Voltage Sensitive Relay (VSR) 12VDC for Battery Isolation - Auto/Boat/RV

I purchased this VSR to isolate a battery in my truck camper. It is a little more expensive than a conventional battery isolator but it is smaller and easier to connect. I have tested it with my volt meter and thus far it has worked perfectly. It turns on at 13.3 volts (which protects your aux battery from being used as a starting battery by switching on only once the staring battery is fully charged). And cuts out at 12.8 volts (which keeps you from draining your starting battery when using your aux battery without the engine running). A nice feature is a little LED light that indicates when it's engaged. Also, it's rated for 140 amps, which is well over my electrical needs.

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.

I am using this in a Ford e350 van, converted to a camper, to maintain the truck battery under the hood and maintain 2 deep cell marrine batteries in the back, which i run a fridge/micro, etc. with using a 1500 watt inverter. I was 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. It has one simple LED light letting you know where it's sending voltage. Proper gauge wire is imperative, i have 6 gauge run to all batteries, with a 150 amp ANL fuse, and have had no trouble at all with this unit. I returned a much larger, heat synced Northern tool unit after i saw the difference in size. This one is great under the hood of a van or any tight space.

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.

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Worked as descripted for six months without any problem charging auxilary battery when depleted and protecting the main one from discharging during stationnary period.

Seem to be a good and reliable product..

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For it being 2 simple voltage sensitive relays it is a little pricey at $75 bucks. But it works as advertised and does keep the batteries properly charged.

The only issue I see is that till all batteries in the system drop to about 12.7 volts it does keep them connected. I have mine on a diesel pick-up. I will have to place a heavy diode in the wire somewhere or a switch of some type in the winter due to the truck really needing the 13.3 volts the start batteries have without this slight issue.

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