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Note that as depleted batteries are first encountered, the charger responds with high "bulk"
current output. This high current output continues until the finishing or "float battery
voltage is achieved (13.8 VDC for 12 volt models; 27.6 VDC for 24 volt model).
At this point, the battery would measure full charge if tested with a voltmeter, but it is only
what is called a "surface charge". For this reason the charger continues to deliver amperage
(as shown in the graph) but output begins to fall off as the battery plates become saturated.
When current output is at or near zero, batteries are at or near full voltage.
Note that once batteries are fully charged and intermittent DC loads are applied (as shown
in the graph) battery voltage remains constant. This is due to the charger's excellent output
regulation. The charger senses any DC load demand (while external AC voltage is applied)
and responds instantaneously with the required current output while maintaining constant
output voltage. This is unlike older technology chargers which respond with significant
current output only when DC load demands have caused a substantial drop in battery
voltage.
Therefore, once batteries are fully charged, any DC load on the system (within charger rat-
ing) will come directly from the charger—not the batteries—so there is no need to "top off"
batteries if there have been DC appliances or electronics in use and it becomes necessary to
disconnect the charger before getting under way.
While the output regulation of the charger will minimize battery gassing and water loss,
monthly checks of the electrolyte level (for wet lead acid batteries) are still strongly recom-
mended. Some water loss is an inevitable aspect of the charging process, and maintaining
the correct electrolyte level in your batteries is the most important thing you can do to as-
sure their maximum performance and long life.
B) Adjusting Charger Output Voltage (Optional)
The finishing or "float" output voltage of the internal battery charger has been factory pre-
set at 13.8 VDC (12 volt models) or 27.6 VDC (24 volt model). This voltage assures full
charge while staying just below the gassing point of most typical marine batteries.
If a special application requires it, the output voltage may be adjusted up or down some-
what. Use a small flat tip screwdriver to turn the potentiometer on the front panel which is
labeled "Charge Voltage Adjustment":
l Turn clockwise to raise the finishing voltage
l Turn counter-clockwise to lower the finishing voltage
The factory-set output voltage and approximate user-adjustment range are as follows:
Model
12-1200IC
12-1799IC
24-1300IC
U.S.A. HEADQUARTERS
P.O. Box 1306, Newport Beach, CA 92663
Phone: 714-751-0488 Fax: 714-957-1621
E-Mail: sales@newmarpower.com
Factory Set
Output Voltage
Adjustment Range
13.8 VDC
12.8 - 14.5 VDC
13.8 VDC
12.8 - 14.5 VDC
27.6 VDC
25.6 - 29.0 VDC
www.newmarpower.com
EURO WAREHOUSE
Phone:+31-35-603-2494 Fax:+31-35-603-2149
E-Mail: newmareuro@newmarpower.com
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