ECO System KUKJE ELECTRIC. MFG. CO., LTD. Digital UPS Energy-control Eco-system UPS Parallel Technology Hybrid ESS System Fire prevention ESS system Menu Digital UPS Energy-control Eco-system UPS Parallel Technology Hybrid ESS System Fire prevention ESS system Energy saving mode ECO mode system (energy saving mode) AC input power (KEPCO power supply) directly supplies power at normal times, and UPS inverter automatically supplies battery power in case of power failure (emergency).