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Dual Battery Isolator Kit, 12V 140Amp, Manual and Auto Modes VSR Voltage Sensitive Relay with LCD Screen, Smart Battery Isolator

Dual Battery Isolator Kit, 12V 140Amp, Manual and Auto Modes VSR Voltage Sensitive Relay with LCD Screen, Smart Battery Isolator

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$90.73at VEVOR VIPChecked Nov 10

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Price facts

  • Last seen at $90.73 at VEVOR VIP on Nov 10.

Our take on the Dual Battery Isolator Kit, 12V 140Amp, Manual and Auto Modes VSR Voltage Sensitive Relay with LCD Screen, Smart Battery Isolator

A 140-amp voltage sensitive relay kit for dual-battery setups in vehicles, boats and off-grid rigs. It switches between manual and automatic modes and shows battery status on an LCD screen. High and low voltage protection guards both batteries from overcharge and deep drain. It suits owners who want a simple, self-contained isolator without a full DC-DC charger, though it lacks the charging profiles and solar input that pricier DC-DC units offer.

Best forOverland and 4x4 owners running a second batteryVan and camper electrical buildsBoat owners with a house and start batteryDIY installers who want a relay-based isolator
Pros
  • 140A rating handles heavy loads and larger alternators
  • Manual and automatic modes in one unit
  • LCD screen shows battery voltage in real time
  • High and low voltage protection built in
  • Simple relay design, no complex programming
Cons
  • Relay isolation does not charge a deeply drained auxiliary battery as well as a DC-DC charger
  • No solar input or adjustable charging profiles
  • LCD and mode switching add wiring compared with a plain VSR
  • Voltage-only monitoring, no state-of-charge or current readout

Dual Battery Isolator Kit, 12V 140Amp, Manual and Auto Modes VSR Voltage Sensitive Relay with LCD Screen, Smart Battery Isolator prices at every store

  • VEVOR VIPNew

    In stockReturn policy

    $90.73Checked Nov 10
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About the Dual Battery Isolator Kit, 12V 140Amp, Manual and Auto Modes VSR Voltage Sensitive Relay with LCD Screen, Smart Battery Isolator

This is a 12V, 140A dual battery isolator kit for dual battery systems. It is a voltage sensitive relay (VSR) that works in manual or automatic mode. An LCD screen shows battery status in real time.

The isolator has high and low voltage protection. If the voltage falls below 11V or rises above 17V, it automatically disconnects the circuit to prevent damage from voltage irregularities.

The interior is sealed with silicone to protect against water, dust and harsh conditions. The unit is compact enough to mount under the hood or inside an off-road vehicle. It is intended for off-road vehicles, motorhomes, yachts and boats.

Voltage
12V
Current rating
140A
Modes
Manual and automatic
Display
LCD screen showing battery status
Protection
Disconnects below 11V or above 17V
Dimensions
2.7 x 2.7 x 2.2 in
Sealing
Silicone-sealed interior against water and dust
Use
Off-road vehicles, motorhomes, yachts, boats

Questions and answers

How is this different from a plain voltage sensitive relay?
It adds a manual mode, an LCD voltage readout and high and low voltage protection. A plain VSR only switches automatically at a set threshold.
Will it charge a lithium auxiliary battery?
It works on voltage thresholds, so it suits lead-acid and AGM best. Lithium often wants a DC-DC charger with a lithium profile for full charging.
What does the 140A rating mean for my setup?
The relay can pass up to 140 amps between the batteries. Match your cable and fuse to that rating and keep the run short.
Can I switch it manually?
Yes. Manual mode lets you connect or isolate the auxiliary battery yourself, useful for winching or jump-starting from the house battery.
Does it protect against draining the start battery?
Low voltage protection disconnects the auxiliary side so the start battery keeps enough charge to crank the engine.
What is in the kit?
The kit centers on the isolator relay with its LCD and mode controls. Check the listing for the wiring and mounting parts included.
Where is the Dual Battery Isolator Kit, 12V 140Amp, Manual and Auto Modes VSR Voltage Sensitive Relay with LCD Screen, Smart Battery Isolator cheapest?
At VEVOR VIP, for $90.73, as of our latest check.

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