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The Kelly KEB series of upgrades, most of the Kelly KEB series brushless controller upgrade for KEB-X, its performance is enhanced.Compared with KEB, KEB-X peak current and persistent current has increased. But the price has not changed, more cost-effective.http://kellycontroller.com/Electric-Sco ... roller.php

Kelly Ebike Brushless DC Motor Controller
Model peak(A) per (A) Power(Walt) Voltage(Volt)
KEB48200X 150A 60A 2KW 48V
KEB48201X 150A 60A 2KW 48V
KEB48300X 200A 80A 3KW 48V
KEB48301X 200A 80A 3KW 48V
KEB48400X 280A 110A 4KW 48V
KEB48401X 280A 110A 4KW 48V
KEB48600 350A 140A 6KW 48V
KEB48601 350A 140A 6KW 48V
KEB72300X 150A 60A 3KW 72V
KEB72301X 150A 60A 3KW 72V
KEB72450X 220A 85A 4.5KW72V
KEB72451X 220A 85A 4.5KW72V
KEB72600X 280A 110A 6KW 72V
KEB72601X 280A 110A 6KW 72V
KEB72800X 350A 140A 8KW 72V
KEB72801X 350A 140A 8KW 72V
KEB72100 450A 180A 10KW 72V
KEB72101 450A 180A 10KW 72V