CTEK Smartpass 120S 120A Power Management System for 12V Starter Service Battery


Smartpass 120S charges and supplies the service battery and equipment with 120A, separates critical equipment from non-critical equipment ensuring that radio, emergency lights and navigation systems always have power.

Smartpass 120S is a 120A Power Management Solution which distributes, controls and maximises the available energy from your alternator to power service batteries and consumers. SMARTPASS 120S handles all 12V batteries between 28-800Ah

The Smartpass 120S’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 120S is compatible with the D250SA and D250SE 20A on board chargers.


  • Brand: CTEK
  • Model: Smartpass 120S
  • Input: 11.5–23V, 120A max (350A temporarily for 10 seconds)
  • Output: Max. 14.4V, 120A (350A temporarily for 10 seconds)
  • Back Current Drain: Corresponding to less than 7Ah/month
  • Ambient Temperature: -20ËšC to +50ËšC (- 4°F to +122°F)
  • Battery Types: All types of lead-acid batteries, 12V, WET, MF, Ca/Ca, AGM, EFB, GEL, LiFePOâ‚„   
  • Battery Capacity: 28-800Ah
  • Warranty: 2 years
  • Insulation Class: IP65


  • 1 x CTEK Smartpass 120S


  • Carton Weight: 0.9kg
  • Product Dimensions (W x ? x H): 11 x 19 x 6.5cm
  • Product Weight: 0.7kg

SKU: CTEK-40-289

We accept Change of Mind returns for 14 days after you have received the item in cases where you have changed your mind or made an incorrect purchase and wish to return the product. This also applies to orders cancelled when the item has already been dispatched from our warehouse. The item must be in a re-saleable condition to qualify for a change of mind refund. Deductions may apply including Initial and Return Shipping, as well as restocking fee of 10% of the product price