I am looking into using a capacitor to buffer voltage drops for a 12V solar power system. Since it seems I need a pretty big Farad number to give at least half a second of buffer time for my load, I noticed that there are plenty of large capacitors for sale for use in automobile stereos. It seems like a good way to buy an inexpensive, well-packaged cap.
My question is, would using something like this be any different than using a "parts" capacitor from one of the big electronics sites? Would there be any special considerations or things to look out for? Another possible advantage is that some of the more expensive ones offer things like polarity reversal protection, which would be nice because of the high Farad value.