Online Monitoring and Offline Discharge: How to Use the Two Major Functions of HZFD-200?

Some battery testers on the market can only perform "capacity verification discharge," requiring the battery to be disconnected from the system for testing, while others only support online monitoring without assessing actual capacity. The HZFD-200 integrates both functions into a single device, covering the main scenarios of battery lifecycle management.

Online Monitoring: Real-time Status Tracking Without Battery Disconnection

Online monitoring refers to the real-time collection and display of the following data by the instrument while the battery bank remains connected to the DC system (in a float charge, equalization charge, or discharge state)

The entire set of voltage and charge/discharge current

The terminal voltage of each single cell (maximum 240 cells monitored)

The cumulative values of charging capacity and discharging capacity for the entire group

Monitoring duration

This mode is particularly suitable for the following scenarios: assessing the capacity discharged by the battery after an accident; monitoring whether the voltage of individual cells is uniform during equalization charging; and continuously tracking and recording the battery status without affecting normal power supply.

Identify which cell has low or high voltage (the minimum and maximum values are highlighted in red and blue on the interface). Maintenance personnel can then address the underperforming cells specifically, rather than waiting until the entire group fails to detect the issue.

Offline discharge test: the sole accurate method for capacity verification

Offline discharge (discharge testing) involves disconnecting the battery pack from the system and connecting it to the HZFD-200 smart dummy load for constant current or constant power discharge. This is the only accurate method to verify the actual capacity of the battery—online monitoring can detect voltage deviations in individual cells but cannot directly measure the remaining capacity in ampere-hours.

Discharge parameters can be flexibly configured: discharge current (constant current mode) or discharge power (constant power mode), discharge hour rate (selectable from 0.5 to 10H), full-group termination voltage, single-cell termination voltage, maximum discharge time, and maximum discharge capacity. Discharge can be stopped if any termination condition is met or via manual operation.

The two functions can be switched on demand, with routine online monitoring during normal operation and periodic (typically annual or biennial) capacity verification discharge tests, collectively forming a comprehensive battery health management system.