Ok, so to produce 3000 watts of constant power you will need 96 amps of current availible extra from your alternator. Lets assume you have a large v-8 car or suv with a 130 amp alternator. Just to run your car and your "amp" you would need a 240 amp alternator, not to mention upgrade ALL of your charging system, not part of it some of it but ALL of it. Since you are in OHIO I would recommend OHIO Generator as they make a killer alternator. They seem pricey, but not as pricey as replacing amps, batteries or your ecu and they stand behind your product provided it was installed by one of there dealers or professionally. BTW I didnt pull the 96 amps out of the air, I used ohm's law.