Connections: 2 x SchukoLCD displayMicroprocessor-based digital controlBoost and buck AVR for voltage stabilizationAuto sensing frequencyWide input voltage rangePower-on self testCold startAuto restart when mains power is restoredAuto track mains phase to ensure that inverter output voltage has same phase with utility voltage, reducing transfer time and peak surgeIntelligent battery management: battery temperature compensation to extend the battery life; three-stage charging to shorten recharge timeShort circuit, battery overcharge / overdischarge, overload, surge protection