For the grid side, Set yourself up a 240V outlet. They don't seem to care if its an officially inspected 240V circuit, or just a temporary attachment point for testing purposes. An L14-20R outlet attached to the grid with an L14-20P on the end of a piece of trunk cable will do the trick. Just terminate the loose end of trunk cable with an appropriate insulating cover on the four wires. (it doesn't have to be a branch terminator, four wire nuts will work nicely, for testing purposes)
At that point, push 16-30V DC in the input leads on the inverter (minding the polarity designations) and see what happens after your grid connection to the inverter has been stable for 300 seconds or more. With input power (i.e. a solar panel), you should be able to see a slight up tick on current leaving the L14-20R, if the inverter is working properly.
You are correct, they look for voltage in specified range + frequency in range for >300 seconds before they will presume the grid is stable enough to add power to.
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