The CTEK D250SE is a fully automatic 12V DC/DC battery charger designed for dual-battery systems in vehicles, RVs, boats, and off-grid setups. With a robust 20A charging capacity, it ensures your service battery remains charged using power from both the alternator and solar panels. Its advanced features, including selectable charging modes for lead-acid and lithium batteries, make it an ideal solution for maintaining optimal battery health in demanding environments.

Key Features

• ✅ Dual Input Charging: Accepts power from both the alternator and solar panels, ensuring continuous charging.

• ✅ 20A Fully Automatic Charging: Provides up to 20A of power to 12V lead-acid or lithium service batteries ranging from 40–300Ah.

• ✅ Selectable Charging Modes: Offers charging algorithms for AGM and lithium batteries, with options for 14.4V or 14.7V for AGM batteries and 14.2V for lithium batteries.

• ✅ Maximum Power Point Tracking (MPPT): Optimizes solar panel efficiency for faster charging.

• ✅ Temperature Compensation: Adjusts charging parameters based on ambient temperature, ensuring safe and efficient charging.

• ✅ Battery Separation: Replaces diodes and VSR relays for improved performance.

• ✅ Splash and Dust Proof (IP65): Suitable for outdoor and harsh environments.

• ✅ Compatibility with SMARTPASS 120/120S: For an ultimate 140A power management solution.

• ✅ 2-Year Warranty: Ensures long-term reliability and peace of mind.

Specifications

• Input Voltage: 11.5–23V, 25A

• Output Voltage: 14.4V/14.7V (lead-acid), 14.2V (LiFePO₄)

• Charging Current: Up to 20A

• Battery Types: WET, MF, Ca/Ca, AGM, EFB, GEL, LiFePO₄

• Battery Capacity: 40–300Ah

• Ambient Temperature Range: -20°C to +50°C (-4°F to +122°F)

• Enclosure Class: IP65 (splash and dust proof)

• Dimensions: 192 x 110 x 65 mm

• Weight: 0.7 kg

• Ripple: Less than 4%

• Back Current Drain: Less than 1Ah/month

• Warranty: 2 years

Applications

• Dual-battery systems in vehicles, RVs, and boats

• Off-grid solar setups

• Overlanding and expedition vehicles

• Marine and recreational vehicles

• Fleet maintenance and management

Why Choose the CTEK D250SE?

The CTEK D250SE stands out with its dual input charging capability, allowing for simultaneous charging from both the alternator and solar panels. Its 20A fully automatic charging ensures that your service battery remains charged, even in remote locations without access to mains power. The selectable charging modes cater to various battery types, while the MPPT technology optimizes solar charging efficiency. With its robust design and advanced features, the D250SE is a reliable choice for maintaining battery health in demanding environments.

Product Info Sheet