# Three campers require a 30-amp breaker each and one camper requires a 50-amp breaker. What size main breaker do I need do the sub panel?

• 3 30-amp breakers for 3 campers
• 1 50-amp breaker for 1 camper

Total of 140 amps needed to accommodate the 4 campers.

The main house panel has a 200 amp main.

What size breaker do I need for the sub panel for the campers?

What size wire do I need less than 100’ from panel and campers?

• Do you know how much load the existing house uses of that 200A? Can you get us photos of the house's panel, as well as the square footage of the house? Commented Feb 21, 2022 at 2:57
• How many camping spaces are present? You only need to compute for the worst case per space. For instance if you have 3 spaces and one of them has 50A/30A options, you can delete one of the 30A's. Also, read what ThreePhaseEel says as you misunderstand how amps, 120V and 240V work. 50A taps both legs of the panel, 30A is 120V and only taps one leg. So the total is 80A on one leg, 110A on the other (if you think of it that way). Commented Feb 21, 2022 at 5:03