vagrantno13

回覆 328# PPLd

與其他電動車網站提供計算方式無異

EMSD 電動車輛的充電設施指引 P.12

vagrantno13

回覆

與香港電動車網站計算Kw 無差別

EMSD 電動車輛的充電設施 P.12

vagrantno13

回覆  328# PPLd

重覆回帖

PPLd

回覆  PPLd

與其他電動車網站提供計算方式無異
vagrantno13 發表於 2026-5-21 00:54

    Thansk. You just proved yourself using wrong numbers.
It clearly states the voltage is 380V for 3 phase instead of 220V.

vagrantno13

回覆 334# PPLd

The theoretical V value for three-phase operation differs from the actual V value provided by the environment. The reason for this discrepancy is assessed by the power company. Calculate kilowatts to approximate integers.

chpyeung

[deleted]

PPLd

I think you just prove yourself wrong ignorant! Do you realise that 220V is the RMS value of 380V ...
chpyeung 發表於 2026-5-21 12:39

   
220V is the RMS of 1-phase.
380V is the RMS of 3-phase.
So are we talking about RMS value or Peak value in calculation?

PPLd

回覆  PPLd

The theoretical V value for three-phase operation differs from the actual V value provi ...
vagrantno13 發表於 2026-5-21 09:00

The theory and actual are same.
3-phase is phase-to-phase and the vectors are 120 degrees off of each others.
It is exactly the reason why you get more power from same current.
Which part do you want to clarify?

chpyeung

晚上活動後嘗試到不用充值的充電場, 經過觀塘偉業街3間都爆場, 只能改去鴻圖道充電站充電(時間約晚上10時左近), 這間場標示DC 充電高達250kw, 實際充電時只有53kw, 聽場內司機講晚上鎖速. 今次是第一次晚上充電, 但體驗似急症室輪街症, 晚間電動車充電人數明顯多於日間(個人估計日間需要工作, 利用晚上時段預先充好.
Well done charge.jpg (53.97 KB)
vagrantno13 發表於 2026-5-21 00:48

可能背後總供電有限制, 多車同時充就會分薄啦.  計 kWh 的鎖你速佢係冇着數的. BTW 你要等幾耐?

chpyeung

回覆  billyyau

電動車在充電時電池發熱是正常的物理現象(不論AC 或DC 充電)，主要源於化學反應和電流通過內阻產生的熱量。雖然輕微溫升無礙，但過高的溫度會加速電池老化。現代電動車均配備電池管理系統（BMS）與主動式水冷/氣冷循環系統：充電散熱：若充電導致電池溫度過高，系統會自動降速或啟動冷卻，確保電池安全。
vagrantno13 發表於 2026-5-21 00:36

停車場仲要冇冷氣D空氣又相對唔流通, 氣温已經比街高. 夏天卅幾度加叉電, 冇主動冷卻的話想舊電唔過熱都難.