First, let’s take a look at the battery module box. The 314Ah batteries inside the battery module box are grouped in the form of 1P104S. The 1P26S batteries inside are connected in series and parallel to form a battery module, which is divided into 4 battery modules. There is a fused MSD mounted on the front panel. Installing a fuse can provide short-circuit protection for the batteries in the package. The series voltage of 104 batteries is a bit high, and installing an MSD can play an internal isolation/disconnection role. The cabinet adopts a shell-cooled integrated lower cabinet and upper cover design.

The battery cluster is composed of 4 battery module boxes. There are 9 slots in a row in the container. The upper and lower battery module boxes form a cluster. The battery clusters are connected in series to form a group 1P416S.

There are two configuration designs for battery cluster energy output; one is a switch box and the other is an embedded string PCS. Let’s talk about the first switch box solution first. Looking at the DC switch box solution from the promotional materials provided by Sungrow, the switch box seems to use liquid cooling for heat dissipation. It may be a mistake. The cost of liquid cooling for the switch box is a bit high. , this is not necessary. From another picture, it seems that the switch box should dissipate heat naturally. There are two DC input interfaces on the front panel of the switch box, which combine the two clusters of batteries into one output.

The second string PCS solution, the picture below shows Sungrow’s 210kW string PCS using liquid cooling. Each 210kW PCS is connected to a cluster of 417.99kWh batteries. Two positive and negative pole connections come out of each of the two clusters of batteries. They are first connected to the DC sides of the two PCSs through the junction box. The DC side of the junction box is equipped with a fuse. level short circuit protection. The two AC lines from the two PCS are combined into one output in the junction box. The picture below shows the installation method of the junction box and two PCSs. The three are arranged in front and back and enter the cabin in sequence.

This is a 4-hour energy storage system configuration plan. One of the PCSs can be removed and the DC lines can be connected to two points in one connection in the junction box. A 210kW PCS is connected to two clusters of 417.99kWh batteries. This design allows for flexible matching. A liquid-cooled unit is housed in the electrical compartment. This liquid cooling unit is customized and developed by Sungrow from a supplier. The liquid cooling unit cools and dissipates heat for the battery and PCS. It is different from the 5MWh energy storage battery container liquid cooling system of other manufacturers and needs to be considered. Liquid cooling for PCS.

The design of the fire protection system adopts two options: gas fire protection and water fire protection. Gas firefighting is a cabin-level submerged firefighting. Because the battery module box is too deep, the pack-level firefighting gas nozzles cannot completely cover all the battery cells inside, so the firefighting nozzles on the pack are removed. Fire exhaust and pressure relief devices are installed on the top of the container. This design is a bit like Tesla's Megapack2 XL. Smoke detectors, temperature detectors and flammable gas detectors are all standard, but there is an additional explosion-proof camera.

The secondary/tertiary pipelines for water fire protection are embedded in the battery cluster support beams, and a water nozzle is arranged for every two layers of battery module boxes. The fire protection design plan is still relatively standardized.The other parts are the AC power distribution and communication control intelligent auxiliary systems. This part is the main electrical design plan. Since there are no relevant drawings, it cannot be analyzed.

To sum up, the integration of Sungrow's PowerTitan2.0 energy storage products is still very difficult. It needs to integrate BMS, PCS, EMS, local monitoring and a complete set of system integration technologies, and has strong comprehensive technical capabilities. It is expected that other domestic energy storage manufacturers will have more innovations and upgrades, and can contribute more and better products to promote the development of the energy storage industry.