A: The USB port delivers 5v, so it will not be sufficient to power a 12v pump. You can contact SolarSynthesis customer support to select a unit that is designed for your application.
A: If the fountain can be powered by USB, SuperCharge7 will be a good solution. You can contact SolarSynthesis customer support to provide details of the fountain to confirm.
A: Yes, you can power a pond using this
A: Yes it would probably work as long as it didnt draw more then the 12v 7ah battery could handle when there is no sun.