UPS Systems

Learn about offline, line-interactive and online UPS types, how to size them, and get supplier quotes for computers and servers.

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Typical configurations. Pick one to start your request; the exact make and specifications are confirmed with suppliers.

  • Line-interactive UPS for a PC

    For a single desktop, router or point-of-sale counter needing short backup during power cuts.

    Type
    Line-interactive
    Phase
    Single phase
    Battery
    Internal sealed battery
    Capacity
    600–1000 VA
    Backup time
    Typically 10–30 min at small load
    Typical load
    1 PC and accessories

  • Online UPS 1–3 kVA

    For small server rooms, labs, clinics and sensitive equipment that needs clean, uninterrupted power.

    Type
    Online double conversion
    Phase
    Single phase
    Battery
    Internal or external battery pack
    Capacity
    1–3 kVA
    Backup time
    Varies by battery bank
    Typical load
    Servers, network racks, lab equipment

  • Online UPS 5–10 kVA

    For larger offices, floors and diagnostic centres that need centralised backup for many devices.

    Type
    Online double conversion
    Phase
    Single or three phase input
    Battery
    External battery bank
    Capacity
    5–10 kVA
    Backup time
    Varies by battery bank
    Typical load
    Office floors, diagnostic equipment

  • Three-phase online UPS

    For data centres, server rooms and plants that run three-phase equipment and need high-capacity protection.

    Type
    Online double conversion
    Phase
    Three phase in, three phase out
    Battery
    External battery bank
    Capacity
    10 kVA and above
    Backup time
    Varies by battery bank
    Typical load
    Server rooms, data centres, plants

  • Not sure which one?

    Tell us where and how it will be used, and we'll suggest the right option.

Compare options

Line-interactive UPS for a PCOnline UPS 1–3 kVAOnline UPS 5–10 kVAThree-phase online UPS
Type Line-interactiveOnline double conversionOnline double conversionOnline double conversion
Phase Single phaseSingle phaseSingle or three phase inputThree phase in, three phase out
Battery Internal sealed batteryInternal or external battery packExternal battery bankExternal battery bank
Capacity 600–1000 VA1–3 kVA5–10 kVA10 kVA and above
Backup time Typically 10–30 min at small loadVaries by battery bankVaries by battery bankVaries by battery bank
Typical load 1 PC and accessoriesServers, network racks, lab equipmentOffice floors, diagnostic equipmentServer rooms, data centres, plants

Typical values; they vary by make and model.

What your quote should include

  • Exact make, model and specifications offered
  • Unit price and GST
  • Delivery charges and time to your location
  • Installation, if needed
  • Warranty and after-sales service

How it works

  1. Share your requirement: quantity, specifications and delivery location.
  2. Our team finds suppliers and checks availability.
  3. You receive quotes and decide. There's no obligation to buy.

Buying guide

Types

  • Offline (standby) UPS — switches to battery when power fails. Basic protection for single home or small-office computers.
  • Line-interactive UPS — adds voltage correction, so it handles brownouts without using the battery. Common for office computers and networking.
  • Online (double-conversion) UPS — continuously supplies clean power from the inverter, with zero transfer time. Choose it for servers, labs and sensitive equipment.
  • Rack-mount UPS — fits in a server rack.
  • Three-phase UPS — for larger loads such as data rooms, buildings and industrial equipment.

What to check before buying

  • Capacity in VA or kVA, and the power factor, because real watts equal VA multiplied by power factor.
  • Backup time needed at your actual load, which determines battery capacity and whether external battery banks are required.
  • Battery type (sealed maintenance-free or lithium-ion) and replacement cycle.
  • Input voltage range, which matters where supply fluctuates widely.
  • Output waveform: pure sine wave is preferred for electronic equipment.
  • Warranty on the UPS and the batteries separately, on-site service, AMC, GST invoice and OEM authorisation.

Common brands include APC, Luminous, Microtek, Numeric and Delta.

Who buys them

Offices, server rooms, banks, hospitals, labs, schools, CCTV control rooms, factories and shops with billing computers.

Frequently asked questions

What UPS capacity does a desktop need?

A typical office desktop with a monitor draws roughly 150 to 300 watts. Add up all connected devices and choose a UPS rated comfortably above that load.

How long will the battery last?

That depends on the battery capacity and your load. Tell the supplier the load and the backup time you want, so they can specify the battery bank.

Do I need online UPS for CCTV?

A line-interactive UPS is usually enough for a small system. Choose online UPS for large recorders or where power is unstable.

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