pwm constant voltage system grid tied controller

{"cid":"91190745","title":"Grid-Tied Controller with IP20 Indoor IP65 Outdoors Protection 99.9% MPPT Efficiency and PWM Constant Voltage System","imgUrl":"https:\/\/img.chinax.com\/nimg\/e2\/82\/147a70bc880b46e4bb54eb7777e4-200x200-1.jpg","attrs":{"Price":"Negotiable","Brand Name":"Greef","Model Number":"GT-PCTC Series Controller","Minimum Order Quantity":"1Set","Delivery Time":"25 Working Days","Certification":"CE","Packaging Details":"Foam+plywooden Case","Payment Terms":"T\/T,Western Union,MoneyGram,L\/C","Supply Ability":"Supply Ability","Cooling Method":"Natural Convection","Output Frequency":"50Hz\/60Hz","Wind turbine rated voltage":"AC220V-600V","Manual Function":"Manual Brake, Reset, Emergency Switch","Communication interface (optional)":"RS485\/USB\/GPRS\/WIFI\/Ethernet","Product Type":"Over Voltage Protection, Grid Cut Off Protection, Regulated Supply Output, Arrester","Function":"Rectifier,Control,DC Output","Pwm Constant Voltage":"\u2265400dc, \u2265700dc"}}