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)
Insulation class IP65 (splash and dust proof)
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SMARTPASS 120 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 D250S DUAL 20A on board charger for the ultimate 140A power management system.


  • Automatic battery separator works without the need for diodes or VSR relays
  • Battery Guard makes sure that critical functions always have power and protects your service battery from total
  • Start Assistance uses power from your service battery to help get your engine started if your starter battery is flat
  • Dynamic Over Current Protection to handle outputs of up to 350A for up to 10 seconds
  • Battery temperature protection switches off charging if your service battery temperature is too high
  • Current Source priority supplies power to critical equipment directly from the alternator when the engine is running
  • Starter battery maintenance charging when your service battery is fully charged


Download PDF Datasheet