I don't know the answer to your question but I would give a few pieces of advice:
Go bigger than you think you need...and then go bigger than that.
Get a "Commercial" rated freezer - they only cost a relatively small amount more but will use less electricity because of better insulation. I also believe they will have a longer service life based on my personal experience so they'll save money in the long run.
Put a thin layer of Vaseline on the rubber door seal - this makes a better seal than "dry" and will help prevent frost build up.
Pay a little extra for a model with casters on it if you can fit that in your budget.
I don't know the answer to your question but I would give a few pieces of advice:
Go bigger than you think you need...and then go bigger than that.
Get a "Commercial" rated freezer - they only cost a relatively small amount more but will use less electricity because of better insulation. I also believe they will have a longer service life based on my personal experience so they'll save money in the long run.
Put a thin layer of Vaseline on the rubber door seal - this makes a better seal than "dry" and will help prevent frost build up.
Pay a little extra for a model with casters on it if you can fit that in your budget.