Contact Type | Normally Open |
---|---|
Current Rating | 140 Amps |
Brand | JayCorp |
Operation Mode | Automatic |
Coil Voltage | 12 Volts |
Contact Current Rating | 140 Amps |
Manufacturer | True Amalgamated |
Item Weight | 11 ounces |
Product Dimensions | 2.68 x 2.68 x 1.93 inches |
Item model number | VSR12 |
Is Discontinued By Manufacturer | No |
Manufacturer Part Number | VSR12 |
Voltage | 12 Volts |
12V Dual Battery 140A Smart Isolator (VSR Voltage Sensitive Relay) for Auto/Boat/RV
Return this item for free
Free returns are available for the shipping address you chose. You can return the item for any reason in new and unused condition: no shipping charges
Learn more about free returns.- Go to your orders and start the return
- Select the return method
- Ship it!
Return this item for free
Free returns are available for the shipping address you chose. You can return the item for any reason in new and unused condition: no shipping charges
Learn more about free returns.- Go to your orders and start the return
- Select the return method
- Ship it!
Purchase options and add-ons
Contact Type | Normally Open |
Current Rating | 140 Amps |
Brand | JayCorp |
Operation Mode | Automatic |
Coil Voltage | 12 Volts |
About this item
- 12V 140A smart isolator with Cut-In:13.4V, Cut-Out:12.9V
- Easy connection at the battery. No need to bypass existing alternator wiring.
- The smart isolator has no voltage drop. Conventional diode isolators incur a minimum of 0.6 volt drop
- Compact 2.68" (68mm) by 2.68" (68mm) by 1.93" (49mm) size
- Easy to install anywhere - Water and dust resistant - Mounting screws and detailed instructions included.
Frequently bought together
Compare with similar items
This Item 12V Dual Battery 140A Smart Isolator (VSR Voltage Sensitive Relay) for Auto/Boat/RV | Recommendations | dummy | dummy | dummy | dummy | |
Try again! Added to Cart Add to Cart | Try again! Added to Cart Add to Cart | Try again! Added to Cart Add to Cart | Try again! Added to Cart Add to Cart | Try again! Added to Cart Add to Cart | Try again! Added to Cart Add to Cart | |
Price | $85.00$85.00 | $23.99$23.99 | $25.99$25.99 | $51.99$51.99 | $24.99$24.99 | $22.05$22.05 |
Delivery | Get it as soon as Monday, Apr 1 | Get it as soon as Monday, Apr 1 | Get it as soon as Monday, Apr 1 | Get it as soon as Monday, Apr 1 | Get it as soon as Monday, Apr 1 | Get it as soon as Monday, Apr 1 |
Customer Ratings | ||||||
Value for money | 4.4 | — | 4.5 | 5.0 | 4.4 | 4.3 |
Easy to install | 4.8 | — | 4.0 | — | 4.7 | 4.7 |
Instruction quality | 5.0 | — | — | 4.0 | 4.4 | — |
Sold By | JayCorp Automotive | SiShuo-US | Yuxuan Online Store | Mendota Merchants | Inverters-R-US | Amazon.com |
coil voltage | 12 volts | — | — | — | 12 volts | 12 volts |
operation mode | Automatic | — | Automatic | — | Automatic | Off |
Similar items that may deliver to you quickly
- Mata1 Dual Battery Isolator Kit 12V 140Amp IP-67 Waterproof Rating VSR (Voltage Sensitive Relay) Smart Car Charger for All Automotive Land or Marine VehiclesAmazon's Choicein Battery ChargersFREE Shipping by AmazonGet it as soon as Monday, Apr 1
- MaySpare Dual Battery Isolator Kit 12V 140Amp Voltage Sensitive Relay VSR Double Battery Automatic Charger & Wiring Cable KitAmazon's Choicein Automotive Replacement Battery Relocation KitsFREE Shipping by AmazonGet it as soon as Monday, Apr 1
- Spartan Power Smart Dual Battery Isolator 12V 140A Voltage Sensitive Relay VSR for Vans, Trucks, RVs, Motorhomes, ATV, UTV, Boats, Off Road VehiclesAmazon's Choicein Automotive Replacement Battery SwitchesFREE Shipping on orders over $35 shipped by AmazonGet it as soon as Monday, Apr 1
- GEARZAAR Dual Battery Isolator, 12V 140Amp Battery Isolator Voltage Sensitive Relay VSR Automatic Battery Smart Battery Isolator for Car Boat RV ATV UTV MarineFREE Shipping on orders over $35 shipped by AmazonGet it as soon as Monday, Apr 1
- Dual Battery Isolator 12V 80Amp, Voltage Sensitive Relay VSR,Compatible with Polaris, John Deere, All Brand of UTV ATV Motorcycle Yamaha, Kawasaki Honda,Not Fit for Lithium BatteriesFREE Shipping on orders over $35 shipped by AmazonGet it as soon as Monday, Apr 1
