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Quietly Powerful: Hoymiles HoyUltra 2 C&I ESS Achieves Breakthrough ≤60 dB(A) in Certified Noise Testing
As energy storage systems (ESS) are increasingly deployed in commercial centers and residential neighborhoods, noise levels have become a critical factor for project approval. Hoymiles' HoyUltra 2, the liquid-cooling C&I battery system, has achieved ≤60 dB noise level certification in a recent noise evaluation test conducted according to the international ISO 3744:2010 standard by the Zhejiang Electric Safety and Quality Inspection Center. While the industry average is 65–75 dB, the breakthrough
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[{"type":"text","content":"HANGZHOU, China, Feb. 12, 2026 /PRNewswire/ -- As energy storage systems (ESS) are increasingly deployed in commercial centers and residential neighborhoods, noise levels have become a critical factor for project approval. Hoymiles' HoyUltra 2, the liquid-cooling C&I battery system, has achieved ≤60 dB noise level certification in a recent noise evaluation test conducted according to the international ISO 3744:2010 standard by the Zhejiang Electric Safety and Quality Inspection Center. While the industry average is 65–75 dB, the breakthrough ≤60 dB certification of HoyUltra 2 sets it as one of the quietest in the industry.","length":648,"tagName":"p"},{"type":"text","content":"The gold standard of silence","length":28,"tagName":"p"},{"type":"text","content":"Unlike tests conducted in noisy industrial environments, the HoyUltra 2 was tested in a professional semi-anechoic chamber with a background noise level of just 24 dB—quieter than a bedroom at night.","length":199,"tagName":"p"},{"type":"text","content":"The evaluation covered the system's entire operational cycle, including full-power charging and discharging. The results confirmed that even under maximum load, the noise remains consistently low and stable, free from mechanical hums.","length":238,"tagName":"p"},{"type":"text","content":"Seamless urban integration","length":26,"tagName":"p"},{"type":"text","content":"At the overall A-weighted sound pressure level of 47.4 dB(A), the operating volume of the HoyUltra 2 is comparable to a quiet library. This is a significant leap from traditional ESS units, which typically operate between 65–75 dB.","length":231,"tagName":"p"},{"type":"text","content":"This breakthrough allows the HoyUltra 2 to blend seamlessly into noise-sensitive environments, such as:","length":103,"tagName":"p"},{"type":"list","items":[{"val":[{"type":"text","content":"Commercial business districts","length":29,"tagName":"p"}]},{"val":[{"type":"text","content":"Industrial parks","length":16,"tagName":"p"}]},{"val":[{"type":"text","content":"Residential communities","length":23,"tagName":"p"}]}],"tagName":"ul","bulletedList":true,"length":68,"olType":false},{"type":"text","content":"Innovative liquid-cooling engineering behind the low decibels","length":61,"tagName":"p"},{"type":"text","content":"The silence of the HoyUltra 2 is a resul...