Hoymiles’ C&I ESS features an optimized refrigeration system and air duct architecture that eliminates internal turbulence during heat exchange operations
Its built-in motors, including compressors and fans, are speed-controlled according to real-time load demand
Unlike the traditional ESS, its liquid cooling mechanism reduces the number of fans and the rotational speed
Module-level power electronics (MLPE) and energy storage solutions provider Hoymiles’ HoyUltra 2 series commercial and industrial (C&I) energy storage solution (ESS) has received low-noise-level certification. This certification from the Zhejiang Electric Safety and Quality Inspection Center enables it to get project approval for applications that require ≤60 dB operational noise.
The company says it has maintained a balance between the ESS’s physical configurations and operational acoustic profiles from the initial design phase. The conventional ESS’s air duct system, which generally comes under the refrigeration mechanism, causes internal turbulence during heat exchange. Hoymiles, however, claims that its optimized refrigeration system and air duct architecture eliminate chances of internal turbulence during heat exchange via circulating liquid coolant. As a result, it suppresses operational noise across multiple dimensions of the system while improving heat exchange efficiency. In addition, its built-in motor control function enables coordinated operation of fans and compressors by adjusting speed in response to real-time load. This ensures a balance between efficiency and noise levels. And lastly, without specifying the figures, the company says its ‘fully liquid-cooling architecture’ helps reduce the number of fans and their rotational speed (RPMs) compared to traditional counterparts, further controlling noise at the source.
During the certification, the HoyUltra 2 ESS was tested in a semi-anechoic chamber with a background noise level of just 24 dB. The test results showed it has an overall A-weighted sound pressure level of 47.4 dB(A), simulating the entire operational lifecycle, including full charging and discharging. On the other hand, the traditional ESS unit has a higher rated operational noise range of 65 dB to 75 dB, the company notes.
