YABUYALI SMP3 Power Supply Charger 6/12/24V 2.5A

The YABUYALI SMP3 is a compact multi-voltage power supply and charger that converts 16–28VAC to selectable 6V, 12V or 24V DC at 2.5A with sealed lead-acid/gel battery backup and automatic switchover.

Designed for small security, alarm and access-control systems, the SMP3 provides a reliable regulated DC source with an integrated charger and LED diagnostics in a pocket-sized enclosure. It’s factory-set to 12VDC but can be switched to 6VDC or 24VDC to match a range of devices. The unit accepts common low-voltage transformer inputs and includes protections and monitoring features that simplify installation and operation.

How does the SMP3 keep critical devices running during power loss?

The SMP3 charges a sealed lead-acid or gel cell and automatically transfers to battery output if AC power fails, keeping connected devices powered without manual intervention. The charger supplies a gentle, regulated charge to preserve battery life and prevents overcharge.

• Auto-transfer to battery on AC fail for uninterrupted operation.
• Sealed lead-acid/gel compatible charging with max ~350–550mA charge current depending on configuration.
• Overcharge protection and regulation to extend battery lifetime.
• LED status shows AC present or battery-mode for quick diagnostics.

What input and output options does it support?

The module accepts low-voltage AC from 16VAC up to 28VAC and provides switch-selectable DC output of 6V, 12V or 24V at up to 2.5A continuous. It works with typical security transformer sizes; choose a transformer rated to meet the current demand plus battery charging needs.

• Input: 16VAC–28VAC (requires appropriate transformer, e.g., 16VAC/40VA or 28VAC/100VA).
• Output: Selectable 6VDC, 12VDC (factory) or 24VDC at 2.5A continuous.
• Battery connections accept common sealed lead-acid or gel cells; use recommended wire gauge (18AWG).
• Filtered and electronically regulated output reduces voltage fluctuation and noise.

How will I know if the SMP3 has a fault or is in backup mode?

LED indicators on the front panel provide an at-a-glance status: green indicates normal AC operation, while red signals DC or battery backup mode. Built-in diagnostic logic can also indicate overloads, short circuits and battery undervoltage states so you can respond quickly.

• Green LED = AC present and normal operation.
• Red LED = DC/battery backup mode active.
• Combined LED states convey short circuit, overload, or battery issues.
• Clear terminal labels simplify identifying AC, DC and battery connections.

Who is this for? Installers and technicians specifying compact power solutions for small security panels, CO/smoke detectors, access controls, and other low-voltage devices will value the SMP3 for its flexible outputs, built-in battery charger and small footprint. It’s a practical choice when space is limited but reliable regulated DC and battery redundancy are required. Professional installation is recommended to meet local electrical codes and ensure correct transformer sizing and wiring. YABUYALI provides pre-tested units and support materials to help with integration into existing systems.