Yueqing Sandi Electric Co.,Ltd is one of the leading China solar stand alone inverters manufacturers,Website: , welcome to wholesale cheap solar stand alone inverters from our professional factory. Technical Parameters Model SDP-250KW Isolation mode Low Frequency Transformer DC Input Rated voltage (Vdc) 600V Rated current（A） 417A AC Output Rated output power 250KW Output waveform Pure Sine Wave Rated Voltage 380VA±3% Phases 3 phase 4 wire Rated current (A) 379A (phase current) Frequency 50Hz or 60Hz Rated output voltage range (V) 380/400/415/440VAC optional Phases Two/ Three phase optional Power Factor (PF) >0.95 Overload Ability 150%, 5 seconds Efficiency >94% Waveform distortion rate (THD) <3%(Linear load) Dynamic Response (0 to 100% load) 5%,≤50ms Display LCD Running mode Working continuously Electrical insulation properties 2000Vac, 1 Minute AC Bypass Function Optional Solar Charge Controller built in Optional AC to DC battery Charger built in Optional RS485 remote monitoring Optional Wide voltage input 100-850VDC(optional) Off grid inverter can work without battery Protection Function Protection Input reverse polarity, under voltage, overvoltage, output over-current, short circuit, overheating etc. Cooling method Fan-cooled Short-circuit protection No automatic recovery, need to restart the machine Working environment Noise ( 1 meter) ≤50dB Degree of protection IP20(indoor) Working Altitude (m) ≤2000 Working temperature -25~+55℃ relative humidity 0~90%，non-condensing Mechanical dimension Depth* Width * Height 1200x1500x1800mm Weight (Kg) 900Kg Certification European CE(EMC & LVD), SAA