I use the one recommended by AFLM... a Fujicell SCH808F... works with my Goal Zero 7w panel, 12v dc, 120v ac, and 5v USB... with Sanyo AA Eneloops...I've changed my thinking about running my 3500w genset.... invested in a 12v deep discharge trolling motor with a 12v cigarette receptacle attached to run my hurricane electronics (via AA)

protective cap removed from positive terminal for pic
SCH808F charger