Loading Updating cart...


SMARTPASS is a smart automatic dual battery isolator switch and energy management unit which controls and optimizes energy produced by alternators, solar cells, wind power or conventional AC/DC chargers. It distributes power to battery banks or consumers depending on energy needs, such as the service battery bank, bow thruster or anchor chain hoist batteries or power consumers like refrigerators, radio’s, etc.
Used together with a D250S DUAL DC/DC on-board Battery Charger, SMARTPASS provides optimal charging via CTEK’s unique multi stage charging cycle, which also protects your batteries. SMARTPASS also has an integrated “Battery Watch” feature which protects batteries from harmful total discharge and ensures that critical equipment such as radio, emergency lights and navigation systems get the proper priority to provide maximum functionality. SMARTPASS has a temperature sensor which protects batteries against high temperatures.

• Works as a standalone unit or together with D250S Dual DC/DC Charger.
• Handles inputs of up to 80 A and battery capacity of 75 – 800 Ah.
• Automatic starter/service battery separation
• Battery Watch feature provides battery and critical consumer protection.
• Battery Temperature sensor.
• High vibration resistant design


  • Battery separation eliminates diodes and VSR relays
  • Charging of service batteries up to 100A, which reduces recharge time
  • Separation of energy-consuming equipment and service batteries during charging increasing the expected life of 12V devices such as light bulbs, LEDs and other electronics and allows the battery to be charged from the alternator at a level that minimizes recharge time [patent pending]
  • Temperature protection of services batteries reduces charge current at high temperatures [patent pending]


  • Maximized battery life as a result of reduced incidences where the battery is undercharged
  • Reduced charging times and costs by decreasing engine idling
  • Reduced dependency on AC power onshore through efficient use of alternator and solar power
  • Reduced environmental impact through extended battery life and a reduced idle time
  • Minimal installation time and cost

Suitable For

  • Boats
  • Campervans and RVs
  • Caravans
  • 4WDs
  • Heavy vehicles

Compatible With

CTEK D250S Dual

Integrated System

CTEK D250S Dual and CTEK SmartPass
Combining the CTEK D250S Dual and CTEK SmartPass ensures optimal battery charging.
The CTEK SmartPass manages the energy transfer through the CTEK D250S Dual, which then converts and produces the optimal voltage of 14.4V, even if the alternator only produces 14V.

Battery Watch Technology

CTEK’s built-in Battery Watch technology allows the SmartPass to make full use of the majority of energy produced (up to 95 %) and distributes the power servicing battery banks, bow thrust batteries and electrical equipment such as navigational systems. The CTEK SmartPass, properly manages and distributes power, directing energy to where it is needed most. This ensures that service batteries are protected from being deeply discharged, providing batteries with an optimal service life and reducing the frequency and need for regular traditional charging.

Protection From High Temperatures

The CTEK SmartPass has a sensor which senses the battery temperature and reduces charge current at high battery temperatures.

Simplified Installation

The CTEK SmartPass eliminates the need for units with multiple outputs. All batteries can be charged and maintained through the unit. The CTEK SmartPass converts a 110/230V charger with one output into a unit that serves both the service and starter battery.

Technical Data

Spec Data
Charging current capability Max 80 A
Battery type 12 V lead-acid batteries
Battery capacity 28–800 Ah
Insulation IP65 (splash and dust proof)
Article Number 56-676
Warranty 2 Year Limited Warranty
Certifications Meets ignition protection test requirements of the US Coast Guard stated in Title CFR 183.410

Guaranteed Quality With CTEK

CTEK offers a 2 year guarantee on all DC/DC chargers. CTEK customer support is an appreciated service, both with regard to general questions or specific issues related to charging and CTEK chargers. Safety, simplicity and flexibility characterizes all products and solutions developed and sold by CTEK. CTEK supply chargers to more than 60 countries throughout the world. CTEK is also a reliable OEM supplier to many of the world’s most prestigious car and motorcycle manufacturers. Contact customer support.

shopatron_availability: Y

Comments are closed.