The 12 Best 12 Volt Battery Isolator Relays (2022 reviews)

The Stinger 12 volt battery isolator relay is the epitome of what a great relay should be. The Stinger 12 Volt Battery Isolator Relay works perfectly and has a great design. Ideal for battery isolation, stinger's high current relays are the most reliable and efficient way to add secondary batteries to your system. Moreover, the relay is great for high quality and it is black.

The relay is good for good quality, It is designed for a great price and has a simple design. Above all, the stinger 12 volt battery isolator relay is compatible with all types of alternators and charging systems, Simply connecting these relays to operate when the ignition is turned on.

Almost all buyers opine that the relay is easy to install, use and add a circuit fuse adapter so it is wired to the window switch and operates the relay. Further, they say that the relay works well in its intended application. Moreover, a few say that if the relay is used to run lights or the big stereo,s the risk would be killing the house battery system. To sum up, most buyers agree that the relay suits best, and no one questions it.

Top Customer Quotes:

This is supposed to be constant duty, it quit working in 10 minutes.
This works well, but has some flaws.
This has worked without issue from the start.
The device in question relay ) is capable of doing exactly that.

RELATED: Best 12 Volt Battery Clips

Best For Van: Cllena 12 Volt Battery Isolator Relay

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The Cllena 12 Volt Battery Isolator Relay might be a relatively new release, but it's still nothing short of impressive this year, thanks to multiple price cuts and added new features over the past few months. The cllena 12 volt battery isolator relay is used for water proof, installed the terminal connectors, It is perfect for high quality and has a flexible design. Make sure this fits by entering your model number. The 250 amp dual battery isolator is to ensure the primary battery is always charged and ready to start the vehicle.

The relay makes for solid construction, is good for high capacity, It is made for very solid construction and has an original design. Above all, the cllena 12 volt battery isolator relay is ideal for heavy duty terminals, is very solid, it is black and has a solid design.

Almost all customers quickly discovered that the relay is not brand specific but they are all similar. Furthermore, a few also found that the relay comes with mounting hardware. Moreover, a few say that the relay is that the switch is kind of hard to turn. In short, buyers found this to be one of the best relay for daily purposes.

Top Customer Quotes:

This is a pain to have to disconnect the battery after camping to prevent battery drain.
This is rated at 48 volts.
This is a make and break switch. It only has 2 connections.
This is intended to mount inline of ground wire.

Best For Rv: Jaycorp 12 Volt Battery Isolator Relay

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Next on the list, we've got yet another relay that manages to win our hearts. It's the Jaycorp 12 Volt Battery Isolator Relay and it's widely considered as the relay that has the most suitable features. The jaycorp 12 volt battery isolator relay has mounting screws, It works great and has a nice design. This prevents problems that may result from your charging source being too low in amps to charge all batteries at once. These units can be installed between batteries with a common ground to automatically control the charging process to the batteries but continue to provide isolation when a charging source is unavailable.

Most importantly, the jaycorp 12 volt battery isolator relay is receiving a charge, e.g.

Almost all customers agree that the relay is a smart device which senses both batteries and if either one is receiving a charge, it will enable charging of both. Moreover, they also found that the relay is used to add a 2nd battery to support dashcam parking-mode operation.

Top Customer Quotes:

It works very well, works very well it works fine and has an original design.
This reduces the amount of current available to charge the batteries.
This is easy to connect, it is good for travel trailers and has a great design.
Compact 2.68" (68mm) by 2.68" (68mm) by 1.93" (49mm) size.

Best For Show Systems: Pac 12 Volt Battery Isolator Relay

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The Pac 12 Volt Battery Isolator Relay is the most suitable relay on the market today. The pac 12 volt battery isolator relay is great for isolating a second batter making it dedicated to the stereo system. . This relay between batteries as an isolator or in the main power lead servicing the mobile audio system, light bars or any other equipment requiring on / off control.

Above all, the pac 12 volt battery isolator relay works as described, is remote and it is inexpensive.

Most buyers agree that the relay is used to disconnect trailer interior parasitic losses. Moreover, they strongly agree that the relay is used for a 95 mark 8 fan and there has been no problems. In conclusion, buyers found this to be one of the best relay for daily purposes.

