Riden RD6030 Assembled Set 60V 30A Dc Voltage Step-Down Stabilized Lab Power Supply Module Buck Adjustable Converter Bat

Note about the noise about 1500W PSU 1 There is a high frequency noise when the switching power supply is unloaded Due to the large output power range of the product in order to reduce the power consumption of the switching power supply when no load the PWM control chip will jump some control cycles Assume that the original working frequency is 60KHZ If there are more skipping cycles the working frequency will be reduced to less than 20KHZ This Sometimes a noise audible to human ears is produced The size of this noise is also related to the production process of the transformer1 Since the winding and paint impregnation of each transformer1 s coil are slightly different the noise of each product s operation is slightly different 2 There is a loud sound when the fan is running when the ambient temperature is high the fan may work even if it is unloaded These are normal phenomena It is recommended to turn off the AC switch when the product is not in use If you mind it please do not buy it NOTE 1 This Set is already assembled you can connect AC power directly Now there are 4 choices US EU UK Plug the only difference is the AC cable and input AC voltage request others are same 2 This set does not have the WiFi card for APP connection and does not have battery CR1220 for date time display 3 If you want to order the WiFi card you need to know that you must install the battery first if you instll the WiFi card you cannot remove it and install the batte