• CTEK Smartpass 120S Power Manager

Power management system for starter and service batteries

Smartpass 120 is a 120A Power Management Solution which distributes, controls and maximises the available energy from your alternator to power service batteries and consumers. SMARTPASS 120 handles all 12V batteries between 28-800Ah. The Smartpass 120’s Battery Guard function ensures that critical equipment such as radio, emergency lights and navigation systems always have power and take priority when the voltage on the service battery is low disconnecting non-critical consumers. The unit’s Battery Guard will protect your service battery from total discharge and built in over temperature protection reduces charge current before the battery temperature gets too high. SMARTPASS 120 is compatible with the D250SA 20A on board charger.


  • Fully automatic

  • Maximizes battery life

  • Battery Guard to protect your secondary battery from total discharge

  • Dynamic over current protection to handle temporary inputs and outputs of up to 350A for fast charging

  • Battery temperature protection for added safety

  • Splash and dust proof (IP65)

  • 2-year warranty

Technical data

Battery capacity
28–800 Ah
Charging category
DC charging
Back current drain*
Corresponding to less than 7 Ah/month
Back Current Drain, details
*) 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.
Battery voltage
12 V
Battery chemistry
Lead acid
Ambient operating temperature
-20 ˚C to +50 ˚C (- 4 °F to +122 °F)
11.5–23 V, 120 A (350 A temporarily for 10 seconds)
120 A (350 A temporarily for 10 seconds)
Battery types
12 V:; WET; MF; Ca/Ca; AGM; EFB; GEL
Degree of protection
Dimensions (L x W x H)
192 x 110 x 65 mm
2 years
Warranty, info

Please click HERE for wiring guide

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CTEK Smartpass 120S Power Manager

  • Brands CTEK
  • Product Code: SMARTPASS120S
  • Availability: 7
  • £259.99

  • Ex Tax: £216.66