CTEK D250SE Battery Charger

The CTEK D250SE is a versatile 12V dual-input charger and maintainer, designed to supply up to 20A of power to lead-acid or lithium (LiFePO4, Li-Fe, Li-iron, LFP) service batteries from 40–300Ah. Fully automatic and temperature compensated, it features selectable charging algorithms for AGM and lithium batteries, smart alternator compatibility, and dual input from alternator and solar panels. When the service battery is fully charged, the D250SE automatically redirects maintenance charge power to the starter battery. With its robust design and integrated temperature sensor, it ensures stable, optimised charging in all weather conditions and is perfect for professional or mobile applications.

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Features

• Fully automatic 5-step charging with temperature compensation.
• Charges 12V lead-acid and lithium* batteries from 40–300Ah.
• Dual input capability: alternator and solar panel (MPPT) in parallel.
• Smart alternator compatible for vehicles with ECU-controlled alternators.
• Selectable lithium* and lead-acid charging modes.
• AGM selectable voltage: 14.4V or 14.7V.
• Maximised charging for improved battery life and performance.
• Automatic redirection of maintenance charge to starter battery when service battery is full.
• Integrated temperature sensor for optimised hot or cold weather charging.
• Replaces diodes and VSR relays with battery separation feature.
• Compatible with SMARTPASS 120 and SMARTPASS 120S for advanced 140A power management.
• Splash and dust proof (IP65).
• Backed by a 2-year warranty.

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## Specifications##

Specifications

Disclaimer: Specifications and features may be updated without notice to improve performance and reliability. Warranty applies only to manufacturing defects and material faults for the original purchaser. Misuse, mishandling, or unauthorised repairs will void the warranty. CTEK is not liable for damages beyond the stated warranty terms.

## Specifications##