Smartpass 120T is a 24V multifunctional power management solution and split charging system for dual battery systems with starter battery and service battery. Smartpass 120T distributes, controls, and maximizes the available energy from your alternator to service battery and electrical consumers.

Part no. 40-329


24V | Onboard power management for 24V service battery systems

Smartpass 120T is to be used in applications where the alternator gives is able to deliver the desired charging voltage and the service battery has many parallel consumers with average load greater than 10A. The battery guard function in Smartpass 120T will turn off equipment connected to consumer output when service battery voltage is too low, this protects the service battery from deep discharge and will increase lifetime of battery. To maximize the split charging process Smartpass will supply power to the connected consumers directly from alternator when motor is running. Smartpass 120T ensures a safe operation by safety features as Battery temperature protection, Dynamic overcurrent protection and Over temperature protection.

SUITABLE FOR Heavy Vehicles, Boats, Recreational vehicles, Busses, Transport trucks and all other vehicles with a 24V dual battery system.

Technical data

22,8-32 VDC
Max 120 A * (consumer output max 100A)
Battery capacity
28–800 Ah
Charging category
DC charging
Back current drain*
Corresponding to less than 10 Ah/month
Battery voltage
24 V
Battery chemistry
Lead acid
Ambient operating temperature
-20 ˚C to +50 ˚C (- 4 °F to +122 °F)
Battery types
24 V:; WET; MF; Ca/Ca; AGM; EFB; GEL
Degree of protection
Gross weight (unit in box)
0.9 kg
Dimensions (L x W x H)
192 x 110 x 65 mm
Net weight (unit with cables)
0.7 kg
2 years
*) Back current drain is the current that drains the battery if the charger is not connected to the mains. CTEK chargers have a very low back current.
CTEK issues a limited warranty to the original purchaser of the product. Depending on the product, the limited warranty period will vary. The limited warranty is not transferable. The warranty applies to manufacturing faults and material defects. The warranty is void if the product has been handled carelessly or repaired by anyone other than CTEK or its authorized representatives. CTEK makes no warranty other than this limited warranty and is not liable for any other costs other than those mentioned above, i.e. no consequential damages. Moreover, CTEK is not obligated to any other warranty other than this warranty.