500 Amp Relay Isolator (BIR500)

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Isolate with Confidence

The NXV BIR500 Isolator is the perfect solution when adding a secondary battery to your audio system. It allows the second battery to be fully dedicated to the sound system and does not create a voltage drop like common isolators tend to do. The isloator will draw less than 1 amp when your vehicle is powered on. All of this will ensure that your battery will be isolated with confidence!

Product Features:

  • Mobile Audio Relay and Battery Isolator
  • Great for isolating a second batter making it dedicated to the stereo system
  • Does not create a voltage drop to the second battery like conventional isolators
  • 500 Amps at 12V Continuous Power Handling
  • 700 Amps Surge Power Handling
  • Switching Power: 10 - 16 VDC
  • Draws Less Than 1 Amp When On
  • Authorized Internet Dealer
  • 1-year Manufacturer's Warranty

Battery Isolator Features

Compatible Amperage
This is the total number of amps that the battery isolator is designed to continually receive.
500 amps
Surge Amperage
This is the total number of amps that the battery isolator is designed to receive on a surge of power.
700 amps
Isolator Type
This specifies whether the isolator is a switch/relay type isolator, or a diode isolator. Relay isolators will maintain a higher charging voltage, while diode types will offer true isolation and improved reliability.
Relay (Solenoid)

Specials with this Item

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Warranty and Return Policy

Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider

Summary of Customer Ratings & Reviews

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Browse 6 questions and 50 answers
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Why did you choose this?
Sonic Electronix Store
ur ok
Adam F on Aug 9, 2017
Referred by my audio installer
Shawn W on May 28, 2017
I used this item to isolate my battery for when the vehicle is not in use
scott z on Jul 14, 2017
adding a second battery to my vehicle
Nicole M on Apr 14, 2017
dose it help out when having a 3000 watt amp hook't up dose it act like a small alternator I don't know much of this product so if you know help full hint's please let me know???
revis on Aug 11, 2014
Best Answer: This is pretty much a big Relay switch. Mainly to be used in between 2 or more batteries. Install your power wire and fuse it as close to your main battery, run the power wire to this Amp Relay, install another power wire to this relay, fuse it next to your second battery and hook to second battery. Follow the instructions on wiring.......with this being said, technically you really do not need an isolator unless you plan on running your audio equipment or anything else after market with the engine off.....with the engine on, this relay allows a charge from your alternator to both batteries, whereas when you turn your engine off, this isolator "disconnects" the second battery, thus allowing you to use your second batter as long as it can go, without draining your main battery, allowing to still start your car. If you're going to SPL application, don't bother with this as you'll have more resistance, if you're going for more subtle, SQ or car show application, it won't hurt anything and also allows more security, just make sure you ground everything properly. But if you are running a 3000w amp, (assuming that's all) technically don't worry about this isolator unless you play music with engine off, to make sure this particular "500 amp" isolator is enough, basically figure out how many amps you'll be needing from your second battery as well as what you alternator can handle. I bought this, but I ended up never installing it or using it at all, mainly b/c I was planning on an SPL application, but now I'm re-doing my entire set up, so I'll probably use it....

I hope at least some of this information helps....Keep in mind, when installing anything electrical, especially batteries, amps, and alternators, you should ALWAYS be safer by adding extra security, even if someone says it's overkill, I would rather replace a bunch of fuses rather than my entire vehicle and set up. Do your research on this, look at review and youtube reviews, they do help
Reply · Report · James P on Aug 13, 2014
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Do i have to hook the 12v switch to the ignition so it turns on only when in run position or can i hook it up to the accessory wire so it turns on at every position, like how my amps for my stereo are? I just dont want main battery to die when listening to stereo. And what gauge wire would be recommended for the 12v switch?
Steven S on Mar 30, 2015
Best Answer: Either or, your choice. As long as your not hooking it up to a 12v constant your fine.
Reply · Report · Alexander K on Mar 30, 2015
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i have a duralast gold as primary battery and i am trying to add a kinetic hc600 in the back of my 08 accord stock alt 0g wire, for amp i have a RE Audio ztx-5000.1 for an orion hcca 122 would this isolator help me conect both batteries to power my system? can this isolator be placed in the back with my second battery (hc600) or is require to be at the front?
mayitodmngz m on Jan 8, 2015
Best Answer: I think it would be easier to place it in the front and have it accessible since this isolator has a switch and tends not to last as long as a regular isolator. But i got this one and am extremely happy with it. It would go perfectly with ur set up. I have similar set up. Very easy to install. Just make sure u set up ALL your amps to the rear battery so that when the car is off, the isolator will seperate the batteries so ucan listen to your system when the car is off withoit draining your front battery. Then when your car is on, the isolator will switch and then flow thw alternator charge to your rear battery. Good luck!
Reply · Report · zedrik j on Jan 8, 2015
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i am runing 20000 watts off my amps, will this help or will i need a bigger one?
A shopper on Aug 26, 2014
Best Answer: The manufacturer's specs state that this device is rated to handle 500 Amps constant and 700 Amps Surge (both at 12V). This means it can handle 6000 watts constant and a 8400 watt surge (volts x amps = watts). If you are seriously running 20,000 watts rms, you may wish to consider other options, because at 12v you would be pulling 1,667 amps, and at 14.4v you would be pulling 1389 amps. I assume that instead of power cables you are using solid buss bars?
Reply · Report · JULI H on Aug 27, 2014
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Can this be used to isolate self-exciting alternators from batteries? I don't want them to be active all the time.
Alex P on Sep 23, 2015
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Best Answer: Alex,
As this is nothing more than a beefy relay, it absolutely can be used to isolate an alternator (or any other electrical device) so long as it does not exceed the relay's continuous power handling capability (500 Amps in the NVX BIR 500). You would be hard pressed to find an alternator that exceeds 500 Amps though.
Reply · Report · JULI H on Sep 24, 2015
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Sonic Electronix Wiring Guide

Wiring Diagram Legend

Warning: The image depicted shows the resistance change when wiring multiple subwoofer terminals. Please refer to your subwoofer's owner's manual for the proper wiring of its terminals. Sonic Electronix, Inc. is not responsible for damage caused to your audio system or vehicle due to improper installation. Please call tech support at 1-877-289-7664 if you require additional assistance.

Product Name: NVX BIR500-OPEN BOX