APC Back-UPS ES 550VA Desktop UPS – 550 VA Standby UPS Battery Backup

Overview

The APC Back‑UPS ES BE550G is a 550 VA / 330 W uninterruptible power supply (UPS) designed for basic battery backup and surge protection in home office or small business environments. It maintains continuity for connected electronics during brief power outages and mitigates spikes and sags that can disrupt or damage equipment.

This UPS uses standby (offline) topology with a stepped approximation to sine wave output and a typical transfer time of ~8 ms, switching to battery power when utility voltage falls outside acceptable ranges.

Physical outlets include a mix of battery‑backup plus surge‑protected receptacles and surge‑only outlets, allowing critical devices to remain operational while non‑critical loads are protected against transient events.

The internal sealed, maintenance‑free lead‑acid battery offers backup runtime adequate for safe shutdown of systems or short‑term continuation of operation, with full recharge typically requiring up to 24 hours.

Indicators on the UPS provide visual and audible feedback for utility power status, battery mode, and fault conditions, supporting simple monitoring without additional management interfaces.

This unit is not a standalone power source and must be installed with connected loads to function as designed; it cannot power devices independently of a mains connection and battery unit.

Key Features

• 550 VA / 330 W capacity with standby UPS topology
• 8 × NEMA 5‑15R outlets (4 battery + surge, 4 surge‑only)
• LED status indicators and audible alarms
• Maintenance‑free sealed lead‑acid battery
• Adjustable voltage sensitivity for local power conditions