I don’t worry about cheap mc4 connections… or good ones either…screw em all…..after seeing how fragile and “iffy “ they are made( a dollar apiece Haa) .I cut all of them off every panel and crimp on high quality removable push on heat sealed with glue connectors rated at 45 amps …they are water proof and come apart with a simple pull… and then go back together with another push…
I use them for all electrical connections now for fast easy disconnects on the RV, car, mowers, all the solar panels , and pumps and stuff…
Yeah…yeah…
Not to beat a dead horse but I hate cheap shit…