Single Phase Online UPS

Purevolt India manufactures single phase online UPS systems from 1 KVA to 10 KVA and above. True double conversion with zero transfer time. Pure sine wave output with less than 3% THD. Protects computers, medical instruments, networking gear, and CCTV from power cuts, spikes, and voltage fluctuations.

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Single Phase Online UPS - Purevolt India

30+Years Manufacturing

60+Countries Exported

1–10 KVASingle Phase Range

ISO 9001Certified

ZeroTransfer Time

Purevolt India manufactures single phase online UPS systems from 1 KVA to 10 KVA and above. True online double conversion technology ensures zero transfer time during power failure. The load always runs from the inverter output, never from the mains. Pure sine wave output with less than 3% THD. Suitable for computers, medical instruments, CCTV, networking equipment, billing machines, and small offices. ISO 9001 certified.

What It Is

Single Phase Online UPS

Your computer, billing machine, CCTV system, networking equipment, or clinic instrument runs on single phase supply. A power cut of even half a second can crash an unsaved file, corrupt a transaction, reboot a network switch, or interrupt a diagnostic test at the worst possible moment. A single phase online UPS prevents all of that. Your equipment always runs from a clean, inverter-generated sine wave. The mains simply charges the battery in the background.

Purevolt manufactures single phase online UPS systems from 1 KVA to 10 KVA and above using true double conversion technology. Available across India at competitive prices, with service support and spares readily available. Built at our Okhla, Delhi facility by the same team that has been making power conditioning products since 1995.

Why Install

Why a Single Phase Online UPS Is Not Optional for Critical Equipment

Power problems on single phase supply in India are not occasional events. They are daily occurrences. Here is what those events actually do to your equipment.

Power Cuts Corrupt Data and Crash Systems

A power cut of 20 milliseconds is enough to crash a running computer, corrupt an open database, halt a POS transaction mid-way, or reboot a network switch. Offline UPS systems have a transfer delay in this range, so they do not actually prevent this. Only an online UPS with zero transfer time eliminates the risk completely.

Voltage Spikes Destroy Electronics Silently

A spike that lasts a few microseconds leaves no visible evidence but degrades components each time it passes through. SMPS power supplies, hard drives, and sensitive PCBs accumulate this damage over months. Then they fail unexpectedly. The spike never reaches your equipment inside an online UPS because your load is always on the inverter output, not the mains.

Medical Instruments Cannot Tolerate Any Interruption

In a clinic or diagnostic centre, an interruption during an ECG reading, ultrasound scan, or patient monitoring event is not just an inconvenience. It can mean repeating a procedure, losing a reading, or in critical care situations, something far worse. A single phase online UPS keeps the supply to medical instruments completely isolated from whatever the mains is doing.

Downtime in Retail and Services Has a Direct Cost

A billing machine that goes down during a transaction, a CCTV system that reboots during a security incident, or a router that drops during a video call all have a direct, measurable cost. The cost of a single phase online UPS is almost always lower than the cost of a few months of these incidents combined.

How It Works

How a Single Phase Online UPS Works

True double conversion. Your single phase load never touches the mains at any point during normal or backup operation.

Mains Feeds the Rectifier, Not the Load

The incoming single phase mains supply goes into a rectifier that converts it from AC to DC. This DC power charges the battery bank and simultaneously powers the inverter. Your equipment never draws from the mains directly.

Inverter Generates Clean 230V AC Sine Wave

The inverter converts the DC from the battery bank back to a clean 230V AC sine wave with less than 3 percent harmonic distortion. This is the power your equipment runs on at all times, whether the mains is healthy, fluctuating, or completely absent.

Power Failure Changes Nothing for the Load

When the mains fails, the inverter simply continues drawing from the battery bank instead of the rectifier. Your equipment does not see any transition at all. Zero milliseconds of interruption. The backup continues until the mains returns or the battery runs out.

Static Bypass for Maintenance

If the UPS is overloaded or needs servicing, the static transfer switch connects the load directly to mains in milliseconds, keeping the load running. When the issue is resolved, the UPS resumes normal double conversion operation automatically.

