Go Power converter might be excellent. Just have not read how well they do in various conditions.
Only the 6345 has a separate charging circuit that is now obsolete.
IOTA is a proven solid reliable converter and will charge your batteries great. The IQ controller module changes the converter from a single stage (fixed voltage) converter to a three stage converter. With low battery it steps up voltage for a fast charge and then in two steps drops the voltage for normal use. All multistage converters work this way. I assume Go Power is similar... just have not read much on them.
