Model HPX-30 Parallel Charger
Supplemental Instructions
Read the Operation & Safety Instructions in the main manual.
Follow the battery manufacturers recommendations when selecting a battery for use with this unit. The
battery should be able to accept the full rated output current of this unit or the battery may be damaged if
the load is disconnected.
When using a load which is greater that the maximum continuous load specification, the battery may not
charge and may begin to discharge. The use of a low voltage cut off (LVCO) is recommended.
This unit is a Parallel Charger version of the model HPX-30 Battery Charger. It is designed to simultaneously float charge a
battery while supporting or supplementing a parallel load
Refer to the instructions in the main manual for connecting the battery. Connect the load in parallel with the battery and
charger (note the correct polarity if required by the load).
There is one indicator on the front panel. It will light yellow when the unit is operating in the constant current mode at about
75%, or more, of its maximum rated current. In the constant current mode the unit is not regulating voltage and the battery
may not maintain its charge. This unit should not operate continuously in the constant current mode. This unit should only
go into the constant current mode intermittently as the parallel load requires, or when charging a discharged battery. The
indicator light will switch from yellow to green when the unit is operating in the constant voltage mode at about 75%, or less,
of its maximum rated current. In the constant voltage mode the unit is regulating voltage and the battery is being properly
charged. When the indicator first changes from yellow to green the battery should be between 80-90% charged, depending
on battery size.
To insure a full charge and to help your battery keep its full capacity, we recommend the battery be left connected at all
times. There is no danger of overcharging the battery if the above precautions are followed.
If AC power is lost, then the battery must fully support the load. To prevent battery damage from over-discharging, we
recommend the use of a low voltage cut off (LVCO). A LVCO will cut off the load from the battery when the battery is
discharged and, after AC power has been restored, the LVCO will automatically reconnect the load after the charger has
begun recharging the battery.
This charger can support a continuous load up one half of its rated output current. For example: If the unit is rated for 2
amps it will support a continuous load of 1 amp. This will leave enough power to keep the battery properly charged and to
recharge a discharged battery in the event of a power failure.
If the load is not continuous, it can be greater than the maximum continuous load specification. However, when operating
with a higher current load the battery may not keep its charge and may begin to discharge. The load must be shut off
intermittently to insure the battery is kept charged and to allow the charger to cool down. Allow for a 75% duty cycle when
the load is greater than the maximum continuous load specification.
If the load is greater than the maximum rated output current of the charger, the battery will become discharged. Allow for
adequate recharge time. Use the following formula to determine the minimum recharge time (with the load disconnected):
Recharge hours = 2 C discharge hours C (discharge amps - charge amps) / charge amps.
For Example: If you have a charger rated for 2 amps maximum output current hooked up in parallel with a battery and you
apply a 10 amp load for 1.5 hours, the formula returns a minimum of 12 hours to recharge the battery.
recharge hours = 2 C 1.5 H C (10 A - 2 A) / 2 A
recharge hours = 3 H C (8 A) / 2 A
recharge hours = 24 AH / 2 A
recharge hours = 12 H
Note: It may appear that the charger is returning 24 AH into the battery (2 A C 12 H); However, because the battery draws
less current as it charges, only about 15 AH is actually returned (~1.25 C AH removed).
Battery Mfg. Code:
Two digit number; Ex. 06 = 6 volts, 12 = 12 volts, 24 = 24 volts.
C = dual stage charger (standard); P = single stage, parallel charger (float voltage only).
Three digit number (with decimal point understood to be two numbers from the right);
Ex. 200 = 2.00 amps, 150 = 1.50 amps, 075 = 0.75 amps (750 mA), etc.
Letter code for battery manufacturer (optional)
<Base #> - <Voltage Code><Stage Code><Current Code><Battery Mfg. Code>
HPX30-12P200 is a Model HPX30 single stage parallel charger, rated 12 volts, 2.00 amps.
Base #:
Voltage Code:
Stage Code:
Current Code:
Operating temperature
Storage temperature
Dimensions & Weight
Input Fuse Type
Power Requirements
0 to 35EC (32 to 95EF)
-40 to 80EC (-40 to 176EF)
H 2.90" (7.4 cm) x W 5.55" (14.1 cm) x D 3.60" (9.1 cm), About 3.8 lbs. (1.7 kg)
5 x 20 mm fast acting, miniature glass fuse, UL & CSA approved
115/230 V~, 50-60 Hz, .52 A RMS
Charge Amps (Imax)
Charge Voltage
Switch Amps (Isw)
Max. Continuous
Load w/ Battery
Other Models:
Charge Amps (Imax)
Charge Voltage
Switch Amps (Isw)
Maximum Continuous
Load w/ Battery
2 A ± 2%
13.68 ± 0.12
1.5 A ± 5%
1 A ± 2%
27.36 ± 0.24
0.75 A ± 5%
1.00 A
0.50 A
see marking label
2.28 V/Cell
0.75 C Imax
0.5 C Imax
Refer any questions to XENOTRONIX Inc.
Monday-Friday 8:30am to 4:30pm ET
tel. 407-331-4793
fax. 407-331-4708
Document MN2-HPX30P
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