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Porsche Taycan – Power Hungry, Slow to Charge Than Tesla Model S (Most of the Time)




Cars
 All rights to Simon Barke / CT

Published on September 5, 2019 |
by Guest Contributor

5. September 2019 by Guest Contributor


By Simon Barke

After the unveiling of the new Porsche Taycan yesterday, analysts [19659009] were quickly out calling the only electric competitor (Tesla Model S) "ancient in comparison", pointing out the "groundbreaking" 800 volt system that "reduces charging times." you can feed more power to the battery without increasing the charging current. But how good is Porsche's implementation?

Efficiency

To reduce the charging times for electric cars, you can either increase the maximum charging power or make the car more efficient. Preferably do both. Unfortunately, the Volkswagen Group has a somewhat troubled history with efficient vehicles. It recently decided a lawsuit after it was revealed that Audi, Bentley, Porsche and Volkswagen vehicles contained illegal cheating software to exaggerate the effectiveness of test stands. Audi e-tron is still one of the least efficient electric cars on the market. The new Porsche does not fare much better. If in fact, it goes far worse.

Based on the European WLTP test cycle, the Taycan “Turbo S” requires 111 kWh to recharge the battery, giving a total range of 256 miles. That's 2.3 miles per kWh, worse than e-tron's 2.6 miles per kWh. Compare that to the Tesla Model S “Performance” with a WLTP efficiency of 3.3 miles per kWh and you see how efficient large electric sports sedans can be. The Model S is even faster than the high end Taycan, while the Taycan “Turbo” is only marginally faster than the Tesla Model 3 “Performance”, a car as efficient as 3.7 miles per kWh. (Fun fact: Model 3 “Performance” causes 40% less CO2 equivalents during electricity production than Taycan “Turbo S.”.

  All rights to Simon Barke / CT "srcset =" https: // cleantechnica. Com / files / 2019/09 / taycan-07.png 4306w, https://cleantechnica.com/files/2019/09/taycan-07-270x167.png 270w, https://cleantechnica.com/files/2019/9/taycan- 07-768x475.png 768w, https://cleantechnica.com/files/2019/09/taycan-07-570x353.png 570w "sizes =" (max width: 4306px) 100vw, 4306px

Power

Bad As a countermeasure, Porsche implemented an 800-volt system that can handle impressive charging power of up to 270 kW. The "5 to 80% in 22.5 minutes" charging time can only be explained if Taycan manages to maintain 270 kW for at least half the charging cycle, we can use this information to estimate an idealized charging profile under optimal conditions. When charging profiles, the advantage of the 800-volt system becomes visible: Model S can only maintain its maximum rating of 200 kW for the first 20-30% of the charging cycle. The same is true for the Model 3's 250 kW charging power. (Tesla profiles are idealized curves from real-world data taken during Supercharger V3 beta testing and may have improved slightly since then.)

 All rights to Simon Barke / CT "srcset =" https: //cleantechnica.com/files/2019/09/taycan-04.png 4306w, https://cleantechnica.com/files/2019/09/taycan-04-270x167.png 270w, https: // cleantechnica. com /files/2019/09/taycan-04-768x475.png 768w, https://cleantechnica.com/files/2019/09/taycan-04-570x353.png 570w "sizes =" (max width: 4306px) 100vw , 4306px

Remember that only a handful of DC fast chargers can provide such high power. In the United States, ten 250 kW Supercharger V3 stations are available or under construction, while all other 690 stations are still limited to 150 kW, but may be upgraded in the future. Although the general charging infrastructure for Taycan is not as good yet, there are far more stations that support full charging power. 229 Electrify America locations that can deliver up to 350 kW are in operation today, and 71 more are scheduled by the end of the year.

Speed ​​

Once you know how efficient a car is, you can translate the charging power (kWh) to charge speed (miles of range added per hour of charging). At the same time, you can scale the battery charge state (%) to the vehicle area (miles) when you know the total range. If you do, you will see that Taycan's poor efficiency and short range removes the benefits of charging power. It's just a small area where Taycan comes out on top. Model S is faster during most of the charging cycle. Not surprisingly, the Model 3 Taycan completely dominates.

Time

It is difficult to calculate actual charging times. Essentially, you need to integrate the inverse of the charging speed (time it takes to add range) over a certain range of intervals. If the battery is nearly full, the time required to add more range increases significantly. For that reason, most manufacturers give the time it takes to charge the battery to 80% or similar. However, if you want to compare different cars, we need to calculate the time it takes to add range. Let's say you go up to the charger with 20 mile range left. How long does it take you to add 80, 130, 180 or 230 miles?

While Model 3 is arguably the fastest charged electric car available to date, Taycan “Turbo S” and Model S “Performance” are actually head to head in terms of charging time – up to the 200 mile mark . While the Model S continues to add more range at high speed, Taycan is rapidly dropping. This is no surprise: After 230 miles of range added, the Porsche charging state reaches 97% and the charging speed comes to a crawl. Tesla's battery provides the same range of just 67% charge mode and can therefore receive more energy much faster.

Notes on the assumptions: All figures are based on the European WLTP test cycle and idealized charging forces under optimal conditions. All charging profiles are simplified models. Taycan's charge rates are estimates based on specified charging times. Model S and Model 3 loading rates are based on early Supercharger V3 beta testing. Tesla was unable to provide official sight profiles. Porsche did not respond to a request.

Conclusion

If the Volkswagen Group wants to remain competitive, it must start to care about its efficiency. High-voltage systems and sophisticated charging profiles are temporary solutions that not only result in more expensive cars, but also higher emissions. Is there any hope? Yes. It is believed that the upcoming VW ID.3 may actually be a very efficient car. Will Porsche Taycan be Volkswagen's latest failure against a cleaner future?


Tags: CO2 emissions, Electrify America, EU, Porsche, Porsche Taycan, Tesla, Tesla Model 3, Tesla Model 3 performance, Tesla Model S, Tesla Model S Performance, Tesla Supercharging, UK, US [19659030] About the Author

Guest contributors are many, many people. We publish a number of guest posts from experts in a wide variety of fields. This is our contributor account for the special people. : D





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