What are the benefits of installing an energy storage system?

(1) Peak shaving and valley filling: By taking advantage of the price difference between peak and off-peak electricity prices, the energy storage system charges during off-peak and normal periods, and discharges during peak and super-peak periods, thus reducing the electricity consumption costs of enterprises.
(2) Balancing demand charge: The energy storage system can perform peak shaving and valley filling, eliminate peak loads, smooth the electricity consumption curve, and reduce the demand charge.
(3) Dynamic capacity expansion: The capacity of the user's transformer is fixed. Generally, when the user needs the transformer to operate overloaded for a certain period, the transformer needs to be expanded in capacity. However, after installing a matching energy storage system, it is possible to discharge through the energy storage during that period to reduce the load on the transformer, thereby reducing the cost of transformer capacity expansion and renovation.
(4) Demand-side response: After installing the energy storage system, if the power grid issues a demand response, customers do not need to implement power rationing and do not need to pay the high electricity bills for that period. Instead, they may participate in demand response transactions through the energy storage system and obtain additional compensation fees.

What are the main application scenarios of industrial and commercial energy storage?

Industrial and commercial energy storage is mainly applied to objects with regular power consumption patterns, such as charging stations, industrial parks, data centers, and communication base stations.

Under what circumstances is it suitable for an enterprise to install an energy storage system?

（1）High electricity demand: Enterprises or scenarios with high electricity demand, such as industrial parks, manufacturing industries, and data centers, usually have volatile electricity demand. Industrial and commercial energy storage systems can help such enterprises smooth out the electricity consumption curve and reduce electricity costs.
（2）High requirements for power quality: Some enterprises and parks may experience low voltage during the production process, especially during peak load periods, and the terminal voltage is seriously below the lower limit. Equipping with industrial and commercial energy storage systems can stabilize power output, improve power quality, and avoid the impact of power fluctuations or outages on production.
（3）Large price difference between peak and valley electricity prices: Enterprises' electricity consumption is subject to the local time-of-use electricity price policy, and the average price difference between peak and valley electricity prices is large, generally recommended to be above 0.8 yuan/kWh. The enterprise's electricity load period covers the peak period (and the super-peak period, if any). If the enterprise uses electricity only at night, it is not suitable for the construction of an energy storage system. During the off-peak and normal periods of the enterprise's electricity consumption, except for the enterprise's original load, the transformer still has enough remaining capacity to charge the energy storage system. The number of days for the enterprise's shutdown and maintenance and the off-season is small, and the annual available time of the energy storage system is more than 300 days. If the utilization time of the energy storage is not high, the rate of return will be low.

What information should enterprises know about when it comes to energy storage allocation?

(1) Type of electricity consumption of the user: Clearly determine whether the user's electricity consumption type is large industrial electricity consumption or general industrial and commercial electricity consumption.
(2) Billing method: Clearly determine whether the user's electricity billing method is a single-rate system or a two-part tariff system. For the demand electricity fee, the control of the maximum demand should be considered without affecting the basic electricity fee. The above two points can be understood through the electricity bill (usually the most recent 12 months are required), which mainly involves electricity price information, demand or capacity electricity fee situations. (3) Transformer capacity: When the energy storage system is charging, it is equivalent to a load. If the remaining capacity of the existing transformer is insufficient, it will limit the installed capacity of the energy storage system. It is necessary to understand the usage situation of the existing transformer and the capacity occupied by the load, especially whether there is remaining idle capacity of the transformer during the off-peak period at night. Try to collect the load situation of the park's transformers and the electricity load curve situation (the load data of the past 12 months can be retrieved from the power grid).

Regarding the investment, construction and operation income model of industrial and commercial energy storage?

(1) The integrated operator will carry out the investment, construction and operation. The customer doesn't need to pay a single penny and only needs to provide the site for the construction and use of the energy storage system. The obtained profits will be shared between the integrated operator and the user.
(2) The two parties share the profits, and the specific profit sharing ratio will be negotiated according to the customer's electricity consumption situation and the scale of the energy storage system.
(3) The user invests in and constructs the energy storage system by itself, and the integrated operator is responsible for the operation and promises the customer a certain amount of profit.

