Response to Hello Sunny.   The Century Motors V-Green 2.7 HP Variable Speed Motor ECM27CU is a compatible replacement for the Hayward Super Pump SP2615X20.  The flexible programming options of the ECM27CU will allow you to tailor a running schedule to address the two-story solar usage and decrease RPMs to conserve energy in times when solar activation is not desired.  The fact that you have a 2.0 HP motor currently installed indicates a minimum horsepower required to send water through the two-story solar panels.  It is recommended that the motor shaft seal, seal plate gasket, and diffuser o-ring be replaced concurrent with the new motor.  The GOKIT3 contains the necessary parts to complete this project.  Tune Up Kit Hayward Super Pump - GOKIT3

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