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2) Two or more chargers may also be required to provide parallel/
redundant "N + 1" power system reliability. Certain critical D.C.
systems, such as those which power emergency communications
equipment, must remain fully powered, even in the event of a
failure of one of the battery chargers. To provide this extra measure
of reliability, one more charger is wired into the system than is
required for normal operation.
For instance, if 45 amps are required for a 32 volt system and you
wish to maintain batteries at full (float) voltage, two PT-32-25W's
wired in parallel would normally be sufficient:
PT-32-25W: Max amps at float voltage = 23 amps x 2 = 46 amps
Total maximum load with no loss of battery voltage = 46 amps
However, if "N + 1" redundancy is required, a third PT-32-25W may
wired in parallel with the other two chargers, as well. Using this
type of system, if one unit were to fail, the remaining two would
continue to power the entire load until the failed unit could be
replaced or repaired.
Note: When wiring chargers together in parallel, the wire gauge for
each charger remains the same as if it were wired into a system by
itself.
Note: Under certain line and load conditions, it's normal for
paralleled chargers to output different amounts of current. It is
also normal when AC power is connected or interrupted to see the
chargers in different charge modes (Float, Absorption, or Bulk.)
+
P.O. Box 1306, Newport Beach, California 92663 • Phone: 714-751-0488 • Fax: 714-957-1621 • E-Mail: techservice@newmarpower.com
FIGURE 5: Typical Parallel/Redundant "N + 1" Wiring
PT-32-25W
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+
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Bank 1
G) Gel-Cell/Lead Acid Selector
Checking or Setting the Selector
The ideal charge/float regimen has been programmed into the
Phase Three Charger for either sealed gel-cell or flooded lead-acid
batteries depending on the selector position. The selector has been
factory set in the lead-acid position. In order to check or change the
gel/lead-acid selector setting, proceed as follows:
1) Ensure A.C. power to the charger is shut off.
2) Locate the slide switch which is recessed into the bottom of
charger – see Quick Reference Drawing – pg.2. (Note: There may
be a black rubber cover over this switch.)
3) Use a flat blade screwdriver or pen to slide the switch into the
correct position. Replace the rubber cover over the switch.
Gel/Lead-Acid Selector Function
According to battery manufacturers, the ideal charge regimen for
gel-cell and wet or flooded lead acid batteries differs somewhat.
The gelled electrolyte in a sealed battery may be lost or damaged
by high voltage and, once lost, cannot be replaced as it can
with a wet lead acid battery. Manufacturers of gel-cells usually
recommend an ideal charge voltage which is slightly lower for a
gel-cell than a lead acid battery.
PT-32-25W
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+
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+
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Bank 2
To 32 Volt Loads
www.newmarpower.com
Note: This
diagram does
not illustrate
PT-32-25W
a complete
system. Refer to
ABYC standards
E-11) AC & DC
electrical system
on boats
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+
+ +
+
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Bank 3
9
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