Solar Powered

Solar Powered is a perk in Fallout 3, Fallout: New Vegas and Fallout 4.

Fallout 3 and Fallout: New Vegas
Unlike Night Person, which operates both indoors and out, this perk only operates outdoors. It is in effect between 6 AM and 6 PM. It synergises well with Rad Absorption for healing minor health damage and minor radiation poisoning while exploring or fast traveling.

Fallout 4
Rank 2 heals roughly 4 rads per second, meaning the Sole Survivor can go from the brink of death to completely radiation-free in approximately four minutes. This effectively renders Lead Belly useless, as any small amount of rads from food or drink are nearly instantaneously absorbed. Thus, it is recommended to take this perk in lieu of Lead Belly. Rank 3 heals the Sole Survivor by 0.5% of your total health every second.