Understanding a motor's specs
The Voltage and DCR (DC resistance) of the motor determines the maximum stall current and power drawn by the motor and rated current is much less than this at rated speed.   \$P_d{_{max}}= V^2/DCR\$

Back EMF rises with RPM so current drops with a fixed load, but current depends on torque which is max at 0 RPM and full voltage, so a soft start is necessary to prevent excess heat 2000W at room temp and less power at elevated ambients. Motor cooling will help.

It may be capable of drawing perhaps 10x the power at 60V stall speed but unable to dissipate the heat. Thus a well designed controller is recommended with thermal monitoring of batteries and motor.