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Thermal protection triggering or input power source sagging.
If you bought a used BST900W without a manual, message the seller. Often, they forgot to include it and can email photos of the paper manual. Politely ask: “Could you scan the safety and wiring pages for me?” bst900w manual
The module features a four-digit LED display, four control buttons, and clear terminal blocks. Button Functions
Displays cumulative Amp-hours (AH) delivered to the load. Excellent for tracking battery charging capacity. This public link is valid for 7 days
Warning: Do not use a manual for a different voltage (e.g., 24V if your unit is 12V) or different waveform (modified vs pure sine wave) – this can damage sensitive electronics.
While rated for 15A, running the module continuously above 10A requires external cooling assistance. Ensure the built-in fan has clear ventilation space. Can’t copy the link right now
Press the button once. The voltage value on the screen will flash.
Select AUTO-ON in the same menu to make the module output automatically upon power-on. 2. Setting Voltage and Current