The National Luna Intelligent solenoid has been designed to be a compact, automatic, parallel split-charge isolator for motor vehicles. The product features intelligent control electronics and a low-loss, high-current solenoid rated for extreme environments. Installing the Intelligent solenoid is simple and can piggy-back off the vehicle's main battery without any ignition tapping, ensuring that existing vehicle wiring is not tampered with. The Intelligent Solenoid is supplied as a fully-functional split-charge isolator, no cables, batteries or other hardware is supplied. Battery monitor, lugs, cables and batteries are available separately. 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 .