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Wires switched. Now ADC0 and ADC1 are paired and Vcc and Gnd are paired.

Edited the code from:

Code:

#if (Solar_Sensor == 2)      // Apogee SP-110: Self-Powered Pyranometer (Solar / UV interface R2= 4700 Ohm)         if (RX_Data[2] <= 13) RX_Data[2] = 0;         SolarRad = map(RX_Data[2], 0, 1023, 0, 1600);              // Using OP - Formula outputs an integer, between 0 and 1750 W/m2         //SolarRad = round(((RX_data[3] * (1100 / 1024.0)) * 5);   // Not using OP. Sensor connected directly to ADC input       #endif

To:

Code:

#if (Solar_Sensor == 2)      // Apogee SP-110: Self-Powered Pyranometer (Solar / UV interface R2= 4700 Ohm)         if (RX_Data[2] <= 0) RX_Data[2] = 0;         SolarRad = map(RX_Data[2], 0, 1023, 0, 1600);              // Using OP - Formula outputs an integer, between 0 and 1750 W/m2         //SolarRad = round(((RX_data[3] * (1100 / 1024.0)) * 5);   // Not using OP. Sensor connected directly to ADC input       #endif

And so far no fluctuations in the readings. Last night it continuously varied from 0 up to 3, back to 0, up to 6 sometimes. That can be seen on last nights Cumulus MX graph before I added the line to clip anything below 6.

Of course I also forgot to stop Cumulus MX before I yanked the sensor connector off the TX board. Now I have to edit all the ini files and logs to delete the solar readings at 10pm at night, LOL. Oh well.