Dual Battery Isolator Kit 12V - 140 Amp Voltage Sensitive Relay (VSR) for Dual Battery Setup - Automatic Disconnect Switch for Car, Truck, RV, UTV, ATV, Marine

It works perfect I just put it on a big truck to have a backup battery for a power inverter that is installed for power tools and it works perfectly easy to install the quality looks pretty good includes everything you need and your battery terminals you may have to fill the hole biggers on the tips but other than that everything fits good

Worked perfectly.

Why did you pick this product vs others?: Easy to install for my boat. I wanted something to isolate my starting battery from my battery that mainly runs my radio, so we can start the boat after floating and listening to the radio. I originally had an A/B/Both manual switch, that was hard to access. Now I can have enough left in one battery to get it started and not worry about flipping a switch or remembering to parallel them to charge them back up. The only thing about the install I didn’t like was having to trim out the side of the switch for the cables to route through. My boat alternator is rated for 65 amps, so this should handle that load without a problem.

This works well but the connections are very close together kinda made it difficult to install 4ga wire

Thus far: Install was easy enough, especially if you have experience with audio equipment. Please ignore my lazy cable management (i haven't completed the build) Product cuts in when alternator is on and cuts out at 12.8v like it says (tested with multimeter). If you do what i did you will need 1x more 6 (couldn't find 7) gauge battery terminal connectors. You will also need more heat shrink tube, just buy a length of it at 6 gauge. Tools you will need: Rachet set (varied sizes for bolts/nuts) Razor blade (stripping 7 gauge wire (or if you're fancy you can buy a fancy smancy stripper)) Some kind of Wire cutter, i used a simple wire cutter. Crimp tool (i used wire cutter ^) Heat source for heat shrink (i used propane torch) Multi meter (for testing grounds and voltages) Anti Seize for connections (not necessary but very good investment) 12v Battery (preferably deep cycle with 100Ah) 12v Battery clamps, (see in pic 1/3 in the center of battery) was like $6 at O'Rielly's Auto. Flat head for prying those snap cap thingys. Make/Model: 2014 Chevy Silverado 1500 LT Battery: SuperStart 27 ($92 O'Reilly's) My Install: I took the 20ft cable and split it, running one for positive and one for negative to connect to the starter battery. I took the included 2ft Ground battery and grounded to the engine block (see image 2) Cut more of a hole than prescribed in the directions for the Isolator housing for the entry/exit cable holes (^You'll see why) I took a cylinder sanding wheel with a dremel tool to sand paint away from part of the cab near the isolator for the isolator's 16-ish gauge ground and used a machine bolt for the fasten. Used battery clamp/hook system to fasten battery to tray (forget about the chevy clamp, this is better) Will update every few months

Ive had this in my Polaris ranger 2016 900-5 crew, for about 8 months. I have 2, 1200 Odyssey batteries installed. This thing works like a champ. It passes the charge to the battery that needs it the most. I tax my system more than most people ever will, and this isolator does more than I need it to. You have to understand your setup and how it all charges or you wont understand how this thing works. I have 2, 54in curved 4D light bars, and 2, 50in curved 4D light bars, along with 2, 7in light bars, and in cab, mulit color lights. I can run all night on my setup. I can hunt 3,000+ acres, for over 8 hours without any issues. I can hear the isolator clicking back and forth, and I can watch my voltage move around. I never drop under 10 volts, on a full load, and that is after all night of hunting. It would of been nice to have longer and better neg and pos. cables, but because of all the other work done to the Ranger, I did have better cable laying around. Others will not have the same luck. So a tip to the seller. Just give the better, longer cables. It wont cost you that much more, and honestly even if it does, I would of paid to have the better cables. Outside of that, I didn't buy this for the cables. I needed the isolator, and it is great quality, and works flawlessly.

Worked as advertised

I went through two units in a row, and both had serious issues. The first one would never shut off once the battery started charging—stayed on indefinitely, even after charging stopped. The second unit worked briefly (around 4 hours), where it would take 3 minutes to activate, then 10–12 minutes to shut off—but the next day, same issue: stayed on permanently, regardless of battery state. It seems like the voltage sensing is inaccurate, especially when the batteries are fully charged. In both cases, the isolator failed to do the one job it's supposed to: manage the battery connection reliably. I ended up replacing it with a Stinger manual relay, which works perfectly. Simple and dependable. These Key Line isolators were totally useless in my setup.

I'm an amateur radio operator and I utilize a house lithium battery to power the radios. The only way I could get my 2011 F-150 to charge both batteries without causing an issue with the battery management system. And you can't parallel lithium with a flooded AGM or flooded lead acid battery together they must be isolated. I've tried a number of different methods to no avail till I tried the Smart Isolator. And it works just lovely and keeps both the start battery and the lithium house battery fully charged.

I installed on a Kubota Diesel side by side … works great to know you will not deplete primary battery … great price , instructions were easy to follow …

Works great so far. Easy install. A longer ground cable would make it a pefect kit

Parfait fonctionne très bien.

I have used this smart isolator on my house batteries in my van . It runs from the main battery to the ones in the van, which are AGM , and have had no issues so far. I am switching out my AGM batteries to one lithium 300 amph . Just a wondering or is will work for the lithium and not damage them ? Thanks in advance