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VEVOR 12V 140A Split Charge Relay Kit vs Blue Sea Systems Automatic Charging Relay

The VEVOR kit is the practical pick for most 12V dual-battery setups: it ships as a complete kit with a 6 m wiring harness, 140A continuous rating and IP65 sealing, and it installs with a simple 3-wire connection. The Blue Sea Systems ACR is the better-built unit, with hermetically sealed contacts, IP67 protection and ignition protection, but it is a 24V relay rated 210A intermittent for 5 minutes. Buy the Blue Sea if you run a 24V system or want a marine-grade component; buy the VEVOR if you need a full 12V kit in one box.

  • Choose the VEVOR if you have a 12V dual-battery system and want a complete kit with harness, hardware and a waterproof housing in one purchase.
  • Choose the Blue Sea Systems ACR if you run a 24V DC system and want sealed, ignition-protected contacts built to marine standards.

Prices

  • VEVOR 12V 140A Split Charge Relay Kit: $55.94 at Amazon (last seen Nov 9)
  • Blue Sea Systems Automatic Charging Relay: $84.81 at Amazon (checked today)
  • Difference: the VEVOR 12V 140A Split Charge Relay Kit is $28.87 cheaper than the Blue Sea Systems Automatic Charging Relay at the latest prices (Nov 9 and Nov 10)
VEVOR
VEVOR Split Charge Relay Kit, 6mtr 12V, 140AMP VSR

VEVOR 12V 140A Split Charge Relay Kit

VEVOR Split Charge Relay Kit, 6mtr 12V, 140AMP VSR

5(2 ratings)
$55.94at AmazonChecked 16 h ago
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Pros
  • Complete kit with 6 m harness and mounting hardware
  • 140A continuous rating suits most 12V dual-battery loads
  • IP65 housing resists dust, rain and vibration
  • Simple 3-wire install with no alternator connection
  • Works across ATVs, boats, trucks and motorhomes
Cons
  • 12V only
  • No stated ignition protection for gasoline engine bays
  • No combine time delay, so it can switch on brief voltage spikes
  • Plastic housing is less sealed than a hermetically sealed relay
Blue Sea Systems
Blue Sea Systems Automatic Charging Relay

Blue Sea Systems Automatic Charging Relay

$84.81at AmazonChecked 57 min ago
See all prices and details
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Pros
  • Hermetically sealed, vaporproof contacts
  • IP67 rated for temporary immersion
  • Ignition protected for gasoline-powered boats
  • 90-second delay prevents chatter from short voltage spikes
  • Surge protection for sensitive electronics
Cons
  • 24V only, not a drop-in for 12V systems
  • Relay only, no harness or hardware included
  • 210A rating is intermittent, 5 minutes
  • Stud terminals need ring lugs and a torque wrench

What separates them

VEVOR 12V 140A Split Charge Relay KitBlue Sea Systems Automatic Charging Relay
System voltage12V, cut-in at 13.3V24V DC coil and contacts
Current rating140A continuous, 160A intermittent210A intermittent for 5 minutes
What's in the boxRelay, 6 m harness, screws and cable tiesRelay only
Water and dust protectionIP65, dustproof and rain-resistantIP67, survives temporary immersion
Contact sealingPlastic and nylon housing with silicone-sealed inner layerHermetically sealed, vaporproof contacts
Ignition protectionNot statedIgnition protected for gasoline engine compartments
Wiring3-wire connection at the battery, no alternator or ignition tapTwo stud terminals, quick connect
Combine delayVoltage-triggered cut-in, no stated delay90-second delay before combining

Price history

$84.81$50.07
Nov 3Nov 10
  • VEVOR 12V 140A Split Charge Relay Kit: lowest $50.07 on Nov 9 at VEVOR.
  • Blue Sea Systems Automatic Charging Relay: lowest $84.81 on Nov 10 at Amazon.

Prices at every store

VEVOR 12V 140A Split Charge Relay Kit

  • VEVORNew

    In stock

    $58.90Free shippingChecked 16 h ago
    Visit VEVOR
  • The Home DepotNew

    In stock

    $58.90Free shippingChecked 16 h ago
    Visit The Home Depot
  • AmazonNew

    Availability unknown

    As an Amazon Associate, Deal.ai earns from qualifying purchases.

    $55.94Free shippingChecked 16 h ago
    Visit Amazon
  • FactoryPureNew

    Availability unknown

    $58.90Checked Nov 5
    Visit FactoryPure

Also available at

  • WalmartCheck price at Walmart
All 6 stores and price history →

Blue Sea Systems Automatic Charging Relay

  • The Home DepotNew

    In stock

    $93.84Free shippingChecked 56 min ago
    Visit The Home Depot
  • Hodges MarineNew

    In stock

    $108.05Free shippingChecked 56 min ago
    Visit Hodges Marine
  • Wake WorksNew

    In stock

    $109.97Free shippingChecked 56 min ago
    Visit Wake Works
  • AmazonNew

    Availability unknown

    As an Amazon Associate, Deal.ai earns from qualifying purchases.