- Stinger SGP32 200 AMP Battery Relay Isolator and RelayFREE Shipping by AmazonGet it as soon as Monday, Apr 1
Product Description
A smart isolator is the ultra-simple and most technologically advanced method of automatic battery isolation. 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. The small size and rugged construction of these units allow for quick simple installation for even the most novice DIYer. The smart isolator is also “Dual Sensing” which senses the charge of both batteries. If either battery is receiving a charge, e.g. a battery charger is connected to the auxiliary battery; the relay will engage and charge both batteries. The advanced technology always insures that the first battery is fully charged (13.4v) before connection is made to the second battery. This prevents problems that may result from your charging source being too low in amps to charge all batteries as once. If placed in linear sequence between each battery the isolator units can provide proper charging for several batteries in a multiple battery setup such as in larger boats that may have 2 or more house batteries. How it works: The smart isolator allows two batteries to be charged at the same time. When the engine is started and either battery reaches 13.4 volts, the relay engages, allowing two battery banks (start and accessory) to be charged simultaneously. When the voltage drops below 12.9 volts (eg the engine is stopped), the relay disengages, separating the batteries. This system eliminates the possibility of draining the start battery and protects sensitive electronic equipment powered from the house battery from harmful engine start up spikes.
Product information
Technical Details
Additional Information
ASIN | B00400IYTK |
---|---|
Customer Reviews |
4.6 out of 5 stars |
Best Sellers Rank | #113,770 in Automotive (See Top 100 in Automotive) #472 in Battery Chargers |
Date First Available | August 18, 2010 |
Warranty & Support
Feedback
Looking for specific info?
Customer reviews
Customer Reviews, including Product Star Ratings help customers to learn more about the product and decide whether it is the right product for them.
To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyzed reviews to verify trustworthiness.
Learn more how customers reviews work on AmazonCustomers say
Customers like the performance, ease of installation, battery life, and quality of the relay. For example, they mention it works well, is easy to follow directions, and keeps both batteries charged. That said, opinions are mixed on value.
AI-generated from the text of customer reviews
Customers are satisfied with the performance of the relay. They mention that it works well, has no issues, and is perfect for battery isolation. Some say that the battery sensor works great as well. Overall, most are happy with their purchase and recommend it to others.
"...told by many old school camper guys this setup wouldn't work, but it works great! The VSR is small and lightweight, and simple to hookup and use...." Read more
"Worked great while it lasted ... about two months into operation I serviced my truck myself during which I disconnected the negative battery pole..." Read more
"...I have tested it with my volt meter and thus far it has worked perfectly...." Read more
"...on if it would work with the type of alternator I have but it worked great...." Read more
Customers find the installation of the relay to be simple, easy to follow directions, and easy to connect.
"...The VSR is small and lightweight, and simple to hookup and use. It has one simple LED light letting you know where it's sending voltage...." Read more
"...than a conventional battery isolator but it is smaller and easier to connect...." Read more
"...Im an idiot with electricity but the instructions are straight forward." Read more
"It was easy to install and it has been working like it's supposed to so far have it installed on sxs so we see if it stays good?..." Read more
Customers are satisfied with the quality of the battery isolator. They mention it's reliable, simple, and well-made. Some say that it'll be a great addition to your vehicle's battery system.
