I'd say 3 amps requires 2 GOOD batteries minimum. If you're going to power up 4 Pro 80s, thats another 1000W rms approx on top of the 800W or so you currently have.
'06 X2 MCX
"I understand why some people may not want to do this the way I have recommended but I can't understand the death grip some people have on a toilet plunger with a hose fitting." -JimN