Going to try and give as much detail as I can so far. I'm in a mobile home, and I have a 100 amp service going into the house. my service disconnect is on the outside mast with the meter, 100 amp disconnect, and in with that is also a 25 amp, 240v (so a double 25 amp breaker) for my AC. I have 1 open spot on my inside panel.
I am wanting to add electrical to my shed outside. I want to do a florescent light ballast, an electrical outlet (which would power a table saw, Ryobi battery charger, and i know I'm going to need at least 2 outlet sets on the outside of the shed for an upcoming project (building a deck and doing low voltage lighting). The low voltage lighting is going to split between 2 low voltage transformers, one for lighting on the deck and the other for lighting in the front of the house. I also will need an outlet outside for a set of outdoor bluetooth speakers.
so here's my question, what would be the easiest way to add a sub panel to the shed? should I use the 25A breaker on my outside service panel, put it at a higher rating, and feed that to a panel in the shed and then put the AC unit on the shed panel. or option 2 of feeding the sub panel for the shed from the inside house panel. in order to do this I would need to replace the inside panel with a new one that has more slots, because other than the open slot, the only single breakers are bathroom receptacles and the furnace, so i know I cant combine them. and also what feeder size would i need for the shed sub panel?