This Pure Sine Wave Inverter is a combination of an inverter, battery charger and AC auto-transfer switch. High transfer efficiency is above 90%, , complete isolate surge interference of input & output's voltage and current, Impact resistance, super load capacity, built-in AVR stabilizer, continuous stable pure sine wave output. Battery typesetting choose : SLA / AGM / GEL / Li-ion battery & Customize. Support lifep04，Sealed Gel AGM Flooded Lithium Batteries Adjustable Charging Current: The max charge current can be adjusted from 0-35A. Setting the value to 0A will turn off the charging function. Five working mode : AC priority mode / Battery priority mode / Generator mode / ECO mode / Unattended mode. When AC input is present, the battery will be charged first, and the inverter will transfer the input AC to power the load. When you choose battery priority, the inverter will invert from battery dc to ac output . Battery priority mode & Unattended mode have Low volt restore setting and Low volt protect setting. Protections: Battery low voltage alarm / Battery high voltage alarm / Over temperature protection / Over load protection / Short Circuit protection. 110%-120% of the output was maintained for 30s, then the output turned to bypass, more than 160% maintained the 300ms. This Pure Sine Wave Inverter is a combination of an inverter, battery charger and AC auto-transfer switch. High transfer efficiency is above 93%, , complete isolate surge interference of input & output's voltage and current, Impact resistance, super load capacity, built-in AVR stabilizer, continuous stable pure sine wave output.