"...Either relay looks to be a great solution for battery isolation." Read more
"great isolator for second battery, really works- no bleed back after 6,000 milesWould get a 5**** if it had mounting lugs...." Read more
"...draining the auxiliary batterie on a horse trailer, the smart battery isolator was perfect for splitting those two circuits when not charging and..." Read more
"...The unit installed easily and is functioning as designed. Very well made." Read more
Customers like the battery life of the relay. They mention that it works as advertised, keeps both batteries charged, and provides power for a couple of days. It also prevents power surges, which can destroy your engine.
"...Truck battery stayed full too. Im an idiot with electricity but the instructions are straight forward." Read more
"...But it works as advertised and does keep the batteries properly charged...." Read more
"...This unit will also prevent power surges which can destroy your Engine Management Computer, this can happen when you use a plain relay to isolate..." Read more
"...for a long time because the 2nd battery was ruined and would no longer take a charge. I emailed the manufacturer (TRUE) to ask for help...." Read more
Customers are mixed about the value of the relay. Some mention it's very good for the money, while others say it'd be better spent helping others.
"...Li-Ion jump starter packs are super cheap and more useful for helping others anyway." Read more
"...It is a little more expensive than a conventional battery isolator but it is smaller and easier to connect...." Read more
"Good value and works well for the past month" Read more
"Very good for the money..." Read more
Customers are mixed about the size of the relay. Some mention that the small size and plastic enclosure make fitting it in the little, while others say that the lugs and studs are too small on the back.
"...The VSR is small and lightweight, and simple to hookup and use. It has one simple LED light letting you know where it's sending voltage...." Read more
"The studs are too small on the back and they are too close to the openings. Makes it really tricky to put 6 ga. battery lugs on." Read more
"...As much as I like this device, it's functionality, size, and even the design..." Read more
"...would typically install to battery post in a boat and it comes with a lug that is too small. Maybe a little longer as well...." Read more
Reviews with images
-
Top reviews
Top reviews from the United States
There was a problem filtering reviews right now. Please try again later.
Word of note: I did have to trim some of the plastic away where my wires run in and out of the unit. It's 2 pieces and you have to trim away part of the cover if you're using proper gauge wire to get it to sit on the base correctly. This will make sense when you see the unit in person, and it's pretty obvious the manufacturer intended for you to cut or drill depending on your application.
EDIT: I was wrong, and I'm sorry. While working on the truck I discovered something that a friend changed in the wiring that I was not aware of during the job mentioned above ... after fixing that issue the Smart Dual Battery Isolator came back to life and all is well. So I admit to my mistake in accusing this product of not working properly when in fact it did and it was my bad.
There is an option to buy this same VSR with a kit, but I opted not to buy the kit because I needed higher gauge wire, and I could get it at a lower overall cost. Because of the thicker wire, I had to modify the wire inlets a little, but it was easy. I would recommend this product to anyone looking to isolate a battery.
However, I went to do some work under the hood recently, and noticed that the plastic housing had become very deformed in the 4 years since I last took a close look at it. It's all droopy and no longer anything near square. It was mounted under the hood, but not particularly close to the exhaust. It shouldn't have gotten any hotter than any component under there. To the manufacturer's credit, it's still working like a champ. I'm not going to remove it from the system, as it's still going strong. But I would recommend not mounting in a place that's likely to see high heat.
I wouldn't hesitate to buy another, provided I wasn't mounting it under the hood of a car.
I tried three different isolation relays, two of which looked pretty good. The Stinger SGP32 was the best, because its coil current was lowest. But then further searching brought me to this relay, which works with a clever design using voltage rather than just an ignition circuit. I ordered one of these and the Keyline Smart Battery Isolator, which also looked good. When I received them from amazon I found them to be almost identical in design, and upon bench testing they both worked perfectly. I ended up keeping the Keyline product and returning this one, but only because I liked the small red LED a bit better than the bright blue LED on this product. Either relay looks to be a great solution for battery isolation.