WHES showcased its latest 125 kW/261 kWh C&I ESS, P3-G3, for grid ancillary services
This ESS’s rated backup can be flexibly adjusted between 2-, 4-, and 8-hour periods by connecting 4 units in a DC parallel configuration
According to the company, its upcoming ESS, hybrid PC-G3, can deliver emergency backup within 10 ms of a grid outage, while maintaining grid market participation
WHES, a China-based PV inverter and energy storage system (ESS) provider, introduced its upcoming and commercially available ESS lineup for commercial & industrial (C&I) consumers at Intersolar Europe 2026.
These products are differentiated by automatic energy dispatching, energy management, and market participation capabilities.
The company promoted its P3-G3 ESS for grid ancillary services that generate passive revenues, such as Frequency Containment Reserve (FCR), automatic Frequency Restoration Reserve (aFRR), spot price arbitrage, and demand response across European markets. FCR is a function that balances grid frequency during imbalances between production and use in the power system. These are also known as primary reserves. The aFRR service must be scheduled one day prior to activation. Energy arbitrage is a function that automatically commands the battery to charge during negative spot electricity hours and discharge for the power spot market at high prices.
The ESS’s energy operating system (OS), WHES OS 2.0, monitors and controls these complex, real-time, grid-interactive operations. This OS, embedded with AI algorithms, automatically analyzes spot electricity price forecasts, the consumer’s load and PV generation projections, and regional electricity market rules at 15-minute intervals. Based on this analysis, the platform generates and optimizes operational strategies by leveraging an embedded AI agent. According to the company, this OS supports participation in the regional virtual power plant (VPP) market and dispatches stored energy to the virtual pool.
In terms of product performance, this ESS is equipped with 5 lithium-iron-phosphate (LFP) battery packs, each rated at 52.25 kWh, with a cumulative storage capacity of 261 kWh. This capacity is charged or discharged from or to the grid via its built-in bidirectional 125 kW power conversion system (PCS). Therefore, this 125 kW/261 kWh ESS is designed to deliver power backup for up to 2 hours or until the battery cut-off voltage is reached. This AC-coupled system can be configured for higher backup periods of 4 or 8 hours by connecting 4 units in parallel on the DC side to form a 125 kW/1,044 kWh ESS platform. On capacity flexibility, up to 24 units can be AC-parallelled, making a 3 MW cluster. The company noted that its upcoming hybrid PC-G3 variant switches to emergency backup mode within 10 ms of a grid blackout. At the same time, the system can withstand a short overload of up to 150% of rated full-load capacity; however, the company did not disclose the duration.
For real-time thermal regulation, its storage is cooled via a circulating liquid coolant, while the PCS uses natural air cooling. This leads to an operational noise level of <65 dB. For safety, the ESS features smoke, heat, and flammable gas sensors for 24/7 monitoring and protection against thermal runaway propagation to neighboring cells. If a fire fills the ESS cabinet with smoke, the smoke sensors send a fault signal to the battery management system (BMS). It then activates the aerosol-based chambers, which release fine aerosol clouds inside the affected battery pack to suppress the fire. Each cell is placed with intermediate aerogel-based layers for cell-to-cell thermal isolation. According to the company, these systems are designed to perform within a range of ambient temperature of -30 to +55°C. However, the cells start to derate above 45°C.
The company also showcased its liquid-cooled 2- to 8-hour backup-based PC-G2 series C&I ESS for fast frequency response and modular capacity expansion. For peak shaving and demand response applications, WHES displayed its PC-G1 series product, while the PC-mini is tailored for off-grid and weak-grid connections. These ESSs are commercially available.
