What is the best way to to turn 24 volts dc into 14.4 volts dc? Answered
I want to make a power supply for my laptop so I can use it for long time while camping. I want to use car batteries. I have tried using just one car battery but this does not work. A car battery varies between 12.6 volts and 0 volts. Most of the energy is gone by the time it gets to 10.5 volts. An inverter is designed to be used when a car is running. The alternator generates 14.4 volts so things which run off of a car alternators operate at 14.4 volts. When I plug my laptop into an inverter which is connected to a car battery sans the car it will only work for a few minutes. The voltage of the battery drops when current is being drawn from the battery. This sets off a low voltage alarm on my inverter.
So new plan is to hook up two car batteries in series running at 24 volts. This brings me to my question. What is the best way to convert the battery power to a regulated 14.4 volts. The battery will be 25.2 volts fully charged and will drop all the way to zero when dead if you let it. Most of the energy would be gone by the time the battery gets 20 volts.
The set up will be
24 volt batteries---14.4 volt regulator---inverter---laptop