no and no
I have a CarPC with a Duron750 and a 3,5" 5400rpm Harddisk.
The whole thing is running with an 300W inverter, but now in summer the inverter get's very hot and turns off after just 20-30 mins of usage
So I wanted to buy a DC-DC convertor... the 60W ones are pretty cheap, but do you mean they are enough for my Duron and Harddisk ?
Or can I put the harddisk directly to the 14v of the car ?