A collateralized debt obligation is a type of structured asset-backed security. This was the security product that caused the 2009 Global Financial Crisis. Investopedia provides a simple and detailed explanation. Or wiki it and learn more about it.
Is your Clenergy solar inverter showing a FGCI fault on the screen? GFCI - Ground Fault Circuit Interrupter It means that inverter has detected a ground fault (electricity going where it should not be). I found this issue and there is nothing I could do about it besides calling up the installer/electrician to replace the unit. Good Luck!