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01223 858414

CTEK D250SE 20A 12V DC-DC MPPT Battery Smart Charger





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The answer to charging batteries with Smart Alternators in Motorhomes and Caravans!

This Swedish-manufactured 20A 12V MPPT DC-DC Battery Smart Charger has the ability to take up to 300W of solar power, and charge both the main engine battery and leisure battery. It is a fully automatic, 5 step charger that supplies up to 20A of power to charge, condition and maintain any 12V lead acid service battery from 40-300Ah.

  • 5 step charging from smart and conventional alternators and DC sources, such as solar and wind
  • Automatic battery separator works without the need for diodes or VSR relays
  • Selectable AGM mode for AGM batteries
  • Parallel input from both alternator and solar panel
  • Solar panel regulator with Maximum Power Point Tracking (MPPT)
  • Starter battery maintenance charging when your service battery is fully charged
  • Applications include utility vehicles, vans, motorhomes, caravans and boats


  • Input PV: 11.5-23V
  • Max Output Voltage 14.4V (14.7V in AGM mode)
  • Max charging current: 20A
  • MPPT: Yes
  • Operating Temperature: -20°C to +50°C 
  • Lead-Acid and Lithium Battery Types
  • Dimensions Lx192mm Wx110mm Hx65mm
  • Weight 1 kg
  • Insulation class IP65 (splash and dust proof)
  • 50-300W (max. solar panel open-circuit voltage 23V DC) 

Comes with a 2 year warranty.

There is also an option for a SMARTPASS 120 - a 120A DC-DC power management solution to go in-conjunction with the CTEK DS250SE that boosts the charging amps to 140A and separates critical equipment from non-critical equipment ensuring that all emergency and navigation systems always have power. This fully automatic solution eliminates the requirement for a VSR or diodes and maximises your battery life. It also protects your battery from loads that are attached to it and cuts off at 11.5V.