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Sungrow’s latest PowerKeeper series ESS provides 3-phase emergency backup of up to 125 kW within 10 ms of a grid outage
Apart from the backup function, it offers grid ancillary services, like energy arbitrage, frequency support, and demand control by using embedded AI algorithms
The ESS is designed to withstand water immersion of up to 50 cm without failure
Sungrow, a PV inverter and energy storage system (ESS) provider, showcased its latest PowerKeeper series hybrid storage system for C&I applications at SNEC 2026.
This storage system comprises a SH50-125CX series 3-phase hybrid inverter, ST050-250CF series battery units, and a datalogger (Logger1000) for data acquisition. The hybrid inverter (SH 125CX), with 10 MPPT channels at 40 A each, can handle up to 250 kW of PV capacity. This is a 200% DC/AC oversizing compared to its rated full-load output (AC) of 125 kW, facilitating maximum DC capacity availability throughout the day. Apart from maximizing solar harvesting, the inverter is designed to support LFP battery stacks with a maximum charging/discharging power of 125 kW to store excess PV generation. This stored energy delivers up to 125 kW of emergency backup power within 10 ms of a grid outage. At the same time, it supports up to 150% overload of the rated full-load capacity for up to 10 seconds, maintaining uninterrupted operation of inductive C&I loads, such as pumps and motors.
On the storage side, each ST050CF series battery unit is equipped with 4 vertically stacked 12.5 kWh LFP battery packs, for a cumulative storage capacity of 50 kWh. It can be expanded to up to 250 kWh, with a corresponding DC power (charging/discharging) of 125 kW, by connecting up to 5 battery units in series. It can accomplish emergency backup for up to 2 hours via the 125 kW hybrid inverter during a grid outage. According to the company, the backup duration can be up to 8 hours when 3 additional 250 kWh units (5 × 50 kWh) are connected in parallel via a battery junction box and placed back-to-back or in a linear configuration.
From an operational perspective, it can generate optimal energy dispatch strategies using the embedded AI algorithm, facilitating multiple ancillary services, such as energy arbitrage, frequency support (FCAS), and demand control.
This system is housed in an enclosure with an ingress protection rating of IP66 and can withstand water immersion of up to 50 cm, as verified by a built-in immersion sensor, Sungrow claimed. Other safety features include 5D alert (full-stack temperature, immersion, voltage, current, and smoke) and triple-guard protection (cell-to-plant safety).
This product is commercially available, primarily targeting the South East and Middle East markets.
