My experience has been unless it's for a larger group, or for an extended hunt (say 7+ days or so), or if you have lots of gadgets or plan on using a lot of gadgets - you're probably better off just bringing an appropriate number of battery packs. Our experience is one medium sized pack can keep a person's phone/camera/gps/satellite going for 5-7 days of moderate use. A decent solar charger is going to likely weigh a couple pounds and depending on where you are goat hunting you are at the mercy of the sun shining.
If its being shared, is a long trip, your watching a movie in your tent at night, and/or if you are guided and not carrying all your gear - they can make a lot of sense. Good luck - goat hunts are great!