If you can tell me the you are trying to use the BST-900W for (e.g., charging batteries, running a motor), I can give you more targeted settings and advice. Alternatively, Share public link
Long-press OK for 10 seconds to enter the menu, then select AUTO-OFF .
The output is likely turned OFF (press OK), or your target voltage is set lower than the source voltage.
What are you trying to power or charge? (e.g., a 48V e-bike battery, high-voltage LEDs) bst900w manual
Check input polarity and ensure the voltage is at least 8V.
Connect to the negative/ground terminal of your power source.
The BST900W supports two primary operational modes, as explained in various product manuals. The method to activate them can be found by holding the button for 10 seconds to enter the startup menu. If you can tell me the you are
Improper wiring can destroy the module or cause electrical arcs. Follow these installation rules: Step 1: Source Power Connection
: Illuminates when the load pulls enough power to trigger the constant current limit. Core Operating Procedures 1. Wiring Installation
The BST900W is a high-power, digitally controlled step-up (boost) DC-DC power supply module. It is widely used by electronics hobbyists, solar energy enthusiasts, and DIY battery builders to step up lower DC voltages to higher levels. What are you trying to power or charge
Confirms settings and toggles the output power ON or OFF. 3. Operating Instructions Setting Output Voltage and Current
: Do not exceed the maximum current threshold of 15A on either the input or output side. For high-load configurations running continuously over 10A, ensure the module is placed in a well-ventilated enclosure so the active cooling fan can control heat generation.
: Illuminates when the module is actively regulating the voltage.
I can provide custom wiring configurations or target parameters for your exact project. Share public link