ROBESTEC displayed its 125 kW/261 kWh C&I ESS, Enprime-S Plus 261, for PV self-consumption and emergency backup, among others
The company also promoted its 20 ft container-based Enprime-C-Plus series utility BESS
This collocated product, when embedded with the company’s latest AI-enabled energy management platform, generates revenue by participating in energy trading and grid ancillary markets
A China-based energy storage system (ESS) maker, ROBESTEC, featured a commercial & industrial (C&I) ESS, Enprime-S Plus 261, and a containerized battery energy storage system (BESS), Enprime-C-Plus, at Intersolar Europe 2026.
These products are aimed at Europe’s collocated PV + storage projects, turning renewable energy (RE) assets into operational revenue-generating tools rather than low-value energy assets.
The Enprime-S Plus 261 series C&I ESS consists of 5 lithium iron phosphate (LFP) battery banks, each rated at 52.24 kWh and stacked on top of one another, for a cumulative storage capacity of 261 kWh. In addition to storage, it includes an energy management system (EMS), battery management system (BMS), and a 125 kW power conversion system (PCS) in a 994 × 1,350 × 2,320.5 mm (W × D × H) cabinet. This PCS has a maximum conversion efficiency of more than 99%. In the event of a grid outage or grid-interactive energy management services, this system is designed to deliver up to 125 kW full-load power (3-phase) at a 0.5C rate for approximately 2 hours or until the battery cut-off limit is reached. It also maintains the same maximum full-load power and rate when charging the storage with excess PV generation, while the remainder is filled by the grid. This maximizes PV self-consumption and improves the value of RE assets by avoiding exports at negative grid tariffs. According to the product datasheet, it is rated for up to 137.5 kW overload capacity; however, the duration was not specified.
The company promoted its Enprime-C-Plus series utility BESS for MWh-level storage capacities. Its 20 ft container, measuring 6,058 × 2,438 × 2,896 mm, consists of 8 battery racks, each with 4 battery packs, for a storage capacity of up to 6.25 MWh. The system’s maximum backup period at the rated full-load power and at a 0.5C rate depends on the external PCS’s capacity.
Unlike the former user-side storage system, this system is coupled with MW-scale PV arrays on the utility grid side to participate in the spot energy arbitrage market and grid ancillary services. Its integrated EMS, with the company’s latest embedded AI-enabled operational revenue platform, automatically diverts PV generation beyond the real-time grid demand to the BESS, avoiding curtailment. Using AI algorithms, the platform also analyzes PV generation forecasts, dynamic spot market price trends, and grid demand patterns to accurately predict negative tariff periods and divert PV generation to storage. This dispatchable clean energy is discharged to the grid when it recovers its tariff rate, enabling energy arbitrage and generating revenues for BESS owners.
In addition to participating in the open power market, this BESS is designed for grid ancillary markets, including frequency regulation, RE smoothing, grid-level peak shaving, and load balancing. In an unstable grid with frequent frequency changes, its external PCS acts as a voltage source by switching to grid-forming mode. This helps form frequency and voltage at the individual plant level, rather than following the regional grid. In the absence of any rotational mass-based inertia support, typically common in thermal power-plant-based grids, it enables fast switching of power electronics components. This attribute provides synthetic inertia that injects – or absorbs – active power to the grid in proportion to the rate of change of grid frequency and stabilizes an unstable grid. This PCS can also inject clean storage energy in a deep cycle of active power for a duration that matches grid-side demand overshooting compared to the scheduled load profile. This kind of peak shaving helps maintain grid stability.
Both products feature a circulating liquid-coolant-based system to maintain real-time state-of-charge (SoC) at an equilibrium. According to the company, the C&I ESS can hold cell-to-cell temperature variance within 3°C.
In case of thermal runaways, their built-in sensor is activated by smoke from inside the cabinet or container and sends a fault signal to aerosol-based chambers. These chambers then release fine aerosol clouds that suppress the fire by chemically reacting with smoke. After that, water is sprayed inside the cabinet or container to cool the affected battery pack or cells, preventing fire reignition.
