Standby UPS for Small IT Applications

Explore our range of the best offline UPS systems designed to provide reliable standby power for your home and small office. These offline standby UPS units are perfect for safeguarding your IT network peripherals, IoT devices, CCTV, alarm panels, EPoS terminals, and desktop computers. Our offline UPS systems deliver essential protection, offering basic filtering during normal operation and battery backup through an offline inverter during power outages. Whether you need an offline UPS for home use or a standby UPS system for your office, we’ve got you covered.

What is a Standby or Off-line Uninterruptible Power Supply?

A standby UPS is an uninterruptible power supply which is classed under IEC EN62040-3 as Voltage and Frequency Dependent (VFD). This means that the UPS output when the mains power supply is tracks the incoming voltage and frequency inside a pre-set threshold window, normally ±10% in terms of voltage. Outside this the inverter, which is normally off (re the term ‘off-line’) is switched on to support the load with battery power.

The standby or off-line UPS is designed for short-duration runtimes and the support of IT network devices, small computers and PCs, Industry v4.0 and Internet of Things (IoT) applications. The UPS size is generally up to 1kVA and the runtime is provided by a valve regulated lead acid (VRLA) lead acid or lithium-ion battery set.

When mains power is present, a standby UPS will provide basic power protection using an EMI/Spike filter to prevent high energy surges from damaging connected loads. There is no mains voltage stabilisation or regulation unless then inverter section switches on.

The output waveform on inverter will typically be a square-wave or step-wave and with a transfer time of 2-4milliseconds or greater. The waveform and transfer time are suitable for more electronic devices and switch mode power supplies (SMPS).

Output connections can be via IEC320, BS-style 3-square pin or Schuko sockets.

Remote monitoring is available via an RS232/USB interface port built-into the UPS.

User Replaceable Batteries

Off-line UPS tend to have user-replaceable batteries and replacement UPS battery kits can be supplied. The old batteries can be returned for recycling under the WEEE/RoHS directives.