Acrel UPS Monitoring System: Safeguarding Your Power Continuity and Reliability

22 12, 2025

What is a UPS?

UPS (Uninterruptible Power Supply) is an emergency power supply device that integrates power conversion, energy storage, and control functions – a comprehensive power protection system incorporating rectifiers, inverters, batteries, static switches, and control circuits.

Its core functionality comprises two key aspects:

First, when utility power is normal, it filters out grid disturbances such as voltage fluctuations, surges, and harmonics, delivering stable and clean power to loads.

Second, upon utility power failure, it seamlessly switches to battery-stored energy (online UPS switching time <10ms) to prevent load equipment from crashing and data from being lost.

Critical Clarification: A UPS ≠ Just a Battery! The battery is merely the "energy storage component," responsible only for storing electrical energy. A complete UPS system requires coordinated operation of core modules including rectification, inversion, and switching to fulfill its power protection mission.

Mainstream UPS Topologies and Key Differences:

• Online UPS: Powers loads continuously through the inverter with zero transfer time, delivering the highest power quality. Ideal for critical applications such as industrial control, medical facilities, and data centers (core target scenarios).

Online UPS supplies load AC power through the inverter circuit regardless of grid voltage status, keeping the inverter always operational. During outages, it immediately converts stored battery energy into AC power for the load, achieving zero-interruption transfer.

• Standby UPS: Directly supplies utility power under normal conditions, activating the inverter only during outages with tens-of-milliseconds transfer time. Suitable for non-critical loads like computers and routers.

1. Charger: Charges and float-charges the battery during normal utility operation.
2. DC/AC Inverter: Remains inactive when utility is present; during outages, converts DC power (from battery) into AC power for loads, with output waveforms including square wave, quasi-square wave, or sine wave.
3. Transfer Switch: Connects input power to loads during normal operation; disconnects utility and connects inverter during outages to continue powering loads.
4. Automatic Voltage Regulator: Regulates and stabilizes output voltage when utility is present.

• Line-Interactive UPS: Provides partial voltage regulation with transfer time between online and standby types. Suitable for small office environments.

During normal utility operation, it supplies improved utility power to loads through intelligent tap-changing transformer regulation, while the inverter works in reverse mode to charge the battery. During outages, loads are entirely powered by battery energy through the inverter. This bidirectional converter functions as both inverter and charger.

Acrel Solutions:

Battery Monitoring

• 24/7 online monitoring for early detection of performance-degraded cells
• Three voltage ranges available: 2V, 6V, 12V configurations to accommodate most battery types
• Per-cell monitoring of voltage, internal resistance, and negative electrode temperature
• Plug-and-play installation – simple pole-to-pole wiring requires no specialized training

• 24/7 online monitoring of charge/discharge current and ambient temperature
• Features optical isolation and MODBUS protocol support for seamless integration with third-party monitoring systems
• Delivers high reliability and stable performance

DC Meters