Overheating Protection; Battery Cables; Temperature Compensation; Maintenance - CTEK MULTI US 25000 User Manual

Battery charger for lead-acid batteries 50–500ah
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Recommended Minimum AWG Size for AC Extension cords
Length of cord feet (m)
25 (7.6)
50 (15.2)
100 (30.5)
150 (45.6)

OVERHEATING PROTECTION

The MULTI US 25000 is equipped with overheating protection. In high ambient tempera-
tures the output power is reduced. Do not cover the charger. 

BATTERY CABLES

MULTI US 25000 is equipped with a set of battery cables with battery terminal clips. Do 
not shorten the battery cables.

TEMPERATURE COMPENSATION

MULTI US 25000 has a sensor cable placed together with the battery cables. The unit will 
automatically adjust the charging voltage if the temperature deviates from +77°F. A high 
temperature lowers the voltage and freezing conditions is handled by higher voltage.
The temperature is best measured on or very close to the battery. Therefore always place 
the sensor as close to the battery as possible when charging. The sensor cable could be 
prolonged or cut to length with the same functionality. A short-circuited or disconnected 
sensor is indicated by lamp A. The charging voltage will then be 14.4V.

MAINTENANCE

The MULTI US 25000 is maintenance-free. The charger must not be opened; doing so 
will invalidate the warranty. If the power cable is damaged it must be replaced by CTEK or 
its authorized representative. The charger casing can be cleaned using a damp cloth and 
mild cleaning agent. Remove the plug from the power socket before cleaning.
AWG Size of cord
18
16
12
10
US  •  13

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