A UPS—the acronym for Uninterruptible Power Supply—provides power from its batteries when the electrical grid fails or goes outside acceptable limits. Its primary objective is not typically to keep an installation running for hours, but to prevent reboots, data loss, communication interruptions, and abrupt shutdowns. On a computer, for example, it can provide the time necessary to save work and shut down the system; on a router, a camera, or low-power telecommunications equipment, the backup runtime can be considerably longer. The Schneider Electric selection guide highlights three central functions: power continuity, voltage regulation, and protection against specific electrical disturbances.

UPS, Surge Protector, and Stabilizer: They are not the same

Although the terms are often confused, each device addresses a different issue.

Therefore, a UPS can include voltage protection functions, but a conventional surge protector does not replace a UPS. Nor does it substitute grounding, circuit breakers, residual current devices, or surge arresters appropriate for the installation. Schneider Electric explains that a basic surge suppressor acts on electrical spikes, while a Back-UPS adds battery backup and, in specific models, automatic voltage regulation.

APC UPS units available for residential, professional, and business applications primarily utilize two architectures. Line-interactive models incorporate AVR—automatic voltage regulation—to correct certain sags or swells without consuming battery power; they resort to battery power when the input goes outside its operating window or is interrupted. These are suitable for computers, workstations, retail stores, security systems, and small networks. Double-conversion online UPS units, such as the Easy UPS SRV series, normally power the output through the inverter, deliver a pure sine wave, and better isolate the load from an unstable grid. They are recommended for servers, telecommunications, automation, instrumentation, and other higher-criticality applications.

What equipment can be connected?

APC UPS units can protect routers, modems, fiber optic terminals, switches, Wi-Fi access points, IP cameras, DVRs or NVRs, alarms, desktop computers, monitors, graphics workstations, NAS units, televisions, consoles, cash registers, point-of-sale terminals, small servers, and communications equipment. For PLCs, controllers, instruments, or industrial electronics, in addition to power capacity, the waveform, inrush current, compatibility with grounding, and process criticality must be verified. The Mini Back-UPS CP12036LI is a unique case: it delivers 12 V DC and is intended for routers, cameras, and compatible devices; before connecting it, voltage, current, connector type, and polarity must be checked.

It is not recommended to power laser printers, space heaters, electric kettles, ovens, microwaves, air conditioners, refrigerators, pumps, compressors, motors, or power tools from a small UPS. These loads can have power consumptions or inrush currents far exceeding their nominal value. General UPS units should also not be applied to life support equipment or critical medical functions without a specific evaluation and without the product being approved for such use. A laptop already has an internal battery; in that case, it is usually more beneficial to back up the router, modem, monitor, and docking station.

How long does a UPS last during a power outage?

Backup runtime does not depend solely on the VA indicated on the front panel. Both the maximum power in watts and the actual power consumption of the load must be known. A 1000 VA UPS does not necessarily deliver 1000 W: for example, the BV1000I-AR is specified for 1000 VA and 600 W. Additionally, as the load increases, the backup runtime decreases non-linearly. Temperature, age, battery charge level, power factor, and prior cycles also affect the performance. For this reason, Schneider Electric recommends determining the runtime using the corresponding curve and actual power consumption, while also leaving a margin for spikes and future expansions.

The following table summarizes references marketed in Argentina through the APC line presented by Equipel. The runtimes are guidelines, correspond to new and fully charged batteries, and must always be read alongside the indicated load.

Values should not be interpreted as a contractual guarantee of runtime. To select a UPS, it is advisable to measure the actual power consumption, define how many minutes of backup are needed, and consult the curve of the exact model. On Back-UPS Pro models, the LCD screen displays load, battery status, and estimated runtime. Easy UPS SRV models allow for more comprehensive monitoring and, depending on the reference, remote management or expansion via external battery banks. Codes and commercial availability are subject to change and must be confirmed at the time of quoting.

Battery runtime and battery lifespan are different concepts

Battery runtime expresses how many minutes the UPS can power a given load. Lifespan indicates how many years the battery maintains acceptable conditions before requiring replacement. For sealed lead-acid batteries used in many of the Back-UPS and SRV lines, APC indicates a typical lifespan of three to five years under normal conditions. Temperature is decisive: the reference value is near 25 °C and, according to Schneider Electric, each increase of approximately 8 °C can reduce the expected lifespan by half. Frequent deep discharges, failure to recharge, and constant operation near the limit also accelerate wear.

Lithium-ion batteries can reach approximately eight to ten years, depending on the chemistry, temperature, number of cycles, and model. This does not mean they necessarily deliver more minutes of backup: runtime and lifespan remain separate variables. Their advantage relates to a longer service life, lighter weight, and lower replacement frequency. In all cases, a UPS can continue to be used after properly replacing the battery, provided the equipment passes its self-tests and the specified replacement part is installed.

Who needs a UPS?

A UPS is needed by anyone for whom a brief power outage could represent lost work, interrupted communications, loss of records, or service unavailability. Among professional users are engineers, architects, designers, programmers, system administrators, accountants, lawyers, notaries, researchers, photographers, video editors, audiovisual producers, streamers, security operators, telecommunications technicians, and remote workers. In medical or dental practices, it can be used for computers, communications, and administrative systems, but its suitability for critical clinical instruments should not be assumed.

In the business environment, they are especially useful for professional firms, offices, retail stores, supermarkets, pharmacies, hotels, restaurants, financial entities, logistics companies, warehouses, laboratories, educational institutions, and monitoring centers. They are also highly relevant for internet service providers, server rooms, software companies, call centers, industrial plants, mining, energy, and Oil & Gas. In these latter applications, they can sustain communications, networks, PLCs, SCADA, instrumentation, and control systems until a generator starts, power is transferred, or a safe shutdown is executed.

Selection should begin by totaling the real watts of critical loads, not all equipment available in the room. It is recommended to leave at least a 20% margin and avoid operating permanently at maximum capacity. Next, define the required runtime, topology, waveform, number and type of outlets, tower or rack form factor, and communication needs. Compatibility with generators, the possibility of automatic shutdown via PowerChute, the availability of replacement batteries, and the environmental conditions of the site should also be verified.

Proper installation requires ventilation, controlled temperature, grounding, and sufficient space for maintenance. The UPS must not be covered, enclosed without air circulation, or connected using inappropriate extension cords or adapters. It is important to monitor alarms, perform scheduled self-tests, periodically check runtime, and replace the battery when signs of degradation appear. After a prolonged discharge, the recharge time must be respected before demanding full runtime again.

Equipel markets APC solutions for homes, professionals, businesses, offices, IT infrastructure, and industrial applications. Its contribution consists not only in choosing the model with the most VA, but in relating capacity, runtime, criticality, and grid conditions. Proper sizing allows for protecting only the necessary loads, obtaining the expected backup runtime, and avoiding both overloading and an over-dimensioned investment. In the event of an electrical interruption, those minutes of backup runtime can make the difference between a controlled operation and the loss of data, connectivity, or production.