Patent ID: 8237397

Claim:
A solar energy controller for charging a rechargeable battery, the solar energy controller comprising: a charging control unit, operable to output a plurality of charge voltages; a switch control unit connected between the charging control unit and the rechargeable battery, to receive a break control signal from the charging control unit to disable charging between the rechargeable battery and the charging control unit, the switch control unit also to receive a charging control signal from the charging control unit to enable a connection between the rechargeable battery and the charging control unit, wherein the switch control unit also receives a voltage detecting signal from the charging control unit to output a detect voltage corresponding to a charge voltage of the rechargeable battery; and a comparing unit, to receive the detect voltage in response to the switch control unit receiving the break control signal, and correspondingly output at least one selecting signal to the charging control unit; wherein the charging control unit determines the charge voltage of the rechargeable battery according to the at least one selecting signal, and outputs a corresponding one of the plurality of charge voltages to charge the rechargeable battery in response to the switch control unit receiving the charging control signal.