What is the cooperation period of industrial and commercial energy storage projects?

The recommended cooperation period is generally 15 years.

How long does it take from contract signing to project implementation?

Generally, it takes 3 to 6 months from the contract signing to the official commissioning of the project, depending on the specific situation and complexity of the site.

What electricity consumption standards should an enterprise meet to install an energy storage power station?

At present, the state and local governments have not set conditions for the construction of industrial and commercial energy storage. In the Guangdong region, the annual electricity consumption is generally not less than 5 million kWh, and in the Zhejiang region, it is generally not less than 3 million kWh per year. Generally speaking, the greater the electricity consumption, the larger the energy storage capacity that can be configured for the project.

What is the floor area of the energy storage power station?

The floor area of a 200kWh energy storage power station is approximately 1.2 square meters. If the safety distances in the front and rear are taken into account, it will be around 3.5 square meters.

What are the site requirements for installing an energy storage power station?

Try to choose a location that is far away from office premises and densely populated areas, close to the power distribution room of the access point (it is recommended to be within 100 meters) and convenient for cable arrangement. Consider a hardened site that is convenient for transportation, hoisting, and can bear the load.
Note: In actual projects, safety protection passages and isolation passages should be reserved according to the requirements of the local fire department.

Does the installation of an energy storage power station require the owner to assist in handling the procedures?

For the installation of an energy storage power station, it is necessary to file the project on the website of the local Development and Reform Bureau, obtain the approval for power connection from the power company, and file for energy storage subsidies. In addition, according to the requirements of different regions, it may involve other review procedures such as fire protection design review, environmental impact assessment report, and safety assessment report. Therefore, it is necessary to understand the acceptance and approval requirements for industrial and commercial energy storage in the local area and make preparations for the preliminary budget of the project. All of the above procedures are the responsibility of the integrated operator, and the owner only needs to cooperate by providing relevant materials.

How long is the construction period of the energy storage power station? Is it necessary to cut off the power? If so, how long will the power outage last?

After the formalities are completed, the official construction period is approximately 1 to 1.5 months. A short-term power outage is required for the installation of the grid-connected cabinet, and the power outage time is about 2 hours.

Who will be responsible for the operation and maintenance of the energy storage power station after its completion? Is it necessary for the owner's personnel to participate?

For customers who choose a certain integrated operator, after the energy storage power station is completed, the integrated operator will be responsible for its operation and maintenance. At the same time, the integrated operator will generally provide simple training for the relevant staff of the owner and offer solutions for handling special situations.

Will the energy storage power station increase the basic electricity cost of the owner?

No, it won't. If the electricity fee is charged according to the capacity, the basic electricity fee is fixed originally. If it is charged according to the demand, there is even a possibility that the load is borne by the energy storage discharge, which reduces the maximum demand and thus lowers the basic electricity fee. When designing the energy storage capacity, the capacity and load of the transformer have been taken into consideration. The demand won't be increased due to the charging of the energy storage. When the demand is likely to be increased, the Energy Management System (EMS) will automatically identify it and stop the charging of the energy storage.

Will the energy storage power station incur losses? If so, which party will be responsible for them?

There are losses, and the losses have been taken into account and deducted when the two parties divide the profits.

Is the metering of the energy storage power station accurate?

It is accurate. All the electricity consumption meters installed are meters that meet the requirements of national standards and have passed the inspection.

Who is responsible for the safety issues of the energy storage power station?

If Party A's equipment malfunctions, is damaged, destroyed or lost due to the equipment of Party B, Party B shall compensate Party A for the losses suffered thereby. At the same time, during the performance of this contract, Party B shall be responsible for insuring the machinery breakdown insurance, all risks insurance for property and other insurances related to the project, and bear the insurance premiums. The insured amount of the property insurance shall not be less than the actual value of the insured property.

Does the user need to cut off the power during the daily operation of the energy storage power station?

Users do not need to cut off the power during the daily operation of the power station.

Will there be power flicker during the switching of the energy storage power station?

No. The energy storage equipment will not have a negative impact on the power quality for users.

