What is CTEK SMARTPASS 120S?

TEK CSmartpass 120S is a 120A Power Management Solution which distributes, controls and maximises the available energy from your alternator to power service batteries and consumers. CTEK SMARTPASS 120S handles all 12V batteries between 28-800Ah. The CTEK Smartpass 120Ss 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. CTEK SMARTPASS 120S is compatible with the D250SA and D250SE 20A on board chargers.

Features of CTEK SMARTPASS 120S

• Battery separation eliminates diodes and VSR relays
• 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

Combine with CTEK D250SA CAPABILITIES

The D250SA is CTEK’S latest 20 AMP DC to DC charging unit. It has a built-in solar MPPT (Maximum Power Point Tracker) regulator. It also has a battery rejuvenation cycle if the charger detects high sulphate concentration on the lead plates in the battery. This is the first step in a five-step charging process. The D250SA is smart alternator compatible and will charge your auxiliary batteries from either the alternator or solar panels or a combination of both if needed.

It will change the charge rate depending on battery temperature. It will also trickle charge the starter battery from solar panels if needed. You can also wire it up for an AGM (Absorbent Glass Mat) battery. It will comfortably look after a battery bank up to 300 amp/hours.

CTEK SMARTPASS 120s CAPABILITIES

The CTEK Smartpass 120s is an alternator charging system. It hooks the starter and auxiliary batteries together so the alternator charges both batteries. It has a 12-volt output for appliances that cut out at 11.5 volts, for non-critical consumers. This prevents your auxiliary battery from deep discharge.

The CTEK Smartpass 120s automatically connects the starter battery to the auxiliary battery for start assistance if the starter battery is low. It will also trickle charge the starter battery from the auxiliary battery. It will handle up to an 800 amp/hour battery bank.

COMBINING THE TWO

When the CTEK D250SA and Smartpass120 units are linked together you have a great charging system. You get all the features of each stand-alone unit. Together, the combination turns into a 140 AMP charging system. It will trickle charge the starter battery from a solar panel, auxiliary battery or a combination of both.  A minimum of a 100 amp/hour battery bank is required but the system can handle up to an 800 amp/hour. It has full battery temperature monitoring for charge rate.

The Smartpass120 is capable of a 350 AMP, 10-second burst back to the starter battery. To fully utilise this function you need a minimum cable size of 0B&S (275AMP) between the starter battery and the Smartpass120 and between the Smartpass120 and the auxiliary batteries.

SUMMARY

We now have both the D250SE and the CTEK Smartpass120S fitted into our BT50. They are maintaining a 220 amp/hour battery bank. We are still giving the batteries the same work as before the CTEK system was installed but now we have a system that:-

• Has its own solar MPPT regulator.
• 22+ volts straight from the solar panel (no regulator) to the D250SA minimising current loss.
• Will monitor battery state of charge from starter battery to auxiliary battery
• Will charge auxiliary batteries in a much-reduced period of time.
• Start assistance.
• Temperature-controlled charging.
• Up-rated AGM charge rate.

We are so impressed with this combination already. It is perfect for charging our RPA batteries, as well as phones, laptops and cameras. We would highly recommend this system for anybody who has serious power requirements when travelling.

Why use CTEK Smartpass?

CTEK Smartpass is a power management system that works with the CTEK D250S Dual charger to distribute, control and maximise the available energy from your alternator, solar panels or other sources to power your service batteries and consumers¹. It can handle up to 80A for batteries of between 28-800Ah.

It has a Battery Guard function that 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 low¹².

It also has a dynamic over current protection to handle temporary inputs and outputs of up to 350A for fast charging².

It is splash and dust proof (IP65) and has a 2-year warranty.

You can use CTEK Smartpass if you want to optimize the performance of your 12V DC source and protect your batteries from overcharging or total discharge.

Why use a CTEK D250SE and an CTEK Smartpass 120 together?

You can use a CTEK D250SE and a CTEK Smartpass 120 together to create a **140A power management solution** that can charge and supply your service battery and equipment with power from your alternator, solar panel or other sources¹².

The D250SE is a **dual input 20A charger** that can charge any 12V lead-acid or lithium service battery from 40-300Ah. It has selectable charge algorithms for AGM and lithium batteries and can maintain a stable output up to 20A to vehicles fitted with smart ECU controlled alternators².

The Smartpass 120S is a **120A power management system** that distributes, controls and maximises the available energy from the D250SE to power service batteries and consumers. It has a Battery Guard function that protects your service battery from total discharge and a dynamic over current protection to handle temporary inputs and outputs of up to 350A for fast charging¹.

It also has a **start assistance function** that automatically connects the service and starter battery if the starter battery on its own is unable to start the engine³. By using the D250SE and the Smartpass 120 together, you can enjoy your vehicle more with maximized battery capacity and performance.