How to wire main feed in a tiny house subpanel for 120v and 240v?
Setting up the panel for a 120v 30 amp RV outlet would be my starting point. I would get a 50a 4 wire cord and wire it in the panel like normal red/black on the 2 main buss bars the white to the neutral buss and the green ground to the ground buss. Since this will be a sub from another feed the neutral and ground busses need to be isolated. Pull the green bond screw from the neutral to the case Or bonding wire out. Now wire the plug but don't use the one of the hots. Now in the panel use ether odd or even breakers the side connected in the plug. Later you will be able to change to the 50amp plug and the other side will be hot and you will have 240v available. I doubt both the hots will fit the 30 amp plug that's why I would only connect 1 at the plug, jumpering the 2 hots while on 120 could be done but is not safe in case you forget and put the 50a 240v plug on then there would be a direct short, not good. But with this method you would only need 1 cord this would save quite a few $.