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About AC Coupled Energy Storage Unit

Solar energy, as green energy, has been vigorously promoted by governments all over the world due to it good performance in environmental protection and pollution control. After more than 10 years of rapid development, the cost of solar power generation system has decreased dramatically, and it has been widely used all over the world. At present, the majority of households have installed grid-connected photovoltaic power generation system. When a residential photovoltaic power generation system generates electricity, the energy will be consumed by the load in the PV system owner’shome, and the excess electricity can only be fed to the public grid.

Due to the property of photovoltaic power generation, solar power generation system generates power only in the daytime. On the contrary, statistics shows that the electricity consumption peak occurs in the morning and evening. The power generation curve of photovoltaic power generation system differs greatly from that of power consumption. In the early days of the promotion of solar power systems, governments gave subsidies to encourage PV system ownersto install and use solar power systems and sell excess electricity to grid companies. However, over time, policies are constantly being adjusted. Now the subsidy policy has been basically abolished. PV system owner can only sell their energy to power companies at low prices or waste it in vain. As a result, PV system owner urgently need a way to improve the utilization of electricity. Consequently, energy storage technology has been developed.

(Fig. power generation Curve VS power consumption curve)

Application of AC Coupled Solution

There are many energy storage technology options on the market. The current popular way to store and utilize power is AC Coupling Unit (ACU). This is a solution for PV system owners who already have a photovoltaic power system installed. Simply speaking, in the AC coupled solution, the storage system can detect whether the PV system generates excess energy, and use ACU to charge the batteries to store the energy. When the PV system owner needs electricity, the energy in the battery is converted to AC to run the load. As a result, the utilization of electricity generated by user power generation systems has been greatly improved. PV system owners can use the energy generated by their home power generation system in the morning and in the evening.

(Fig. system block diagram of ACU)

Risks with large installations of energy storage systems

Batteries account for a large proportion of the cost in the AC coupled solution. In the past years, the installed capacity of energy storage systems worldwide has increased dramatically. There is risk behind the large number of installed energy storage systems. Battery products used in energy storage systems are required to comply with IEC/EN 62619 regulations. However, due to high price of the battery, some manufacturers sell battery that have not been certified. These batteries products often come from industries such as new energy automobiles and do not exactly match the requirement of household energy storage systems. The risk will be greatly increased during use. On the other hand, precise control parts such as BMS are also included in the battery. When there are after-sales problems, PV system owners will face both battery and inverter manufacturers. Battery manufacturer and Inverter Manufacturer spend a lot of time communicating and understanding problems and coordinating due to various uncertainty such as technical identification of the cause , time difference, cultural differences, etc. What's more, both sides shirk their responsibilities, which greatly increases the cost and difficulty after sales. Therefore, it is very important to choose a reliable and easy product---AC Coupled Unit launched by TSUN

(Photo of AC Coupled Unit)

TSUN launched All-in-one AC Coupled Unit

TSUN launched TSOL-ACU series products. This is an integrated AC coupling solution that combines the inverter with the battery.

TSOL-ACU series products adopt batteries modules that conform to IEC/EN62619 certification, and pass IEC/EN62619 test on energy storage system, which meets the requirements of household energy storage system and ensures the safety of users.

In addition, due to the integrated design concept, TSUN will handle the after-sale problems of TSOL-ACU series products in a unified way. No longer will the customer worry about after-sale with the inverter and batteries. TSUN will provide complete after-sales service to help customers solve on-site problems quickly so that customers can use it safely with ease.

For more information, please visit the official website www.tsun-ess.com.