This is a Boost converter. The input voltage must be lower than the output voltage.
Many users never unlock the (parameter) menu. According to the BST900W manual, here is how to customize your unit: bst900w manual
A: Normal. The BST900W continues cooling internal components until temperature falls below 45°C (113°F). This can take 2-5 minutes. This is a Boost converter
Confirms settings and toggles the output power ON or OFF. 3. Operating Instructions Setting Output Voltage and Current bst900w manual
Typical rear/front panel includes: