mwmcginn i don't use laptop, just on the photo i plug laptop because at the moment i don't have power suppy
RedGTiVR6 u are right, but i check my local stores and polish internet stores and nobody have dc-dc converters so i buy power inverter. I now person who have that power inverter and everything work fine.
About starting everything, i think it will be after plug car key, and after then i can turn on carpc or radio. When i take out key everything is turn off. I now i will have to turn on manually pc, but for the moment i'm starting with all of that so i think in the future will be some upgrades