VEVOR Dual Battery Isolator 12V 300A with LCD — Manual/Automatic VSR for Lithium & Lead-Acid, Adjustable Delay

VEVOR's Dual Battery Isolator is a 12V, 300A voltage-sensitive relay with both manual and automatic modes and an LCD that manages charging between lithium and lead-acid batteries.

Designed for vehicles and off-grid power setups, this smart isolator balances heavy charging loads while protecting each battery bank. It combines a high-current 300A switching capability with an easy-to-read dual voltage display, adjustable delay timing, and selectable manual override. The unit fits trucks, RVs, boats, ATVs, and work vehicles that use two battery systems and need reliable charge routing without complex rewiring.

How does the VEVOR isolator protect both batteries during charging?

The isolator monitors voltages and only links battery banks under safe conditions, preventing overcharge or deep discharge. Built-in overvoltage and undervoltage protection keeps each bank within safe limits, while a durable enclosure resists shock and dust for long-term reliability.

• Automatic VSR connects banks when voltage thresholds are met.
• Overvoltage and undervoltage cutoffs prevent damage.
• Sturdy, shockproof housing suited for mobile environments.

When should I use manual mode instead of automatic mode?

Manual mode is ideal when you need to force-charge a depleted starter battery from a charged auxiliary battery or when troubleshooting. One-click switching enables safe reverse charging without jumper cables, letting you start a vehicle quickly while still keeping automatic protection available when you switch back.

• Use manual to jump-start a dead main battery from the auxiliary.
• Switch back to automatic for normal charge management.
• Manual override simplifies emergency starts and diagnostics.

What adjustment options are available for timing and voltage sensing?

The isolator offers configurable delay and adjustable start-stop voltages so the system fits different battery chemistries and charging sources. The delay function (3–60 seconds) prevents rapid cycling that can wear relays and batteries, and the voltage settings accommodate lithium, lead-acid, and other battery types.

• Delay timer adjustable between 3 and 60 seconds to reduce switching frequency.
• Start/stop voltage settings configurable for varied battery chemistries.
• Real-time voltage readout helps fine-tune system behavior on the fly.

How will the LCD help me monitor and diagnose my dual-battery setup?

The bright dual-voltage LCD shows both battery voltages from 4.5V to 20V, making it straightforward to spot charging faults or imbalances. With instant readouts you can verify alternator output, battery state, and whether the VSR is connected — helping quickly identify wiring or charging problems before they escalate.

• Displays individual battery voltages in real time for easy checks.
• Voltage range covers common battery types and charging states.
• Useful for diagnosing alternator or wiring issues on site.

Who this is for: Installers, fleet managers, RV owners, boaters, off-grid hobbyists, and anyone who runs two-battery systems and needs a robust, configurable charger-splitting solution. Choose this isolator if you want a high-current, flexible VSR with clear voltage feedback and the option to manually assist a depleted starter battery without extra tools.