Time to start looking at solar.

ya and its not even that easy.  everything I have been read and explained to me on solar forums and what not, points to it doesn't matter it if series or parallel the smallest panel will set the tone, in volatage for parallel, or amps in series. I have a basic understanding of why, but I do want to dive into it deeper as the understanding I have now is not enough to expain why to someone if they ask.  

I personaly have never seen this as I have always went with a single panel or identical panels and I only found this out when I asked about it on a large solar forum as I knew the sides where I can put panels were different widths.  so basicly, if you have two different sized panels the way to go is two solar controlers, if you have three different size panels then 3 solar controlers, the batteries don't care what is sending them power, as long as its the right volatage.  

Demonstration of Series and Parallel

According to this guys demonstration, if you have different size or rated panels and voltage, you will get better results in Series. Also the larger the panels in an array, The greater effect an oddball lessor panel will have. If the panels have close to the same voltage, you're better off paralleling them together. Watts isn't a measure when combining panels. Watts output is the measured result you get when testing the result of whichever combination you use. Rule is, close voltage in Parallel, and close amperage in Series. Wattage is the final result measuring voltage out times amperage out = wattage produced. Yes, batteries you want to match to the same model as the existing units. Different size batteries will discharge from Larger to smaller batteries in the connection. You especially do not mix different battery types with different ambient voltages, Lead Acid 12.6, AGM 12.8, LI 13.2.