If already cold a fridge should use very little power on an ongoing basis. The peak draw should still be high if it is running the compressor, but the peak may only be for a few seconds or even less. So an 800W fridge may peak at that full draw for just long enough to start the compressor then drop down to something similar to what you said you had for the rest of the cycle. If it were empty and warm to start I would expect a higher load for a while, but again, the big draw is starting the motor,kicking off the compression cycle, so 150W is reasonable to me.

They appear black because they do not rreflect light but rather than absorb photons as heat they absorb them as electricity. This conversion means they do not get hot like a painted black surface does. In fact, solar panels are heat sensitive and become inefficient if too hot, so some have cooling on the back side or even water cooling.

Orgzly is my favourite note app. I use that and sync to a folder which I can then sync with Syncthing to my desktop and have versioning there.