70 Watt 24 volt to 12 volt DC/DC Converters

To determine the amperage you need just add up the watts of all the equipment and divide by 13.8 volts.

DC-DC Converter	70 Watts continuous DC to DC Converter Application Notes
Part Number and Price
	PST-D24/12-100 Quantity 1-9 $43 10-99 $37
Continuous Current	5 Amps
Peak Current	10 Amps
Input Voltage	20 to 28 VDC
Max Input current at No Load	100 mA
Output Voltage	13.8 ± 0.1 VDC
Output Adjustment	12.5-15.5V with internal trimpot
Max Output Current(s)	10 Amps (1 to 5 minutes)
Max Output Power (continuous)	70 Watts (5 Amps)
Max Output Power (milliseconds)	138 Watts
Output current limit?	No
Output Plug Type	Flying leads (Available with cigarette lighter plugs and sockets, click here)
Efficiency	85 %
Line Regulation	±70 mV
Load Regulation	±1%
Switching frequency	25 kHz
Output ripple noise	100 mV rms
Remote power on/off	Yes
Protection	Over Voltage , Over Current, Reverse Polarity , Over Load. NO SHORT CIRCUIT PROTECTION.
Connections	8 inch flying leads
Dimensions	40 x 150 x 43 mm (6 x 1 9/16 x 1 11/16 inches)
Drawings	Click Here for Drawing
Weight	200 gms (7 oz)
Isolation	Common negative ground
Temperature	0 to 40°C, 25 degree rise above ambient at continuous full power
Additional Features	Passive Cooling
	PST-D24/12-100

Advantages:

Inexpensive High Current Switchmode DC/DC Converters.

High efficiency.

Excellent line and load regulation.

Wide input voltage range.