My experience is professional. This 500 amp continuous duty relay does not have the voltage drop that a solid state battery isolator has and does a much better job of charging auxiliary batteries through. This one had the highest amperage rating for the price. It clicks on with a very heavy and solid "thunk" like you would expect from a heavy duty solenoid.

You will need to use an AND gate with this relay, or any other such device so that it isn't energized when you have your ignition switch in the start position or the accessories position. I chose this one for its high capacity to insure a much longer contact life.

I will definitely be buying more of these for future RV and high power sound system needs and would most certainly recommend it to a friend or relative.

I Installed this product in my car 6 months ago and it works great my batterys get more than enough juice to charge them and fast...this is a great add on to multiple battery banks for any application that serves it..I love it...

Nice and durable. Feels solid. Haven't actually got it to charge my second battery yet but it does isolate them. I think it's because my car's alternator isn't strong enough. Has good connections and the ring terminals I used fit nice and snug. Had some trouble installing it myself due to a slight flaw in it's design (couldn't put bolts as close as I wanted them to be due to the cylinder being a bit too wide). Otherwise no problems.

Very sturdy, and easy installation. Have been using this for about 6 months without a relay and i have abused it and still have not had any problems!

I installed one of these on my 1997 k1500 last year and i have had. On trouble at all. I installed a backup battery and have had the main battery go dead but with this ib500 it kicked the backup battery in
and the truck started right up. These relays DO NOT FAIL!

The isolater relay has worked flawlessly for me since i have put it in my pathfinder and it was very easy to install.

After 2 years of using this it still works! Best relay isolator I ever used.

I've only had it for a couple days, but it works great so for. I tested it and lets the volts go through like I need to charge the other battery. When I turn the car on you hear a heavy click, witch I have to say I like to hear. For the price and the amp of the relay it's a good buy. I bought this one, because I want to upgrade the alternator on my car. I wish Sonic sold that too, but maybe some day.

Cheap and does what it needs to... Isolates the batteries.

Does exactly what it should