[Electric Boats] Hi amp controller?

Any one know of a controller that will output more then 400 amps
continuous at 48 volts? The best I have found so far is:

Synkromotive Controller
Dimensions
L 9" (22.86cm)
W 4.45" (12.06cm)
H 4" (10.16cm)
• Operating Frequency — 20,000 Hz
• Operating Temperature Range — 0c—45c (32f - 113f)
• Operating Voltage Range — 24 - 156v
• Standby Current — < 5 milliamp
• Motor Type — Series Wound DC
• Peak Output — 700 amp
• Nominal/Continuous Output— 400 amp
30 second — 700 amps
2 Minute — 500
• Voltage drop @ 100 amps — 1.5v
• Controller Resolution — 8 bit
• Programming Interface — PC Compatible GUI
• Data Connection— USB
• Key Input Voltage — 11 -15v
• Throttle Input — 0 - 5kohm
• Thermal Cutback — 70 c (158f)

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