Technical Specifications

Single Phase Online UPS Specifications

Specification	Details
Capacity Range	1 KVA to 10 KVA and above
Phase	Single Phase In, Single Phase Out
Technology	True Online Double Conversion
Input Voltage	230V AC (wide input window)
Output Voltage	230V AC ±1%
Output Frequency	50 Hz ±0.01% (crystal controlled)
Transfer Time	Zero (load always on inverter output)
Output Waveform	Pure sine wave, less than 3% THD
Inverter Efficiency	92% and above
Backup Time	Configurable; up to 8 hours with extended battery bank
Battery Charger	Intelligent float-cum-boost charger for long battery life
Communication	RS 232C interface; optional SNMP monitoring
Certifications	ISO 9001:2008 certified; tested by reputed testing agencies

Salient Features

Features of Purevolt Single Phase Online UPS

True online double conversion. Zero transfer time on mains failure.
Pure sine wave output. Less than 3% THD at full load.
IGBT-based inverter with efficiency above 92%
Crystal-controlled output frequency at 50 Hz ±0.01%
Wide input voltage window handles Indian grid fluctuations
Intelligent float-cum-boost battery charger for longer battery life
Backup time configurable up to 8 hours with extended battery bank
Static bypass switch for maintenance without load interruption
Microprocessor-controlled with built-in self-diagnostics
RS 232C interface; optional SNMP for remote monitoring
High crest factor above 4:1. Handles non-linear loads including servers.
ISO 9001 certified manufacturing. Units tested before dispatch.

Industries Served

Where Single Phase Online UPS Is Used

Any single phase application where a power interruption causes data loss, equipment damage, safety risk, or unacceptable downtime.

Computers & Servers

Hospitals & Clinics

Banks & ATMs

Networking Gear

Retail Shops

Diagnostic Centres

CCTV Systems

CNC Controllers

Laboratories

Schools & Colleges

Small Offices

Billing Machines

Home Appliances

Automation Systems

Research Labs

Broadcast Studios

How to Select

How to Choose the Right KVA for Single Phase UPS

List all equipment that needs UPS protectionNot every device needs to be on UPS. Identify the critical ones: computers, servers, medical instruments, networking gear, billing machines, CCTV. Leave non-critical loads like fans and lights on direct mains.

Add up their total wattageCheck the power rating on each device’s nameplate. Sum them up. Convert to KVA by dividing KW by 0.8 (for mixed loads). This is your base load figure.

Add 20 to 25 percent headroomUPS systems should not run at 100 percent rated load. Equipment draws surge current at startup. Add headroom to prevent overloading and to allow for future additions.

Decide how long you need backupStandard battery bank gives 30 to 60 minutes at full load. If your power cuts are longer, or if your application needs hours of backup, specify this when ordering. Extended battery banks are available.

Call us with the detailsShare the total KVA, required backup time, and your city. Our team will confirm the right model and send a quote within 24 hours.

Global Reach

Countries We Export Single Phase Online UPS To

ISO 9001 certified. Manufactured in India. Exported to over 60 countries since 1995.

FAQ

Frequently Asked Questions

What is a single phase online UPS?

A single phase online UPS is an uninterruptible power supply that uses true double conversion technology to keep single phase loads running on clean, battery-backed power at all times. The mains never directly powers the load. The rectifier converts mains AC to DC, which charges the battery and feeds the inverter. The inverter generates a clean 230V AC sine wave output for the load. When mains fails, there is zero transfer time because the load was already on the inverter.

What is the difference between online UPS and offline UPS?

An online UPS (double conversion) always runs the load through the inverter. There is zero transfer time on mains failure. An offline UPS runs the load directly on mains and switches to battery only when power fails, with a transfer delay of 10 to 20 milliseconds. For computers, medical equipment, servers, and networking gear, only an online UPS provides adequate protection.

What capacity does Purevolt offer in single phase online UPS?

Purevolt manufactures single phase online UPS from 1 KVA to 10 KVA and above. The right capacity depends on your total connected load. Add up the wattage of all equipment you want to protect, add 20 to 25 percent headroom, and that gives you the required KVA. Our team can help with sizing at no charge.

How long does the battery backup last?

Standard battery bank provides 30 to 60 minutes of backup at full load. Extended battery banks are available for longer backup requirements, up to 8 hours in some configurations. The required backup time should be specified when ordering so the correct battery bank size is supplied.

Is the Purevolt single phase UPS suitable for medical equipment?

Yes. Purevolt single phase online UPS is suitable for medical diagnostic equipment, patient monitoring systems, imaging instruments, and clinic infrastructure. The pure sine wave output with less than 3 percent THD meets the power quality requirements of sensitive medical instruments. The zero transfer time ensures no interruption during a power event.

What happens when the UPS is overloaded?

When the load exceeds the rated capacity of the UPS, the static bypass switch activates and transfers the load to mains supply in milliseconds. The load continues to run on mains while the overload condition exists. An alarm is triggered to alert the user. Once the overload is removed, the UPS resumes double conversion operation automatically.