I don't know if you are familiar with the company motion labs. So what I want to know is how many 15 or 20 amp breakers I can run using a 50 amp breaker as the main.
You see what I'm trying to do is use a portable sound system in my church sancturary, and the thing is their circuit breaker panel is already full from top to bottom. If that can't work my church also has a power outlet that is mounted on the outside of the church that is used to power rv`s. please help me.
What I'm hooking up to unit is 3 power amps one per breaker and 4 rack equipment components, 3 of the components each will be pluged in with the power amp.

The issue is not how many outlets you can have on a 50 amp feeder,it is how much load a 50 amp feeder can serve.

You can connect no more than 12,000 watts, or 6,000 per each of the two hot legs, assuming you have 120/240 volt single phase service.

You can have as many outlets as needed, just cannot exceed 12,000 watts.

And this assumes the show is no longer than 3 hours. If so, then the max load will be 9,600 watts, derating the 12KW by 80%.

How do you plan to connect these outelts to the 50 amp outlet? Do you have a portable distro panelboard?