner is active, the charging planner will control the amount of charge received. When this occurs, you will see a message: Porsche charging planner is active.

Sometimes I like to know what the state of charge will be at the destination. Charging with an active destination will do that. That way I can add a buffer on top of the bare minimum. I suppose I could delete the destination and do simple math. 1st world problem I suppose.

 

[Tooney]

I don't know when/how the charging planner decides to stop additional charging. The only times I have seen charging stop with "Charging planner is active" is when I was AC charging to a high SOC at home (with a destination in nav unit). I've never seen it stop DC charging on a road trip.

 

[Murph7355]

....
So overall - feels like the system has been overthought.

Agree with this. It seems unnecessarily complex and prone to one choice overriding another.

Just got my home charger up and running....

Think I followed the video posted elsewhere showing how this works...

General profile set to put up to 85% in it...and to charge 0000 to 0700 out of preference...

Plug it in (1900) and it's merrily charging away straight away. (75% charged and 6.4kW charging...so no need for it to be on now!?).

It preheated correctly this morning. But seems to be ignoring timing preferences.

Will do more digging, but do timers and profiles need to be split out this way?

 

[Hirschaj]

Agree with this. It seems unnecessarily complex and prone to one choice overriding another.

Just got my home charger up and running....

Think I followed the video posted elsewhere showing how this works...

General profile set to put up to 85% in it...and to charge 0000 to 0700 out of preference...

Plug it in (1900) and it's merrily charging away straight away. (75% charged and 6.4kW charging...so no need for it to be on now!?).

It preheated correctly this morning. But seems to be ignoring timing preferences.

Will do more digging, but do timers and profiles need to be split out this way?

Don’t try to use a time preference within a profile. (That is for people that have a home energy manager) Use a timer and profile together. I have my profile set to 40% and my timer set to 85% at 6AM every day. Works like a champ.

 

[Murph7355]

Don’t try to use a time preference within a profile. (That is for people that have a home energy manager) Use a timer and profile together. I have my profile set to 40% and my timer set to 85% at 6AM every day. Works like a champ.

I thought the time preference was to get the car to charge at preferred times, e.g. when electricity is cheapest.

From the video I watched, the idea being that the car knows how much charge you want, can calculate how long that will take with the charger plugged in, and then does as much as it can in the specified time.

 

[CaliPorsche]

I thought the time preference was to get the car to charge at preferred times, e.g. when electricity is cheapest.

From the video I watched, the idea being that the car knows how much charge you want, can calculate how long that will take with the charger plugged in, and then does as much as it can in the specified time.

I am a relative newbie to this and I am deliberately over simplifying - and there are also a gazillion posts/arguments on here covering this extensively - but here are effectively the four things to think about, :-

• Battery Minimum Charge - what you want the lower limit of your car battery to be charged to when you plug in - regardless of anything else that follows here - this will override a timer setting and charge to this set point when you plug in the car and the battery SoC is below it. In other words this is the lowest charge you ever want your battery to be at when it is plugged in.
• Battery Target Maximum Charge - the upper charge SoC you want the car to be charged to for that location or in general - and set in a Profile - if there are no timers set this will start to charge immediately. You usually would want to set this at 85% to lengthen battery performance life, and set higher when going on a longer trip.
• Battery Charge By Timer - when you set this to a certain time (6.00am) - regardless of when you plug in the charger - this will only start charging when it needs to in order to FINISH charging to your set Target Maximum Charge at 6.00am. Of course when it starts charging all depends on the SoC when you plug the car in and the charger capacity. For most people they simply rely on this with a Profile for Target Maximum Charge rate to only be charging in the lower cost TOU windows your utility is providing.
• Preferred Charge Times - this is where you can set your preferred charge start and end times so that the car will usually start charging only in these windows when you plug it in. Note that if the car is under the Minimum Charge Setting (if set) when you plug it in this setting will be overridden, and if you have set a Charge By Time and there is not enough time in your window it will also be overridden. This is only useful IMHO if you have a really steep differential and a narrow charge window for the low rate. I agree with the poster above in setting a target charge by time being easier.

https://www.taycanforum.com/forum/threads/taycan-charging-quick-reference-profiles-and-timers.6799/

 

[Hirschaj]

I thought the time preference was to get the car to charge at preferred times, e.g. when electricity is cheapest

Nope, you need to use a profile and a timer together to get something resembling the behavior you are looking for. It’s been covered a lot in this forum. It’s not intuitive at all.

 

[Murph7355]

Thanks both. Will take a further look.

 

[Murph7355]

OK, I think you both helped me get on top of this (for now)

• Have set a "General" profile to have a minimum charge of 25%. I figure this will get me 40-60 miles, and would be the typical "emergency dash" maximum range I would need
  • I've set preferred charging times as 0000-0700, which is when I get cheaper electricity. (I'll run the car to less than 25% at some point to see if that does its job)
• Have set a timer to have the car charge to 85% and preheated by 0900 tomorrow.
  • Will be interesting to see what time that comes on
  • The battery is currently at 53%
  • The charger pulls 6.4kW
  • So I reckon it should start somewhere around 0300-0400
  • Car charge light is currently flashing blue, and the Porsche charger a light greenish/yellow colour. So all looks to be working as planned.
• Have also set a bunch of other timers for typical times I need to leave during the week.
  • Will see if I remember to choose them!
  • Would be nice to be able to name them, but no big deal

Assuming that lot works as intended, I'll have a further play with it (geo-located profile, charge %ages etc etc).

Appreciate the input guys.

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