When I turn my key sometimes the van wont turn over, or even click or anything.

What is your question?

I have had battery tested, plenty of power. What usually happens is I let the van sit for a while, and come back later and it will start no problem. I would leave it when I get to work, then it will start when I am off. But, when I turn it off and then try to restart, most often I get nothing. No click, no dimming of lights, just a turn and nothing. Some suggested its the Starter, but I dont know why it will start if given time. Someone said my Silonoid still works, and that this wouldnt be an alternator issue since battery charge is fine. Any ideas?