First of all the unit looks great and attaches well to 4 gauge wire on the expensive automatic switch. I bought the 80 amp version but I am giving this review for the 50 amp model as there is a major safety issue. My 80 amp version is used on a system that runs at 60 amps for about 3 hours a day. The device runs almost every day. I called tech support and they said maybe this unit is in fact the 50 amp version. I couldn't tell from the device. This is a big inconvenience for me, I need to…