Spatel

I have read this post with interest and would like to ask a clarifying question. i am an employee in a for profit business of which i have no control (not a partner etc) with a 401k and profit sharing plan, which i have maxed at 55k for 2018. I have a small consulting business as a sole proprietor/owner. may I contribute to a sólo 401k for this distinct entity that I control and what is my limit, in order to abide by 415c limits? thanks