Case Study: Industrial Profitability in Bulgaria – 50kW / 120kWh Air-Cooled BESS for a Local Enterprise

Pioneering the Balkan Energy Transition

As Bulgaria rapidly scales its renewable energy capacity to meet EU Green Deal targets, energy storage has become the "missing link" for industrial stability. Suness Power has successfully deployed a high-performance 50kW / 120kWh Liquid-Cooled Outdoor BESS for a commercial client in Bulgaria, designed to tackle rising energy costs and grid constraints.

This project features a unique "External Inverter + Integrated Battery Cabinet" design, combining the industry-leading Solis 50kW Hybrid Inverter with Suness Power’s advanced air-cooled lithium technology.

Technical Configuration: Precision Engineering

The system is optimized for high-frequency cycling, ensuring the longest possible service life in the variable Bulgarian climate.

Strategic Project Highlights

Solis 50kW Integration: Reliability Meets Flexibility

By selecting a Solis 50kW Three-Phase Hybrid Inverter, we ensured maximum compatibility with the European grid. The External Inverter Design offers two major advantages for the Bulgarian market:

Superior Cooling: Separating the power electronics from the battery cabinet prevents heat interference, maximizing the efficiency of both components.

Maintenance Simplicity: Local technicians can easily access the inverter for routine checks or firmware updates without disturbing the high-voltage battery environment.

314Ah Air-Cooled Technology: The Durability King

This project utilizes 314Ah high-capacity cells—the latest standard in utility-grade storage. To protect this investment, we implemented a Air Cooling Loop.

Life Extension: By maintaining cell temperatures within a tight ±2°C range, we significantly reduce degradation, allowing for 6,000+ cycles.

Strategic "Arbitrage" for Bulgarian Businesses

Bulgaria’s wholesale electricity market (IBEX) experience significant price volatility. Our 120kWh storage bank allows the client to:

Charge at Low Cost: Absorb energy from the grid or solar array during low-price windows.

Discharge at Peak: Power the facility during expensive peak hours, insulating the business from price spikes and delivering a faster ROI.

The Bulgarian Outlook: Why Now?

Government Grants: This system is perfectly sized to qualify for Bulgaria’s National Recovery and Resilience Plan (NRRP) grants, which fund up to 50% of energy storage investments.

Grid Stabilization: As more solar farms come online in Bulgaria, businesses with on-site storage are rewarded with a more stable power supply and lower "balancing" costs.