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How to charge EVs is still a research priority. Currently, there are three main types of standard charging substations for electric cars: AC level 1 (slow charge), AC level 2 (fast charge) and DC fast charge. AC 1 level charging substation can provide a voltage of about 120 volts and a charging current of 12-20 amps, which is suitable for long-term charging of electric vehicles. Level 2 AC substations are for fast charging and reduced charging time, in which case the EV can be fully charged in 30 minutes.