I have the Goal Zero Nomad 13 (2 panels) and the Nomad 20 (3 panels). I also have the Goal Zero Sherpa 100 power bank. I have not used my Goal Zero stuff with my Spark or the Charging Station yet but will have a chance this summer when I travel to British Columbia and do some hiking and camping.
I used it with my iPhone, my DSLR
batteries and my laptop a few years ago when we went to the Bay of Fundy and were without power for 12 days. The problem I ran into there, was that we only had a few days of clear sunny weather, the rest of the time it was cloudy and rainy.
The solar panels work well for charging the power bank but take a lot longer than plugging into an outlet. The time it takes to charge from solar panels is directly related to the amount of sunlight available and the size or number of panels being used. Bright sunny days with no clouds will charge much faster.
You might want to have a backup like a charger cable that can use the cigarette lighter in your vehicle. When we went to Fundy I used the cigarette lighter to charge the power bank and the solar panels were on the dashboard and used to keep our phones charged up. I would then use the power bank which had a normal outlet to charge the laptop and camera
batteries.
Hope this helps.
Chris