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

I was looking for a good quality relay to be used in my Chevy truck to isolate an auxiliary battery. My OEM relay failed, but it was 30 years old. The auxiliary battery is used as one of two batteries for my pickup camper - one is in the engine compartment and the other in the camper. I tried three different isolation relays, two of which looked pretty good. The Stinger SGP32 was the best, since it drew the least amount of current when activated. 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 Jaycorp 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 the Jaycorp relay, but only because I liked the small red LED a bit better than the bright blue LED on the Jaycorp relay. Either relay looks to be a great solution for battery isolation. If this Keyline product proves reliable, I'll be a very happy camper! Update 8/3/21: This isolator has worked perfectly since I installed it. A 5 star product!

This was purchased to isolate an RV auxiliary battery used for starting the generator from the start battery bank for my engine. The original design had these two batteries banks connected together for charging purposes, but not isolated. Since the auxiliary battery was a smaller capacity battery it could drain the chassis battery during long storage periods leaving me with a dead chassis battery. Now with the battery isolator the two batteries are disconnected from one another unless the engine alternator, or other charging source, is supplying a charging voltage to the chassis battery. The battery isolator then applies the full charging voltage to the auxiliary battery, when needed, allowing it to recharge . Diode isolators have been used for this purpose and work ok, but they have a voltage drop across the diode which limits the charging that can occur. Diode isolators are solid state devices and can be susceptible to voltage spikes. This device is a much better solution. its rugged, delivers a full charging voltage to the load battery, and isolates the charging source battery when there is no charging voltage being applied. No dead battery after 6 months of winter storage.

I installed this on my UTV and it works perfectly. When I have all my lights going at night and the fan kicks on it closes the isolator so I don't have such a load on the stator. I'd give it 5 stars but the ground wire wasn't attached very well and easily broke off. Easy fix, but still the solder job should of been better.

Worked perfectly.

Problem I have is that even if the Aux-Batt terminal is connected to a battery and the Main-Batt terminal is floating it will still cut-in even at 13.25V Aux batt voltage as measured with a Fluke. So it constantly drains the aux battery until cut-off at 12.7V. I also tested the internal relay function on the Main terminal and that work identically. So the problem is that both terminals are activating the relay so the isolation never happens and the parasitic draw of the isolator itself will drain the batteries until 12.8V. Return window closed a few days ago so this is now e-waste

Took roughly 15 minutes to install this Isolator in our camper van and could not be more pleased. We were having issues in the rain keeping our batteries charged with solar and this is an amazing alternative when we drive to our next location. It is quiet and was the simplest electrical setup. -Came with easy to read/ fool proof directions. -Had LED light to show you if its charging -Small and compact, we installed in under our driver seat in the camper van For under $100 it is well worth the bonus battery charge and safety in those long rainy weekends. I have already had 3 of our friends get this after seeing it in our van, I highly recommend this to anyone who needs some extra juice or wants some safety in a backup to solar. If you drive your van a lot this would even work instead of a solar system. Great product!

Had a Redarc that failed just when I needed it most (in the middle of nowhere in a foreign country with no expedite delivery) This unit does same job, 1/3rd of cost so you can carry a spare and still save some money. Easy to install and functions as it supposed to so far.

This product says it charges all batteries. But Lithium Ion batteries have a charge profile. Typically, its about 14.4 Volts. A vehicle alternator is below that. Also there is no limit on current limit other than a fuse. However its okay as a battery isolator in conjunction with a dc to dc charger. I installed it as a alternator detector that switches on when vehicle running. It then connects to dc to dc charger which also then switches on when vehicle is running. The dc to dc converter needs a ignition ON signal, but to get that you only need to connect the (+) input from battery to D+ input on dc to dc charger (little red wire in photo 2). A 6 inch jump with a 16 gauge wire . Also with current limit (20 amps on dc to dc charger), you don't have to run a super low gauge wire from battery ($$$). My isolator is about 14 feet away from battery. I just ran a 6 gauge wire from + battery terminal on vehicle to (+) terminal of isolator. For the (-) terminal all you need is a chassis ground near dc to dc charger. You don't have to run a low gauge wire back to battery because vehicle is grounded to battery. When you do a jump start to can just clip black lead to any metal part on the car. Same idea.

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.

Efficace pour ne pas décharger la batterie de démarrage

Parfait fonctionne très bien.

J aimerais avoir de l aide parceque mon isolateur mes ma batterie a terre je voudrais contacter un soutien tecnique ou ces mon modul qui est defectuer merci pourtant ca l ai simple a instaler le pouint rouge baterrie principace le fils noir groud body et l autre gros fils baterie oxyliaire