Goal Zero Yeti 400

A portable lithium power station is capable of keeping your cellphones, tablets, and cameras charge and much more.

As it is portable it can be taken anywhere and can be used in the way you like to use it.

It is a quiet one as it draws energy from the sun. It is lightweight and easy to carry anywhere. It comes with a replaceable lithium battery which could run for 18 months.

It has multiple power options. You can use a USB or an AC outlet or a DC as per your requirement.

Recharge from the sun by connecting a compatible solar panel. Charge time is dependent on the size of the solar panel. The Boulder 100 Briefcase will fully recharge the Yeti 400 Lithium in about 8-16 hours.
Source