using solar panels in grow rooms

[KingOfUranus]

How about adding a couple of mini wind turbines, positioned by your intake and outakes?

 

[entremjo]

So glad I read this thread. I have been thinking this will be my next grow room experiment. I have been thinking about it for awhile. If i start off small with a few panels are they easy to add more panels down the line or am I going to have to upgrade everything?