Sol expert solar motor with drive 0 4 5 9v dc sol expert rf300ca p this solar motor with drive from sol expert has been designed for the mabuchi rf300ca solar motor and is equipped with a pleasant rotation speed of about 16rpm which can be reached at 0 5v and the 27 1 ratio ideal for all models that are supposed to rotate slowly br p sol expert solar motor with drive 0 4 5 9 vdc motor shaft length 10mm shaft