In this detailed guide, we'll explain everything from what inverter technology is, how a UPS works, to a direct comparison of UPS vs inverter — including real-world applications and where advanced solutions like those offered by Sun-AP Ecopower can play a role in. In this detailed guide, we'll explain everything from what inverter technology is, how a UPS works, to a direct comparison of UPS vs inverter — including real-world applications and where advanced solutions like those offered by Sun-AP Ecopower can play a role in. Inverters and UPS (Uninterruptible Power Supply) are both electrical devices used to provide backup power during power outages. However, they differ in terms of functionality and purpose. An inverter is primarily designed to convert DC (Direct Current) power from a battery or solar panel into AC. A UPS Power Supply, also known as an Uninterruptible Power Supply, is a crucial device that offers immediate backup power in the event of electrical disruptions or outages. What Is an. UPS is an abbreviation for Uninterruptible Power Supply. It is connected with a battery that acts as the source of power. It draws current from the AC mains to power any electronics and also continuously charge the battery. The basic difference between UPS and an inverter is that when the main supply is cut off switching from the main supply occurs instantly while the inverter takes some time from pain supply to inverter.