Micro controllers allow you flexibility in your system. If you have times of extreme shade, you can install micro inverters to allow unshaded panels to work properly. They also allow you to control and monitor a single panel by itself, extremely important for maintaining the system. You can see how each panel is producing at any one time, which might tell you what section of the system is working at any one time and can tell you if a single panel is broken or malfunctioning.
One problem with micro inverters is the added cost of the hardware. You will need one for each panel (you might be able to get away with a couple for each, but you will need to check the specs of the inverter). You also have that many more items that can potentially fail.
At my company, we sell a software based micro inverter program to provide the same benefit without the potential for hardware failure. See if you can by a similar software program.
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