How can I design a clean system using 120 v generator, battery back UPS, and a reversed transformer to get a clean stable 220v with 30 amps?
First you find find your transformer in the table on page 225:

Then, you look at the column headers:

For the column &quot;Elec Conn*&quot; (electrical connection,) your transformer has &quot;16.&quot;
You refer to electrical connection diagram number 16 on page 230:

&quot;Running a transformer in reverse&quot; means you swap the primary and secondary sides.
You wire it just like if you were going to use it normally, but you provide power on the secondary instead of the primary.
In your case, you want the primary to be 240V and the secondary to be 120V.
You wire H1 to H3, then H2 to H4.
Your 240V comes out of H1 and H4.
You wire X1 to X3 then X2 to X4.
You connect your 120V from the generator to X1 and X4.

If diagram 16 doesn't match your transformer, then you have a different model than you've named.  Make sure you have the correct transformer model and the correct electrical connection diagram.
Go by the model number marked on the transformer, not by what the seller told you on e-bay.
If the transformer isn't marked, ask the manufacturer how you can properly identify which tranformer you have