First off, I never have been big into car stereos. I'm in basic electrical class for automotive maintenance. I've decided to stop trying to be boy racer but instead get a automatic car that's comfortable with a nice stereo set up. I have an understanding of the basics to electricity from class and I skimmed through the basic info sticky. So onto my questions: Set up: Say I wanted to set up a car stereo with a computer, touch screen monitor, amplifier, subwoofer, and speakers. I would want to get an extra battery mounted in the trunk so I wouldn't drain the more important engine battery. Question set 1: To power the computer and monitor I need AC voltage. So I'd need an invertor, correct? Does the inverter ground back to the battery? If so would I want to ground directly to the battery instead of the frame since it may interfer with the main battery? Question set 2: With the amplifier, I'd hook the amp to the battery and the subwoofer and speakers off of that, correct? Couldn't I just hook the amplifer and inverter in parallel to each other? Question set 3: And because of the voltage drops across each resistor, how would the battery get it's charge back? Would the two batteries have to be hooked in parallel to each other so it gets charge back from the alternator? If so, could I/would I need a more powerful alternater if this is the case? That's all the questions that I've thought of so far since starting to plan this process. I do understand it may be confusing so just ask if you have any questions. I hope this is somewhat organized although I do understand it's long. And you must take this with a grain of salt since I'm only a couple weeks into this electricity class and am trying to run before I can crawl. Also, some of the basic questions are there just to make sure I'm understanding the idea correctly too.