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May 20, 2022

DC/DC Battery Charger: Heavy Duty Industrial, Marine, and Military 12 Volt Battery Chargers for use in 48V systems. 5 year warranty.

48 Volt to 24 Volt DC/DC battery chargers
For a 24V battery charger with 48V input click here.

For 12V to 12V, 12V to 24V, 24V to 12V, etc. chargers click here

A DC input lead acid battery charger with 48 volt input to charge 12 volt batteries at up to 20 Amps. Either 2 or 3 stage charge is available, which is user selected.
DC-DC Converters Heavy Duty Industrial
20 Amp
DC to DC Battery Charger
48V to 12V DC/DC battery charger, heavy duty industrial and military
Ingress protection IP66 water resistant case
20 Amp
DC to DC Battery Charger
48V to 12V DC/DC battery charger, heavy duty industrial and military
(The IP66 water resistant case is not this photo)
Ruggedized and wide temperature range
20 Amp
DC to DC Battery Charger
48V to 12V DC/DC battery charger, heavy duty industrial and military
Part Number
and Price
Allow up to 15 days for manufacturing
Allow up to 15 days for manufacturing
Allow up to 15 days for manufacturing
Country of Origin Canada, NAFTA eligible
Input Voltage 40 VDC to 60 VDC
Nominal Input Voltage 48 Volts
Max Input current at No Load mA
Float Voltage 13.6 Volts
Absorption Voltage 14.4 Volts
Switch to Float Current 3 Amps
Max Output Current(s) 20A
Voltage Adjustment ±1V
Max Output Power 288 Watts
Output current limit? Yes
Operating Temperature Range -25 °C to +40 °C
(-13 °F to +104 °F)
-25 °C to +40 °C
(-13 °F to +104 °F)
-40°C to +40°C
(-13°F to +104°F)
Derating 2.5% per °C up to +50 °C 2.5% per °C up to +50 °C 2.5% per °C up to +55°C
Efficiency at maximum output >75 %
Line Regulation <±0.05%
Load Regulation <±0.05%
Switching frequency kHz
Output ripple noise <25 millivolts rms
Noise inserted on the input terminals <25 millivolts rms
Isolation Fully isolated to 1500 VDC input-output, 1500 VDC output-ground, 500 VDC output-case
Low input voltage alarm 40 Volts
Remote power on/off No
Input Fuse MDA15
Connections Screw terminals output
Wire leads input.
Protection Input Under voltage, Output Over Voltage , Current Limiting, Short Circuit (automatic recovery), Reverse Polarity , Over Load, Over Temperature Shutdown
Dimensions 244mm x 208mm x 64mm (9.6 x 8.2 x 3.5 inches)
Weight 3.4Kg (7.5 lbs)
Audible Noise None
Cooling Convection, no fan
Warranty 5 years 1 Year 1 Year
Duty Cycle 24 hours a day, 100% continuous

drawing of the PBCD315 showing dimensions

The following table describes the display of LED lights at different stages of charging:
Q: Can I leave the battery continuously on the charger?
A: Yes, the charger will go into "maintenance mode" and keep the battery topped off.
Q: Can I draw power from the battery when the charger is connected?
A: Probably. . . There is some pulsing going on with the charger which your equipment might not be happy with (it is a pulse-charger, 1 second pulses with 20mS gaps), but if you combine this with the battery the battery will fill in the gaps, so the ripple is no more than it would see in an automotive application.
Q: If I discharge the battery while the charger is attached will the charger maintain a full charge?
A: Yes, When the charger detects that the battery voltage has dropped it knows that the battery needs to be charged and goes into "bulk charge" mode again automatically.
Q: Can the charger be left connected to the battery when the charger is not turned on, or when the input voltage of the charger has been cut off?
A: Yes.


OEM Battery Chargers Charging lighting system batteries, and scooters in a 48Volt telecommunications, train, locomotive, boat, or electric vehicle.

OEM Battery Chargers Fully automatic without intervention.

OEM Battery Chargers Output short circuit and battery polarity protections. Input low voltage and high voltage connections.

OEM Battery Chargers Charging 12 volt "jump start" batteries from a 48 volt tow truck or service vehicle.

OEM Battery Chargers Charging 12 volt electric bicycle from a 48V golf cart, telecommunications system or locomotive.

Universal Power Input OEM Power Supplies and OEM Battery Chargers Three stage charge--constant current, constant voltage, and float. It is suitable for any size 12 volt lead acid battery.

Installation Notes:
  1. A qualified automotive electrical technician should be used to wire the charger into the vehicle.
  2. The PBCD315-48-12 converts 48 volt power into 12 volt power with 75% efficiency, so for a 20 amp output the input needs over 4.4 amps. Make sure that the wires connecting the are adequate for the current and the length of the run. If the voltage drop in the wires are too much the "Low Battery Voltage" alarm will come on. Wires that are too small may also overheat and melt the insulation, causing a dangerous situation. 12 gauge is usually adequate for runs up to 20 feet of wire (adding together the positive and negative wire lengths).
  3. It is OK to leave the unit on the charger when the power to the charger goes on and off.
  4. Mount in an area that will get adequate ventilation and will be free from rain, spray, or excessive dust.

Model PBCD315-48-12 DC input battery chargers. DC Input Voltage 40-60V Charging Voltage 12V Nominal, 14.4 volt maximum. Maximum Charging Current 20A Charging method: multistage charge. Protections include (1) Input and output polarity protect (2) Output short circuit protect (3) Over temperature protect

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