Intellitec Mv Ltd.

In many cases split charging between two banks of batteries is expected to work by simply splitting the batteries with a relay. This simply will not work as the alternator will charge the battery with the greater resistance. This is the battery with the highest charge and more often than not is the one that does not need charging. To efficiently charge two banks of batteries, time and voltage parameters need to be considered in the design of the system. The Intellitec Battery Isolator Control (B.I.C.) does just this, and prioritises the alternator output to the chassis battery. When the chassis battery is holding its own against the loads, the BIC ECU will allow the alternator to charge both batteries.

The BIC also has a boost start function. If the chassis battery has insufficient voltage to start the vehicle, the BIC ECU recognises this and parallels both the chassis and auxilary batteries together to assist in the starting of the vehicle. Charging & isolation of dual battery systems Auto auxiliary starting Easy installation Reliable Intellitec's Battery Isolator Controller (BIC) has been designed specifically for vehicles that use dual battery systems and where starting power is crucial, such as utility vehicles, 4x4's, Ambulances, and boats etc. The BIC performs two important functions. Firstly the system provides a reliable and efficient method of both charging and isolating dual batteries. Secondly if the chassis battery voltage falls below 9.0v for half a second and the auxiliary battery is above 9.0 volts, both batteries are connected to provide boost starting. The BIC charging system operates by sensing the level of voltage on the chassis 12v system. When this voltage rises above 13.3 volts for 12 seconds, as happens when the engine is running normally, the BIC ECU will close the isolator relay, providing charging current to the auxiliary battery. When the ignition is switched off, the relay will open immediately. If the voltage on the main chassis system should drop below 12v for more than two seconds while the ignition is on, the relay will drop out. This scenario could happen if the alternator could not keep up with all the loads. When the chassis voltage rises above 13.3v again, the relay will again close in two seconds to try and charge the battery. The BIC system can also provide the driver with indicator lamps to indicate whether starting was as normal, from chassis battery or was a boost start from both batteries paralleled.