The amps will be perfect for a pair of Level 5s, but I would stick with 12v. I am running 14v myself just like you are talking about possibly doing and I wish I would have stuck with 12v. I have a single 400a alt to charge my 14v side and have 21 D1400s to power 2 DC7.5ks. You can get away with less 12v batteries than you can 14v. To run 2 aq3500s, I would recommend 8-10 D1400s.