Suntech promoted its SunStorage Home series residential ESS with 4-20 kW/6-54kWh rated capacity at the show
The company also displayed its C&I ESS, SunStorage Pro, with AC- and DC-coupled configurations, with a rated capacity of 125 kW/261 kWh
The DC-coupled ESS features an external hybrid inverter with a capacity range of 25 to 125 kW
Wuxi Suntech Power Co., Ltd., a well-known PV cell and module maker that recently expanded into the energy storage system (ESS) and inverter space, introduced its application-specific ESS lineup at Intersolar Europe 2026.
Targeted at residential applications, the company’s latest SunStorage Home series features a range of models with varied full-load power ratings and storage capacities. This product consists of a hybrid inverter, which is AC-coupled to an external battery bank and rooftop PV array (existing or new). Consumers can select a model within a full-load power range of 4 to 20 kW, with a corresponding storage capacity range of 6 to 54 kWh, configurable to match power demand, backup duration, PV array capacity, and sanctioned loads.
This system’s integrated energy management system (EMS) automatically performs all the required real-time functions according to the user-defined or default process flow. To maximize PV self-consumption, it diverts excess clean generation to battery storage after feeding captive loads, preventing export to the grid. It switches the inverter to off-grid mode within milliseconds of a grid outage and delivers emergency backup power at full-load rating until the battery reaches its cut-off voltage limit. It can also schedule battery charging or discharging according to the electricity tariff pattern (daily), known as a Time-of-Use (ToU) tariff. Here, the battery charges when the tariffs are low, while it discharges after the rate recovers and maintains it throughout pre-fixed time slots.
Unlike power- and storage-based classification, the company’s commercial & industrial (C&I) ESSs under the SunStorage Pro brand are differentiated by the types of coupling between the grid and PV. Its integrated version, with 261 kWh storage capacity and a 125 kW bidirectional power conversion system (PCS), is AC-coupled to the grid and an existing or new on-site PV array. In contrast, another model consists of 261 kWh of storage capacity without a PCS. Its storage capacity and PV array are directly connected to an external hybrid inverter via a common DC busbar. This direct coupling, without an intermediate inverter or converter between the battery and PV array, improves PV harvesting and battery charging compared to an AC-coupling alternative. According to the company, its hybrid inverter has a full-load power range of 25 to 125 kW and supports 2- and 4-hour storage configurations.
On the operations side, it supports a variety of grid-interactive energy management functions, including peak shaving and valley filling for daily energy cost optimization, and PV + storage integration, among others. It can also support emergency backup during a grid outage.
A cloud platform enables remote monitoring and control via a monitor or mobile device. This platform also provides a real-time visualization of the system and helps users access and analyze historical data.
