Now more and more advanced technology, there are solar energy monitor something like this, but I think if I know there are solar energy monitor, I don’t need to buy so many other things, my friends say you should consider your own needs in the end what things when shopping, so you will have the goal, also won’t have so many unnecessary things, I think my friend said is right, but I still think, if you really need to do so, then you will want to understand what what is going on, then you will know how to deal with, most of the time you have to understand what we want is not so simple.