Press the button twice until the current display value (Amperes) flashes.
While the output is active, pressing the (or the designated navigation arrow) allows you to cycle through different real-time data readouts:
Hold down the SET button for 3 seconds until the display shows "M0" (or another slot number). Use the arrows to select your target slot (M0–M9). Press SET to lock it in, adjust the voltage and current as desired, and hold SET to save. bst900w manual
** Disclaimer: This guide is a general operational overview based on standard BST900W hardware specifications. Features may vary slightly depending on the specific manufacturer variant.
| Feature | Details | Notes | | :--- | :--- | :--- | | | DC-DC Step-Up (Boost) Converter | Increases input voltage to a higher output voltage. | | Input Voltage | 8.5V ~ 60V DC | Do not exceed 60V. Some sources specify a minimum of 9V. | | Output Voltage | 10V ~ 120V DC | Must be at least 2V higher than the input voltage for proper operation. | | Max Output Current | 15A (can be limited) | Maximum, but sustained use near this limit may require additional cooling. | | Max Output Power | 900W | The theoretical maximum at 100% efficiency. Real-world maximum will be lower. | | Max Efficiency | ~85% | Common figure across multiple sources; actual efficiency depends on the input/output configuration. | | Switching Frequency | 150 kHz | Affects output ripple and filtering requirements. | | Control Type | Digital with 4-button interface| Uses an STM8S003F3 microcontroller. | | Display | Options: 4-digit 7-segment LED or 1.77" TFT LCD | The display type and resolution vary by version. | | Protections | Short Circuit (Current Limiting, Constant Current mode), Overheat, Overload | No reverse polarity protection ; improper connection will damage the device. | | Fuse | 20A Fuse (non-resettable) on some versions | Replacement of this fuse can be a simple DIY repair if the device fails to power on. | | Storage Profiles | 10 programmable memory slots| For saving and recalling voltage and current settings. | | Physical Size | Varies by version: 110 x 100 x 40mm / 110 x 105 x 48mm| A compact, open-frame design. | | Weight | ~215g - 243g | Very lightweight, making it easy to integrate into projects. | Press the button twice until the current display
The display turns on, but the output voltage matches the input voltage exactly.
general bench testing, prototyping, and safe calibration. Mode 01: Auto-Output Mode Press SET to lock it in, adjust the
Press the button twice to enter current adjustment mode. Use the ↑up arrow or ↓down arrow buttons to set the maximum allowable current (A). Press SET again to save. 3.4 Saving Settings (Memory Function)
The BST900W operates in two primary functional states: viewing mode and setting mode. How to Set Output Voltage and Current Limit