Fox ESS Achieves Record Energy Storage Efficiency
Renewable energy company Fox ESS has set a new global benchmark by achieving a record 97% energy storage efficiency. The milestone, measured by the HTW system performance index, is a significant leap for the industry. This level of efficiency could enable smaller and more resilient distributed energy systems for grid-edge and smart home applications.
The 97% System Performance Index (SPI) achieved by Fox ESS was recorded in the 10 kW DC category of the "Energy Storage Inspection," a rigorous annual assessment by HTW Berlin. This SPI is a measure of the overall efficiency of a photovoltaic (PV) battery system, accounting for energy losses during conversion and storage. Fox ESS's system was noted for its high average efficiency of 97.6% and a minimal standby power consumption of just four watts. The record-setting system comprised the PQ-H3-Ultra-10.0 inverter paired with the EQ3300-5 battery. This achievement surpasses the company's previous year's performance, where its H3 Hybrid Inverter and ECS system received an A-Class rating with a 94.8% performance index in the same 10 kW test. The latest report evaluated 12 systems, with Fox ESS securing the top position in its category. This advancement comes from a company founded in 2019 that has rapidly expanded its global presence. Fox ESS, a part of the Tsingshan Group, a major steel and nickel producer, operates an R&D center in Wuxi, China, with hundreds of engineers. The company has installed over 890,000 PV inverters and more than 1 million batteries in over 70 countries. The achievement solidifies Fox ESS's market position, having recently been ranked as the No. 1 market share leader in Europe by the S&P Global Energy Residential Storage Index. In 2023, the company also appeared on Forbes's "Unicorn List." Its key competitors in the broader energy storage market include established names like Tesla, BYD, LG Energy Solution, and Samsung SDI. Higher efficiency in energy storage systems directly translates to less wasted energy. For homeowners and businesses, this means maximizing the electricity generated from their solar panels and reducing reliance on the grid. This is particularly crucial for creating resilient microgrids that can operate independently during power outages. The HTW Berlin "Energy Storage Inspection" is considered a key European benchmark for PV storage system efficiency. The SPI metric provides a standardized way to compare complex systems, evaluating them under practical conditions to offer credible, third-party guidance for consumers. Several other manufacturers, including RCT Power, Energy Depot, and Fronius, also achieved the top "A" efficiency class with scores above 95%.
