Corroded Negative Posts on My Batteries?

Question:

I have (3) Group 27 Gel (actually gel) as my house bank. The negative posts get very corroded every year. Am I doing something wrong?  The positives are fine. - Dave

Answer:

Great question, unfortunately I don’t really have an answer on this one, wondered about that as well.  On my own boat, I regularly clean the battery terminals from corrosion. - Jeff