A method for performance ratio-based scheduling of solar system maintenance is implemented by a monitoring computing device. The monitoring computer device includes a processor in communication with a memory. The method includes receiving a plurality of production data associated with a solar system, determining at least one performance ratio based upon at least a portion of the plurality of production data wherein each performance ratio is associated with a range of expected performance values, validating the at least one performance ratio, determining that the at least one performance ratio is outside the range of expected performance values, and adjusting a maintenance schedule associated with the solar system based upon the at least one performance ratio.