How to use a 10W 6V solar panel to charge a 3S LiPo battery (11.1V)

[jim-p]

@maxpolzin

with a reference voltage set through an analog pin of my arduino.

You said monitor it manually not automatically with an Arduino.
I don't know of any off-the-shelf components you can use to build an Arduino based battery charger, that would be safe to use.