Submarine Battery Chargers /Dischargers from 5KW to 2MW


PCTI offers rugged high-current battery chargers to meet all of your high-current industrial charging applications from 25 to 2000A and up to 1000V. Our standard battery charger includes a battery eliminator, float and equalize adjustments, manual equalize timer, automatic shutdown and restart under a variety of fault conditions, low ripple, and paralleling capability. Options include computer interface, discharge capability, DC circuit breaker, temperature compensation circuit and more.

PCTI’s high current battery chargers and systems are at work today in a variety of industrial, commercial, and military applications. Each unit is based on standard designs and custom engineered to meet your specific application.


PCTI DC power supplies are built to customer order from a range of standard power and control modules, and offer high performance, high reliability and sophisticated control systems. A variety of computer interfaces are available to meet all of your power supply programming and control requirements. For high power and typical project profiles, click the buttons at the top right. If you need help in specifying your battery charger request a quote online.

General Specifications


The following specifications outline PCTI’s battery charger product line. Please contact PCTI for options not listed here or for assistance regarding your particular application.

Input Voltages ( +10%, 50/60Hz )
Single: 110, 115, 120, 130, 200, 208, 230
Three: 208, 220, 230, 380, 415, 440, 460, 480, 575
Voltage: 48V, 80V, 125V, 250V to 600V and others as requested
Current: 25 to 2000A
Voltage Adjust: + 5% of rated output voltage for any load variation from 0 to 100% with separate equalize and float voltage settings
Efficiency: 85% minimum
Standard Features
Six-pulse or 12 pulse thyristor bridge rectifier
Constant Current Control
Constant Voltage Control
Automatic Crossover
Regulated Voltage
Regulated Current
Automatic Phase Selection
Soft Start with batteries disconnected
Automatic Restart to Float Mode after loss and restoration of AC input power
Manual selection of float or equalize charge mode
Float Voltage Control per NEMA PE-5 depending on battery type
Equalize Voltage Control per NEMA PE-5 depending on battery type
Battery Charger can act as a DC power supply with batteries disconnected
Standard Protection
AC input circuit breaker
AC and DC surge protection up to 5000 volts.
Automatic Equalize Control automatically places charger in float mode after an AC power failure or charger shutdown
Overcurrent/Overload: 120% for 2 hours
Input and Output MOVs
Front Panel Devices
Float Level Control Potentiometer
Equalize Level Control Potentiometer
Equalizing Timer 0 to 24 hours operable in the manual equalize mode
On/Off Switch
Float/Equalize Selector Switch
AC power ON Indicator
Analog or Digital Voltmeter
AC power ON Indicator
Analog or Digital Ammeter
Float Charge Selected Indicator
Equalize Charge Selected Indicator
Rectifier Failure Alarm Indicator
Input AC Failure Alarm Indicator
DC Undervoltage Alarm Indicator
DC Overvoltage Alarm Indicator
Note: Alarms can provide front panel indication, remote indication, audible alarm and/or shutdown of the battery charger
depending on customer requirements
Computer Interface/Remote Capability
Analog Signals: 4-20mA, 0-5V, 0-10V
Computer Interface: ethernet, profibus, Modbus, CANbus, IEEE 488.2 / GPIB, RS232, RS485
Functions: Start/Stop, Reset, Fault, Current Adjust, Voltage Adjust, Fault Indication, Float selected, Equalize selected
Enclosure Type: Nema 1 indoor, Nema 12 dust resistant, Nema 3R outdoor or Nema 4
Airtight (with air to air heat exchanger)
Cooling: Forced Air Cooling or Natural Convection
Altitude: To 10,000 ft without derating
Temperature: Operating: 0 to 50C; Storage: -40C to 65C
Humidity: Up to 90% non-condensing
Standard Conformance
Optional Features
DC Output Circuit Breaker
Battery Eliminator
Very low ripple
Optional alarm conditions: Output circuit breaker off, Over temperature, Ground Fault Failure
Audible alarm horn
Remote/local selector switch
Remote Control via analog signal or Computer Interface (RS232, IEEE488, GPIB)
Equalize Timer 0 to 24 hours
Blocking Diode to block feed-back through the charger during AC power failure, being remotely turned off, charger internal failure, or other shutdown conditions
Output diode for reverse polarity protection
Battery Temperature Compensation
Parallel and Load Sharing
Delayed Start (charge during off-peak hours)
Ground Fault Protection and/or detection
Battery discharge back to the power line