CTEK 20A Dual Input DC-DC Battery Charger – D250S Dual

The D250S DUAL charger obtains its energy from DC sources such as alternators, solar panels or wind power and optimises this power to meet the charging requirements of different battery banks. The D250S DUAL automatically selects the best connected DC energy source (of 2) for the purpose and switches between these energy sources to achieve high efficiency multi-stage charging. The D250S DUAL is particularly suitable for charging caravans, motor caravans, boats and second homes that do not have access to grid power supplies. Charging automatically starts as soon as DC energy is provided to the charger, such as from alternators when a vehicle is started or from solar panels when connected. The D250S DUAL has a temperature sensor which ensures optimal charging voltages at all temperatures. The D250S DUAL ensures that your batteries are always in good condition, quick charging and long battery lifetimes.

The D250S DUAL is a fully automatic 5-stage charger that supplies 20A to 12V batteries of 40-300Ah. The charger is IP65 classified (water jet and dust protected and approved for outdoor use), protects vehicle electronics and is suitable for all types of lead-acid batteries (Wet, MF, Gel, AGM). It is supplied with a 2 year guarantee.

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SKU: D250S Categories: ,

Discontinued - replacement product:

CTEK 20A Dual Input DC-DC Battery Charger – D250SA


  • • Voltage: 12 Volt
    • Charging voltage: 14.4V at 25°C, temperature compensated
    • Charging current: 20A
    • Back current drain: <1Ah/month
    • Ripple: <4%
    • Ambient temperature: -20°C to +50°C
    • Charger type: 5-step fully automatic charging
    • Battery types: 12V lead-acid batteries (WET, MF, Ca/Ca, AGM and GEL)
    • Battery capacity: 40–300Ah
    • Dimensions: 192 x 110 x 65mm (L x W x H)
    • Insulation class: IP65
    • Weight: 0.73kg

Additional information

Operating Temperature

Charging Inputs

In-built Solar Regulator

Battery Bank Size

Charge Sequence

Supply Voltage

Output System Voltage

Output Current

Standby Current Draw

Open Circuit Voltage (Voc)

Compatible - Alternators

Compatible - Battery Type

Mounting Location

Weather Protection
Weather & Conditions Rating

Colour - Standard

Dimensions & Weight
Dimensions - External


Warranty Duration