Thanks again for the feedback. A short while ago, before you had responded, I tried moving the CT on the steam humidifier down to input 7 from input 3. The HVAC is on input 4. I still see the spikes. Just wanted to rule out the proximity of the inputs on the IoTaWatt board.
That 40A at the top left is indeed the HVAC.
I buttoned the panel back up yesterday, but I’ll try moving things around the next time I have it open. I’m going to order some more CTs for a few other circuits. I had only ordered a few the first time around because I wasn’t sure I was actually going to go through with the install. Now that I’ve done it, I’m feeling a little braver trying to cram these guys into the panel.
I’ve looked at the other inputs I’m actively monitoring and can’t really say what it is that occurs around 4:20 that causes the low level noise to elevate like that. Maybe once I’m on some other circuits it will be more clear. Not sure what would have been active at that time of morning except for the HVAC.
Here is a shot of my whole panel. Sorry about the lighting. Will try to get a better one next time. HVAC CT is top left, just to the left of the mains CT.