A method for starting a battery driven motor, wherein an input voltage is
measured continuously. In case the input voltage becomes smaller than a
predefined minimum voltage the attempt to start the motor is stopped and
the maximum permitted current level to be supplied from the battery to an
electronic unit of the motor is lowered before the next attempt. This is
repeated until the input voltage is larger than the minimum voltage and
the motor is no longer in start-up mode. The method protects the battery
from collapsing. The method is suitable for starting battery driven
motors for driving compressors. The number of attempted start-up
sequences may be counted and on the basis of this it may be determined
that the battery is weak or that the wiring is misdimensioned.
Furthermore, a control system for controlling starting of a motor.