CTEK 250TS Manual Download Page 3

EN

EN • 5

FUNCTIONALITY 

The D250TS has three operating modes:
1. 4-step charging of a Starter battery.
2. When Starter battery is fully charged: Equalization of a Service battery on the Input side. This 

function provides the possibility to connect 12 V consumers to the 1st battery in the Service 
battery string.

3. Monitoring. The D250TS now monitors if the Starter battery needs charging (priority) or the 

Service battery needs equalization.

B-1

B-2

B-3

IN

GNC

A

OUT

c2

c1

DC/DC

24 V/1CA

ALTERNATOR

STARTER MOTOR

SERVICE

BATTERY

SERVICE

BATTERY

STARTER
BATTERY

STARTER
BATTERY

20015884C D250TS, Manual, Print file 002.indd   5

2011-12-20   13:27:13

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