Here is a picture of the production over the period July 16, 2015, until August 2, 2015. (Only a portion of the total array is shown to improve readability.) I have annotated the inverter type found beneath each PV module for reference:
Note that the two columns on the farthest-right edge of the garage are shaded in the early morning and the module on the bottom right on the house gets some afternoon shade. As a result, those should produce a bit less electricity than all the rest, which are in full sun. Also, the inverters third and fourth from the right in the middle row of the Garage Array are malfunctioning daily with "Grid Gone" events and therefore produce slightly less electricity.
It's a bit interesting that the old M190 in the top-left corner produced about 3% more electricity than its neighbors in that row. I attribute most of that difference to the cooling effect of the westerly winds which hit it first, but it may also be simply that the old M190 inverters tend to report more production leading up to their failure. Likely both effects are involved.
Overall, as expected, there is no real difference in production between the M190, M190IG, M215IG or M250 during the heat of the summer. It will be interesting to see if any real differences are visible during the coldest periods of the year.
FWIW, at this point, the roof arrays now contain the following:
25 - M190s (Manufactured in late 2010)
12 - M215IGs (Manufactured in early 2014)
4 - M250s (Manufactured in early 2015)
1 - M190IG (Manufactured in mid 2014)
The field array contains the following:
12 - M190s (Manufactured in late 2010)
Since the field array contains 72-cell PV modules (in a climate which gets cold enough to break the new-style inverters), I will need to keep the original-style inverters out there as long as possible. If I eventually get to the point at which I have 42 new-style inverters on the roof and I experience another failure, I may be looking to swap new-style inverters for the old M190s from someone such as Weatherman that has only 60-cell modules and/or lives in a warm climate. When and if that will eventually happen I have no idea.