What size ground wire do I need for panels with a combined ISC 132 amps. This is the ground wire that attaches to the rails that the panels are mounted on. The panels will all be in parallel. Do I multiply this number by 1.25 or 1.56. Some website say #6 is good to 200 amps for grounding solar panel grounding purposes while I see only 150 on other websites. Should I use #6 or #4?
