With the continuous increase of new energy vehicle ownership

Home charging as one of the main energy supplement scenarios

With the advantages of convenient charging and low electricity cost

Favored by new energy owners

At present, domestic charging piles on the market

The power is basically between 7kW and 21kW

"How to choose the power of household charging pile?"

"The more power, the better?" Wait

Many car owners are in trouble

Today, I will give you a good talk

How to choose a suitable household charging post~

01 End limit

Before we begin to talk about how to select the power of the household charging post, let's first understand the charging process of the household charging post. The so-called household charging pile generally refers to the small power AC charging pile. Its working principle is to charge the power battery after converting the AC power of the grid into DC power through the on-board charger at the vehicle end. The size of the power module of the on-board charger is directly related to the maximum charging power. New energy vehicle charging pile

The larger the volume of the on-board charger, the higher the cost, and at the same time, the space in the vehicle is relatively small. Therefore, many car enterprises will choose to use 7kW on-board charger, and some car enterprises even consider directly canceling the AC charging port to reduce costs and increase efficiency. Of course, there are also some models of automobile enterprises, and the maximum AC charging power can support 11kW and 21kW.

Therefore, it is not difficult to find that the power of the household charging pile is not randomly selected. The first thing to be noticed is whether the car end supports it.

02 Installation restrictions

In addition to paying attention to the power limit at the end of the car, the actual installation environment is also one of the aspects that need to be considered in the power selection of the household charging pile.

At present, there are two types of civil electricity in China: single-phase 220V and three-phase 380V:

The 7kW AC charging post needs to be connected to a single-phase ammeter (220V), with the rated current of 32A and the calculation method of 220V × 32A;

11kW AC charging post needs to be connected to a three-phase ammeter (380V), with the rated current of 16A and the calculation method of 220V × 16A × 3;

The 21kW AC charging pile needs to be connected to a three-phase ammeter (380V), with the rated current of 32A and the calculation method of 220V × 32A × 3;

One of the biggest obstacles for many new energy owners to install charging piles is that the residential area is not large enough to apply for independent meters, let alone three-phase meters. Therefore, although some models can support 11kW or even 21kW, only 7kW charging piles can be selected due to the installation site. Electric vehicle charging pile

In addition, it should be noted that if the on-board charger only supports single-phase electricity, even if the 11kW charging pole is installed, only about 3.5kW charging power (220V × 16A) can be obtained, but it is not as fast as the 7kW charging pole. It is not the higher the power is, the faster the charging is.

However, considering that many car owners may need to change cars in the future, and the power demand for charging will also become higher and higher. Conditional car owners can apply for three-phase meters, directly install 21kW charging piles, and downward compatible with more than 11kW, 7kW and 3.5kW power, suitable for almost all national standard models on the market. New energy vehicle maintenance Of course, three-phase ammeters and 21kW charging piles mean that the owner needs to pay higher costs for purchasing and installing piles.