20 Questions about User-side Energy Storage

The user-side energy storage we generally know mainly refers to the electrochemical energy storage used by a large number of industrial and commercial customers. The energy storage device can be simply understood as a large power bank. It charges when the electricity price is low and discharges when the electricity price is high. It is used for enterprise production and a series of electrical equipment, thereby reducing the enterprise's electricity costs.

(1) Peak shaving and valley filling: charging during valley and flat periods, discharging during peak and peak periods, and utilizing the peak-valley electricity price difference to reduce the enterprise's electricity costs.

(2) Balancing demand charges: The energy storage system can shave peaks and valleys, eliminate peak loads, smooth the electricity curve, and reduce demand charges.

(3) Dynamic capacity expansion: The user's transformer capacity is fixed. Generally, when the user needs the transformer to operate at overload during a certain period of time, the transformer needs to be expanded. After installing a matching energy storage system, the transformer load can be reduced during this period through energy storage discharge, thereby reducing the cost of transformer capacity expansion and transformation.

(4) Demand-side response: After installing the energy storage system, if the power grid issues a demand response, customers do not need to limit electricity or pay high electricity charges during that period. Instead, they may participate in demand response transactions through the energy storage system and obtain additional compensation.

User-side energy storage is mainly used in objects with relatively regular electricity consumption, such as car charging stations, industrial parks, data centers, and communication base stations.

(1) The integrated operator invests, builds, and operates. Customers do not need to pay a penny. They only need to provide a site for the construction of the energy storage system. The revenue obtained is shared by the integrated operator and the user.

(2) Both parties share the revenue, and the specific revenue sharing is negotiated based on the customer's electricity consumption and the size of the energy storage system.

(3) The user invests in and builds the energy storage system, and the integrated operator is responsible for operation and promises customer revenue.

The recommended cooperation period is generally 15 years.

It usually takes 3 to 6 months from contract signing to project formal operation, depending on the specific conditions and complexity of the site.

Currently, basically no country or region has set conditions for user-side energy storage construction. Generally, it is not less than 5MWh/year. Generally speaking, the greater the power consumption, the greater the energy storage capacity that can be configured for the project, and the greater the return on investment.

A 1MWh energy storage power station covers an area of ​​about 10㎡, and if the front and back safety distance is considered, it is 20-30㎡.

(1) The site is located outdoors, and there is no hazardous chemical warehouse within 20 meters.

(2) Try to be close to the distribution room, and the maximum distance from the distribution room should not exceed 100 meters.

The installation of the energy storage power station needs to be registered on the website of the local Development and Reform Bureau. This procedure is the responsibility of the integrated operator. The owner only needs to cooperate to provide information.

After the formalities are completed, the official construction period is about 1-1.5 months; a short-term power outage is required to install the grid-connected cabinet, and the shortest power outage time is about 2 hours.

For customers who choose a certain integrated operator, the integrated operator will be responsible for the operation and maintenance of the energy storage power station after completion. At the same time, the owner's relevant staff will generally receive simple training and provide solutions for special circumstances.

No. If it is charged by capacity, the basic electricity fee is fixed. If it is charged by demand, it is possible that the energy storage discharge will bear the load, reducing the maximum demand and thus reducing the basic electricity fee.

When designing the energy storage capacity, the capacity and load of the transformer have been considered, and the demand will not be increased due to energy storage charging. If the demand is increased, the energy management system (EMS) will automatically identify and stop energy storage charging.

If there are losses, the losses have been taken into account and deducted when the two parties share the profits.

Accurate, all electricity metering meters installed are meters that meet international standards and have passed the test.

If Party B's equipment causes Party A's equipment to fail or be damaged, the losses suffered by Party A shall be compensated by Party B. At the same time, Party B is responsible for insuring the machine damage insurance and all-risk property insurance related to the project during the performance of the contract, and bears the insurance premium. The insured amount of property insurance should not be less than the actual value of the insured property.

The daily operation of the power station does not require users to cut off power.

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

The switching strategy needs to be set in advance. The energy storage equipment is different from UPS and cannot be fully automatically switched.

The main loss part of the energy storage equipment is the battery cell. The health of the battery cell will decrease with the increase of usage time. After it decreases to a certain extent, the integrated operator will be responsible for replacement.