CTEK D250SE DC to DC Charger 12 Volt

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CTEK D250SE DC to DC Charger 12 Volt

What to Expect

Faster Charging

The CTEK D250SE DC to DC Charger is a fully automatic 5 step charger capable of maintaining a stable output up to 20A to your auxiliary battery bank. It has selectable charge voltages for AGM and Lithium batteries and can us power through its dual input from an alternator, solar panel, and wind power.

Solar & Wind Connection

A whole lot more than just your average 12v car battery charger, the CTEK D250SE DC to DC Charger has an auxiliary input which can be connected directly to solar panels. The charger’s built-in Maximum Power Point Tracker (MPPT) helps the solar cells produce power as efficiently as possible by taking the most efficient source of energy from the solar panels automatically, and then using the power to charge the battery. The MPPT searches for the most effective combination of solar cell voltage and current, which ensures that the solar and alternator functions are in unison to maximize power output.

CTEK D250SE Dual Charger Features

  • 20A fully automatic temperature compensated charging for batteries from 40-300Ah
  • Dual input (solar and alternator in parallel)
  • Smart alternator compatible
  • Battery separation replacing diodes and VSR relays
  • Solar panel regulator with Maximum Power Point Tracking (MPPT)
  • Selectable lithium and lead-acid mode
  • Splash and dustproof (IP65)
  • Compatible with SMARTPASS 120 for the ultimate 140A power management solution
  • 2-Year warranty

CTEK D250SE Charger Specifications

  • Input: 11.5-23V, 25A
  • Output: 14.4V, 20A Max
  • Back current drain: Corresponding to less than 1Ah/month
  • Ambient Temp: -20C to +50C
  • Battery Types: 12V: WET, EFB, Ca/Ca, MF, AGM, GEL, LiFePO4
  • Battery Capacity: 40-300Ah
  • Warranty: 2 Years
  • Insulation Class: IP65
  • Ripple**: Less than 4%


This CTEK model will work for the following brands unless a lithium battery has been installed:

  • Acura
  • Audi
  • BMW
  • Bentley
  • Buick
  • Cadillac
  • Chrysler
  • Dodge
  • Ford
  • GMC
  • Genesis
  • Honda
  • Hyundai
  • Infiniti
  • Jaguar
  • Jeep
  • Land Rover
  • Lexus
  • Lincoln
  • Maserati
  • Mazda
  • Mercedes-Benz
  • Nissan
  • Porsche
  • Ram
  • Rolls-Royce
  • Saab
  • Subaru
  • Toyota
  • Volkswagen
  • Volvo

 Contact Us

Do you have a question? You can contact us online or toll-free at 1-877-775-4381 to talk to a battery specialist today or visit our CTEK D250SA FAQ page.

The CTEK D250SE DC to DC Charger 12V utilizes a patented 5 step smart charging process to either maintain or bring your battery or battery bank back to life.

customer reviews

Total Reviews: 3

verifired buyer

  • Lawrence


    Biggest disappointment and a lot of wasted money. Charges then stops Disconnect everything and reconnect then charges for a few minute the nothing again. Connected with a 120s, same story works for a few minutes then zut!

  • Cary W.


    This is a excellent product that our customers really speak highly of.

  • Herve Mazoyer


    Great solution for charging service batteries from either the alternator or solar.