STERLING BB1224120 bidirectional battery to battery charger 12V / 24 V / 120 A
SVB item number: 33351
Manufacturer no.: BB1224120
The highly efficient STERLING B2B chargers are characterised by their compact and lightweight design and an efficiency of between 95-98%. The option of charging the starter battery bidirectionally via the connected consumer battery enables the engine to be kept ready to start at all times. Product details
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Product data
- SVB item number 33351
- Manufacturer no. BB1224120
- Description STERLING - BB1224120 bidirectional battery to battery charger 12V / 24 V / 120 A
- Max. charging current 58 A
- Output voltage 24 V
- Input voltage 9 - 16 V
- Device type Battery-to-battery charger
- Battery type Lead-Acid, AGM, Gel, Lithium (LifePO4)
- Engine running detection Yes
- Bi-directional charging Yes
- Optional remote display/operation Yes
- Temperature sensor can be connected Yes
- Integrated fan Yes
- Bluetooth No
- NMEA2000 No
- CAN Bus No
- Width 130 mm
- Height 270 mm
- Depth 73 mm
- Weight 1.8 kg
Product details
Recharging function
The bidirectional STERLING BB chargers can charge in both directions. Provided that the voltage of the consumer battery is higher than 26.4V (27.0V for lithium) and the voltage of the starter battery is below 13V. In this case, the STERLING BB charger allows around half the current (~40A) to flow back to the starter battery, up to around 13.4V (float voltage). This ensures that the starter battery always remains charged if there is excess energy in the consumer battery. However, this function does NOT discharge your consumer battery - only the surplus is used. As soon as your generator/engine is switched on or you give the STERLING BB an ignition signal, the STERLING BB charger charges the consumer battery as before. The recharging function is activated by default, but can be deactivated if required.
The recharge function is ideal for keeping the starter battery charged at all times when you are recharging your consumer battery.
Insulation
The STERLING BB battery-to-battery chargers isolate the starter battery from the consumer battery. This protects the starter battery against accidental discharge and ensures that your engine is always ready to start.
Choosing the right STERLING BB charger
The bidirectional STERLING BB battery-to-battery charger should be rated at around 25-50% of the current output of your DC-DC converter. This will allow the converter to provide power to your mandatory loads (steering, lights, stereo, air conditioning, etc.) and direct excess power to your 12V starter battery. For example, if your converter has an output of 190A, you should use a STERLING BB1270 - this will provide around 60/70A for charging. If the entire converter is used by all the auxiliaries, the voltage in the 12V system will drop and the STERLING BB charger will naturally reduce the power during this time and eventually switch off when there is a high power demand. The STERLING BB will switch on again as soon as the voltage rises again.
Lithium compatible
Charging lithium batteries will probably exceed the charging capacity. If your converter has an output of 200A, but your lithium battery can only handle up to 100A, the converter will try to provide 200A, but the battery's BMS will trip and protect the battery from overload. The advantage of the STERLING BB charger is that it limits the current directly.
Always the right charging voltage
You receive the correct charging voltages at the auxiliary battery. Some DC-DC converters deliver a constant charging voltage of 14.7V, which may be too high for some battery types! With the bidirectional STERLING BB battery to battery charger, you always have the correct charging voltage, regardless of whether you are using a lead-acid, AGM or lithium battery.
Automatic start of the charging process
As soon as the STERLING BB charger is switched on via the ignition cable, it starts charging. Alternatively, the integrated vibration sensor can also activate the charging function after two consecutive vibration events. The vibration function makes it possible to install the STERLING BB charger without having to install an ignition signal cable. This operating mode is also suitable if you are using an intelligent generator/Euro 6 engine (or newer). Please follow the instructions regarding the vibration mode in the operating instructions.
Further advantages of the STERLING BB charger
Technical specifications
The bidirectional STERLING BB chargers can charge in both directions. Provided that the voltage of the consumer battery is higher than 26.4V (27.0V for lithium) and the voltage of the starter battery is below 13V. In this case, the STERLING BB charger allows around half the current (~40A) to flow back to the starter battery, up to around 13.4V (float voltage). This ensures that the starter battery always remains charged if there is excess energy in the consumer battery. However, this function does NOT discharge your consumer battery - only the surplus is used. As soon as your generator/engine is switched on or you give the STERLING BB an ignition signal, the STERLING BB charger charges the consumer battery as before. The recharging function is activated by default, but can be deactivated if required.
The recharge function is ideal for keeping the starter battery charged at all times when you are recharging your consumer battery.
Insulation
The STERLING BB battery-to-battery chargers isolate the starter battery from the consumer battery. This protects the starter battery against accidental discharge and ensures that your engine is always ready to start.
