July 2025
In January 2025, SED conducted a statewide survey of grid-scale battery energy storage systems (BESS) to gather data on system configurations, technical properties, safety practices,
The system is built of two main blocks. The PCS building block, responsible for the main control of the mobile BESS. The nominal power rating of the PCS block is 225 kVA, with a maximum peak power in the peak shaving mode of 275 kW . The second block is the modular battery pack.
The mobility and flexibility of the system enables novel applications and deployments where BESS previously were unused due to the non-flexible solutions. The system is modular, meaning that the energy storage capacity can be quickly adapted depending on the application case, in contrast to larger and bulkier solutions.
On July 17, 2024, the Board of Supervisors directed staff to create rules for privately initiated Battery Energy Storage System (BESS) projects in the unincorporated area. In response to this direction, the County is taking steps to guide the safe and responsible growth of Battery Energy Storage Systems (BESS).
The simplification therefore gives an easy Single Line Diagram (SLD) of the BESS topology as shown in Figure 4.2. Starting from the left, the important battery device, which represents the storage capability and technology of the BESS DER. The battery is then DC coupled through a bus to a PCS, representing inverter capabilities of the DER.
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