VEVOR Dual Battery Isolator 12V 300A 20ft 2AWG — Manual/Automatic VSR with LCD Voltmeter

VEVOR's Dual Battery Isolator Kit is a 12V 300A smart voltage-sensitive relay system that safely manages charging between two batteries, offering manual/automatic modes and a dual voltmeter display for RVs, trucks, boats, and off-grid vehicles.

This compact kit combines a high-current VSR, an LCD voltmeter, and heavy 2AWG cabling to create a reliable split-charge solution for dual-battery setups. It supports multiple battery chemistries including lithium and lead-acid, protects against over/under-voltage conditions, and reduces wear with an adjustable delay to prevent rapid switching. The package includes connectors, heat-shrink tubing, mounting hardware, and zip ties to simplify installation in a wide range of vehicles and mobile power systems.

How does the VEVOR isolator protect and extend battery life?

The isolator prevents one battery from draining the other by physically separating the charge paths until voltage thresholds are reached. Built-in overvoltage and undervoltage protection minimize damaging conditions, while the adjustable 3–60 second delay avoids rapid on/off cycles that stress relays and batteries.

• 300A continuous current rating for high-capacity systems
• Adjustable delay (3–60 seconds) to reduce wear
• Overvoltage and undervoltage safeguards for safer charging
• Shockproof, dustproof construction for harsh environments

Can I use this isolator with lithium batteries and modern vehicles?

Yes — the VEVOR kit is designed to work with lithium, lead-acid, and other common battery types. Voltage thresholds are adjustable to match chemistry-specific charging windows, and the manual override lets you join batteries when necessary for emergency starts or balancing.

• Compatibility with lithium and lead-acid chemistries
• Manual mode for reverse-charging or emergency starts
• 12V operating range with voltmeter from 4.5V to 20V for diagnostics
• Ideal for vehicles with start-stop systems when configured correctly

What installation and monitoring features does the kit include?

The kit ships with 20 ft of 2AWG red cable, a 2 ft 2AWG black ground cable, mounting screws, copper connectors, and heat-shrink tubing to support neat, secure wiring. The bright dual-voltage LCD lets you watch both battery voltages in real time, making fault-finding and system checks fast and intuitive.

• 20 ft (6 m) heavy-duty 2AWG positive cable and 2 ft ground cable
• High-brightness dual voltmeter LCD for real-time readings
• Included cable lugs, connectors, heat-shrink, and zip ties for tidy installs
• Mounting screws and compact form factor for tight spaces

How does the manual vs automatic mode improve usability?

Automatic mode uses voltage-sensitive switching to combine batteries only when charging conditions are met, keeping auxiliaries isolated while parked and running electronics. Manual mode gives you control to link batteries for engine starts or to intentionally balance charge between batteries without jumper cables.

• Automatic VSR connects batteries based on voltage thresholds
• One-click manual override for immediate battery linking
• Reduces need for external jump-start equipment
• Useful in recovery, remote starts, and battery maintenance situations

Who is this for? Vehicle owners, vanlifers, RVers, marine users, and off-grid system builders who run dual-battery setups and need a rugged, high-current isolator with monitoring and flexible control will benefit most. If you require a durable split-charge solution that supports modern battery chemistries, simplifies wiring, and gives visible voltage feedback, the VEVOR Dual Battery Isolator Kit is built to meet those needs.