Applications: Stationary Energy Storage

AC vs. DC-block Two competing architectures for battery enclosure have been rising within the BESS industry.

AC Block

DC Block

PCS is pre-integrated into a single enclosure that outputs AC power directly

The enclosure outputs DC power which feeds an external PCS (bi-directional inverter)

Battery Block

Battery Block

PCS

PCS

Pros:

Simpler and quicker installation

PCS included in the product warranty and easier O&M

Simplified control system

Trends:

Gaining market share in EU and US market due to design benefits.

Teslaʼs Megablock advances MV AC block trend for 2026.

Source: Nor-Cal Controls, Saur Energy, LinkedIn - Drew Lebowitz, Fluence, Energy Storage News

Pros:

Flexibility to size the PCS

Lower upfront cost (per-kWh)

Allows for third party EMS implementation

Trends:

Preferred solution in solar+storage hybridation projects.

Leads the energy density race at block level into 2026.

Extracted from the PDF; charts and images may read imperfectly.