Re: Does it exist?
It's a quad, but the Xtar VC4 is USB powered (through a special cord) and will do up to four Li-Ion or NiMH cells. According to the manual, each channel is independent, and capable of handling either type of cell, regardless of what other cells might be also charging at the same time.
I haven't tried directly charging from my solar panels, but I have used the panels to charge a power bank, then used the power bank to run the Xtar. This was using my Anker 13 watt portable solar panel. Once I get my Renogy 100 watt panel setup working, I should be able to go either way, or use the 12v battery if the panel is shaded at that time. (Although I think that even a shaded 100 watt panel should be able to directly charge one of our normal chargers)