In series the Voc is 66.15V which exceeds the controller w/o even considering temperature changes. In parallel Vmp is reasonable close. He has 3 different panels which might be a factor in optimal MPPT operation. These 3 panels are best suited for a PWM contoller at least in terms of cost.
Whoever installed his system does not appear to know much about solar. There are many other installation questions like wire size and length for both the panels and to the battery. Also panel location relative to rig shadows (A/Cs etc) can be a significant problem. And who knows if all of the panels are OK. His 28.8A should produce about 18A+ for flat mounted panels in full noon sun.
BTW 470W should be able to produce 30A flat mounted with full sun at noon. Something isn't right with his setup. Can you provide more information?