It appears we are dangerously close to a pointless pissing match over reading comprehension. As I understand it, the original post is about whether or not the guy should buy back his total-loss vehicle in order to use the battery pack in a DIY powerwall type project. I think my edit is very much on point with some of the issues affecting that analysis -- they may be obvious to you and me, but perhaps not so to others. Everyone was new to this stuff at one time. My gut hunch is that the OP would be better off junking his crashed car and buying cells appropriate to whatever goals he has for his project, but only he has the data to sort out whether that is correct or not.
I'll help you with your statement posing as a question: the unavailability of Woleg's "custom gateway" (or any information necessary to replicate its functionality) is exactly the problem for the OP. Perhaps you have a solution to that which you are inclined to share? Woleg has basically stated that he won't share, ostensibly to keep us all safe from ourselves, so a big piece of the original question remains unanswered. Maybe you are more disposed to sharing knowledge which would benefit MANY people in similar situations. Until there's any kind of a standard for communication protocols between myriad inverters, batteries, and BMS systems -- and I see little market incentive for any such standard to form -- these questions are going to remain major issues for DIY project builders and hobbyists.Wow I don't understand all the confusion???
If you look at Woleg's footer it just about explains it all....
HVDC 36kWh Renault (ZE40) -> Renault BMS/PWM Contactors -> Custom gateway -> FoxESS 5kW AC (Jul 2022)
HVDC 52kWh Renault (ZE50) -> Renault BMS/PWM Contactors -> Custom gateway -> FoxESS 6kW H1 (Jan 2023)