10 • US
If the battery is charged and/or the battery’s terminal voltage drops, the charger starts a
charge pulse until the voltage has reached the preset level, 14.4V. The charge pulse is
then interrupted and the cycle is repeated as long as the charger is in pulse maintenance
phase. If the terminal voltage drops even lower, the charger automatically reverts to the
beginning of the charging curve. Pulse maintenance phase is indicated by lamp 4. If pos-
sible, check the water level in the battery.
Chosen mode: ”SUPPLY”
MULTI US 25000 has a Supply mode which gives a constant voltage of 13.6V and cur-
rent up to 25A. This mode can also be used for maintenance charging of an already fully
charged battery (Float maintenance). This keeps the battery at 100% charge. The con-
stant small overcharge can cause water loss. A battery does not have to be connected for
the charger to deliver voltage. The spark protection is not active in Supply mode. It is not
recomended to charge a completely discharged battery in Supply mode, since this will not
result in a completely charged battery. In this mode, MULTI US 25000 can also be used
as a power generation unit for operating equipment that requires 13.6V and a maximum of
25A. If the selected current exceeds 25A, the output voltage will drop as the load increas-
es. The charger has electronic overload protection in this mode, which is activated if the
charge is so great that the output voltage from the charger falls below around 9V and the
current is around 25A. In the event of an overload, the charger goes into error mode
(lamp 0). Supply mode is indicated with lamp D and lamp 5.
Chosen mode: ”RECOND”
MULTI US 25000 has a Recond mode which is used to recondition a battery that has
been severely discharged. The battery is first charged using the mode ” NORMAL”. When
the analysis phase is complete, the charger begins reconditioning the battery by providing
a constant current of 3A and a maximum voltage of 15.7V. After 0.5–4 hours, the battery
is completely reconditioned and the charger goes into pulse maintenance. The battery is
ready to be used, or store it with pulse maintenance active until you are ready to use the
battery. Recond is indicated by lamp E and lamp 6. Note that the Recond step begins with
normal charging and that the charger therefore will indicate the charging steps according
to the descriptions above first. Lamp 6 is first lit when the reconditioning begins.
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