How much power will my car pc need.?

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it will have a dual core intel atom cpu, in a miniITX board.
2 gigabytes of ram
a ssd
an optical drive

Can i power it on my cigarette lighter output thingie.
 
You will need a power inverter. The larger the better. This is not a laptop motherboard so the power requirements will be higher.

You will need at least a 450 - 500 watt power inverter just for the PC. You will need a larger one if you want to also power a monitor. The larger inverter you can find, the better.

A small interruptible power supply between the power inverter and PC may also be helpful to stabilize the power. If a PC suffers from lack of power, you could have problems with hard drive and memory errors. Look for at least a 500 watt UPS. A smart UPS may be better. These can be connected to a USB port to monitor the UPS condition. When the power gets too low, it will send a signal to gracefully power down the PC to prevent damage.

The link below is an example of what you need. These power inverters are made by several manufacturers. They can be found at most major automotive parts stores.
 
all depends if its a proper 12v car pc...ive done a couple myself to run my ANPR app.
 
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