Welcome to the Sterling Power Products BB1224120, the 12V to 24V battery to battery charger (120A input rated) is a device typically installed between a starter battery (input) and a house/domestic/service battery (output). The BB is designed to utilise your alternator whilst your engine is running and transfer an optimised charge to your rear batteries. It is designed to work with vehicles (old/new) and (boats old/new). We recommend on all BB systems to have an alternator that is at least 20% more powerful than the BB input demand, so as to protect your alternator from being overworked.
The unit is simple to install and has capacity to charge multiple battery profiles including lithium.
Smart Alternator/Euro 6 compatible
– Ignition feed or Vibration Sense modes
– 6 pre-set battery types
– 6 self recovering protections
– Low temperature trip for Lithium Ion batteries
The BB1224120 is able to charge in both directions. Provided there is over 26.4V on the leisure battery (27.0V if lithium) and the starter battery is below 13V the BB shall allow approximately 40A to flow back to the starter battery up to about 13.4V (float voltage). It simply allows the starter battery to remain topped up when there is surplus energy in the domestic battery. This feature will NOT drain your domestic battery – it simply takes surplus. Once your alternator / engine turns on or you provide the BB with an ignition signal the BB reverts to normal charging of the leisure battery. This mode can be disabled, but is on as default.
This is ideal for allowing the starter battery to remain topped up when you have solar / wind / charger – charging up your leisure battery.