The Nomad 20 is built well, and works as promised (no solar panel matches the marketing specs for power output). I needed the direct DC 18 volt output, which most other manufactures do not offer. If only used for cell phones, etc., I would have looked at the RAV Power 15 or Ankor Power Lite for a much lower price. Goal Zero builds a top quality unit, but they command a top price for it. This unit charges my smartphone in less than 4 hours, and works with my DC charge regulator (also Goal Zero) for lead acid batteries.
This review was written in the old system and had content requirements that are different than reviews written today.