-  12 Volt or 24 Volt automatic voltage selection.

-  Totaly automatic operation - does not require ignition feed. When the primary battery exceeds 13.3v the VSR assumes that the charging device (engine/alternator) is active and engages relay to connect mains to the auxiliary battery bank(s) to charge. When the voltage of the primary drops down to 12.9v the relay disengages and prompts the charging of the primary battery, hence ‘voltage sensitive’.   

-  The VSR therefore ‘saves the day’, when the engine is ‘off’ and you attempt to run a 2000W appliance (bow thruster/anchor winch) from a depleted auxiliary battery bank the relay will latch and prevent you withdrawing circa 200A of current from the primary (engine starter battery), thus engine starting is always possible.

-  Bi-directional charging, this functional allows the charging from primary to auxiliary and vice versa allowing the maintenance of potentially 13.3v on all banks.

-  Auto 12/24v selection, if it senses 4v to 16V = 12V   &   16v to 30V = 24V

-  Very easy to install.

-  Ideal for charging a secondary battery bank from a battery charger with only one output such as: a combined inverter/charger (ProCombi).