I would like to design a buck converter to use a PV panel to charge a 11.1V 3000mAh 3S 30C Lipo battery.

I want to choose the minimum inductance for a CCM ($L=\dfrac{V_{out}T_s}{2I_{out}}$), what is the output current that I need to charge this battery? should $V_{out}=11.1\text{ V}$ and $I_{out}=3000\text{ mAh}$?

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    $\begingroup$ 3000mAh is not a current. $\endgroup$ May 31 '17 at 14:50
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    $\begingroup$ LiPo batteries require a strict CV/CC curve to charge correctly and safely. I suggest that you take the time to research the charge characteristics of lithium polymer batteries before playing with them. $\endgroup$ Jun 1 '17 at 0:03
  • $\begingroup$ Agree with @DonaldGibson. You can just buy an off the shelf LiPo charger and hook your PV panel up to it. Most LiPo chargers accept DC input over a fairly generous voltage range that should be suitable for your PV panel. $\endgroup$
    – Daniel K
    Jun 1 '17 at 1:42

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