Weather Shield + Power Shield + Photon

Hi all,

I am installing a photon power shield, with a photon weather shield. I plan to power it using a 1200 mah battery and a 50 Watt 6V solar panel.

My question is… Do I need to regulate the input of the solar panel before connecting it to VIN pin of the photon? Any suggestions?

And… How should I configure the weather shield in regards to power selection (3.3v enable, vReg, etc).

I would like to learn how to calculate this stuff, in regards to watt, mah, time that a full charge would be possible with the photon with wifi on, etc. any resource or point in the right direction would be great!