[indifocus]

I am contemplating building a small oven, interior dimensions of 12"x12"x 48" deep. It will be for only one part that I need powder coated for my business---dimension of part is 6"X24"x.375" thick 6061 Aluminum, or 6"x36"x.5" thick 6061.
I have the shell out of 2x4 studs, interior lined with 20 guage raw aluminum sheet.
I have ordered Rockwool, in 4" thickness, for insulation. Door is held in place by high temp magnetic strip. (It too is 4" thick with rockwool, but has 8x8" Corning glass window in center.

I currently use a small Hamilton-Beech countertop convection oven to cure my parts---they are small, in the .5"x3" size---it works awesome! Heats up in 2 minutes to 400 degrees, circulates in "convection" mode the air properly without too much movement, has a big glass door to check pogress, and oh, yes, it cost $69 at Sam's Club. Also uses only 1500 watts on 120 VAC

Questions:
1. If I purchase another Hammy-Beech convection oven, will the 1500 watts that it outputs be sufficient to cure the sized peice I want? Would two work?

I am limited by 20 amps of current in my shop.

Is there a "calculation program" that I can use to size this oven---rules of thumbs?

Thanks in advance!