This reference design is a high-voltage, current and insulation impedance accuracy lithium-ion (Li-ion), LiFePO₄ battery rack. The design monitors four high-voltage bus inputs, one shunt current and temperature, and one insulation impedance of the battery. The design protects the battery rack to maintain safe operation. The design provides an onboard serial peripheral interface (SPI) and off-board daisy-chain communication interface, allowing for a cost-effective stackable connection and reinforced isolation. These features make this reference design applicable for high-capacity battery rack applications.