What Is a UPS System Inverter and What Does It Do?

An inverter is one of the main components of a UPS System – It plays a vital role in turning the DC (direct current) power stored in batteries into the AC (alternating current) power required to power your business equipment.

How Does an Inverter Work in a UPS System?

When the UPS system detects a power outage, the DC source activates the inverter. The inverter changes the DC power from the batteries to AC power that is required to run the connected equipment. The inverter monitors the quality of power output to ensure it is clean power, free of surges, spikes, and noise. In case the quality is not up to standard, the inverter triggers the battery to supply additional power until power is restored to the grid.

Benefits of Inverters in UPS Systems

Inverters in a UPS system offer several benefits, including:

  • Increased reliability – Inverters have a fail-safe mechanism, ensuring the system is always operational, even if one of the inverters fails.
  • Good for equipment – Inverters produce clean, stable power, which reduces equipment breakdowns and prolongs their lifespan.
  • Consistent Power Quality – Inverters improve the quality of power supplied to equipment, reducing the chances of power-related issues.


Regular testing and maintenance of the inverter is essential to ensure it functions correctly when needed.

Neglecting maintenance or using unauthorised parts can lead to your power system failing or needing more serious repairs or replacements.

Here are our top reasons for UPS System maintenance:

  1. Maintain business continuity – interruption of power to your business can result in serious repair costs, permanent data loss, revenue loss, decreased productivity and more. Find out more about the effects of unplanned power outages on businesses here.
  2. Maximise your battery lifespan – regular testing ensures your battery health, and identifies any potential problems that can damage your UPS system before they happen.
  3. Keep up to date with warranty requirements – batteries installed by Shanahan Power come with a 12-month warranty, but often manufacturers require maintenance reports for warranty claims.
  4. Avoid costly damage to your UPS system – most UPS failures are battery related and can cause damage to UPS system componentry. Battery failure can be avoided by specialised installation and testing.

Our Asset Care Management service ensures the reliability of your UPS batteries and is also a predictable expense.

Want to find out more about UPS systems? Our team are specialists in pairing you with the right power solution to suit your power needsContact us to find out more, our view our range of power solutions available here!