Author: Site Editor Publish Time: 2024-11-26 Origin: Site
The actual discharge capacity of batteries that have been operating under float-charge conditions for extended periods is often unclear. Relying solely on conventional capacity testing methods provides limited accuracy. While changes in battery voltage and internal resistance can partially indicate capacity degradation, these parameters are not definitive metrics for measuring battery capacity.
The only reliable solution is to periodically conduct capacity testing through controlled charge-discharge cycles. This ensures that batteries operate at no less than 80% of their capacity, meeting the requirements of DC loads during AC power outages and identifying potential battery issues. This is a critical element of DC power system reliability.
DFUN Battery Bank Capacity Testing Solution integrates multiple functions, including remote online monitoring, capacity discharge testing, segmented intelligent charging, intelligent battery operation and maintenance, battery balancing and activation. It is suitable for DC power systems such as telecom power supplies (48V) and operational power supplies (110 & 220V).
Building on years of technical expertise and application in DC power systems, DFUN has developed the real-time online battery bank capacity testing systems. A key innovation is the introduction of a Discharge Protection Unit, enabling capacity testing to be conducted under safeguarded conditions.
The discharge protection unit consists of a unidirectional diode and a normally closed contactor connected in parallel and then inserted into the battery supply circuit. During capacity testing, the diode ensures that charging stops while discharging continues. This prevents the charging device from supplying current to the battery bank, placing the battery bank in a hot standby state (real-time online). Regardless of the operational status of the capacity testing system, the battery bank remains online. In the event of a failure in the charging device or AC system, the battery bank instantly supplies power to the DC load.
Remote Online Capacity Testing System for Telecom Power Supplies (48V)
Remote Online Capacity Testing System for Operational Power Supplies (110V & 220V)
K1 remains closed, connecting the battery bank with the DC bus/charging device.
The battery bank can both charge and discharge. If the AC system/charging device fails, the battery bank provides real-time power to the DC load.
Telecom Power Supplies (48V)
K1 Open, KM Closed: The battery discharges via the DC/DC step-up discharge unit and connects to the DC bus. During this state, the output voltage of the capacity testing system is higher than the DC power supply voltage, ensuring that the load is powered by the capacity testing system (battery bank). The diode (D1) circuit stops charging, enabling discharge.
Operational Power Supplies (110V & 220V)
K1 Open, K11 Closed: The battery bank discharges through the PCS inverter, feeding energy back to the AC grid. The diode (D1) circuit stops charging, enabling discharge.
In both types of systems, the discharge protection unit (K/D) ensures that even if faults occur in the AC system, charging device, or capacity testing system, the battery bank remains capable of supplying real-time power to the DC load. This immediate responsiveness satisfies emergency power demands in extreme scenarios.
By integrating the discharge protection unit (K/D) into the battery supply circuit, the system ensures an uninterrupted power supply from the battery bank during periodic capacity discharge testing. This enhances the safety and reliability of DC power systems, providing robust security for critical operations.
