30 Amp is $130. With the Smart Controller $165. I can appreciate your point in getting a quality converter. I am an electronics nut. I also work with huge DC plants at work. 5000 AMP -48V (Telecom) and know how mean DC can be compared to AC.
I like the Iota because it is, with the Smart Controller basically a switch mode rectifier. Also all connections to the battery and load is with 4/0. (I will install a breaker inline)
I am using a industrial AGM VRLA 110 Amp battery. More $ yes, but not having to worry about it crapping out until 7-10 years Priceless.