Top Customer Quotes:

does not create a voltage drop to the second battery like conventional isolators.
This comes with a great item, works great and it is used for heavy-duty.
Mobile audio relay and battery isolator.
This is perfect for show systems utilizing lighting and motorized enhancements.

Best For Input Voltage: Uckasayfy 12 Volt Battery Isolator Relay

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Not everyone likes to purchase a relay for their regular usage, but the Uckasayfy 12 Volt Battery Isolator Relay would be an anomoly. The uckasayfy 12 voltbattery isolator relay allows for easy installing and it works for important things. Together with you to provide better services. Also, this comes with the engine running. The vsr will engage when the starting battery reaches 13.3 volts and the led light will illuminate.

The relay is suitable for almost anywhere, for atv, utv, boats, rv's，marine vehicle,sss truck, caravan.s. Lastly, the uckasayfy 12 volt battery isolator relay is good for input voltage and it works great.

Most buyers quickly discovered that the relay does a great job isolating the batteries. Also, they strongly agree that the relay is an easy to use battery isolator. Further, they say that the voltmeter and built in switch to open the circuit to starter battery. To sum up, the tone of buyers is very positive and we believe that the relay suits the purpose.

Customers say that getting a 12 volt solar panel isolator switch and 12 volt voltage display, along with relay is useful.

Top Customer Quotes:

It is easy to install and the instructions are very clear.
The Manufacturer says: we have exquisite craft, strict quality control along with excellent after-sales service.
【Important note】——when connecting accessories to your second battery, ensure they are fused within 0.98ft.
This is constructed with good instructions, is practical and it is designed for a great price.

Best For Good Value: Dewinner 12 Volt Battery Isolator Relay

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Dewinner has been making great relays for years, thanks to a combination of clever design and appropriate materials. The Dewinner 12 Volt Battery Isolator Relay includes all parts required for a complete installation. The inner layer of silicone seal can protect your isolator from any water damage. The dewinner dual battery isolator kit can be installed almost anywhere.

The relay works great, works flawlessly and it is made for good value. Lastly, the dewinner 12volt battery isolatorrelay is made for easy install, It is black and has a great design.

Most customers agree that the relay is easy to install, instructions were clear. Further, a few strongly agree that the relay is not bothersome, actually somewhat relieving to hear. Moreover, a few also found that the relay will insure that the starting battery is charged and ready to start the outboard motor after a long day on the water running electronics and other accessories. Consequently, customers were very happy to recommend it to friends and families.

Customers discovered that getting a 12 volt solar panel isolator switch, along with relay is useful.

Why We Like This:

Every 140 amp dual batteryisolator is backed by an industry - leading 12.
This has a 12 v 140 amp voltage sensitive relay isolator.
The dewinner battery isolator always has enough power to charge all your batteries safely.
This is suitable for lead-acid batteries versus lead-acid batteries.

Best For Easy Connection: Newishtool 12 Volt Battery Isolator Relay

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Best part: new 12 volt battery isolator relay costs comparatively low and it is available to ship in 24 hours. The new 12 volt battery isolator relay is remote and it is perfect for dual battery isolation. don't need to drain the original battery on your vehicles trying out your new devices when off-roading, The dual battery isolator will be a nice solution to lengthen the life of the primary battery when your vehicle 's engine is off. Also, the relay is easy to install, just power wire in, power wire out.

The relay is designed in small size, portable and compatible for a wide variety of vehicles such as 12v/24v jeep, truck, suv, rv, caravan & camping applications. In addition, it works for input voltage and it works perfectly. Most importantly, the new 12 volt battery isolator relay is for universal applications and it is perfect for easy connection.

Almost all customers quickly discovered that the relay will send power from your alternator to both the batteries. And, they also found that the relays are going to add a booklet with them now. In conclusion, most buyers found the relay is functionally comfortable and no one questions it.

Top Customer Quotes:

This has functioned flawlessly at a fraction of the price of other available units.
This is easy to install and so far works as advertised.
This will charge the main first.

