Taycan Charging / EA 150kw vs 350kw

[daveo4EV]

once you're "below" 175 kW on the taper curve for the battery (about the 50-55% battery SOC point in the charge curve) - both 150 kW/350 kW charger are the "same" speed for the remaining duration of the charge session…

so the only "advantage" 270/350 kW charging can offer is the battery SOC range prior to the point where we're are at about 175 kW and decreasing…

50% is about 42 kWh

and to make the math even easier we'll assume you're starting from effective zero:

270 kW charge rate is 270 kWh for one hour of charge
42 / 270 = 0.155 or about 16%
16% of 60 minutes is 9.6 minutes to provide 42 kWh @ 270 kW

42 / 175 kW = .24 or about 24%
24% of 60 minutes = 14.4 or about 15 minutes

time to provide 42 kWh @ 270 kW = 9.6 minutes
time to provide 42 kWh @ 175 kW = 15 minutes

time saved for 270 kW vs. 175 kW = 15 - 9.6 or about 6.4 minutes - call it 6 1/2 minutes

basically 270 kW is only "faster" than 150 kW for the 1st 1/2 of the battery - after the battery is half full due to the charge rate taper curve you are effectively getting less than the "full" benefit of 270 kW charger because the vehicle is reducing the charge rate as the battery gets closer and closer to full…as the battery charge rate approaches 150 kW it equalizes the slower and faster charging stalls because while a charging stall can provide 270 kW charge rate - the vehicle can not accept that rate for the entire charging session.

the simplest model is: you get the "fast" rate for the 1st half of the session - and you get the "slower" rate for the 2nd 1/2 of the session

the maximum optimal ideal theoretical savings for 270 kW vs. 150 kW charging is 6.5 min for the 1st half of the charge session - after that 1st 1/2 the extra speed advantages diminishes for the 2nd half - and by 90% SOC you're charging at below 50 kW…regardless of which type of charging stall you have selected

math + fast-charge-taper-curve - means the difference between two operational ideal stalls - one at 350 kW and the other at 150 kW is about 8 minutes best case…to 90-95%…with the main advantage all being delivered in the first 42 kWh - after that point charge taper curve equalizes the performance of the two different speed stalls…

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[Eric]

so firstly - I'll apologize in advance if this question has been beaten to death - but I'm having trouble figuring something out.

I bought a 2022 Taycan (regular) about a year ago. not our first Porsche, but our first Taycan.

we've been pretty happy with it so far. it's my wife's car - and she really never drives more than 200 miles on a trip - so some 240v/50amp charging at home has worked out well so far.

we bought the car off the lot - as far as charging / battery tech - I see:

Performance Battery Plus (93.4kWh)
and
19.2kW On-Board Charger
and
On-Board 150kW/400V DC Charger

we're thinking of taking her car on a long trip in a few months. I did integrate Apple Maps with the car - which has been working great.

when plotting out my trip - I see that there were some filters for EA charging stations that did 350Kw, 150Kw, etc.

as I'll be stopping to kind of top off the battery while driving - and am fine with spending 20-25 minutes per stop - would it make a significant difference based on the car / my options to only stop at 350kw stations?

or in my situation - would the 150kw work great, and just be slightly slower than the 350kw?

Theoretically there is a difference between charging at 150Kwatts versus 350Kwatts however practically in my experience there is very little difference.Most of the time when I start charging at 350 Kwatt charger it starts out somewhere around 250 Kwatts but than quickly slows down to around 150 Kwatts versus when you use the 150 Kwatts charger it stays at that level much longer.The result is that the difference in charging time is minimal