Having used the Solar CTs for non-standard probing of devices (i.e. not to monitor a solar inverter) I have wondered about the calibration cycle details:
According to the install guide you need a minimum of 150 watts being generated during the calibration cycle. i.e. Startup or a reset (?) at night won’t work.
Would be interested to know what the outcome is here @oasis so please report back what support advises.
I agree with @james_reilley’s suggestion here for the periodic loads … some users think that a device meter will emphatically go on/off when flipping breakers, which is sometimes not the case. In your situation though, looking at the Mains meter, you can easily identify when the periodic load drops. I would suggest also using Settings > Signals for that because then you can ID the phase (leg) the load is on and determine if it’s 120 or 240V.