Got a question for you guys. I want to run some of my 12V equipment in my house but i want to use 110 to power it. I know i can get converters to convert 110 AC to 12v DC. My question is how many amps does it need to be? They make 12V 300MA all way to 12V 1000MA. How many amps should i get to power a 12v electronic. Most batteries have different cranking amps so does it matter? i was thinking a 12V DC 500MA would do the job. What do you guys think?