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Hellroaring Technologies, inc.

Polson, Montana  -  USA

Our Efficient Battery Isolation Page 

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Remote Module
4 Wheel Drive
Custom Truck Applications
Camper/Trailer Applications
Car Power Audio
Marine Applications
Why Hellroaring!
Battery Tips

Battery Isolator / Combiner Models:

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Application Notes for:

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Efficient Battery Isolation!

With this installation configuration, you will achieve isolation between your starting battery and deep cycle battery systems.   When the engine is running with alternator in regulation or  when an external charge source is applied to theBIC-75150A-kit-small.jpg (21503 bytes) Auxiliary Battery, both batteries will receive a charge automatically.  All of your heavy auxiliary load currents will go directly to your alternator output for the most efficient transfer of energy.   Only the current required to recharge your starting battery and operate the vehicle will go through the battery isolator/combiner.   With the BIC-75150A low ON resistance, you will achieve fast, efficient charging of both batteries without diode losses!


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  • Optimized for Maximum Amplifier Current with starting battery isolation.
  • No diode voltage drop effect when ON!   Very low ON resistance (less than 0.008 ohms!)
  • External solenoids NOT required.  
  • Compatible with very high output alternators (even 300 Amp).
  • Easy, simple to understand, installation!  
  • Simple automatic charge/isolation operation!   Virtually free of human intervention!    No hassle, worry free.
  • The Hellroaring BIC-75300A and BIC-75150A limit inrush currents when switching.    No arcing contacts to wear out!
  • Very compact size (3" x 4.75" x 2.0").
  • Excellent for extreme cold weather starting.   Simply switch ON the Remote Switch function for a starting boost.
  • The Remote LED will give an indication that alternator output is exceeded.
  • Low Cost.


  • You can not crank your engine with the auxiliary battery if your main battery develops an open circuit at the main battery terminals due to corrosion or other cause.

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Copyright 1998-2008 Hellroaring Technologies, inc.
Last modified: 1/5/2008