It does not work. I simulated one invereter with "2 x strings x 9 mppt" and "3 x strings x 9 mppt", in both cases not checking multi-MPPT option nor power sharing, in the 1st case give negiglible losse, in the 2nd case give huge losses. Are you suggesting to do a weighted average of the two results based on the number of MPPT inputs with 2 strings and with 3 strings? In my case, 2 strings x 7 mppt + 3 strings x 2 mppt Doing this, the weighted averaged result (obviously) "in the middle" between the 2 extreme cases. But the result of the weighted average is not equal to the result of simulation with "2 strings x 7 mmpt +3 strings x 2mppt, multi MPPT option, shared power with all Pnoms identical", but it is lower. Interestingly, it is almost exactly the straight average between the above configuration and the same, but using shared power but NOT all Pnoms identical The truth is in the middle? For sure, but it is not a satisfying answer. André, what are your suggestions?