The charging battle btw Big Brother 800V and little Sister 12V

[BigApple]

That would be an outrageous price for a lead-acid battery. Especially without the “discount” that was mentioned.

I cant imagine it is lithium .. don't they need ~16.8V charging. It seems the charging Porsche provides in the car never goes over 15V.

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[BigApple]

Here is the Power curve from the reader that is directly attached to the Battery
Pict 1 Shows when the battery is at a lower range. There is no indication that the cars Battery control module steps in to help when the charge goes low.

as you see at around 10.30am the car dies.
When i got back to the car a day later i had to add a boost charger to the battery. (see pic 2)

as you see at around 19.00 the boost kicked in and at around 20.30 i added a powered charger to the battery to charger it overnight.

I wonder what voltage an AGM battery needs to go below to be damaged/or no longer able to hold a charge the right way.
So from 20.30 to around 22.10 was the bulk charge. Then trickle charge kicked in. (Float)

All in all the car was not used (left alone) for 4 days and then battery died. given i now have a dashcam so there is an additional draw. But it is shocking that the car does not maintain its 12V battery. A simple programming algorithm should fix this i would imagine.
Note: the first time it died after 4 days i did not have a dashcam so no extra draw. And it died after around the same time. .
Solution: The Battery module should be set to charge the batterie when it reaches below a certain voltage.
And if that is such a earth shacking new idea than at least add a feature to the Remote app and let us have an on or off timer/toggle to charge the cars 12V battery. This should be easily doable as we already have that feature. The only difference would be that no extra power would be wasted to the heating/cooling system. It would allow the power where it needs to go for such function.
Currently for me to charge the battery remotely i have to run the cooling/heating and trigger it through a timer or manually. What a waste of energy just to charge the battery when you are away.
And if it wasn't for my Black Vue dashcam i wouldn't even know remotely what the SoC for my 12V is. Porsche does not give you such a readout in its app. Clearly not important to them.
To me : A dead car is a dead car no matter what battery died.

 

[Scandinavian]

If the Suncoast battery is the correct one, it has a capacity of 62 Ah. That is quite lot for an EV I think. There is no starter motor to pull. Just normal supply for lights, fans, pumps etc.

From you graph you seem to have a high draw on the battery constantly. That does not look normal. Could you not disconnect your dash cam to view and eliminate the draw from that? Do you have any graph earlier that the ones shown?

I think a visit to a competent Porsche service is required? There has to be something that is taking power all the time.

 

[BigApple]

If the Suncoast battery is the correct one, it has a capacity of 62 Ah. That is quite lot for an EV I think. There is no starter motor to pull. Just normal supply for lights, fans, pumps etc.

From you graph you seem to have a high draw on the battery constantly. That does not look normal. Could you not disconnect your dash cam to view and eliminate the draw from that? Do you have any graph earlier that the ones shown?

I think a visit to a competent Porsche service is required? There has to be something that is taking power all the time.

They had my car for 1 week and determined that it was a bad battery. They went back and forth with porsche.
I am actually more concerned about that the car does not maintain the 12v battery. Draw or not.

 

[alxman]

I have Apex protect GPS which was provided by Porsche, complimentary. It monitors the 12v battery and you can set an alert to notify you if the voltage is below a certain range. By default is set at 11v, but you can change that to another number such as 12v. I’m away from home for a week and checked the battery voltage and it was 12.4v. I turned on Pre-climate and after a few minutes it was 14.6v. Just for that reason I may be inclined to renew the subscription once the complimentary period ends…

 

[Scandinavian]

They had my car for 1 week and determined that it was a bad battery. They went back and forth with porsche.
I am actually more concerned about that the car does not maintain the 12v battery. Draw or not.

Now I do not have a Macan yet, but have a Taycan. I have had 12 volt trouble there as well when leaving the car at the airport. It had drained the 12 volt battery while we were away on holiday. For a number of reasons the period got extended to more than 8 weeks and the battery was disconnected. That has not happened since though and we have left the car at home or other places for more than 6 weeks at a time and all has been fine. For Taycan it earlier was stated that the cycle count for charging the 12 volt battery when parked long term was set to max 8 cycles. Later software is said to have addressed this, but I am unsure how? Normally the 12 volt battery holds up very well considering the capacity in the Taycan is only about 40 Ah.

The Porsche design should most likely have been transferred in principle to the Macan and since there are so few reports of 12 volt problems, there likely is something strange in your car. How experienced is your dealer with Porsche EV’s?

 

[BigApple]

Now I do not have a Macan yet, but have a Taycan. I have had 12 volt trouble there as well when leaving the car at the airport. It had drained the 12 volt battery while we were away on holiday. For a number of reasons the period got extended to more than 8 weeks and the battery was disconnected. That has not happened since though and we have left the car at home or other places for more than 6 weeks at a time and all has been fine. For Taycan it earlier was stated that the cycle count for charging the 12 volt battery when parked long term was set to max 8 cycles. Later software is said to have addressed this, but I am unsure how? Normally the 12 volt battery holds up very well considering the capacity in the Taycan is only about 40 Ah.

The Porsche design should most likely have been transferred in principle to the Macan and since there are so few reports of 12 volt problems, there likely is something strange in your car. How experienced is your dealer with Porsche EV’s?

The first time they have determined that there was no parasitic draw then. But I wonder if they tested if there is no charge or maintaining the battery either within the car. Not sure if they tested that. Or there even is such a thing. Right now to get around this I run the heater 2-3 times a day to give the battery a boost to maintain it. What a waste of energy.

 

[PrudentOcean]

I had my car wrapped in PPF and ceramic coated recently, including the wheels, calipers, glass and leather interior. The whole process took nine days to allow drying etc.

The car was never driven during this time (the wheels were off) and the doors open and windows rolled down.

With the doors open the door and interior lights would have been on. I’m not sure if operational readyness was established, that would have depended on how far away the key was. I did check on the car several times per day to see which doors and windows were open.

I think this would have drained the 12V battery if the car didn’t recharge it from the High Voltage battery. The HV battery lost a couple of percent of charge during this time.

 

[BigApple]

I know the car gets charged when it is turned on. But I never tested what the minimum turn on is for it to provide power to the battery. Maybe worth Ido some more testing. This would ofcourse not fix normal day to day use.

 

[PrudentOcean]

But normal day to day use also shouldn’t be a problem unless the 12V battery is defective.

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