Heard the same thing bro, right with ya. ... . Running one box per alt would be most reliable. So, we put a box on each, and purchased a better turn on solenoid even.Used LARGE gauge wire all around. Really put some effort into it. LOL, like, a TON of late nights. Fuck me.
Still had bugs.
Used large gauge all around, and we still ran into several issues. It took about 4 months of fiddling around to get it to run as reliable as it does now, which, so far, this season, has been fine. But, hell yes, we have 2 spares we take to large (3x, state, and world finals) shows, just because. I will say when shes running good, it runs good. Amps run a lot cooler, and the Xfire 4ks do make a bit of power with that voltage up there. ( I mean fuck, they better eh?) After 2 minute runs, and a starting rev of around 1800, we dip just below 16v after full tilt long average runs. After about 30-45 seconds the motor does start to bog down. So, mike helped us there, getting the turn on for the alt as LOW as he could. ,...... so, thats all neato and shit, but man, was it a constant nightmare for a while. There was a time where i wanted to sell all 20 brand new bats at cost, and swap to just a 14v cell, and charge in the upper 15's off the alts, safe for the rig elc,, then throw them on the 2 chargers we have when ever it sat. I know Rusty at DC Audio does this in his van. Uses 14v cells and charges at like 15.4. Then tosses em on the charger when ever its sitting.
Has it helped our scores? Yep, yep it has.But, man, for the cash, time and pain, ugh.
If i had to do it all over again? Id use 14v cells, and a shit ton of caps. If i could go back.
But, we fought through it, and so far, its been OK.
I highly suggest the KISS method if your just driving around banging.