What solar panels, and what charge controller do I need?

Okay, so the Controller works with Gel Cells. I was wondering if having 600-900 watts of solar would excessive if the charging could never utilize that much power, but thinking of it now, that should help as the sun is rising or setting and each panel is barely coming into operation right? if I have 1 100 watt panel in low light, I would be getting a few watts out of it, but if I have 9 panels with low light, I may get closer to 100 watts out of them altogether. Is my logic correct here?