What is CTEK D250Se?

With award-winning Swedish technology, the dual input CTEK 250SA allows you to enjoy your vehicle more with maximized battery capacity as the ideal charger for vehicles without access to a mains power supply. Made for vehicles with Dual Battery Systems like caravans, ambulances, rescue vehicles, and service vehicles.

Why CTEK D250SE?

The D250SE is a fully automatic, 5-step charger that supplies up to 20A of power to any 12V lead-acid or ­lithium* service battery from 40–300Ah. It has ­selectable charge algorithms for AGM and lithium* batteries and can use power through its dual input from alternator and solar panel. When the service battery is fully charged, the D250SE will ­automatically redirect maintenance charge ­power to the starter battery. The D250SE can maintain a stable output up to 20A to vehicles fitted with smart ECU controlled ­alternators and also has a temperature sensor for ­optimised charging, regardless of weather conditions. *) 12V lithium batteries (LiFePO4, Li-Fe, Li-iron, LFP)

Features of CTEK D250SE

• 20A fully automatic temperature compensated charging for batteries from 40-300Ah while you’re on the move in a Dual Battery System vehicle with 2 12v batteries
• Dual input (solar and alternator in parallel)
• Smart alternator compatible
• Battery separation replacing diodes and VSR relays
• Solar panel regulator with Maximum Power Point Tracking (MPPT)
• Selectable AGM option – 14.4V or 14.7V
• Maximised charging for better battery life and performance
• Temperature sensor to compensate for hot or cold conditions
• Splash and dustproof (IP65)
• Compatible with SMARTPASS 120 for the ultimate 140A power management solution
• 2-year warranty

This product can be used in conjunction with CTEK Smartpass 120

The CTEK D250SE is a five-step, fully automatic charger that can revive flat batteries. It can supply up to 20A of power to any 12V service battery. The D250SE can also charge a service battery at up to 20A from the starter battery when a smart alternator is running.

Here are some steps for using the CTEK D250SE:

Desulfation: Removes sulfates from batteries that have been almost fully discharged.
High voltage and max amps: Quickly brings the battery charge up to 80%.
Absorption phase: Lowers the amps and gently tops up the remaining 20% of the battery to 100%.

Here are some tips for using the CTEK D250SE:

If you have a smart alternator, connect the red Smart Alternator signal cable to a +12V source that is live when the engine is running.
When using with solar panels, the panel open circuit voltage must not exceed 23V DC.
Do not use with panels connected in series.
If using multiple panels, connect in parallel and ensure the open circuit voltage is less than 23V DC.

Please refer to the Latest Safety instructions for proper installation of CTEK D250SE