The voltage sense relay simply detects the rise in voltage from you vehicles charging system when it exceeds 13.3v to allow you to charge your leisure battery(s) while your engine is running. When your engine is switched off and the battery voltage drops below 12.65v the relay will isolate your leisure battery(s) from your main starter battery so it does not drain your main starter battery and you will always be able to start your vehicle.
All of the range of 140amp voltage sensitive relays are dual sensing meaning that if a charging voltage like through a mains charger or solar panel is applied to the leisure battery that exceeds the relay activation voltage of 13.3v it will activate the relay to allow this charging device to also maintain the starter battery.
Voltage sense systems are especially suited for modern vehicles as this type of system does not need an ignition feed or any additional wiring into your vehicle but for modern Intelligent smart charging vehicles with Euro cat 5&6 engines you may need to use a DC to DC charger.
Please see our help and advice page for more information on smart alternator vehicles and battery to battery charges. HERE
For our full range of battery to battery chargers please click HERE
Our aim at Simply 12 Volt is to supply you with the best, top quality Split Charge kit available, at the best price we can. All the components in all of our split charge relay Systems are all fully E-approved and Tested top quality UK supplied parts. In all of our kits you will find everything you need plus spares to install any split charge system to any vehicle with our help and support if required.