... transformer, EPO & ECO, manual maintenance bypassFeatures:Three phase in and out system, compatible with utility of 380 ... utilitiesGreen power technology, high input power factor, low current THD, high efficiencyIntelligent battery management, extending battery lifetimeIntelligent ... /60Hz±3Hz, adjustableFrequency precision (free running)±0.01%Phase tolerance120°±0.5° (balance and unbalance load)Voltage ...