CTEK D250S Dual User Manual

10 • EN
SMARTPASS
SMARTPASS can operate as a stand-alone unit, but works best
in combination with D250S Dual. The SMARTPASS creates
a priority path for charging the Service battery to recharge
it more quickly and efficiently. Attached energy sources like
solar, wind or shore power will charge both the Service and
the Starter batteries through the SMARTPASS. Service batteries
that are overheated due to age, high ambient temperature or
other battery problems will be protected from high alternator
current.
SMARTPASS
FEATURES:
The CTEK SMARTPASS adds additional functionality for higher
output alternators, larger battery banks and/or high parallel
loads.
• Separation of consumers and Service batteries during
charging, which improves the charging capacity signifi-
cantly, and lowers the consumer voltage, which increases
expected service life of lights and other electronics.
• Service battery watch, which avoids harmful deep dis-
charges that otherwise would shorten battery life. The bat-
tery watch also protects navigation, radio and emergency
light from being out of electricity.
• Over-temperature protection of Service battery. High bat-
tery temperature could significantly reduce battery life.
• Maintenance charge of Starter battery, which simplifies
installation with fewer components.
• Simplified installation of AC/DC chargers (shore power).
Only one output from the AC/DC charger needed.
The CTEK SMARTPASS is designed to work together with
1-2 CTEK D250S DUAL, but can also be used alone.
+IN +OUT
+OUT
SMARTPASS12V
Temperature sensor
L: 2m/6.5 feet
Negative cable
connection M8
L: 0.3m/12 inches
Consumers +
Alternator
battery +
Service
battery +

CTEK D250S Dual Specifications

General

Charging Current	20 A
Operating Temperature	-20°C to +50°C
Protection Class	IP65
Battery Capacity	40–300 Ah
Battery Types	Lead-acid (Wet, MF, AGM, GEL)
Protection Features	Reverse polarity protection, over temperature protection
Input Voltage	11.5-23V, DC
Charging Stages	5-stage, Automatic