Offline (standby) UPS systems from 600VA to 10kVA for home computers, CCTV surveillance, retail POS and light commercial loads. APC Back-UPS, Luminous Zelio, Microtek EB series — competitive pricing pan-India.
An offline UPS — also called a standby UPS — is the simplest and most affordable type of UPS. Under normal operation, it passes mains power directly through to connected equipment while simultaneously charging the internal battery. When a power failure is detected, an automatic transfer switch (ATS) activates and switches to battery-fed inverter power within 5–25 milliseconds — fast enough for most modern computers but not suitable for truly critical applications.
The offline topology is ideal for home computers, CCTV/DVR systems, retail point-of-sale systems, small retail outlets, and any application where brief transfer time is acceptable and budget is a constraint. For servers, networking equipment or any load where power quality is critical, we recommend online double-conversion UPS instead.
Offline vs Line-Interactive vs Online UPS
Feature
Offline (Standby)
Line-Interactive
Online (Double-Conv.)
Transfer time
5–25 ms
4–8 ms
0 ms (zero)
Voltage regulation
None
AVR (boost/buck)
Continuous
Output waveform
Modified sine wave
Pure sine wave
Pure sine wave
Efficiency
98–99% on mains
95–98%
90–96%
Best for
Home PC, CCTV, retail POS
Office computers, workstations
Servers, medical, data centre
Price
Lowest
Medium
Highest
Offline UPS Products We Supply
APC Back-UPS Series
The world's best-selling UPS for home and small office. Available at 600VA, 1000VA, 1500VA and 2200VA. USB cable for automated graceful shutdown included.
600VA to 2200VA
USB connectivity, PowerChute software
Surge protection on all outlets
Worldwide #1 selling UPS brand
Luminous Zelio / Cruze
India's most popular home and small office UPS. Wide availability of spares and batteries. Available at all Luminous dealers across India with 2-year warranty.
600VA to 2kVA
Very competitive pricing
Wide spare parts availability
LCD display model available
Microtek EB 900 Series
India's most widely distributed UPS for small offices and retail shops. Heavy-duty transformer design for long service life even in harsh voltage conditions.
600VA to 2kVA
Heavy-duty transformer
Wide input range (90–280V)
Rugged casing for harsh environments
Bulk Supply for Retail Chains
Large-quantity supply of offline UPS units for retail chains, franchises and multi-location offices. Volume pricing, co-ordinated delivery, and installation at each site.
Minimum 10 units for bulk pricing
Any brand — APC, Luminous, Microtek
Site-by-site installation available
AMC for entire fleet optional
Frequently Asked Questions
An offline UPS (also called standby UPS) is the simplest type of UPS. Under normal conditions, it passes mains power directly to connected equipment. When a power failure is detected, it switches to battery power within 5–25 milliseconds. This transfer time is fast enough for most computers but NOT suitable for servers, networking equipment or medical devices that require zero transfer time — those need an online double-conversion UPS.
Both types switch to battery when power fails, but a line-interactive UPS adds an AVR (Automatic Voltage Regulator) that corrects voltage without switching to battery, extending battery life in areas with frequent voltage swings. In most Indian cities with frequent voltage dips (15–20% below nominal), a line-interactive UPS is a better investment despite the slightly higher cost.
Yes. Offline UPS is widely used for CCTV and DVR/NVR systems. The 5–25ms transfer time is within the hold-up time of most DVR/NVR power supplies. For critical surveillance applications requiring uninterrupted recording, consider a line-interactive UPS which provides both backup and voltage regulation. We recommend pairing the UPS with a DVR that has a built-in hard disk — SSDs are less susceptible to brief power interruptions.
We supply offline/standby UPS from APC (Back-UPS series), Luminous (Zelio, Cruze), Microtek (EB 900 series) and other brands. APC Back-UPS is the most popular choice for its reliability and software integration. Luminous and Microtek offer very competitive pricing for budget-conscious buyers. We can advise on the best brand for your specific requirement.
For a typical office with desktop computers, monitors and printers, a line-interactive UPS (not offline) is the recommended minimum. For servers, network switches, storage systems or any equipment that cannot tolerate transfer time, an online double-conversion UPS is required. Pure offline UPS is best suited for home computers, CCTV and retail POS where budget is the primary constraint.
Buy Offline UPS — Best Price in India
APC Back-UPS, Luminous Zelio and Microtek EB series. Single units or bulk supply for retail chains. Quote in 2 hours.