Description
CTEK D250SE – Dual-Input 12V Charger & Battery Maintainer
The CTEK D250SE is a dual-input 12V charger designed for vehicles without access to mains power, providing smart, high-performance charging for both lead-acid and lithium batteries. Leveraging award-winning Swedish technology, the D250SE maximizes battery capacity and life, allowing you to enjoy your vehicle with confidence even in off-grid conditions.
This fully automatic 5-step charger delivers up to 20A of power to service batteries ranging from 40–300Ah. With selectable charge algorithms for AGM and lithium (LiFePO₄, Li-Fe, Li-iron, LFP) batteries, the D250SE intelligently adjusts charging to suit your battery type. Its dual-input capability enables efficient charging from alternators, solar panels, or wind power. Once the service battery is fully charged, the D250SE automatically redirects maintenance charge to the starter battery, ensuring both batteries remain in optimal condition.
The D250SE is ideal for vehicles fitted with smart ECU-controlled alternators, maintaining a stable output of up to 20A. With a built-in temperature sensor, the charger compensates for extreme hot or cold conditions, optimizing battery performance regardless of the environment. Its rugged, IP65-rated splash- and dust-proof housing ensures reliability in tough outdoor and mobile applications.
Key Features
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Dual-Input Charging: Accepts power from alternator, solar panel, or wind sources.
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Selectable AGM Mode: Choose 14.4V or 14.7V for AGM batteries.
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Optimized Battery Life: Maximizes performance and longevity of lead-acid and lithium batteries.
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Temperature Compensation: Adjusts charge for hot or cold weather conditions.
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Battery Separation: Replaces diodes and VSR relays for efficient power management.
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MPPT Compatible: Works with SMARTPASS 120 / SMARTPASS 120S for 140A system management.
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Safe & Reliable: Spark-free, reverse-polarity protected, and low ripple output (<4%).
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Rugged Design: IP65 splash- and dust-proof housing for harsh environments.
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Fully Automatic: Simple “connect and forget” operation.
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2-Year Warranty: Backed by CTEK quality and reliability.
Technical Specifications
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Charging Category: DC Charging
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Input: 11.5–23 V, 25 A
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Output: 14.4/14.7 V, 20A (lead-acid); 14.2 V, 20A (LiFePO₄)
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Battery Chemistry: Lead-Acid; Lithium-Ion (LiFePO₄, Li-Fe, Li-iron)
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Battery Types: 12V – WET, MF, Ca/Ca, AGM, EFB, GEL, LiFePO₄
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Battery Capacity: 40–300 Ah
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Back Current Drain: <1 Ah/month
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Ambient Operating Temperature: –4°F to +122°F (–20°C to +50°C)
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Ripple: <4%
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Degree of Protection: IP65
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MPPT: Yes
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Warranty: 2 years
Ideal For
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Vehicles without access to mains power (off-grid, RVs, boats, campers)
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Smart alternator-equipped vehicles
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Lithium and lead-acid dual-battery systems
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Long-term battery maintenance and optimization
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Off-grid travel and mobile applications
The CTEK D250SE is the ultimate dual-input charger and maintainer, combining smart charging technology, safety, and rugged durability to ensure maximum battery life and performance for off-grid vehicles.
