The Turtle power distribution box has a maximum running capacity of 60 amps at 120v.
Each 15 amp GFCI runs off of its own individual 15 amp breaker.
The unit can be powered by either a 50 amp range outlet or a 30 amp dryer outlet.
National Electric code for extended power usage states that you shouldn't exceed 80%. For the extended use of the box, only 12 amps per GFCI should be utilized.