An Elixir ELX-45 would have a 45 amp converter so you'll want a matching capacity like the Progressive Dynamics 4000 Series Mini RV Converter w/ Charge Wizard and AC/DC Distribution Panel # PD4045KA. This power center requires a 10-3/4" long x 7-1/4" tall cutout hole so you may need to make alterations to your cutout hole to cover any gaps. I typically just cut down a 1/4" thick piece of wood to cover the hole and cutout the correct sized hole for the power center to mount to the piece of wood. view full answer...