Bulgaria PV-Storage System — 100kW/215kWh ESS

Project overview

In Bulgaria, a DC-coupled photovoltaic plus energy storage system was deployed with 100 kW / 215 kWh of storage. The case record describes four supported application modes enabled based on the customer’s actual circumstances: self-consumption with conditional surplus sale, self-consumption with surplus blocked, peak shaving and valley filling via price differentials, and off-grid backup during grid failures.

Applications at this site

• • Self-consumption with surplus sale (conditional on grid-metering settings)
  • Self-consumption with surplus blocked
  • Peak shaving and valley filling via price differentials

• Off-grid backup during grid failures

Installed capacity

• Energy storage: 100 kW / 215 kWh
• PV controllers: 3 MPPT photovoltaic controllers
• Transfer: 2 × 200 kVA static transfer switches (STS)

Project advantages

• Mode flexibility: four application modes, each enabled based on the customer’s actual circumstances.
• Backup capability: off-grid mode provides power during grid failures.
• Peak management: price-differential control supports peak shaving and valley filling.