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SAJ showcased the EK90 HS5 series ESS at the show
The system supports up to 20 kW of PV input and expandable battery capacities from 10 kWh to 54 kWh using built-in DC-DC optimizers
The company highlighted the ESS’s DC and AI-assisted AFCI protection features
Guangzhou Sanjing Electric, or SAJ, a residential and commercial & industrial (C&I) energy storage system (ESS) manufacturer, showcased its latest residential ESS, the EK90 HS5, at Intersolar Europe 2026. The product was also featured in TaiyangNews’ live coverage of Intersolar Europe 2026 (see Live Blog - TaiyangNews Live from The smarter E / Intersolar Europe 2026).
The product is classified as an ‘All-in-One’ ESS that integrates a hybrid inverter on top, followed by vertically stacked battery packs and an AI-assisted energy management system (EMS). This system is equipped with 314 Ah lithium-iron-phosphate (LFP) cells and boasts a storage capacity of up to 9 kWh. According to the company, each battery has a guaranteed life of up to 12,000 cycles. The system’s storage capacity can reach 54 kWh when up to 6 packs are stacked on top of one another via its blind-mate connectors, without any external cabling. Unlike a centralized DC busbar, its DC-DC optimizer maintains the DC bus voltage within a tolerable range, enabling the use of both old and new batteries. Its inverter can support a PV array of up to 20 kW and switches between on- and off-grid mode within 10 ms of a grid outage. The system (54 kWh) is rated for a full-load power of 10 kW and a current of 43.5 A in on-grid mode, and can deliver up to 10 kW of emergency backup power in off-grid mode.
In terms of battery safety, it features metal canister-based aerosol-forming compounds that generate a fine aerosol that suppresses fire inside the battery cabinet. It is also equipped with a real-time temperature-monitoring function and a pressure-release valve to vent excess pressure generated during a fire. On the system side, the PV ground-fault function monitors the insulation resistance (IR) value of the connected PV array to check for ground leakage. Its AI-assisted arc-fault circuit interrupter (AFCI) function activates when it detects a localized electric arc, whether from defective PV modules or the array.
This ESS is scheduled to become available in the German market from October 2026.
