This is a kludged setup for sure.
The observatory will be using *maybe* 10-15 amps ever, and rarely. Like, one day a week. Computer, some LED lights, a portable AC unit. Biggest draw will be the motor that opens the roof, 7 amps for 2 minutes, twice a night, once a week, So, 40 amps is WAY over the requirement.
I want to put a single breaker on the left leg. The two 100 amp breakers currently feed two (honest to god) skeet shooting buildings and some MASSIVE LED spot lights. NONE of that is actually being used, it all belonged to the previous owner.
This is 100 acres of wooded ranch, no one cares about code.
Yes, the meter is next to this. Coming out of this box is the two 100 amp feeds, a 20 amp feed down into conduit that feeds an outlet at a picnic site 30 feet away, and 20 amp breaker feeding an outlet on the back side of this box.
I *hoped* to install a 40-50 amp breaker in this box, feeding a direct burial line into a subpanel like this:
https://www.lowes.com/pd/Square-D-100-Amp-6-Spaces-12-Circuit-Main-Lug-Load-Center/3134331
Then a few romex lines feeding some outlets and some LED lights.
I picked that box with 6 spots because it was requested that I put a surge arrester in there, which takes 2 slots.
Edit: Also, I don't thing there is a main disconnect. It's clearly not in this box, and the meter as far as I remember is just a meter. That's why I mentioned doing this install while hot, because I don't know how to make it not hot!