Have an installation requiring a Fronius 10.0-1 UNI Advanced solar inverter, which calculates out to a 55A breaker. I have access to a 200A sub-panel bus fed with 100A breaker at the 200A main panel. 120% rule tells me that the sub-panel can take 200 * 1.20 - 100 = 140 amps of PV, which is ok for my 55A load. However, am I also interpreting the rule correctly in that I have to base my available capacity by the main panel bus bar / breaker rating, which would be 200 * 1.2 - 200 = 40A? So am I correct in saying that I am limited to 40A without doing a supply side tap ahead of the service.