Best For Truck Battery: Ampper 12 Volt Battery Isolator Relay

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The Ampper 12 Volt Battery Isolator Relay's material feels more premium than its price would suggest. The ampper 12 voltbattery isolator relay has a current rating and it works great. 4, ensure your primary battery is always charged and ready to start your engine, the secondary will be charged after the primary battery's volts exceed 13.3 volts. This voltage sensitive relay is heavily built to be suitable for almost anywhere, even off - road, which is water resistant, shock resistant, dust proof and withstands unexpected extreme weather environments.

Lastly, the ampper 12volt battery isolatorrelay is great for a great price, It is perfect for great quality and has a great design.

"Easy to install to monitor your solar charging. " - says, one customer. Overall, buyers found this to be one of the best relay for daily purposes.

Customers discovered that getting a isolator switches for 12 volt, with this relay made their life much easier.

Why We Like This:

This comes with a mounting plate and 4 bolts for installing.
New and hot releases.

Best For Wide Applications: Wonvon 12 Volt Battery Isolator Relay

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The Wonvon 12 Volt Battery Isolator Relay is satisfactory and appropriate and fits well with your daily purpose. The wonvon 12 volt batteryisolator relay is great for five wheels and it is black. A perfect fit under the hood to get close to your dual batteries.3.voltage sensitive relay (vsr) cuts in at 13.3 volts and cuts out at 12.8 volts to ensure your primary battery is always charged and ready to start your vehicle. The yellow wire needs to be connected to a switch, and then the switch connects to the earth.

The relay is the only unit designed with cutting edge programming to deliver optimum performance.2.this compact battery isolator was built ultra-small to fit almost anywhere. Moreover, this works well, the yellow wire does not need to work. Above all, the wonvon 12 volt battery isolator relay has a current rating and it is suitable for wide applications.

Why We Like This:

This is great for extreme vibration applications as well.
The Dual battery isolator is a unit with advanced programming to provide the best performance.
New and hot releases.

Best For Power Saving: Mayspare 12 Volt Battery Isolator Relay

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We would, of course, be remiss if we didn't mention Mayspare 12 Volt Battery Isolator Relay for daily purpose. The mayspare 12 volt battery isolator relay is made for universal applications and it works great. The battery isolator, also known as a split charge relay, uses your vehicle's power to charge an auxiliary battery and blocks your starting battery from getting drained by your equipment when the engine is turned off. And, this is very easy and it is good for power saving.

The relay is normal for the voltmeters to have an error between 0.3v. Most importantly, the mayspare 12 volt battery isolator relay flashes after disconnection, plus it is easy to install, just power wire in, power wire out.

Most customers think that the relay is a great buy for the price. In addition, a few strongly agree that the relay is easy to install and it's worth every cent. In conclusion, the tone of buyers is very positive and we believe that the relay suits the purpose.

Why We Like This:

No need to discharge your vehicle's original battery by trying your new equipment off-road.
High current 250 amp continue current.
This is made of high-grand copper to improve the electrical conductivity.

Best For Premium Quality: Gerguirry 12 Volt Battery Isolator Relay

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The look and feel of these relays are consistent with the high quality we're used to from the rest of Gerguirry's lineup. The Gerguirry 12 Volt Battery Isolator Relay has a solid glass fiber reinforced nylon shell, strong and durable, with excellent waterproof and dust-proof performance. Once your main starter battery is sufficiently charged, it will begin charging the second battery too. And, it is good for packing list and it has a storage mode.

Lastly, the gerguirry 12 volt battery isolator relay has charging operation and it allows zero power consumption.

Few customers bought 12 volt solar panel isolator switch, along with the relay.

Why We Like This:

When the battery on your left is not charging, it is used up.
This is remote and it is suitable for wide applications.
It allows two batteries to be charged from your alternator.
This can be trusted for premium quality and it is intelligent.

Best For Truck: Spartan Power 12 Volt Battery Isolator Relay

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The Spartan Power 12 Volt Battery Isolator Relay's superior materials make sure that it ages well with use. An automatic 140 amp dual battery isolator enables you to charge two battery systems from one alternator at the same time. Moreover, the relay offers complete protection from dust, oil, and other non-corrosive material.s. The relay is easy to maintain and fits perfectly for your regular use.

Customers found that buying a 12 volt battery voltage display, along with relay is useful.

Why We Like This:

The Manufacturer says: We are an American company located in Reno, Nevada.
One of the newcomers and featured product.