Split Charge Relay and a DC-DC charger

A Split Charge Relay and a DC-DC charger are both devices that can be used to charge a leisure battery from the power of the vehicle's alternator whilst on the move. However, there are some key differences.

A split charge relay

A split charge relay is a simple device that works by sensing the voltage of the starter battery. When the voltage of the starter battery reaches a certain threshold, the relay closes and connects the leisure battery to the alternator. When the voltage of the starter battery drops below a certain threshold, the relay opens and disconnects the leisure battery from the alternator. Modern vehicles with smart alternators can only be used with B2B chargers as split charge VSR are not suitable

DC-DC charger

A DC-DC charger is a more sophisticated device that can provide a more controlled and efficient charging of the leisure battery. DC-DC chargers typically have a number of features that can improve the charging performance, such as:

• Automatic voltage sensing
• Temperature compensation
• Overcharging protection

When choosing a B2B charger, it is important to consider the size of your leisure battery, the amperage of your vehicle's alternator, and the type of charger you want. It is also important to make sure that the charger is compatible with your vehicle's electrical system.