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D250SE and SMARTPASS 120: A Great Team

smart pass 120

CTEK Smartchargers aren't just for cars and trucks, we also have chargers for vehicles that run on DC. The D250SE and Smartpass 120 allows for DC/DC onboard charging, providing you with power and reliability for your off-grid needs.

Many vehicle owners find it a challenge to keep their batteries charged throughout the day. Inefficient battery systems can lead to battery levels dropping below 65%, leading to poor performance and some anxiety when you're off the grid.

Although some vehicles are outfitted with generators, the operators like to keep those for emergency situations (in addition to generators being loud and smelly, ruining the peacefulness of being away from the city). Having to constantly worry if your batteries are going to be able to do their job cuts into the enjoyment of using your vehicle.


Fortunately, CTEK has a solution for your battery charging needs. The D250SE is a fully automatic, 5-step DC/DC charger that supplies up to 20A of power that will charge, condition, and maintain your 12v lead acid service batteries, whether you use an alternator or a solar charger.

The D250SE offers a special AGM function for AGM batteries. These batteries need to be charged at a higher voltage of 14.7V. There is an advanced inbuilt Maximum Power Point Tracker (MPPT) that maximizes the power from the solar panels. This will save you time and money as you won't need a separate solar regulator.

When using the D250SE, the risk of your battery overcharging or overheating is virtually nonexistent. The built-in temperature sensor compensates for both hot and cold conditions.


Pair the D250SE with the SMARTPASS 120, a fully automatic 120A onboard power management system, for the ultimate combination of power and charging ability. This system can deliver up to 140A of charging power to an 800Ah battery bank. (The D25SE and SMARTPASS 120 are available together in a 140A Off Road Bundle that also includes a CTEK Battery System Monitor)

The D250SE will charge the battery close to its full capacity, then slow the voltage to maintain the battery at full or near charge, allowing the battery to last longer and perform at its best. The SMARTPASS 120 can boost your solar charging system, also making the process more efficient.

The entire Onboard Charging System can be mounted just about anywhere, making it convenient to access and operate. The temperature sensor will maintain the correct settings, compensating for hot or cold environments, keeping your vehicle safe during charging.

Use our Charger Selection Tool to find out which CTEK charger is right for your vehicle.