Digital Output 0: AC Power Input Solid State Relay, 250 VAC/50 amp Digital Output 1: Digital Output 2: Digital Output 3: Digital Output 4: Digital Output 5: S2 (Black Socket Marked S2) Solid State Relay, 250 VAC/50 amp Digital Output 6: S1 (Black Socket Marked S1) Solid State Relay, 250 VAC/50 amp Digital Output 7: S3 (Black Socket Marked S3) Solid State Relay, 250 VAC/50 amp AnalogSensor 0: AC Power Output delivered to S1 AnalogSensor 1: AC Power Output delivered to S2 AnalogSensor 2: AC Power Output delivered to S3 AnalogSensor 3: DC Current (amps) generated by sun AnalogSensor 4: DC Current (amps) loaded on the battery Bank AnalogSensor 5: Inside Temp in Degrees Celsius AnalogSensor 6: Battery Voltage AnalogSensor 7: AC Power input Current (amps)