F) Multiple Unit Parallel Wiring - NewMar PT-24-45W Bb8Db2Cc8C9B8A4Bb2Bbe763F

4) Cut away the outer jacket of the new three-wire A.C. input
cable, 14 AWG, so that individual wire leads are about 2" long.
Strip about 1/4" of insulation off the ends of each wire and feed the
cord through the input cable strain relief.
5) Insert each A.C. input wire into the appropriate HOT, NEUTRAL or
EARTH GROUND terminal and tighten securely. With some models,
working space in the A.C. compartment is very limited, so use of
needle-nose pliers may be necessary to manipulate the wires into
place in the terminal strip.
6) Tighten the compression nut on the input cable strain relief.
Replace the white charger front cover.
Note: If installing the Temperature Probe option, do at this time
– see section III-H.
In marine applications) All charger wiring should be installed in
accordance with UL, U.S. Coast Guard and/or A.B.Y.C. regulations
and recommendations, as well as all relevant local codes. See
section XI REFERENCE APPENDIX for sources.
A note about the A.C. input fuse: The A.C. input of your charger is
protected by an input fuse which is located inside the unit. Due to
the current limiting characteristic of the charger, it is highly unlikely
that this fuse will blow unless there is some other malfunction
within the charger. This fuse is not user-replaceable. Replacement
of the input fuse must be performed by a qualified service person.
(See TROUBLESHOOTING section for further information.)
8
P.O. Box 1306, Newport Beach, California 92663 • Phone: 714-751-0488 • Fax: 714-957-1621 • E-Mail: techservice@newmarpower.com
FIGURE 4: Parallel Wiring for Large Capacity Battery Systems
PT-24-45W
-
+ + +
+ -
Bank 1

F) Multiple Unit Parallel Wiring

Multiple Phase Three chargers may be wired in parallel, if
necessary. They are diode protected against feedback from other
units and current limiting will prevent overloading.
There are two main reasons why you may wish to wire multiple
units in parallel:
1) To meet the current requirements of very large capacity battery
systems and/or large D.C. loads which exceed a single charger's
rating, two or more units may be used. For instance, if you require
115 amps for a 24 volt system and wish to maintain batteries at full
(float) voltage while supplying this load, you may wire a PT-24-
95W in parallel with a PT-24-45W:
PT-24-45W: Max amps at float voltage* = 38 amps
PT-24-95W: Max amps at float voltage* = 80 amps
Total maximum load with no loss of battery voltage = 118 amps
* Refer to the SPECIFICATIONS section for maximum current output
at full (float) voltage for each individual model.
Note: If the temperature compensation option is used with multiple
parallel units, a separate sensor must be provided for each
charger. (See section III-H Temperature Compensation.) FIGURE 4
below illustrates a typical wiring scheme of this sort:
+ -
Bank 2
To 118 Amp Total Load(s)
www.newmarpower.com
PT-24-95W
Note: This diagram
does not illustrate
a complete system.
Refer to ABYC
standards E-11)
AC & DC electrical
system on boats
-
+ + +
+ -
Bank 3