Targi Kielce Energy Storage System, Poland

Project Overview

The Targi Kielce exhibition center in Poland required a high-power commercial and industrial energy storage system capable of coordinating multiple power sources. EENOVANCE delivered a FlexCore Series solution combining a 500 kW bidirectional PCS cabinet, four 261 kWh battery cabinets (1,044 kWh total), a 240 kW MPPT cabinet for PV conversion, and an STS cabinet for fast source transfer — with a diesel generator integrated as a long-duration backup source.

Challenge

Large exhibition and event venues face rapidly changing electrical demand — from normal building loads to short-duration peaks driven by halls, lighting, HVAC, catering, AV systems and event equipment. The site needed a power system that could:

1. Maintain uninterrupted supply to priority loads during grid disturbances — power continuity is non-negotiable for events.
2. Coordinate multiple sources (grid, PV, battery, diesel generator) as one architecture rather than isolated systems.
3. Absorb and shift solar energy, using PV production efficiently instead of treating the solar plant and battery as separate assets.
4. Stay modular and serviceable, so each subsystem could be maintained, monitored and expanded independently.

The core design principle: keep critical electrical functions coordinated, fast and modular — instead of relying on a single source or a single operating mode.

Solution

EENOVANCE adopted an AC-coupled power architecture to modularise PV conversion, battery storage and on-site power switching. The EMS coordinates the subsystems and defines the timing for energy storage, load supply, grid export and backup activation from alternative power sources.

• 500 kW PCS cabinet — the power-control core. In grid-connected mode it controls power flow between the AC bus and the battery; in off-grid mode it establishes and supports the site-side AC supply. Its 500 kW rating is coherently matched with the battery block's ~522 kW power envelope (0.5P per cabinet).
• 4 × 261 kWh battery cabinets — a 1,044 kWh energy block with intelligent liquid cooling, coordinated battery management, and modular design for protection, monitoring and maintenance as a cluster.
• 240 kW MPPT cabinet — converts PV generation into the storage architecture, operating the array at maximum power point and routing surplus energy into the battery.
• STS cabinet — provides fast (< 20 ms), controlled source transfer between grid, battery and the connected diesel generator, turning multiple energy sources into one coordinated backup strategy.

Operating logic: PV generation supplies loads first; surplus energy charges the battery; the battery discharges through the PCS during high-demand or low-PV periods; during grid disturbances the STS coordinates source transfer while the PCS provides fast battery-based response, with the diesel generator available for extended interruptions.

The platform complies with IEC 62477 / IEC 62109 / IEC 61439 (electrical cabinet) and UN38.3 / IEC 62619 / IEC 63056 / IEC 62930 / IEC 61980 (battery cabinet).

Results

The system delivers a complete power platform — not just a battery — providing layered value for the venue:

1. Fast response + multiple sources: Sub-20 ms switching parameter + 500 kW PCS + connected diesel generator creates a layered resilience strategy.
2. High energy reserve: 1,044 kWh of installed battery energy provides meaningful duration for load support while preserving modularity.
3. Scalable architecture: FlexCore is positioned as a modular 125 kW-1 MW / 261-2088 kWh platform, so the architecture can evolve with site requirements.
4. Integrated PV + storage: The 240 kW MPPT cabinet directly connects the PV generation strategy with the storage system.
5. Thermal and safety design: The datasheet identifies intelligent liquid cooling for battery cabinets, intelligent air cooling for the electrical cabinet, IP54, and multi-level protection / alarm functions.
6. Standards-oriented platform: The datasheet lists IEC 62477 / IEC 62109 / IEC 61439 for the electrical cabinet and UN38.3 / IEC 62619 / IEC 63056 / IEC 62930 / IEC 61980 for the battery cabinet.

The Targi Kielce project demonstrates the strength of the FlexCore Series for complex commercial facilities where continuity of electrical service matters as much as energy efficiency — the system can work with the grid, store and shift energy, support high-power loads, react quickly to outages, and retain generator support for extended interruptions.