National Luna Split Charge Isolator (Dual Battery Isolator)


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A compact, automatic, parallel split-charge isolator for 4x4 motor vehicles by National Luna, featuring intelligent control electronics and a low-loss, high-current solenoid.

How does the Split Charge Isolator work?

The solenoid monitors the voltage on the main/starter battery. When the engine is started, the Intelligent Solenoid directs the alertnator's output to the main battery only, so it is charged for 5 minutes before the auxiliary battery is connected and charged as well.

Installing the dual battery system is simple and straight forward. See the user manual for reference.



  • Simple installation
  • Low-loss solenoid
  • Automatic connection and isolation
  • Plug-in port for remote monitor
  • No ignition wiring necessary
  • Alternator over-load protection
  • Removed battery protection
  • Damaged battery protection
  • Short-circuit protection
  • Can be installed in trailers or caravans




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