Guinea Pig, yes... spent an obscene amount of cash of relays contactors & even had some made to spec the 500A & 1000A SSRS.
and now I am still using the First Generation of DCC. I have one latest generation DCC en-route to complete my final pack going into my bank, shipped Air Express this morning with other goodies. While you hang on the complainers and those who had issues, yet there are far more folks out there not having any issues and yes they are talking about it on other forums too... IN FACT, that is how I found out about chargery a Couple of years ago, from people using them for recycled EV cells.
The FIRST Generation which is what I posted at the START OF THIS THREAD were updated and changed, lugs are farther apart... Then came the ISO Boards and external adapters which WE here asked for and Jason @ Chargery responded and met the need....
Also to the point, I run DCC-300's and have pulled 250A and pushed 150A through them and they only got warm, not hot and the fans barely came on and that happened when I covered the vent holes (because I wanted to see, what would happen).
BUT a qualifier for that... My Powerhouse is heated to 50F in winter and in summer it never goes above 27C/81F because it is as insulated as my house is with Thermally broken walls with 6" of Foam (5" between studs, 1" between studs & sheathing) and a Cool Roof system for passive venting and a thermal break as well. Not at all typical in most places.