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Yeah dude, those SFB amps are beasts. You gotta feed the beast. I feel like doing the big 3, at least 270 amps of alternator (more is always better, you can't have too much electrical) and 2 80 ah (or more) AGM batteries should scrape you by. Or, if you're willing to do a battery delete, 1 lithium and 270 amp alternator should suffice. 

2011 Chevy Silverado under construction

My build log here. Check it out! 

 

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Wired at what nominal load?

Id bet a second battery would be more than fine, with some up graded wiring. 

If your just doing music, not burping, wired down, youll be ok, adding a second battery is all. No need for 11 alternators for what, 1800 watts. (on music), and yes i know, it says it does 3k at 1ohm, but unless your wiring down to like 1/4 ohm, and doing burps, youll be ok, Music is dynamic, you wont see anywhere near full output, or load. 

 

Edit- replace your oem battery with a nice stout one, with (obviously) needed wire.  Play it, watch your voltage, add a battery IF needed. Bet you may not even need that. Cheers. 

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