Case sharing and profit model of 40 charging pile

In the current context of the popularity of EVs, charging stations are an important infrastructure supporting electric vehicles. But how is a charging station built? From site selection to putting it into use, many hidden details require attention in every aspect.

Charging station project construction is a complex process involving multiple stages and links. This process not only includes the installation of hardware, but also involves many aspects such as project planning, design, approval, construction, and later operation and maintenance. The following is the general charging pile or charging station project construction process:

charging stations

1. Project planning and market research

At the beginning of the project, detailed market research and feasibility analysis are required. This includes electric vehicle ownership in the target market, potential user demand, competitor analysis, site selection analysis, etc. At the same time, the size, type, investment budget, and expected return of the project also need to be estimated.

The focus of this link is site selection assessment, that is: selecting a suitable location, taking into account accessibility, target user density, and grid access conditions.

2. Design planning

Carry out detailed planning and design of charging stations based on market research results. This includes charging pile model selection, layout design, power demand calculation, safety measure design, etc. At the same time, the future scalability and sustainability of charging stations also need to be considered.

The focus of this link is power demand and safety, that is: accurately calculating the maximum power demand of the charging station and designing a power access plan that meets the requirements of the local power supply company.

The transformer is one of the core equipment of the charging station, and the reasonable selection of its capacity is directly related to the construction cost and operating efficiency of the charging station. Taking an actual electric bus charging station project as an example, the process and precautions are introduced in detail to provide a reference for similar projects.

A new 12-meter pure electric bus charging station on 15 acres of land will be built, using a charging method of one vehicle and one pile. The number of piles is 40. Using the mode of charging at night and replenishing during the day, 300kWh of electricity can be fully charged in 4-6 hours at night. The rendering is as follows:

Electricity demand analysis

Electricity demand analysis

Total capacity of electric bus battery pack: 300 kWh (fully charged at night);

Recommended charger power: 60kW

Charging capacity = charger-rated power X total charging time X charging coefficient

Night charging capacity = 60kW x 6h x 0.85 = 306kWh; (0.85 is the charging coefficient)

(The charging coefficient refers to the proportion of time consumed by communication confirmation, safety detection, and charging strategy to allocate output power during the charging process)

The bus is charged at night and is fully charged in 6 hours. The charging power is about 300kWh. In addition, the general vehicle battery has residual capacity, so the charging time at night will be less than 6 hours.

Transformer capacity calculation

Total power required for charging equipment:

The total power required by the charging equipment = (total output power of the charger/transformer efficiency/line and reactive power loss)*simultaneous use coefficient of the charger =60kW*40/0.9/0.85*0.8 ≈2510kVA;

Other electrical power consumption:

Total power consumption for lighting, air conditioning, office, auxiliary equipment, etc.: 100kVA;

The total power consumption of the charging station = the total power required by the charging equipment + other power consumption = 2510kVA + 100kVA = 2610kVA;

Transformer load factor: 80~90%; that is, 2610kVA÷85%≈ 3070 kVA;

It is recommended that the total capacity of the supporting transformer is 3200kVA, and the secondary power consumption (or third-level power consumption) is a dry-type amorphous transformer, D Yn11 mode, consisting of two 1600kVA main transformers (10kV/0.4kV), power distribution equipment, It is composed of metering cabinets, cables, etc.

Through this electric bus charging station transformer capacity calculation case, we can see that reasonable determination of the transformer capacity requires comprehensive consideration of many factors, including the power demand of the charging equipment, the power consumption of other electrical equipment, transformer efficiency, line loss, Reactive power loss, simultaneous use coefficient of chargers, etc.

Scientific calculations and selection can only be made based on a detailed understanding of the project situation and technical parameters. At the same time, determining the transformer capacity also needs to consider economy and reliability, not only to meet the actual needs of the charging station but also to avoid unnecessary waste caused by blind pursuit of high standards.

3. Obtain necessary licenses and approvals

Before specific implementation, applying for a construction permit from the relevant government department is necessary. This may include land use rights, building consents, electrical connection consents, etc.

The focus of this link is document preparation, that is: preparing complete application documents to ensure a smooth approval process.

4. Construction and installation

After obtaining all necessary permits and approvals, construction and installation can begin. This stage includes land leveling, infrastructure construction, charging pile installation, power system access, communication network setup, etc. During the construction process, safety regulations and quality standards need to be strictly adhered to.

The focus of this link is construction management, that is: selecting experienced contractors to ensure construction quality and safety.

5. Debugging and acceptance

After the construction, the charging station must be comprehensively tested and debugged to ensure that all equipment operates normally and meets the design requirements. After the test is correct, formal project acceptance needs to be carried out.

The focus of this link is completion acceptance, that is: ensuring that the charging station meets all design and safety standards and passes the acceptance of each unit.

Develop reasonable pricing strategies and user service policies

6. Operation and maintenance

After the project is completed, it enters the operation phase. An operation management system needs to be established, including charging service pricing, customer service, fault handling, etc. At the same time, charging facilities also need to be maintained regularly to ensure safe operation.

The construction of charging stations is a complex process involving many details. No step can be overlooked because, as we have seen, “the devil is in the details.” Through careful planning and execution, we can not only build charging stations that meet current needs but also lay the foundation for future business development.

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