To convert from 30 amp service to 50 amp service the best option is the Progressive Dynamics RV Power Control Center with AC/DC Panel and Converter/Smart Charger # PD4560K18LS8.
This is designed to give you 50 amp service and will be a fantastic option for you to upgrade. It is 14-1/8" tall x 11-3/16" wide x 8-1/2" deep overall but fits in a 13-1/4" tall x 10-1/8" wide cut out. That means you will need to build in some supports on the side in order to get this to fit properly, but once... view full answer...