    $84.81Free shippingChecked 57 min ago
    Visit Amazon
All 17 stores and price history →

Specs compared

SpecVEVOR 12V 140A Split Charge Relay KitBlue Sea Systems Automatic Charging Relay
Weather ResistanceYesVaporproof
Voltage13.3V (Cut-in)24V DC
Amperage140A (Continuous Current), 160A (Intermittent C…210 A (intermittent rating, 5 min)
Connection Type3-wire connectionQuick Connect
Bulbs IncludedNO—
Housing MaterialPlastic, Nylon Plastic—
Highlighted FeatureSmart Charging, Dual Battery Isolator—
Suitable Vehicle TypeATV, Boat, Car, Jeep, Motorcycle, SUV, Truck—
Use CaseMarine, Off-Road, Towing—
TerrainMarine, Off-road—
Typical UsersDIY Installers, DIY mechanics—
Water ResistanceIP65, Waterproof—
Show all 40 specsShow fewer specs
SpecVEVOR 12V 140A Split Charge Relay KitBlue Sea Systems Automatic Charging Relay
Dust ResistanceDustproof, IP65—
Impact ResistanceShockproof, High impact strength—
Shock ResistanceYes—
Vibration ResistanceYes, Anti-vibration capabilities—
Electrical ControllerNO—
Power SourceVehicle Battery—
Wiring Harness IncludedYes—
Current Draw280mA (Charging), 8mA (Standby)—
Ballast IncludedNO—

What reviewers say

VEVOR 12V 140A Split Charge Relay Kit

Owners value this kit for its straightforward installation and comprehensive accessory package. It is frequently praised for its durability in off-road environments, though some users note the lack of advanced monitoring features found on premium rivals.

What people mention
  • InstallationPraisedUsers find the 3-wire connection simple to set up without needing to tap into the ignition.
  • Build qualityMixedThe internal silicone sealing is praised for vibration resistance, but the plastic outer shell is seen as less premium than metal alternatives.
  • WeatherproofingPraisedThe IP65 rating is noted as effective against dust and rain in engine bays and marine environments.

Blue Sea Systems Automatic Charging Relay

Owners of this ACR generally report reliable automatic combining and isolation of battery banks, with the sealed, ignition-protected housing trusted in engine compartments. Complaints center on the lack of a manual override and the need to confirm the 24V coil matches the system.

What people mention
  • ReliabilityPraisedOwners say it combines and separates battery banks consistently without fuss.
  • SealingPraisedThe vaporproof, IP67 housing is trusted in damp engine compartments.
  • Manual overrideCriticisedSome wish they could force the banks together, which this model cannot do.
  • VoltageMixedBuyers note the 24V coil must match the system; 12V setups need a different unit.

Questions and answers

Which is better for a 12V camper or boat dual-battery setup?
The VEVOR. It is a 12V unit with a 6 m harness and hardware included. The Blue Sea ACR is a 24V relay, so it will not work on a 12V system without a different model.
Which one lasts longer?
The Blue Sea has the more durable design: hermetically sealed contacts, IP67 sealing and ignition protection. The VEVOR's silicone-sealed plastic housing is fine for splash and dust but is not built for immersion or engine-compartment vapor.
Is the Blue Sea worth stepping up to?
Only if you run 24V or need sealed, ignition-protected contacts in a gasoline engine space. For a 12V install, the VEVOR's complete kit and 140A continuous rating cover most loads.
Can the VEVOR handle a winch or large inverter?
Its 140A continuous and 160A intermittent ratings cover moderate loads. Check your alternator and cable size; a winch pulling high current for long periods can exceed the intermittent rating.
Does the Blue Sea delay combining the batteries?
Yes. It waits 90 seconds before combining, which avoids chatter from short voltage spikes. The VEVOR switches on voltage alone with no stated delay.
Are both safe near gasoline engines?
The Blue Sea is ignition protected and rated for gasoline-powered boats. The VEVOR lists no ignition protection, so mount it away from fuel vapor and spark sources.

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Buying guides that pick them

  • Best dual battery isolators
Height
2.66 in / 6.76 cm
—
Length2.66 in / 6.76 cm—
Width2.11 in / 5.36 cm—
colorBlack—
size2.66 x 2.11 x 2.66 in / 6.76 x 5.36 x 6.76 cm—
Type of VehicleCar—
Switch Type—Automatic Charging Relay (ACR)
Current Type—DC
Coil Voltage—24 Volts
Contact Form—Normally Open
Power Consumption—2880.0 W
Certifications—Ignition protected
Safety Features—Ignition protected
Standards—Automotive and Marine Electrical System Standar…
Degree Of Protection—IP67 (temporary immersion for 30 minutes)
Surge Protection—Protects sensitive electronics from sags and sp…
Terminal Type—Stud
Housing Type—Hermetically sealed contacts/vaporproof
Mounting Type—Panel Mount