A high output alternator is only needed for compressor runs that the battery can’t handle. The XD3000 only needs a minute to fill 5 gallons from 0 to 150 PSI and about 11 seconds to top it off. Most batteries can handle that and the alternator recharges it while driving around. An Odyssey PC2150 AGM type battery can run an XD3000 for 10 minutes before the voltage drops and the compressor slows down.