CTEK Smartpass 120

CTEK Smartpass 120

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SMARTPASS 120 (Part #40-185)  is a fully automatic 120A power management system that prioritizes, controls and maximizes energy from your alternator to power your service battery. It safely separates your starter and service batteries automatically. It also distributes power between the starter battery, the service battery and on board equipment without the need for traditional diodes or VSR relays. This means that SMARTPASS 120 can make sure that critical functions like starters, radios, emergency lights and communication systems always have the power they need, and take priority over noncritical functions. SMARTPASS 120 works with any 12V lead acid battery. It can also be used with the CTEK D250SA 20A on board charger for the ultimate 140A power management system.


  • Fast charging – even on short journeys – using 120A current
    from the alternator
  • Starts the engine from the service battery when your starter
    battery is flat
  • Prioritizes critical functions so they’re always powered up
    and working when you need them
  • Automatic energy management in a single, easy to use unit –
    no need for traditional diodes or VSR relays
  • High temperature protection for added safety


Input 11.5–23V, Max 120A (350A temporarily for 10 seconds)
Output Max. 14.4V, 120A (350A temporarily for 10 seconds)
Back current drain Less than 7Ah/month
Ambient temperature -20°C to +50°C (-4°F to +122°F)
Battery types All types of 12V lead-acid batteries (WET, EFB, Ca/Ca, MF, AGM and GEL)
Battery capacity 28–800Ah
Dimensions 192 x 110 x 65mm (L x W x H)
shopatron_availability: Y

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