There is not any soldering involved if you buy the unit from the link I posted. It is a quick job (less than 15 minutes) to get the system going after install.
Sanyo also states that it is the magnet in their DC motor that gives them the high SEER. The inverter just matches the load (selected) to keep a nice power factor on your AC. It would be ironic (to me) if the setting I am using was the MPPT of my array. Nah don't go there..
Thanks SG for the current read on Tax law