bgrkovic

http://ftps.voltronic.com.tw/E/Easunpower-93CB312922AC474787C6/
Take it from voltronic server.
 

So a bit like some cars (my Corolla for example) already have cruise control in the ECU and just require a bit of extra wiring/hardware to actually make it work? And then the dealer sells that option at 20 times the actual cost? :-)
I have a gut feeling -- not being enough of an electronic engineer to work with anything else -- that inverters with paralleling capability likely have a bit of buffering or decoupling or whatever one would call it built in to smooth out slight mismatches in the paralleled waveforms and to ensure power sharing, so one side doesn't work harder than the other. They cannot be exactly in sync, no two power transistors are ever exactly matched. Skipping that on the lesser inverter model would be one of the first things a manufacturer would do to save costs. As I said though, just a gut feeling.