Take precautions and forecast the electricity demand of electric vehicle charging piles

Before installing an electric vehicle (EV) charging station, whether you are an electric vehicle owner or a professional who is responsible for installing charging stations for customers or employees, you need to consider the power requirements for powering the charging station or electric vehicle charging station (EVSE). Installing an electric car charging system will significantly change your electricity needs. In order to clearly illustrate this problem, Christoper Michelbacker, Audi’s electric vehicle charging and infrastructure manager, gave an example of an ordinary house.

Author: David Talbott

Before installing an electric vehicle (EV) charging station, whether you are an electric vehicle owner or a professional who is responsible for installing charging stations for customers or employees, you need to consider the power requirements for powering the charging station or electric vehicle charging station (EVSE). Installing an electric car charging system will significantly change your electricity needs. In order to clearly illustrate this problem, Christoper Michelbacker, Audi’s electric vehicle charging and infrastructure manager, gave an example of an ordinary house. “The daily electricity load of an ordinary family is about 5kW, so adding a 9.6kW charging pile is likely to double the electricity load of this family.” Then, how to predict the electricity demand of household and commercial electric vehicle charging piles Woolen cloth?

Determine your power needs

To understand whether your house or building can withstand this increased load, you must first ask an electrician to conduct an electricity load assessment to determine whether the current power supply capacity is sufficient. The key factors include:

・ Calculated building electricity load
・ Current power supply capacity
・ Expected load of EVSE

Planning the installation of household charging piles

At present, most of the charging piles installed in residential buildings are Class 2 charging piles and require a 240VAC power supply circuit. The typical level 2 charging pile has a power of 7.2kW and a working current of 30A. Electrical specifications require that the power supply capacity of the circuit is 20% higher than the expected load, so the installation of this charging pile requires a dedicated 240V, 40A power supply circuit. The working current of the 9.6kW Class 2 charging pile is 40A, which requires a 50A power supply circuit. The maximum output power of the 2-level charging pile is 19.2kW, the working current is 80A, and a 100A power supply circuit is required. If other services are needed to support EVSE, then additional meters and switchboards may be required. Other considerations for residential installation include:

・ Is the charging station hard-wired or plug-in?
・ Where will the charging station be installed?
・ How should I deliver electricity from the distribution board to the charging pile?

Planning the installation of commercial charging piles

To deploy a more robust charging solution, companies also need to assess the building’s electrical load to determine whether the current electrical services can be supported, and there are other considerations. For example, if the charging solution involves multiple 2-level charging piles, the calculation method is similar to that of household charging piles, multiplying the number of charging piles by their output capacity (current and power). Commercial installations may require multiple dedicated 240V power supply circuits, and the total load may increase significantly relative to the base load of the building. The DC fast charging charging pile requires a voltage of 480V, and depending ON its output power, a large current may be required. Most commercial buildings have 480VAC circuits, which can be divided into 240V branch circuits. The DC fast charge charging pile requires a dedicated 480V circuit.

For commercial buildings, there is another important consideration. That is, it is necessary to accurately calculate the basic load of this building in order to negotiate commercial electricity prices that fluctuate with demand. Michelbacher explained this issue in detail. “Usually, commercial electricity prices are negotiated and determined based on electricity demand. The so-called electricity demand is the expected peak load during operation. Users will pay for the actual electricity consumption (kWh) at this electricity price. If your electricity consumption exceeds The demand threshold is to pay according to the new demand electricity price, which is much higher than the original price. Now we assume that the base load of the building is 40kW. Ideally, you want to negotiate a price that matches your actual electricity consumption as much as possible If your normal use power is 20kW, you don’t want to negotiate a 100kW power demand threshold, because you will have to pay for the unused power. Now let’s suppose you get the negotiation based on the 40kW building’s power load Electricity price, and a 50kW fast charging charging pile is installed. The building is operating normally at 40kW, and suddenly someone starts to charge the car with the charging pile. During the charging period, the energy consumption of the building is 90kW. Once it is exceeded The threshold of 40kW starts to calculate the electricity price based on the demand price. Although the demand price varies with the region and the power company, the charge per kilowatt hour may be very high and will be added to the commercial electricity price you negotiate. Once the demand price is reached When it is started, the electricity price will continue to be used in the following electricity cycle, even if the actual electricity consumption is lower than the demand threshold. Therefore, when installing EVSE in a commercial building, it is very important to communicate with the power company.

Another consideration for commercial buildings includes the cost of powering charging piles. If you run a high-capacity 480VAC circuit at any distance, the cost will be very expensive. Depending on the level of service you need, you may need the power company to install additional high-Voltage transformers.

Concluding remarks

The installation of a new electric vehicle charging system will significantly change the electricity demand of residential and commercial buildings. Therefore, the power supply required by the charging station or EVSE is a key consideration.

key point

· The first step in determining the power demand is to have an electrician perform a load assessment to determine whether the current power supply capacity is sufficient. The key factors include:

Calculated building electricity load
Current power supply capacity
EVSE expected load

・ Most charging piles currently deployed are level 2 charging piles. The typical level 2 charging pile has a power of 7.2kW and a working current of 30A. Because the electrical code requires the power supply capacity of the circuit to be 20% higher than the expected load, a 40A power supply circuit is required to install this charging pile. The working current of the 9.6kW Class 2 charging pile is 40A, which requires a 50A power supply circuit. The maximum output power of the 2-level charging pile is 19.2kW, the working current is 80A, and a 100A power supply circuit is required.