Choosing the right STERLING BB charger
The bidirectional STERLING BB battery-to-battery charger should be rated at around 25-50% of the current output of your DC-DC converter. This will allow the converter to provide power to your mandatory loads (steering, lights, stereo, air conditioning, etc.) and direct excess power to your 12V starter battery. For example, if your converter has an output of 190A, you should use a STERLING BB1270 - this will provide around 60/70A for charging. If the entire converter is used by all the auxiliaries, the voltage in the 12V system will drop and the STERLING BB charger will naturally reduce the power during this time and eventually switch off when there is a high power demand. The STERLING BB will switch on again as soon as the voltage rises again.
Lithium compatible
Charging lithium batteries will probably exceed the charging capacity. If your converter has an output of 200A, but your lithium battery can only handle up to 100A, the converter will try to provide 200A, but the battery's BMS will trip and protect the battery from overload. The advantage of the STERLING BB charger is that it limits the current directly.
Always the right charging voltage
You receive the correct charging voltages at the auxiliary battery. Some DC-DC converters deliver a constant charging voltage of 14.7V, which may be too high for some battery types! With the bidirectional STERLING BB battery to battery charger, you always have the correct charging voltage, regardless of whether you are using a lead-acid, AGM or lithium battery.
Automatic start of the charging process
As soon as the STERLING BB charger is switched on via the ignition cable, it starts charging. Alternatively, the integrated vibration sensor can also activate the charging function after two consecutive vibration events. The vibration function makes it possible to install the STERLING BB charger without having to install an ignition signal cable. This operating mode is also suitable if you are using an intelligent generator/Euro 6 engine (or newer). Please follow the instructions regarding the vibration mode in the operating instructions.
Further advantages of the STERLING BB charger
- Smart generator/Euro 6+ compatible
- Start of the charging process with ignition supply or vibration modes
- 6 preset battery types
- 6 self-regenerating protection functions
- Low temperature triggering for lithium-ion batteries
- Quiet due to passive ventilation
Technical specifications
| Input voltage: | 9 - 16 V DC |
| Continuous output power: | 60 A at 29 V (approx. 2,619 W) |
| Continuous input current: | 120 A |
| Standby current: | 5 mA |
| Efficiency: | 95-98 % |
| Protective functions: | Undervoltage protection Input overvoltage protection Output overvoltage protection Overcurrent protection Charging temperature exceeded |
| Operating temperature: | -20 °C to +60 °C |
| Cooling method: | Thermostatically controlled |
| Dimensions: | 270 x 130 x 73 mm |
| Weight: | 1.8 kg |
Features
Discover the features that make this product stand out. From technical details to special functions – we’ve summarized all the key information for you.
Max. charging current
58 A
Bi-directional charging
Optional remote display/operation
Temperature sensor can be connected
Systems
Product safety
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Comparison
Availability / Price
Item no.
33351
33347
33346
33348
33349
33350
Customer ratings
Output voltage
24 V
12 V
12 V
12 V
12 V
12 V
Description
STERLING - BB1224120 bidirectional battery to battery charger 12V / 24 V / 120 A
STERLING - BB1240 bidirectional battery to battery charger 12V / 40 A
STERLING - BB1225 bidirectional battery to battery charger 12V / 25 A
STERLING - BB1270 bidirectional battery to battery charger 12V / 70 A
BB12120 bidirectional battery to battery charger 12V / 120 A
BB12200 bidirektionales Batterie zu Batterie Ladegerät 12V / 200 A
Width
130 mm
130 mm
130 mm
130 mm
130 mm
130 mm
Input voltage
9 - 16 V
9 - 16 V
9 - 16 V
9 - 16 V
9 - 16 V
9 - 16 V
Height
270 mm
163 mm
123 mm
200 mm
270 mm
309 mm
Max. charging current
58 A
38 A
25 A
64 A
112 A
177 A
Depth
73 mm
56 mm
56 mm
56 mm
73 mm
96 mm
Weight
1.8 kg
0.8 kg
0.6 kg
1 kg
1.8 kg
2.2 kg
NMEA2000
Bluetooth
Battery type
Lead-Acid, AGM, Gel, Lithium (LifePO4)
Lead-Acid, AGM, Gel, Lithium (LifePO4)
Lead-Acid, AGM, Gel, Lithium (LifePO4)
Lead-Acid, AGM, Gel, Lithium (LifePO4)
Lead-Acid, AGM, Gel, Lithium (LifePO4)
Lead-Acid, AGM, Gel, Lithium (LifePO4)
Integrated fan
Device type
Battery-to-battery charger
Battery-to-battery charger
Battery-to-battery charger
Battery-to-battery charger
Battery-to-battery charger
Battery-to-battery charger
Optional remote display/operation
Temperature sensor can be connected
CAN Bus
Bi-directional charging
Engine running detection
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