OONO 18V/30A Low Voltage Disconnect Module — DC 9–28V LVD with Programmable Cutoff, Auto/On/Off Rocker & RGB LED

OONO's 18V/30A LVD is a programmable low-voltage disconnect module that automatically cuts and restores battery output to prevent deep discharge and extend battery life.

This compact, DC 9–28V LVD module is designed for solar arrays, alarm and UPS setups, mobile power systems, and any installation where you must protect a battery from excessive discharge. It combines a microcontroller-driven control circuit with low-resistance MOSFET switching so devices are safeguarded without wasting energy; RGB LED indication and a three-position rocker give clear status and flexible control.

How does the LVD protect my battery during long outages?

Set the module to AUTO and program a cutoff (disconnect) voltage and a reconnect voltage. If battery voltage falls to or below the disconnect threshold for five continuous seconds, the module opens the load circuit; when voltage rises to the reconnect level for five continuous seconds, it closes again. This prevents deep discharge cycles that shorten battery life.

• Adjustable disconnect/reconnect thresholds for precise protection
• 5-second debounce to avoid accidental switching from brief transients
• Automatic reconnection when sufficient charge returns

What settings and user controls are available?

The LVD uses a rocker switch with three positions: AUTO for programmable operation, ON to force the output closed, and OFF to force the output open. In AUTO mode you program the disconnect and reconnect voltages; ON/OFF modes give immediate and persistent control for emergency situations or testing. Green/red LEDs show whether the output is active or disabled.

• Rocker switch: AUTO, ON, OFF
• Program disconnect and reconnect voltages while in AUTO
• Dual-color LED feedback for instant status checks

Will the LVD handle my system’s current and voltage range?

This module accepts DC input from 9 to 28 volts and is rated for continuous currents up to 30 amps, making it suitable for many 12V and 24V battery systems. The internal MOSFETs offer very low on-resistance (<0.003 ohm), minimizing voltage drop and heat under load. Ensure wiring and fusing match your system’s peak currents.

• Operating range: DC 9–28V
• Rated continuous current: 30A with low conduction loss
• Recommend proper fusing and wire gauge for safe installation

How reliable is the switch mechanism and status feedback?

Switching is driven by a microcontroller reading battery voltage and commanding MOSFET outputs, yielding consistent thresholds and long service life compared with mechanical relays. The module filters brief voltage spikes by requiring the threshold be held for five seconds before switching, reducing nuisance toggles. A green/red LED indicates ON/OFF state so you can confirm behavior at a glance.

• Microcontroller control for stable, repeatable thresholds
• 5-second hold rule reduces false triggers from transients
• Visual LED confirmation of load connection state

Who this is for: Installers and owners of small to medium off-grid systems, alarm and UPS technicians, RV and marine power users, and anyone who needs a lightweight, reliable battery protection device that prevents deep discharge without significant power loss. The OONO 18V/30A LVD is a practical choice when you want programmable cutoff behavior, simple manual override, and low-resistance switching for efficient, long-term battery care.