・ Before negotiating commercial electricity prices, companies need to accurately predict the electricity demand for electric vehicle charging to avoid generating electricity charges that may be quite expensive. Once the demand price is activated, the price will continue to be used in subsequent power consumption cycles, even if the actual power consumption is lower than the demand threshold.

Author: David Talbott

Before installing an electric vehicle (EV) charging station, whether you are an electric vehicle owner or a professional who is responsible for installing charging stations for customers or employees, you need to consider the power requirements for powering the charging station or electric vehicle charging station (EVSE). Installing an electric car charging system will significantly change your electricity needs. In order to clearly illustrate this problem, Christoper Michelbacker, Audi’s electric vehicle charging and infrastructure manager, gave an example of an ordinary house. “The daily electricity load of an ordinary family is about 5kW, so adding a 9.6kW charging pile is likely to double the electricity load of this family.” Then, how to predict the electricity demand of household and commercial electric vehicle charging piles Woolen cloth?

Determine your power needs

To understand whether your house or building can withstand this increased load, you must first ask an electrician to conduct an electricity load assessment to determine whether the current power supply capacity is sufficient. The key factors include:

・ Calculated building electricity load
・ Current power supply capacity
・ Expected load of EVSE

Planning the installation of household charging piles

At present, most of the charging piles installed in residential buildings are Class 2 charging piles and require a 240VAC power supply circuit. The typical level 2 charging pile has a power of 7.2kW and a working current of 30A. Electrical specifications require that the power supply capacity of the circuit is 20% higher than the expected load, so the installation of this charging pile requires a dedicated 240V, 40A power supply circuit. The working current of the 9.6kW Class 2 charging pile is 40A, which requires a 50A power supply circuit. The maximum output power of the 2-level charging pile is 19.2kW, the working current is 80A, and a 100A power supply circuit is required. If other services are needed to support EVSE, then additional meters and switchboards may be required. Other considerations for residential installation include:

・ Is the charging station hard-wired or plug-in?
・ Where will the charging station be installed?
・ How should I deliver electricity from the distribution board to the charging pile?

Planning the installation of commercial charging piles

To deploy a more robust charging solution, companies also need to assess the building’s electrical load to determine whether the current electrical services can be supported, and there are other considerations. For example, if the charging solution involves multiple 2-level charging piles, the calculation method is similar to that of household charging piles, multiplying the number of charging piles by their output capacity (current and power). Commercial installations may require multiple dedicated 240V power supply circuits, and the total load may increase significantly relative to the base load of the building. The DC fast charging charging pile requires a voltage of 480V, and depending on its output power, a large current may be required. Most commercial buildings have 480VAC circuits, which can be divided into 240V branch circuits. The DC fast charge charging pile requires a dedicated 480V circuit.

For commercial buildings, there is another important consideration. That is, it is necessary to accurately calculate the basic load of this building in order to negotiate commercial electricity prices that fluctuate with demand. Michelbacher explained this issue in detail. “Usually, commercial electricity prices are negotiated and determined based on electricity demand. The so-called electricity demand is the expected peak load during operation. Users will pay for the actual electricity consumption (kWh) at this electricity price. If your electricity consumption exceeds The demand threshold is to pay according to the new demand electricity price, which is much higher than the original price. Now we assume that the base load of the building is 40kW. Ideally, you want to negotiate a price that matches your actual electricity consumption as much as possible If your normal use power is 20kW, you don’t want to negotiate a 100kW power demand threshold, because you will have to pay for the unused power. Now let’s suppose you get the negotiation based on the 40kW building’s power load Electricity price, and a 50kW fast charging charging pile is installed. The building is operating normally at 40kW, and suddenly someone starts to charge the car with the charging pile. During the charging period, the energy consumption of the building is 90kW. Once it is exceeded The threshold of 40kW starts to calculate the electricity price based on the demand price. Although the demand price varies with the region and the power company, the charge per kilowatt hour may be very high and will be added to the commercial electricity price you negotiate. Once the demand price is reached When it is started, the electricity price will continue to be used in the following electricity cycle, even if the actual electricity consumption is lower than the demand threshold. Therefore, when installing EVSE in a commercial building, it is very important to communicate with the power company.

Another consideration for commercial buildings includes the cost of powering charging piles. If you run a high-capacity 480VAC circuit at any distance, the cost will be very expensive. Depending on the level of service you need, you may need the power company to install additional high-voltage transformers.

Concluding remarks

The installation of a new electric vehicle charging system will significantly change the electricity demand of residential and commercial buildings. Therefore, the power supply required by the charging station or EVSE is a key consideration.

key point

· The first step in determining the power demand is to have an electrician perform a load assessment to determine whether the current power supply capacity is sufficient. The key factors include:

Calculated building electricity load
Current power supply capacity
EVSE expected load

・ Most charging piles currently deployed are level 2 charging piles. The typical level 2 charging pile has a power of 7.2kW and a working current of 30A. Because the electrical code requires the power supply capacity of the circuit to be 20% higher than the expected load, a 40A power supply circuit is required to install this charging pile. The working current of the 9.6kW Class 2 charging pile is 40A, which requires a 50A power supply circuit. The maximum output power of the 2-level charging pile is 19.2kW, the working current is 80A, and a 100A power supply circuit is required.

・ Before negotiating commercial electricity prices, companies need to accurately predict the electricity demand for electric vehicle charging to avoid generating electricity charges that may be quite expensive. Once the demand price is activated, the price will continue to be used in subsequent power consumption cycles, even if the actual power consumption is lower than the demand threshold.

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