Recently, the technical department of Shenzhen GSL Energy Co., Ltd. (referred to as “GSL ENERGY”) organized and participated in a technical support event at the invitation of a project owner in the US. Mr. Stone, the project manager, traveled to Puerto Rico to provide technical demonstrations and support.

In the Caribbean region of the United States, GSL ENERGY installed forty-eight 10 kWh low-voltage rack-mount batteries. These batteries were connected in parallel using GSL’s unique low-voltage HUB technology to generate 480 kWh of power for backup and load supply.

Low-voltage HUB technology refers to the parallel connection of multiple HUB modules in a low-voltage electrical system. In the energy storage field, achieving stable operation of 48 batteries in parallel requires balancing and resolving issues such as current sharing, communication control, thermal management, and protection mechanisms, which is not a simple task.

However, two years ago, GSL ENERGY implemented the parallel operation of 32 energy storage batteries in a Swiss project, and the system has continued to operate stably. Using the battery parallel connection technology provided by GSL, after continuous verification and testing, the parallel connection of 48 low-voltage energy storage battery hubs has been achieved.

1. Interleaved Parallel Connection: Improving Efficiency and Reducing Ripple

As we all know, when multiple hubs are operating in parallel, harmonic currents are generated. These harmonics can cause grid voltage distortion, affecting the normal operation of other equipment, and reducing the control accuracy of the hub battery modules themselves.

For battery charging scenarios, GSL ENERGY promotes an interleaved parallel connection solution to reduce output current ripple while optimizing converter parameter design, thereby reducing output current ripple and improving power density and efficiency.

2. Current Sharing Technology: Ensuring Parallel Stability

To ensure the stable operation of 48 batteries, the charge and discharge currents of each battery must be evenly distributed. However, due to individual differences in battery production, such as inconsistencies in internal resistance and capacity, current distribution will likely be uneven. Long-term current imbalance can cause batteries to overcharge or over-discharge, shortening the battery life and even causing safety issues. GSL ENERGY utilizes intelligent current-sharing control technology, fully accounting for inter-module interactions and overall system performance. This not only allows for precise control of each module’s voltage, current, power, and other parameters, but also enables continuous adjustment and optimization during use.

Furthermore, the GSL ENERGY battery energy storage system has excellent adaptability to load variations and electromagnetic compatibility. It minimizes the impact of communication failures, electromagnetic interference, and load fluctuation shocks.

As a leading provider of battery energy storage solutions for both commercial and industrial energy storage and residential energy storage, GSL ENERGY has deployed over 5.8GW of battery energy storage systems to over 138 countries. All of its products use REPT A-grade cells, ensuring the quality and safety. GSL ENERGY is one of the few manufacturers in the industry to offer a 10-year warranty. We offer 24/7 after-sales service and technical support to solve all the problems you encounter.

The successful application of forty-eight 10 kWh energy storage batteries using low-voltage HUB parallel technology demonstrates that GSL ENERGY’s low-voltage parallel technology has become very stable and even reached international leading levels in application. This highlights GSL ENERGY’s technical strength in battery energy storage systems and increases its international reputation. In the near future, we look forward to having win-win cooperation with more and more overseas partners.