This is the first I’ve heard of this, but it isn’t surprising. Solar / battery systems generate DC voltage, and houses run on AC. These inverters convert the DC to AC, but they can be expensive and problematic. I have seen all sorts of equipment these days that run on 24V DC, aimed at RVers and campers. I wonder if there will ever be a trend to have DC in houses and eliminate these inverters. Nothing in a house requires AC current. Of course, if you still tie to the grid you will need an AC to DC converter, I suppose.