--- EL-3K 3000VA/2100W Front Panel: LCD Display AC Mode: Input voltage range: 145~275Vac Input frequency range: 50±0,5Hz Output voltage range: 200~240Vac Overcurrent Protection: Breaker Inverter Mode: Output voltage range: 220Vac±5% Output frequency: 50±0.5Hz (Auto Sensing) Power factor: 0.8 Output wave form: Pure sine wave Transfer time: Typical 2~6ms, Max.10ms. Overload capability: Automally shut down in 60sec while with 110% load, and shut down in 5sec while with 120% load Overcurrent Protection: System shuts down automatically within 20ms BATTERY: Battery model: Sealed maintenance-free lead-acid batteries DC Voltage: DC 48V QTY & capacity of battery: 4 pc*12V9Ah Charging period: 6~8 hours recover to 90% capacity Double CPU controlled Silence function Pure sine wave output Compatible with generator Automatically transferred to battery mode when input over voltage or under voltage Output overload and short circuit protection Can be connected to external battery for longer power supply Powerful charging current for high-capacity battery RJ11/RJ45, communication line protection function RS232/USB port(optional), intelligent monitoring function Unit dimension (mm): 375*192*330 mm Unit weight ( kg): 24,5 kg