Storing car in shipping container

I've been running a dehumidifier for about 4 or 5 yrs, 24/7. I bought it from Costco online. it cost less than a couple hundred dollars. You can hand drain the water it collects, but I opted to go for the automatic drain. It has a convolute plastic hose, that I just draped into the sink in my garage. You can select the humidity percentage you want to maintain, and it keeps it there by itself. I never noticed any increase in my electric bill, but it has to use some electricity, just not a huge amount.