How does a VSR differ from a manual battery switch?

A VSR connects and disconnects the auxiliary battery automatically based on voltage, so you don't have to remember to flip a switch. This unit also has a manual mode if you want direct control.

Will it work with a lithium house battery?

Yes. It supports both lithium and lead-acid batteries, so it can charge a lithium auxiliary bank from a lead-acid starting battery.

Can it handle a winch or large alternator?

The 300A rating is meant for high-current 12V systems such as winches and bigger alternators, though you should match cable gauge to the load.

The screen lets you check voltage quickly without a separate meter, useful when diagnosing charging or drain issues.

The isolator unit itself; mounting hardware and cables are not listed, so plan on sourcing your own wiring.

Muvitrix Dual Battery Isolator VSR, 12V 300A

Best price now

$67.41at WalmartChecked Nov 10

Prices are checked against each store and labelled with when.

Visit Walmart

Muvitrix Dual Battery Isolator VSR, 12V 300A

Best price now

$67.41at WalmartChecked Nov 10

Prices are checked against each store and labelled with when.

Visit Walmart

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Price facts

Last seen at $67.41 at Walmart on Nov 10.

Our take on the Muvitrix Dual Battery Isolator VSR, 12V 300A

The Muvitrix VSR005 is a 12V voltage-sensitive relay rated at 300A that links a main and auxiliary battery so the house battery charges only when the engine is running. It works with both lithium and lead-acid batteries and offers manual and automatic VSR modes plus a small LCD for voltage checks. Its compact PA6 housing fits tight engine bays and marine lockers. Against simpler isolators it adds the screen and mode switch, but it lacks the Bluetooth app and temperature sensing some premium units offer.

Best forDual-battery setups in trucks, RVs and boatsOwners mixing lithium and lead-acid banksDo-it-yourself 12V electrical installs

Pros

300A rating suits winches and large alternators
Supports lithium and lead-acid batteries
Manual and automatic VSR modes
LCD shows voltage at a glance
Compact 3.5 x 3.5 x 3.1 in PA6 housing

Cons

No Bluetooth or app monitoring
No temperature compensation for charging
LCD adds a small parasitic draw
Wiring and setup take some electrical know-how

Muvitrix Dual Battery Isolator VSR, 12V 300A prices at every store

WalmartNew
In stockSold by ToyHavenReturns: Sold by a Walmart Marketplace seller; returns go to the seller under the seller's returns policy.
$67.41Free shippingChecked Nov 10
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About the Muvitrix Dual Battery Isolator VSR, 12V 300A

This dual battery isolator is a voltage sensitive relay (VSR) for DC 12V 300A systems. It manages battery power in cars, trucks, RVs, UTVs, ATVs and boats. It works with lithium and lead-acid batteries.

It has manual and automatic VSR modes. An LCD screen lets you check the unit quickly.

The housing is made of black PA6 material. The unit is compact and weighs 0.9 lb net, which keeps handling simple during installation.

Model: VSR005
Voltage: DC 12V
Current: 300A
Modes: Manual and automatic VSR
Display: LCD screen
Battery types: Lithium and lead-acid
Applications: Car, truck, RV, UTV, ATV, boat
Material: PA6
Color: Black
Dimensions: 3.5 x 3.5 x 3.1 in
Weight: 0.9 lb net

Specifications

color: MulticolorSource
size: 3.5" x 3.5" x 3.1"Source

Questions and answers

How does a VSR differ from a manual battery switch?: A VSR connects and disconnects the auxiliary battery automatically based on voltage, so you don't have to remember to flip a switch. This unit also has a manual mode if you want direct control.
Will it work with a lithium house battery?: Yes. It supports both lithium and lead-acid batteries, so it can charge a lithium auxiliary bank from a lead-acid starting battery.
Can it handle a winch or large alternator?: The 300A rating is meant for high-current 12V systems such as winches and bigger alternators, though you should match cable gauge to the load.
Does it work on 24V systems?: No. It is a 12V DC unit only.
What is the LCD for?: The screen lets you check voltage quickly without a separate meter, useful when diagnosing charging or drain issues.
What's in the box?: The isolator unit itself; mounting hardware and cables are not listed, so plan on sourcing your own wiring.
Where is the Muvitrix Dual Battery Isolator VSR, 12V 300A cheapest?: At Walmart, for $67.41, as of our latest check.