SELECTOR SWITCH The RMS selector switch is an electronic system integrated in vehicles, and which, with the aid of the alternator, after very simple mounting, enables recharge of one or several secondary batteries intended for using a RMS-range converter, or any other equipment operating in low voltage, direct current (radio, emergency rotating light, electronic flash light etc...). It is easy to install. Being entirely automatic, its use does not require any operation. Once the ignition is switched on, the selector switch is ready to manage the secondary battery's recharging. In all applications, this will give priority to the motor battery. When the vehicle comes to a halt, its energy consumption is nil, as much on the motor battery as on the secondary battery. The advantage of its technology, with regard to the usual load transfer, is that it does not make use of the power semiconductor (diodes or transistors), and consequently, does not have the fault of carrying out a recharge with a 0.7 volt drop. In fact, all battery manufacturers stress the fact that an accumulator used in cyclical mode must recharge at a nominal voltage of 2 volts 45 minimum, per part. Thanks to its design, you can use the secondary batteries with different intensity and voltage than that of the vehicle. There are three versions :   Vehicle battery voltage  Secondary battery voltage  SELECTOR SWITCH RMS 12/12 12 V 12 V  SELECTOR SWITCH RMS 12/24 12 V 24 V  SELECTOR SWITCH RMS 24/24 24 V 24 V NB : The RMS model 12/24 makes series / parallel switching, and therefore, at the time of vehicle operation, your secondary batteries will return to a nominal voltage of 12 volts (more than 24 volt use possible). This amounts to saying, that while the motor vehicle is running, you can no longer use the 24 volts of batteries.