Works great on 12 volts, with 85W Matrix panels in parallel, my preference anyway, since I can switch off breakers in my home made combiner and immediately see what each panel is doing by itself. Of course I can't compare it directly to other controllers, but the display is useful and I can see the unit cycling to milk the last photons out of late afternoon sun. The 500W capacity suits me, allows room for expansion with additional panels. Looking into the box, this old electronics tech sees a pretty fair price there. The parts cost alone at retail would likely be comparable to the selling price. My only complaint: Didn't get a response to 2 email questions to BZ that I ended up answering by direct experience instead. A small company with floods of emails? Let benefit of the doubt be granted. Bottom line: it works for me, I'd buy it again.

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