Fast Charging Issues

[Jason M]

I am now on my second onboard charger in the past 16 months for my 2022 Taycan 4S. In the latest fix they changed to the 11kw from 22kW. I typically charge at home, but since my car was returned on Jan 5 I have needed to use a hyper charger while on the road (350-400kW). Each time the max charge input was 70kW, in many cases lower...always got 200+ before the car was returned. When I reached out to Porche to see is this is related to changing to the 11kW onboard charger they said yes, but I am getting conflicting messages online when I search on this topic. Can anyone advise if this is the issues, and if not what might be causing this. I am in the US.

Sponsored

 

[Tooney]

Most likely situation is that the charging rate was limited by the DC dispenser station you were using at the site. And/or, the HV battery temperature was low when you were charging and/or trying to charge at a high starting SoC.

Only way to tell is to ensure HV battery is pre-conditioned and at low SoC prior to charging, and try various DC dispensers and sites.

Normally bad OBC shows up as trouble with AC charging.

Good luck.

 

[Tooney]

An old thread on this subject: I ask and answer: Why won't my Taycan Charge as fast as I want it to?

 

[Jason M]

Thank you for the feedback.

Noted that the 11kW onboard charger should not impact using public DC chargers.

2 of the 3 times I charged, the battery was below 15% and today it was at 45%. Usually I notice the kW input decreases at 70-80% so would have expected it to start with much higher output to start.

2 of the days it was very cold here so it sounds like that might have limited the DC dispenser available output...today it was 65 degrees.

What is typically needed for the battery to be pre-conditioned. Each time I had driven the car at least 30 minutes...I would think that is enough to warm up the battery?

 

[SergeyIndy]

Driving the car for any period of time in cold weather or any weather will not warm up the battery to proper temperature for fast charging. I suspect like others that your battery is too cold to charge fast. The battery will pre-condition even if you are not even moving by the car if you properly point the car to a DC charger and you will start seeing battery temperature increasing right away. You need to be in a 95F degree battery temp and low SoC 15% or below to accept expected fast charging speeds. I have seen mine go as high as 295kW although the max is 270kW under optimal conditions.

 

[Jason M]

thank you!

 

[SergeyIndy]

thank you!

The trick that I use is to make your destination or area where there are fast chargers a Nav Favorite. Then you call out Charging Stations Near By via 3-dots and that guarantees that you are properly pointed to a charging station with battery pre-conditioning started, but you still need to watch your battery temp to be sure it is going up. The standard method is to locate your charging stations under the charging station icon in the Nav that is also shown in the images below.

 

[Jason M]

got ya. So this tells the car to start pre-conditioning while in route

 

[SergeyIndy]

got ya. So this tells the car to start pre-conditioning while in route

That is correct, if the charger is too close, then it can pre-condition even if you are standing as it is using its heating system to heat up the battery. However, if the charger is far away then it will not waste the energy to pre-condition until it is time to do so. I have seen it to start slowly pre-conditioning the battery when 30 min away from the charger. Try this out and let us know what peak speed you get. Then, we can talk about the benefit of Battery Friendly charging option, but for this test, make sure Battery Friendly charging option is not on, since first we want to be sure you are seeing high peak speeds close to 250kW plus at a fully operational charger.

 

[Jason M]

will do. I charged at home last night so when it drains down i will try this

 

[AtTheGlen]

I appreciate the comments on cold-weather charging. My wife and I moved from SoCal to upstate NY. I hadn't thought about preheating the battery and upon arrival at a charging station with the battery at about 24 degrees F, I was charging at about 9 kW. We're temporarily in a condo building that doesn't have charging capability, so we are going to an Electrify America charging station approximately 12 miles from our condo. Recently, when I put that destination into the PCM nav system for preheating, it showed 12 miles and about 71 minutes (it's an 18-minute trip). On this and previous occasions, the routing shows that we will bypass the charging station and get on the NYS Thruway (toll). It arbitrarily sends us east although perhaps there is a round trip built in to allow enough time to preheat the battery. (This is crazy.) On another occasion, it kept trying to stick with a route that was hugely out of the way and (again) on a toll road to the charger--perhaps to allow time for battery heating to 85+ degrees?

The SOC was about 28 or 30 percent, and if the system was set for "arrive at the charging station with at least 20%, perhaps it was taking us to another charging station, which is a bit too much decision-making on the nav's part. There was a message that popped up when entering the charger destination with the option to change a battery percentage. I attached a photo. I should research this on my own, but using the TaycanForum shortcut is too tempting!

I would value any information on what is happening when preheating the battery on the way to a charging station selected from the PCM menu. Thanks!

 

[Tooney]

@AtTheGlen In PCM: Home > Settings > Navigation > Charging planning.
See what values are set for minimum charge at destination and min. charge at charging stops.
That may help you figure it out. Good luck.

 

[AtTheGlen]

@Tooney Thank you for the lead re: "Charging Planning". It turns out that the "Minimum charge at destination" was set for 80%, which I think would suggest that the travel planner would not send me to a charger any farther away than would result in a charge less than 80%. That would be quite limiting! The console view shows 80% as the target charge (when not using the travel planner, it's at 85%). I cannot increase the 80% target once routing to a charger has started; however, I can continue charging past 80% if needed, e.g., because of a lack of chargers along the route that I'm taking. Acquaintances who are not yet EV adopters would probably say this is more complicated than filling up their gas tank. I guess I'd agree, but they are missing an exciting driving experience.

Sponsored