Model Number: BAK HESS-01 3KVA/6KWH Brand Name: HBAK Key Specifications/Special Features: DC output technical data sheetNominal voltage specification: 51.2V DCOperating voltage range (battery voltage during normaloperating) 40-64V (51.2V DC power)Low-voltage warning (when the battery voltage is too low, the buzzer rings to alert users) 42.0± 1.2V DCLow-voltage power-off (shut down when battery voltage is too low) 40.0± 1.2V DCLow-voltage recovery (automatically power on when the battery voltage returns to normal) 48.0± 0.3V DCHigh-voltage warning and power-off (when the batteryvoltage is too high, the buzzer rings, and the systempower off) 60± 1.2V DC