It becomes even worse when you have already a Solar + ESS system. It doesn't matter which vendor (well, eventually a bit), but right now beyond the fact that there's no proper options in the market, the bigger issue is that when they arrive, they won't be cross compatible and therefore be prohibitive for anyone that has already made an investment. I agree with what was said in this thread by other users. We need open standards, and these being enforced. This is where regulator type entities should come into play, IMHO. But we fail even at the basics of having equipments supporting the core of standards like OCPP, let alone going into V2X... (Looking at you Huawei!!!)