MMPT 80-600 charger fault codes over and under charging
I have a pair xantrex mmpt 80-600 with a hybrid inverter first four months it worked flawlessly now I nave one MMPT that has constant fault code of over voltage and under voltage it wont reset itself and stays off. The solar company takes months to come out and they each time just change out the cat five cables and restart. It will fail in just a couple days again same codes. any ideas what would cause this its a 48 volt flooded system. I seem to know more that the tech they send out. I have two arrays one goes to the grid and the other goes to dc circuit breakers that split that array in half and split the load to each solar charger so not only am in not charging with one charger it appears half of my array is not selling as well. The installers seem as afraid of this monster as I am.