Mr. Edit - these guys here already know that I am next too zero help. But I doesn't stop me from trying.
If solar is your choice of aeration system, answer this question first, as it will dictate which design road you will travel:
Do you require aeration at night or require longer than 6hrs of run time per day to maintain the proper level of DO in your BOW? If so, your system will be required to contain batteries. How many, or more specifically the total number of amp*hrs will depend on pump selection, daily run times, and the size of your array (#of panels). Batteries open up pump options and variable system run times. IMHO, this is the most expensive option but the most proven and probably the most reliable.
If you answer NO to question 1, you could use 12V or 24V direct pumping.
Your next question will probably be... How do I know if I need aeration at night or more than 6hrs of run time / day? I can't answer that (Texas vs MN) but I would bet pond guys in your region could.
