在110v / 15amp下給Tesla Model 3充電的能源效率是否比在220v / 30amp下充電的能源效率低?


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我對伏特和安培有基本的了解。(伏特就像壓力,而安培就像那個壓力的帶寬。)因此,我想一想,充電是汽車電池組作為開放系統連接到電源的事件。這意味著該源將電子推向汽車電池,以抵抗向後推到電源上的汽車電池的應變。並且因此,實現充電意味著進入電池的壓力大於進入電池的壓力。到目前為止,這正確嗎?

所以這使我想知道:與在較短的時間內更強的220v推力相比,在更長的時間內從電源上施加更弱的110v推力,我會花費更多的"精力"(能量)來充電嗎??

此外,我了解到充電時效率只有90%左右,在此過程中,一些電能會因熱量(?)和...(還有其他東西)而流失。但是我不知道那90%的數字是否與電源電壓有關。

簡而言之:在更高電壓的電路上在家充電Model 3(在20%至80%的範圍內)是否更具成本效益?如果不是均勻的,除了憑經驗衡量,我們如何確定差異?

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Let's take a look at resistance!

With 220 volts, the resistance energy waste is R*(30 A)2. Charging power is 220 V * 30 A. So, resistance waste divided by charging power is R * (30 A) / (220 V).

With 110 volts, the fraction is R * (15 A) / (110 V).

Because 15 divided by 110 is the same as 30 divided by 220, if you are using the same cable, the power wasted to resistance is the same.

Now, if you could charge at 220 V and 15 A, you should be getting better efficiency with the high voltage.

However, this is just the cable resistance. The charger could be optimized for a particular voltage, as Chris H noted. It also could be optimized for a particular current.