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▪
Fan control connectors with breaker switch
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Power In connector with breaker switch
▪
Status LEDs (Power, Activity, and Fault)
▪
Earth bonding connection (grounding stud)
3.2. Features
The Nuvation Energy Stack Switchgear internally includes the following major hardware components:
▪
Nuvation Energy High-Voltage Stack Controller
▪
Nuvation Energy High-Voltage Power Interface
▪
Current measuring shunt
▪
Three high-voltage DC contactors
▪
Pre-charge circuit
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Two fuses (short-circuit protection)
▪
Safety relay (for E-Stop)
The following subsections describe the components in more detail.
3.2.1. Stack Controller and Power Interface
The Stack Switchgear contains a single Nuvation Energy High-Voltage Stack Controller and Nuvation
Energy High-Voltage Power Interface.
The Stack Controller has a central MCU which handles processes and decision-making required by the
battery management system. The Power Interface contains a redundant MCU to handle processes and
decision-making required to control the high-current contactors.
The Stack Controller and Power Interface are UL-recognized components, for use in UL 1973
stationary battery energy storage systems. For more information on the capabilities of the Stack
Controller
and
Power
https://www.nuvationenergy.com/technical-resources.
3.2.2. Current Measuring Shunt
A precision current shunt in series with the negative side of the stack is used to measure the stack
charging/discharging current. Current measurement is performed by the Power Interface.
3.2.3. DC Contactors
High-voltage contactors are used by the BMS to connect the battery stack to the DC bus. There are
contactors on both the positive and negative sides of the stack. Nuvation Energy BMS opens the
contactors either by request of an external controller or in fault conditions. A third high-voltage
contactor is used in the pre-charge circuit (see
Document ID: NE-PM-003
Interface
please
refer
Section
Nuvation Energy High-Voltage BMS - Product Manual
to
the
datasheets
3.2.4).
8
available
online
at
Rev 1.2, 2021-03-03
Curie Update 1
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