Eaton’s Energy Saver System (ESS) improves efficiency levels to 99%. It does this by suspending the power modules when power conditioning is not required and by enabling inverters to start switching within just 2 milliseconds, when needed. ESS is the most advanced, proven and reliable energy saving system on the market with many years of usage within a wide install base. When compared to extremely high double conversion efficiency, ESS mode can still reduce the losses by 75% with a typical UPS load.