Sterling Power 12V to 48V DC-DC Battery Charger - 120 Amp

12-volt to 48-volt battery to battery charger (DC-DC charger) that enables you to charge a 48-volt battery bank from a 12-volt vehicle battery.

Charges your house battery bank at up to 1,500 watts!

Input: 9–16 volts, 115 amps

Output: 26 amps at nominal 48-volt

Bi-directional design enables up to 40 amps of charging from the house battery bank to the vehicle battery for maintaining the vehicle battery (see details in the description below).

Buck Boost design, offering high efficiency (95–98%)

By default, the unit will charge at 100% of its charging current capability but you can adjust the charging current down between 85% to 65%.

Smart Alternator/Euro 6+ compatible

The unit can be turned on with either an ignition-switched trigger wire or “vibration sense” mode.

6x preset battery type charging profiles.

Great complement or backup to a 48-volt secondary alternator power system if your battery bank can accept the additional charging current.

Optional Remote Control available separately

The BB1248120 is able to charge in both directions - from the vehicle battery to the house battery bank as well as from the house battery bank back to the vehicle battery. As long as the house battery bank is over 13.2V (13.5V if lithium) and the vehicle battery is below 13V the battery to battery charger will allow approximately half current to flow back to the vehicle battery up to about 13.4V (float voltage). This unique feature allows the vehicle/starter battery to remain topped up when there is surplus energy in the house battery bank. Best of all, this feature will NOT drain your house battery bank. Instead, it only uses surplus power. Once your alternator / engine turns the unit will revert to normal charging of the hosue battery bank. This mode can be disabled, but is on as default.

Self recovering protections:

• Under voltage protection

• Input over voltage protection

• Output over voltage protection

• Over current protection

• Charge over temperature

Other specifications:

Operational temperature: -20 deg C -> 60 deg C

Cooling method: thermostatically controlled

Fan: variable low speed

Dimensions: 10.6" x 5.1" x 2.9" (270mm x 130mm x 73mm)