Is the energy storage power station instantaneously connected or does it need to be manually adjusted when providing emergency power supply?

It is necessary to set the switching strategy in advance. Different from the UPS, the energy storage equipment cannot achieve fully automatic switching.

Will the energy storage equipment be replaced after it is worn out to a certain extent? Who will bear the cost?

The main part subject to wear and tear of the energy storage equipment is the battery cell. The health level of the battery cell will decline as the usage time increases. Once it drops to a certain extent, the integrated operator will be responsible for the replacement, and the enterprise does not need to bear the cost.

What is a Battery Management System (BMS)?

The English name of the Battery Management System is BATTERY MANAGEMENT SYSTEM. It serves as a link between the battery and the user, mainly aiming to improve the utilization rate of the battery and prevent the battery from overcharging and over-discharging. In the energy storage system, parameters such as "tall or short, fat or thin" correspond to three data: voltage, current, and temperature. Based on complex algorithms, it is possible to infer the SOC (State of Charge) of the system, the start and stop of the thermal management system, the insulation detection of the system, and the balance among the batteries. The BMS should take safety as its design starting point, follow the principle of "prevention first, control and guarantee", and systematically solve the safety management and control of the energy storage battery system.

What is an energy storage converter (PCS)?

In fact, the energy storage converter is quite common in daily life. The function of a mobile phone charger is to convert the 220V alternating current from a household socket into the 5V to 10V direct current required by the battery in the mobile phone. This is consistent with the mode in which the energy storage system converts alternating current into the direct current required by the battery stack during the charging process. The PCS in the energy storage system can be understood as an oversized charger. However, the difference between it and a mobile phone charger is that it is bidirectional. The bidirectional PCS acts as a bridge between the battery stack and the grid side. On the one hand, it converts the alternating current from the grid side into direct current to charge the battery stack. On the other hand, it converts the direct current of the battery stack into alternating current and feeds it back to the grid.

What is an Energy Management System (EMS)?

A researcher in distributed energy once said, "A good solution stems from top-level design, and a good system comes from the EMS." This shows the importance of the EMS in the energy storage system. The Energy Management System exists to gather the information of each subsystem within the energy storage system, comprehensively monitor the operation of the entire system, make relevant decisions, and ensure the safe operation of the system. The EMS will upload data to the cloud, providing operation tools for the backstage management personnel of the operator. At the same time, the EMS is also responsible for direct interaction with users. The operation and maintenance personnel of users can view the operation status of the energy storage system in real time through the EMS, enabling them to implement supervision.

What is industrial and commercial energy storage?

Answer: The industrial and commercial energy storage we usually talk about mainly refers to electrochemical energy storage applied to a large number of industrial and commercial customers. The energy storage equipment can be simply understood as a large-scale power bank. It charges when the electricity price is low and discharges for enterprise production when the electricity price is high, thus reducing the electricity consumption costs of enterprises.

What are the benefits of installing an energy storage system?

(1) Peak shaving and valley filling: By taking advantage of the price difference between peak and off-peak electricity prices, the energy storage system charges during off-peak and normal periods, and discharges during peak and super-peak periods, thus reducing the electricity consumption costs of enterprises.
(2) Balancing demand charge: The energy storage system can perform peak shaving and valley filling, eliminate peak loads, smooth the electricity consumption curve, and reduce the demand charge.
(3) Dynamic capacity expansion: The capacity of the user's transformer is fixed. Generally, when the user needs the transformer to operate overloaded for a certain period, the transformer needs to be expanded in capacity. However, after installing a matching energy storage system, it is possible to discharge through the energy storage during that period to reduce the load on the transformer, thereby reducing the cost of transformer capacity expansion and renovation.
(4) Demand-side response: After installing the energy storage system, if the power grid issues a demand response, customers do not need to implement power rationing and do not need to pay the high electricity bills for that period. Instead, they may participate in demand response transactions through the energy storage system and obtain additional compensation fees.

What are the main application scenarios of industrial and commercial energy storage?

Industrial and commercial energy storage is mainly applied to objects with regular power consumption patterns, such as charging stations, industrial parks, data centers, and communication base stations.