It has the 3 prong 30 amp. I don't plan on using the internal panel though, my electrician friend said he could install a subpanel in the trailer being powered by the box outside. He has only seen pics so when he comes to check everything out I guess he will know better. In addition to the 30 amp , there Is also a 15 amp circuit on the outside panel that isn't Being used yet. Based on what I have told you do you think 240v is possible? All I need is a light and tv in my living space so almost all of the power will be used for the grow.