The E&J Smart DC-DC charger is an build in bluetooth function adaptive 3-stage charger (bulk – absorption – float) ,it is designed for dual battery systems, such as in vehicles or on boats where the starter battery and alternator is used to charge the service battery.  where the charger can be monitored and configured via Bluetooth and can be remotely controlled via a remote display and has an engine running detection mechanism and also by engine vibration. The E&J Smart DC-DC charger series can be used in 12V, 24V,36V,48V,60V,72V,96V or 120V systems and is suitable for both lead acid and lithium batteries. Models are available up to 1500W and unlimited multiple units can be connected in parallel to increase output power.