Hi Jon,
I'm glad you found the
SDK webinar
useful for getting started with your MATLAB model.
By "conversion efficiency," do you mean the inverter DC-to-AC conversion efficiency? Unfortunately, Version 28 of the SSC library does not report the hourly inverter efficiency. (The next version will, but you'll have to wait a few weeks for us to release it.) However, in Version 28, you could calculate the inverter efficiency using the hourly_dc_net and hourly_ac_gross output variables (inverter input kWh and output kWh, respectively).
Best regards,
Paul.